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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/7.4/sys/nfsclient/nfs_vnops.c 214986 2010-11-08 15:22:20Z 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 static vop_advlockasync_t nfs_advlockasync; 133 134 /* 135 * Global vfs data structures for nfs 136 */ 137 struct vop_vector nfs_vnodeops = { 138 .vop_default = &default_vnodeops, 139 .vop_access = nfs_access, 140 .vop_advlock = nfs_advlock, 141 .vop_advlockasync = nfs_advlockasync, 142 .vop_close = nfs_close, 143 .vop_create = nfs_create, 144 .vop_fsync = nfs_fsync, 145 .vop_getattr = nfs_getattr, 146 .vop_getpages = nfs_getpages, 147 .vop_putpages = nfs_putpages, 148 .vop_inactive = nfs_inactive, 149 .vop_lease = VOP_NULL, 150 .vop_link = nfs_link, 151 .vop_lookup = nfs_lookup, 152 .vop_mkdir = nfs_mkdir, 153 .vop_mknod = nfs_mknod, 154 .vop_open = nfs_open, 155 .vop_print = nfs_print, 156 .vop_read = nfs_read, 157 .vop_readdir = nfs_readdir, 158 .vop_readlink = nfs_readlink, 159 .vop_reclaim = nfs_reclaim, 160 .vop_remove = nfs_remove, 161 .vop_rename = nfs_rename, 162 .vop_rmdir = nfs_rmdir, 163 .vop_setattr = nfs_setattr, 164 .vop_strategy = nfs_strategy, 165 .vop_symlink = nfs_symlink, 166 .vop_write = nfs_write, 167 }; 168 169 struct vop_vector nfs_fifoops = { 170 .vop_default = &fifo_specops, 171 .vop_access = nfsspec_access, 172 .vop_close = nfsfifo_close, 173 .vop_fsync = nfs_fsync, 174 .vop_getattr = nfs_getattr, 175 .vop_inactive = nfs_inactive, 176 .vop_print = nfs_print, 177 .vop_read = nfsfifo_read, 178 .vop_reclaim = nfs_reclaim, 179 .vop_setattr = nfs_setattr, 180 .vop_write = nfsfifo_write, 181 }; 182 183 static int nfs_mknodrpc(struct vnode *dvp, struct vnode **vpp, 184 struct componentname *cnp, struct vattr *vap); 185 static int nfs_removerpc(struct vnode *dvp, const char *name, int namelen, 186 struct ucred *cred, struct thread *td); 187 static int nfs_renamerpc(struct vnode *fdvp, const char *fnameptr, 188 int fnamelen, struct vnode *tdvp, 189 const char *tnameptr, int tnamelen, 190 struct ucred *cred, struct thread *td); 191 static int nfs_renameit(struct vnode *sdvp, struct componentname *scnp, 192 struct sillyrename *sp); 193 194 /* 195 * Global variables 196 */ 197 struct mtx nfs_iod_mtx; 198 enum nfsiod_state nfs_iodwant[NFS_MAXASYNCDAEMON]; 199 struct nfsmount *nfs_iodmount[NFS_MAXASYNCDAEMON]; 200 int nfs_numasync = 0; 201 vop_advlock_t *nfs_advlock_p = nfs_dolock; 202 vop_reclaim_t *nfs_reclaim_p = NULL; 203 #define DIRHDSIZ (sizeof (struct dirent) - (MAXNAMLEN + 1)) 204 205 SYSCTL_DECL(_vfs_nfs); 206 207 static int nfsaccess_cache_timeout = NFS_MAXATTRTIMO; 208 SYSCTL_INT(_vfs_nfs, OID_AUTO, access_cache_timeout, CTLFLAG_RW, 209 &nfsaccess_cache_timeout, 0, "NFS ACCESS cache timeout"); 210 211 static int nfs_prime_access_cache = 1; 212 SYSCTL_INT(_vfs_nfs, OID_AUTO, prime_access_cache, CTLFLAG_RW, 213 &nfs_prime_access_cache, 0, 214 "Prime NFS ACCESS cache when fetching attributes"); 215 216 static int nfsv3_commit_on_close = 0; 217 SYSCTL_INT(_vfs_nfs, OID_AUTO, nfsv3_commit_on_close, CTLFLAG_RW, 218 &nfsv3_commit_on_close, 0, "write+commit on close, else only write"); 219 220 static int nfs_clean_pages_on_close = 1; 221 SYSCTL_INT(_vfs_nfs, OID_AUTO, clean_pages_on_close, CTLFLAG_RW, 222 &nfs_clean_pages_on_close, 0, "NFS clean dirty pages on close"); 223 224 int nfs_directio_enable = 0; 225 SYSCTL_INT(_vfs_nfs, OID_AUTO, nfs_directio_enable, CTLFLAG_RW, 226 &nfs_directio_enable, 0, "Enable NFS directio"); 227 228 static u_int negnametimeo = NFS_DEFAULT_NEGNAMETIMEO; 229 SYSCTL_UINT(_vfs_nfs, OID_AUTO, negative_name_timeout, CTLFLAG_RW, 230 &negnametimeo, 0, "Negative name cache entry timeout"); 231 232 /* 233 * This sysctl allows other processes to mmap a file that has been opened 234 * O_DIRECT by a process. In general, having processes mmap the file while 235 * Direct IO is in progress can lead to Data Inconsistencies. But, we allow 236 * this by default to prevent DoS attacks - to prevent a malicious user from 237 * opening up files O_DIRECT preventing other users from mmap'ing these 238 * files. "Protected" environments where stricter consistency guarantees are 239 * required can disable this knob. The process that opened the file O_DIRECT 240 * cannot mmap() the file, because mmap'ed IO on an O_DIRECT open() is not 241 * meaningful. 242 */ 243 int nfs_directio_allow_mmap = 1; 244 SYSCTL_INT(_vfs_nfs, OID_AUTO, nfs_directio_allow_mmap, CTLFLAG_RW, 245 &nfs_directio_allow_mmap, 0, "Enable mmaped IO on file with O_DIRECT opens"); 246 247 #if 0 248 SYSCTL_INT(_vfs_nfs, OID_AUTO, access_cache_hits, CTLFLAG_RD, 249 &nfsstats.accesscache_hits, 0, "NFS ACCESS cache hit count"); 250 251 SYSCTL_INT(_vfs_nfs, OID_AUTO, access_cache_misses, CTLFLAG_RD, 252 &nfsstats.accesscache_misses, 0, "NFS ACCESS cache miss count"); 253 #endif 254 255 #define NFSV3ACCESS_ALL (NFSV3ACCESS_READ | NFSV3ACCESS_MODIFY \ 256 | NFSV3ACCESS_EXTEND | NFSV3ACCESS_EXECUTE \ 257 | NFSV3ACCESS_DELETE | NFSV3ACCESS_LOOKUP) 258 259 /* 260 * SMP Locking Note : 261 * The list of locks after the description of the lock is the ordering 262 * of other locks acquired with the lock held. 263 * np->n_mtx : Protects the fields in the nfsnode. 264 VM Object Lock 265 VI_MTX (acquired indirectly) 266 * nmp->nm_mtx : Protects the fields in the nfsmount. 267 rep->r_mtx 268 * nfs_iod_mtx : Global lock, protects shared nfsiod state. 269 * nfs_reqq_mtx : Global lock, protects the nfs_reqq list. 270 nmp->nm_mtx 271 rep->r_mtx 272 * rep->r_mtx : Protects the fields in an nfsreq. 273 */ 274 275 static int 276 nfs3_access_otw(struct vnode *vp, int wmode, struct thread *td, 277 struct ucred *cred) 278 { 279 const int v3 = 1; 280 u_int32_t *tl; 281 int error = 0, attrflag; 282 283 struct mbuf *mreq, *mrep, *md, *mb; 284 caddr_t bpos, dpos; 285 u_int32_t rmode; 286 struct nfsnode *np = VTONFS(vp); 287 288 nfsstats.rpccnt[NFSPROC_ACCESS]++; 289 mreq = nfsm_reqhead(vp, NFSPROC_ACCESS, NFSX_FH(v3) + NFSX_UNSIGNED); 290 mb = mreq; 291 bpos = mtod(mb, caddr_t); 292 nfsm_fhtom(vp, v3); 293 tl = nfsm_build(u_int32_t *, NFSX_UNSIGNED); 294 *tl = txdr_unsigned(wmode); 295 nfsm_request(vp, NFSPROC_ACCESS, td, cred); 296 nfsm_postop_attr(vp, attrflag); 297 if (!error) { 298 tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED); 299 rmode = fxdr_unsigned(u_int32_t, *tl); 300 mtx_lock(&np->n_mtx); 301 np->n_mode = rmode; 302 np->n_modeuid = cred->cr_uid; 303 np->n_modestamp = time_second; 304 mtx_unlock(&np->n_mtx); 305 } 306 m_freem(mrep); 307 nfsmout: 308 return (error); 309 } 310 311 /* 312 * nfs access vnode op. 313 * For nfs version 2, just return ok. File accesses may fail later. 314 * For nfs version 3, use the access rpc to check accessibility. If file modes 315 * are changed on the server, accesses might still fail later. 316 */ 317 static int 318 nfs_access(struct vop_access_args *ap) 319 { 320 struct vnode *vp = ap->a_vp; 321 int error = 0; 322 u_int32_t mode, wmode; 323 int v3 = NFS_ISV3(vp); 324 struct nfsnode *np = VTONFS(vp); 325 326 /* 327 * Disallow write attempts on filesystems mounted read-only; 328 * unless the file is a socket, fifo, or a block or character 329 * device resident on the filesystem. 330 */ 331 if ((ap->a_mode & VWRITE) && (vp->v_mount->mnt_flag & MNT_RDONLY)) { 332 switch (vp->v_type) { 333 case VREG: 334 case VDIR: 335 case VLNK: 336 return (EROFS); 337 default: 338 break; 339 } 340 } 341 /* 342 * For nfs v3, check to see if we have done this recently, and if 343 * so return our cached result instead of making an ACCESS call. 344 * If not, do an access rpc, otherwise you are stuck emulating 345 * ufs_access() locally using the vattr. This may not be correct, 346 * since the server may apply other access criteria such as 347 * client uid-->server uid mapping that we do not know about. 348 */ 349 if (v3) { 350 if (ap->a_mode & VREAD) 351 mode = NFSV3ACCESS_READ; 352 else 353 mode = 0; 354 if (vp->v_type != VDIR) { 355 if (ap->a_mode & VWRITE) 356 mode |= (NFSV3ACCESS_MODIFY | NFSV3ACCESS_EXTEND); 357 if (ap->a_mode & VEXEC) 358 mode |= NFSV3ACCESS_EXECUTE; 359 } else { 360 if (ap->a_mode & VWRITE) 361 mode |= (NFSV3ACCESS_MODIFY | NFSV3ACCESS_EXTEND | 362 NFSV3ACCESS_DELETE); 363 if (ap->a_mode & VEXEC) 364 mode |= NFSV3ACCESS_LOOKUP; 365 } 366 /* XXX safety belt, only make blanket request if caching */ 367 if (nfsaccess_cache_timeout > 0) { 368 wmode = NFSV3ACCESS_READ | NFSV3ACCESS_MODIFY | 369 NFSV3ACCESS_EXTEND | NFSV3ACCESS_EXECUTE | 370 NFSV3ACCESS_DELETE | NFSV3ACCESS_LOOKUP; 371 } else { 372 wmode = mode; 373 } 374 375 /* 376 * Does our cached result allow us to give a definite yes to 377 * this request? 378 */ 379 mtx_lock(&np->n_mtx); 380 if ((time_second < (np->n_modestamp + nfsaccess_cache_timeout)) && 381 (ap->a_cred->cr_uid == np->n_modeuid) && 382 ((np->n_mode & mode) == mode)) { 383 nfsstats.accesscache_hits++; 384 } else { 385 /* 386 * Either a no, or a don't know. Go to the wire. 387 */ 388 nfsstats.accesscache_misses++; 389 mtx_unlock(&np->n_mtx); 390 error = nfs3_access_otw(vp, wmode, ap->a_td,ap->a_cred); 391 mtx_lock(&np->n_mtx); 392 if (!error) { 393 if ((np->n_mode & mode) != mode) { 394 error = EACCES; 395 } 396 } 397 } 398 mtx_unlock(&np->n_mtx); 399 return (error); 400 } else { 401 if ((error = nfsspec_access(ap)) != 0) { 402 return (error); 403 } 404 /* 405 * Attempt to prevent a mapped root from accessing a file 406 * which it shouldn't. We try to read a byte from the file 407 * if the user is root and the file is not zero length. 408 * After calling nfsspec_access, we should have the correct 409 * file size cached. 410 */ 411 mtx_lock(&np->n_mtx); 412 if (ap->a_cred->cr_uid == 0 && (ap->a_mode & VREAD) 413 && VTONFS(vp)->n_size > 0) { 414 struct iovec aiov; 415 struct uio auio; 416 char buf[1]; 417 418 mtx_unlock(&np->n_mtx); 419 aiov.iov_base = buf; 420 aiov.iov_len = 1; 421 auio.uio_iov = &aiov; 422 auio.uio_iovcnt = 1; 423 auio.uio_offset = 0; 424 auio.uio_resid = 1; 425 auio.uio_segflg = UIO_SYSSPACE; 426 auio.uio_rw = UIO_READ; 427 auio.uio_td = ap->a_td; 428 429 if (vp->v_type == VREG) 430 error = nfs_readrpc(vp, &auio, ap->a_cred); 431 else if (vp->v_type == VDIR) { 432 char* bp; 433 bp = malloc(NFS_DIRBLKSIZ, M_TEMP, M_WAITOK); 434 aiov.iov_base = bp; 435 aiov.iov_len = auio.uio_resid = NFS_DIRBLKSIZ; 436 error = nfs_readdirrpc(vp, &auio, ap->a_cred); 437 free(bp, M_TEMP); 438 } else if (vp->v_type == VLNK) 439 error = nfs_readlinkrpc(vp, &auio, ap->a_cred); 440 else 441 error = EACCES; 442 } else 443 mtx_unlock(&np->n_mtx); 444 return (error); 445 } 446 } 447 448 int nfs_otw_getattr_avoid = 0; 449 450 /* 451 * nfs open vnode op 452 * Check to see if the type is ok 453 * and that deletion is not in progress. 454 * For paged in text files, you will need to flush the page cache 455 * if consistency is lost. 456 */ 457 /* ARGSUSED */ 458 static int 459 nfs_open(struct vop_open_args *ap) 460 { 461 struct vnode *vp = ap->a_vp; 462 struct nfsnode *np = VTONFS(vp); 463 struct vattr vattr; 464 int error; 465 int fmode = ap->a_mode; 466 467 if (vp->v_type != VREG && vp->v_type != VDIR && vp->v_type != VLNK) 468 return (EOPNOTSUPP); 469 470 /* 471 * Get a valid lease. If cached data is stale, flush it. 472 */ 473 mtx_lock(&np->n_mtx); 474 if (np->n_flag & NMODIFIED) { 475 mtx_unlock(&np->n_mtx); 476 error = nfs_vinvalbuf(vp, V_SAVE, ap->a_td, 1); 477 if (error == EINTR || error == EIO) 478 return (error); 479 mtx_lock(&np->n_mtx); 480 np->n_attrstamp = 0; 481 if (vp->v_type == VDIR) 482 np->n_direofoffset = 0; 483 mtx_unlock(&np->n_mtx); 484 error = VOP_GETATTR(vp, &vattr, ap->a_cred, ap->a_td); 485 if (error) 486 return (error); 487 mtx_lock(&np->n_mtx); 488 np->n_mtime = vattr.va_mtime; 489 mtx_unlock(&np->n_mtx); 490 } else { 491 mtx_unlock(&np->n_mtx); 492 error = VOP_GETATTR(vp, &vattr, ap->a_cred, ap->a_td); 493 if (error) 494 return (error); 495 mtx_lock(&np->n_mtx); 496 if (NFS_TIMESPEC_COMPARE(&np->n_mtime, &vattr.va_mtime)) { 497 if (vp->v_type == VDIR) 498 np->n_direofoffset = 0; 499 mtx_unlock(&np->n_mtx); 500 error = nfs_vinvalbuf(vp, V_SAVE, ap->a_td, 1); 501 if (error == EINTR || error == EIO) { 502 return (error); 503 } 504 mtx_lock(&np->n_mtx); 505 np->n_mtime = vattr.va_mtime; 506 } 507 mtx_unlock(&np->n_mtx); 508 } 509 /* 510 * If the object has >= 1 O_DIRECT active opens, we disable caching. 511 */ 512 if (nfs_directio_enable && (fmode & O_DIRECT) && (vp->v_type == VREG)) { 513 if (np->n_directio_opens == 0) { 514 error = nfs_vinvalbuf(vp, V_SAVE, ap->a_td, 1); 515 if (error) 516 return (error); 517 mtx_lock(&np->n_mtx); 518 np->n_flag |= NNONCACHE; 519 mtx_unlock(&np->n_mtx); 520 } 521 np->n_directio_opens++; 522 } 523 vnode_create_vobject(vp, vattr.va_size, ap->a_td); 524 return (0); 525 } 526 527 /* 528 * nfs close vnode op 529 * What an NFS client should do upon close after writing is a debatable issue. 530 * Most NFS clients push delayed writes to the server upon close, basically for 531 * two reasons: 532 * 1 - So that any write errors may be reported back to the client process 533 * doing the close system call. By far the two most likely errors are 534 * NFSERR_NOSPC and NFSERR_DQUOT to indicate space allocation failure. 535 * 2 - To put a worst case upper bound on cache inconsistency between 536 * multiple clients for the file. 537 * There is also a consistency problem for Version 2 of the protocol w.r.t. 538 * not being able to tell if other clients are writing a file concurrently, 539 * since there is no way of knowing if the changed modify time in the reply 540 * is only due to the write for this client. 541 * (NFS Version 3 provides weak cache consistency data in the reply that 542 * should be sufficient to detect and handle this case.) 543 * 544 * The current code does the following: 545 * for NFS Version 2 - play it safe and flush/invalidate all dirty buffers 546 * for NFS Version 3 - flush dirty buffers to the server but don't invalidate 547 * or commit them (this satisfies 1 and 2 except for the 548 * case where the server crashes after this close but 549 * before the commit RPC, which is felt to be "good 550 * enough". Changing the last argument to nfs_flush() to 551 * a 1 would force a commit operation, if it is felt a 552 * commit is necessary now. 553 */ 554 /* ARGSUSED */ 555 static int 556 nfs_close(struct vop_close_args *ap) 557 { 558 struct vnode *vp = ap->a_vp; 559 struct nfsnode *np = VTONFS(vp); 560 int error = 0; 561 int fmode = ap->a_fflag; 562 563 if (vp->v_type == VREG) { 564 /* 565 * Examine and clean dirty pages, regardless of NMODIFIED. 566 * This closes a major hole in close-to-open consistency. 567 * We want to push out all dirty pages (and buffers) on 568 * close, regardless of whether they were dirtied by 569 * mmap'ed writes or via write(). 570 */ 571 if (nfs_clean_pages_on_close && vp->v_object) { 572 VM_OBJECT_LOCK(vp->v_object); 573 vm_object_page_clean(vp->v_object, 0, 0, 0); 574 VM_OBJECT_UNLOCK(vp->v_object); 575 } 576 mtx_lock(&np->n_mtx); 577 if (np->n_flag & NMODIFIED) { 578 mtx_unlock(&np->n_mtx); 579 if (NFS_ISV3(vp)) { 580 /* 581 * Under NFSv3 we have dirty buffers to dispose of. We 582 * must flush them to the NFS server. We have the option 583 * of waiting all the way through the commit rpc or just 584 * waiting for the initial write. The default is to only 585 * wait through the initial write so the data is in the 586 * server's cache, which is roughly similar to the state 587 * a standard disk subsystem leaves the file in on close(). 588 * 589 * We cannot clear the NMODIFIED bit in np->n_flag due to 590 * potential races with other processes, and certainly 591 * cannot clear it if we don't commit. 592 */ 593 int cm = nfsv3_commit_on_close ? 1 : 0; 594 error = nfs_flush(vp, MNT_WAIT, ap->a_td, cm); 595 /* np->n_flag &= ~NMODIFIED; */ 596 } else 597 error = nfs_vinvalbuf(vp, V_SAVE, ap->a_td, 1); 598 mtx_lock(&np->n_mtx); 599 } 600 if (np->n_flag & NWRITEERR) { 601 np->n_flag &= ~NWRITEERR; 602 error = np->n_error; 603 } 604 mtx_unlock(&np->n_mtx); 605 } 606 if (nfs_directio_enable) 607 KASSERT((np->n_directio_asyncwr == 0), 608 ("nfs_close: dirty unflushed (%d) directio buffers\n", 609 np->n_directio_asyncwr)); 610 if (nfs_directio_enable && (fmode & O_DIRECT) && (vp->v_type == VREG)) { 611 mtx_lock(&np->n_mtx); 612 KASSERT((np->n_directio_opens > 0), 613 ("nfs_close: unexpectedly value (0) of n_directio_opens\n")); 614 np->n_directio_opens--; 615 if (np->n_directio_opens == 0) 616 np->n_flag &= ~NNONCACHE; 617 mtx_unlock(&np->n_mtx); 618 } 619 return (error); 620 } 621 622 /* 623 * nfs getattr call from vfs. 624 */ 625 static int 626 nfs_getattr(struct vop_getattr_args *ap) 627 { 628 struct vnode *vp = ap->a_vp; 629 struct nfsnode *np = VTONFS(vp); 630 struct vattr *vap = ap->a_vap; 631 struct vattr vattr; 632 caddr_t bpos, dpos; 633 int error = 0; 634 struct mbuf *mreq, *mrep, *md, *mb; 635 int v3 = NFS_ISV3(vp); 636 637 /* 638 * Update local times for special files. 639 */ 640 mtx_lock(&np->n_mtx); 641 if (np->n_flag & (NACC | NUPD)) 642 np->n_flag |= NCHG; 643 mtx_unlock(&np->n_mtx); 644 /* 645 * First look in the cache. 646 */ 647 if (nfs_getattrcache(vp, &vattr) == 0) 648 goto nfsmout; 649 if (v3 && nfs_prime_access_cache && nfsaccess_cache_timeout > 0) { 650 nfsstats.accesscache_misses++; 651 nfs3_access_otw(vp, NFSV3ACCESS_ALL, ap->a_td, ap->a_cred); 652 if (nfs_getattrcache(vp, &vattr) == 0) 653 goto nfsmout; 654 } 655 nfsstats.rpccnt[NFSPROC_GETATTR]++; 656 mreq = nfsm_reqhead(vp, NFSPROC_GETATTR, NFSX_FH(v3)); 657 mb = mreq; 658 bpos = mtod(mb, caddr_t); 659 nfsm_fhtom(vp, v3); 660 nfsm_request(vp, NFSPROC_GETATTR, ap->a_td, ap->a_cred); 661 if (!error) { 662 nfsm_loadattr(vp, &vattr); 663 } 664 m_freem(mrep); 665 nfsmout: 666 vap->va_type = vattr.va_type; 667 vap->va_mode = vattr.va_mode; 668 vap->va_nlink = vattr.va_nlink; 669 vap->va_uid = vattr.va_uid; 670 vap->va_gid = vattr.va_gid; 671 vap->va_fsid = vattr.va_fsid; 672 vap->va_fileid = vattr.va_fileid; 673 vap->va_size = vattr.va_size; 674 vap->va_blocksize = vattr.va_blocksize; 675 vap->va_atime = vattr.va_atime; 676 vap->va_mtime = vattr.va_mtime; 677 vap->va_ctime = vattr.va_ctime; 678 vap->va_gen = vattr.va_gen; 679 vap->va_flags = vattr.va_flags; 680 vap->va_rdev = vattr.va_rdev; 681 vap->va_bytes = vattr.va_bytes; 682 vap->va_filerev = vattr.va_filerev; 683 684 return (error); 685 } 686 687 /* 688 * nfs setattr call. 689 */ 690 static int 691 nfs_setattr(struct vop_setattr_args *ap) 692 { 693 struct vnode *vp = ap->a_vp; 694 struct nfsnode *np = VTONFS(vp); 695 struct vattr *vap = ap->a_vap; 696 int error = 0; 697 u_quad_t tsize; 698 699 #ifndef nolint 700 tsize = (u_quad_t)0; 701 #endif 702 703 /* 704 * Setting of flags and marking of atimes are not supported. 705 */ 706 if (vap->va_flags != VNOVAL || (vap->va_vaflags & VA_MARK_ATIME)) 707 return (EOPNOTSUPP); 708 709 /* 710 * Disallow write attempts if the filesystem is mounted read-only. 711 */ 712 if ((vap->va_flags != VNOVAL || vap->va_uid != (uid_t)VNOVAL || 713 vap->va_gid != (gid_t)VNOVAL || vap->va_atime.tv_sec != VNOVAL || 714 vap->va_mtime.tv_sec != VNOVAL || vap->va_mode != (mode_t)VNOVAL) && 715 (vp->v_mount->mnt_flag & MNT_RDONLY)) { 716 error = EROFS; 717 goto out; 718 } 719 if (vap->va_size != VNOVAL) { 720 switch (vp->v_type) { 721 case VDIR: 722 return (EISDIR); 723 case VCHR: 724 case VBLK: 725 case VSOCK: 726 case VFIFO: 727 if (vap->va_mtime.tv_sec == VNOVAL && 728 vap->va_atime.tv_sec == VNOVAL && 729 vap->va_mode == (mode_t)VNOVAL && 730 vap->va_uid == (uid_t)VNOVAL && 731 vap->va_gid == (gid_t)VNOVAL) 732 return (0); 733 vap->va_size = VNOVAL; 734 break; 735 default: 736 /* 737 * Disallow write attempts if the filesystem is 738 * mounted read-only. 739 */ 740 if (vp->v_mount->mnt_flag & MNT_RDONLY) 741 return (EROFS); 742 /* 743 * We run vnode_pager_setsize() early (why?), 744 * we must set np->n_size now to avoid vinvalbuf 745 * V_SAVE races that might setsize a lower 746 * value. 747 */ 748 mtx_lock(&np->n_mtx); 749 tsize = np->n_size; 750 mtx_unlock(&np->n_mtx); 751 error = nfs_meta_setsize(vp, ap->a_cred, 752 ap->a_td, vap->va_size); 753 mtx_lock(&np->n_mtx); 754 if (np->n_flag & NMODIFIED) { 755 tsize = np->n_size; 756 mtx_unlock(&np->n_mtx); 757 if (vap->va_size == 0) 758 error = nfs_vinvalbuf(vp, 0, ap->a_td, 1); 759 else 760 error = nfs_vinvalbuf(vp, V_SAVE, ap->a_td, 1); 761 if (error) { 762 vnode_pager_setsize(vp, tsize); 763 goto out; 764 } 765 } else 766 mtx_unlock(&np->n_mtx); 767 /* 768 * np->n_size has already been set to vap->va_size 769 * in nfs_meta_setsize(). We must set it again since 770 * nfs_loadattrcache() could be called through 771 * nfs_meta_setsize() and could modify np->n_size. 772 */ 773 mtx_lock(&np->n_mtx); 774 np->n_vattr.va_size = np->n_size = vap->va_size; 775 mtx_unlock(&np->n_mtx); 776 }; 777 } else { 778 mtx_lock(&np->n_mtx); 779 if ((vap->va_mtime.tv_sec != VNOVAL || vap->va_atime.tv_sec != VNOVAL) && 780 (np->n_flag & NMODIFIED) && vp->v_type == VREG) { 781 mtx_unlock(&np->n_mtx); 782 if ((error = nfs_vinvalbuf(vp, V_SAVE, ap->a_td, 1)) != 0 && 783 (error == EINTR || error == EIO)) 784 return error; 785 } else 786 mtx_unlock(&np->n_mtx); 787 } 788 error = nfs_setattrrpc(vp, vap, ap->a_cred, ap->a_td); 789 if (error && vap->va_size != VNOVAL) { 790 mtx_lock(&np->n_mtx); 791 np->n_size = np->n_vattr.va_size = tsize; 792 vnode_pager_setsize(vp, tsize); 793 mtx_unlock(&np->n_mtx); 794 } 795 out: 796 return (error); 797 } 798 799 /* 800 * Do an nfs setattr rpc. 801 */ 802 static int 803 nfs_setattrrpc(struct vnode *vp, struct vattr *vap, struct ucred *cred, 804 struct thread *td) 805 { 806 struct nfsv2_sattr *sp; 807 struct nfsnode *np = VTONFS(vp); 808 caddr_t bpos, dpos; 809 u_int32_t *tl; 810 int error = 0, wccflag = NFSV3_WCCRATTR; 811 struct mbuf *mreq, *mrep, *md, *mb; 812 int v3 = NFS_ISV3(vp); 813 814 nfsstats.rpccnt[NFSPROC_SETATTR]++; 815 mreq = nfsm_reqhead(vp, NFSPROC_SETATTR, NFSX_FH(v3) + NFSX_SATTR(v3)); 816 mb = mreq; 817 bpos = mtod(mb, caddr_t); 818 nfsm_fhtom(vp, v3); 819 if (v3) { 820 nfsm_v3attrbuild(vap, TRUE); 821 tl = nfsm_build(u_int32_t *, NFSX_UNSIGNED); 822 *tl = nfs_false; 823 } else { 824 sp = nfsm_build(struct nfsv2_sattr *, NFSX_V2SATTR); 825 if (vap->va_mode == (mode_t)VNOVAL) 826 sp->sa_mode = nfs_xdrneg1; 827 else 828 sp->sa_mode = vtonfsv2_mode(vp->v_type, vap->va_mode); 829 if (vap->va_uid == (uid_t)VNOVAL) 830 sp->sa_uid = nfs_xdrneg1; 831 else 832 sp->sa_uid = txdr_unsigned(vap->va_uid); 833 if (vap->va_gid == (gid_t)VNOVAL) 834 sp->sa_gid = nfs_xdrneg1; 835 else 836 sp->sa_gid = txdr_unsigned(vap->va_gid); 837 sp->sa_size = txdr_unsigned(vap->va_size); 838 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime); 839 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime); 840 } 841 nfsm_request(vp, NFSPROC_SETATTR, td, cred); 842 if (v3) { 843 np->n_modestamp = 0; 844 nfsm_wcc_data(vp, wccflag); 845 } else 846 nfsm_loadattr(vp, NULL); 847 m_freem(mrep); 848 nfsmout: 849 return (error); 850 } 851 852 /* 853 * nfs lookup call, one step at a time... 854 * First look in cache 855 * If not found, unlock the directory nfsnode and do the rpc 856 */ 857 static int 858 nfs_lookup(struct vop_lookup_args *ap) 859 { 860 struct componentname *cnp = ap->a_cnp; 861 struct vnode *dvp = ap->a_dvp; 862 struct vnode **vpp = ap->a_vpp; 863 struct vattr vattr; 864 struct timespec dmtime; 865 int flags = cnp->cn_flags; 866 struct vnode *newvp; 867 struct nfsmount *nmp; 868 caddr_t bpos, dpos; 869 struct mbuf *mreq, *mrep, *md, *mb; 870 long len; 871 nfsfh_t *fhp; 872 struct nfsnode *np, *newnp; 873 int error = 0, attrflag, fhsize; 874 int v3 = NFS_ISV3(dvp); 875 struct thread *td = cnp->cn_thread; 876 877 *vpp = NULLVP; 878 if ((flags & ISLASTCN) && (dvp->v_mount->mnt_flag & MNT_RDONLY) && 879 (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME)) 880 return (EROFS); 881 if (dvp->v_type != VDIR) 882 return (ENOTDIR); 883 nmp = VFSTONFS(dvp->v_mount); 884 np = VTONFS(dvp); 885 if ((error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred, td)) != 0) { 886 *vpp = NULLVP; 887 return (error); 888 } 889 error = cache_lookup(dvp, vpp, cnp); 890 if (error > 0 && error != ENOENT) 891 return (error); 892 if (error == -1) { 893 /* 894 * We only accept a positive hit in the cache if the 895 * change time of the file matches our cached copy. 896 * Otherwise, we discard the cache entry and fallback 897 * to doing a lookup RPC. 898 * 899 * To better handle stale file handles and attributes, 900 * clear the attribute cache of this node if it is a 901 * leaf component, part of an open() call, and not 902 * locally modified before fetching the attributes. 903 * This should allow stale file handles to be detected 904 * here where we can fall back to a LOOKUP RPC to 905 * recover rather than having nfs_open() detect the 906 * stale file handle and failing open(2) with ESTALE. 907 */ 908 newvp = *vpp; 909 newnp = VTONFS(newvp); 910 if ((flags & (ISLASTCN | ISOPEN)) == (ISLASTCN | ISOPEN) && 911 !(newnp->n_flag & NMODIFIED)) { 912 mtx_lock(&newnp->n_mtx); 913 newnp->n_attrstamp = 0; 914 mtx_unlock(&newnp->n_mtx); 915 } 916 if (VOP_GETATTR(newvp, &vattr, cnp->cn_cred, td) == 0 && 917 timespeccmp(&vattr.va_ctime, &newnp->n_ctime, ==)) { 918 nfsstats.lookupcache_hits++; 919 if (cnp->cn_nameiop != LOOKUP && 920 (flags & ISLASTCN)) 921 cnp->cn_flags |= SAVENAME; 922 return (0); 923 } 924 cache_purge(newvp); 925 if (dvp != newvp) 926 vput(newvp); 927 else 928 vrele(newvp); 929 *vpp = NULLVP; 930 } else if (error == ENOENT) { 931 /* 932 * We only accept a negative hit in the cache if the 933 * modification time of the parent directory matches 934 * our cached copy. Otherwise, we discard all of the 935 * negative cache entries for this directory. We also 936 * only trust -ve cache entries for less than 937 * negnametimeo seconds. 938 */ 939 if ((u_int)(ticks - np->n_dmtime_ticks) < (negnametimeo * hz) && 940 VOP_GETATTR(dvp, &vattr, cnp->cn_cred, td) == 0 && 941 timespeccmp(&vattr.va_mtime, &np->n_dmtime, ==)) { 942 nfsstats.lookupcache_hits++; 943 return (ENOENT); 944 } 945 cache_purge_negative(dvp); 946 mtx_lock(&np->n_mtx); 947 timespecclear(&np->n_dmtime); 948 mtx_unlock(&np->n_mtx); 949 } 950 951 /* 952 * Cache the modification time of the parent directory in case 953 * the lookup fails and results in adding the first negative 954 * name cache entry for the directory. Since this is reading 955 * a single time_t, don't bother with locking. The 956 * modification time may be a bit stale, but it must be read 957 * before performing the lookup RPC to prevent a race where 958 * another lookup updates the timestamp on the directory after 959 * the lookup RPC has been performed on the server but before 960 * n_dmtime is set at the end of this function. 961 */ 962 dmtime = np->n_vattr.va_mtime; 963 error = 0; 964 newvp = NULLVP; 965 nfsstats.lookupcache_misses++; 966 nfsstats.rpccnt[NFSPROC_LOOKUP]++; 967 len = cnp->cn_namelen; 968 mreq = nfsm_reqhead(dvp, NFSPROC_LOOKUP, 969 NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(len)); 970 mb = mreq; 971 bpos = mtod(mb, caddr_t); 972 nfsm_fhtom(dvp, v3); 973 nfsm_strtom(cnp->cn_nameptr, len, NFS_MAXNAMLEN); 974 nfsm_request(dvp, NFSPROC_LOOKUP, cnp->cn_thread, cnp->cn_cred); 975 if (error) { 976 if (v3) { 977 nfsm_postop_attr(dvp, attrflag); 978 m_freem(mrep); 979 } 980 goto nfsmout; 981 } 982 nfsm_getfh(fhp, fhsize, v3); 983 984 /* 985 * Handle RENAME case... 986 */ 987 if (cnp->cn_nameiop == RENAME && (flags & ISLASTCN)) { 988 if (NFS_CMPFH(np, fhp, fhsize)) { 989 m_freem(mrep); 990 return (EISDIR); 991 } 992 error = nfs_nget(dvp->v_mount, fhp, fhsize, &np, LK_EXCLUSIVE); 993 if (error) { 994 m_freem(mrep); 995 return (error); 996 } 997 newvp = NFSTOV(np); 998 if (v3) { 999 nfsm_postop_attr(newvp, attrflag); 1000 nfsm_postop_attr(dvp, attrflag); 1001 } else 1002 nfsm_loadattr(newvp, NULL); 1003 *vpp = newvp; 1004 m_freem(mrep); 1005 cnp->cn_flags |= SAVENAME; 1006 return (0); 1007 } 1008 1009 if (flags & ISDOTDOT) { 1010 VOP_UNLOCK(dvp, 0, td); 1011 error = nfs_nget(dvp->v_mount, fhp, fhsize, &np, cnp->cn_lkflags); 1012 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY, td); 1013 if (error) 1014 return (error); 1015 newvp = NFSTOV(np); 1016 } else if (NFS_CMPFH(np, fhp, fhsize)) { 1017 VREF(dvp); 1018 newvp = dvp; 1019 } else { 1020 error = nfs_nget(dvp->v_mount, fhp, fhsize, &np, cnp->cn_lkflags); 1021 if (error) { 1022 m_freem(mrep); 1023 return (error); 1024 } 1025 newvp = NFSTOV(np); 1026 1027 /* 1028 * Flush the attribute cache when opening a leaf node 1029 * to ensure that fresh attributes are fetched in 1030 * nfs_open() if we are unable to fetch attributes 1031 * from the LOOKUP reply. 1032 */ 1033 if ((flags & (ISLASTCN | ISOPEN)) == (ISLASTCN | ISOPEN) && 1034 !(np->n_flag & NMODIFIED)) { 1035 mtx_lock(&np->n_mtx); 1036 np->n_attrstamp = 0; 1037 mtx_unlock(&np->n_mtx); 1038 } 1039 } 1040 if (v3) { 1041 nfsm_postop_attr(newvp, attrflag); 1042 nfsm_postop_attr(dvp, attrflag); 1043 } else 1044 nfsm_loadattr(newvp, NULL); 1045 if (cnp->cn_nameiop != LOOKUP && (flags & ISLASTCN)) 1046 cnp->cn_flags |= SAVENAME; 1047 if ((cnp->cn_flags & MAKEENTRY) && 1048 (cnp->cn_nameiop != DELETE || !(flags & ISLASTCN))) { 1049 np->n_ctime = np->n_vattr.va_ctime; 1050 cache_enter(dvp, newvp, cnp); 1051 } 1052 *vpp = newvp; 1053 m_freem(mrep); 1054 nfsmout: 1055 if (error) { 1056 if (newvp != NULLVP) { 1057 vput(newvp); 1058 *vpp = NULLVP; 1059 } 1060 1061 if (error != ENOENT) 1062 goto done; 1063 1064 /* The requested file was not found. */ 1065 if ((cnp->cn_nameiop == CREATE || cnp->cn_nameiop == RENAME) && 1066 (flags & ISLASTCN)) { 1067 /* 1068 * XXX: UFS does a full VOP_ACCESS(dvp, 1069 * VWRITE) here instead of just checking 1070 * MNT_RDONLY. 1071 */ 1072 if (dvp->v_mount->mnt_flag & MNT_RDONLY) 1073 return (EROFS); 1074 cnp->cn_flags |= SAVENAME; 1075 return (EJUSTRETURN); 1076 } 1077 1078 if ((cnp->cn_flags & MAKEENTRY) && cnp->cn_nameiop != CREATE) { 1079 /* 1080 * Maintain n_dmtime as the modification time 1081 * of the parent directory when the oldest -ve 1082 * name cache entry for this directory was 1083 * added. If a -ve cache entry has already 1084 * been added with a newer modification time 1085 * by a concurrent lookup, then don't bother 1086 * adding a cache entry. The modification 1087 * time of the directory might have changed 1088 * due to the file this lookup failed to find 1089 * being created. In that case a subsequent 1090 * lookup would incorrectly use the entry 1091 * added here instead of doing an extra 1092 * lookup. 1093 */ 1094 mtx_lock(&np->n_mtx); 1095 if (timespeccmp(&np->n_dmtime, &dmtime, <=)) { 1096 if (!timespecisset(&np->n_dmtime)) { 1097 np->n_dmtime = dmtime; 1098 np->n_dmtime_ticks = ticks; 1099 } 1100 mtx_unlock(&np->n_mtx); 1101 cache_enter(dvp, NULL, cnp); 1102 } else 1103 mtx_unlock(&np->n_mtx); 1104 } 1105 return (ENOENT); 1106 } 1107 done: 1108 return (error); 1109 } 1110 1111 /* 1112 * nfs read call. 1113 * Just call nfs_bioread() to do the work. 1114 */ 1115 static int 1116 nfs_read(struct vop_read_args *ap) 1117 { 1118 struct vnode *vp = ap->a_vp; 1119 1120 switch (vp->v_type) { 1121 case VREG: 1122 return (nfs_bioread(vp, ap->a_uio, ap->a_ioflag, ap->a_cred)); 1123 case VDIR: 1124 return (EISDIR); 1125 default: 1126 return (EOPNOTSUPP); 1127 } 1128 } 1129 1130 /* 1131 * nfs readlink call 1132 */ 1133 static int 1134 nfs_readlink(struct vop_readlink_args *ap) 1135 { 1136 struct vnode *vp = ap->a_vp; 1137 1138 if (vp->v_type != VLNK) 1139 return (EINVAL); 1140 return (nfs_bioread(vp, ap->a_uio, 0, ap->a_cred)); 1141 } 1142 1143 /* 1144 * Do a readlink rpc. 1145 * Called by nfs_doio() from below the buffer cache. 1146 */ 1147 int 1148 nfs_readlinkrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred) 1149 { 1150 caddr_t bpos, dpos; 1151 int error = 0, len, attrflag; 1152 struct mbuf *mreq, *mrep, *md, *mb; 1153 int v3 = NFS_ISV3(vp); 1154 1155 nfsstats.rpccnt[NFSPROC_READLINK]++; 1156 mreq = nfsm_reqhead(vp, NFSPROC_READLINK, NFSX_FH(v3)); 1157 mb = mreq; 1158 bpos = mtod(mb, caddr_t); 1159 nfsm_fhtom(vp, v3); 1160 nfsm_request(vp, NFSPROC_READLINK, uiop->uio_td, cred); 1161 if (v3) 1162 nfsm_postop_attr(vp, attrflag); 1163 if (!error) { 1164 nfsm_strsiz(len, NFS_MAXPATHLEN); 1165 if (len == NFS_MAXPATHLEN) { 1166 struct nfsnode *np = VTONFS(vp); 1167 mtx_lock(&np->n_mtx); 1168 if (np->n_size && np->n_size < NFS_MAXPATHLEN) 1169 len = np->n_size; 1170 mtx_unlock(&np->n_mtx); 1171 } 1172 nfsm_mtouio(uiop, len); 1173 } 1174 m_freem(mrep); 1175 nfsmout: 1176 return (error); 1177 } 1178 1179 /* 1180 * nfs read rpc call 1181 * Ditto above 1182 */ 1183 int 1184 nfs_readrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred) 1185 { 1186 u_int32_t *tl; 1187 caddr_t bpos, dpos; 1188 struct mbuf *mreq, *mrep, *md, *mb; 1189 struct nfsmount *nmp; 1190 int error = 0, len, retlen, tsiz, eof, attrflag; 1191 int v3 = NFS_ISV3(vp); 1192 int rsize; 1193 1194 #ifndef nolint 1195 eof = 0; 1196 #endif 1197 nmp = VFSTONFS(vp->v_mount); 1198 tsiz = uiop->uio_resid; 1199 mtx_lock(&nmp->nm_mtx); 1200 if (uiop->uio_offset + tsiz > nmp->nm_maxfilesize) { 1201 mtx_unlock(&nmp->nm_mtx); 1202 return (EFBIG); 1203 } 1204 rsize = nmp->nm_rsize; 1205 mtx_unlock(&nmp->nm_mtx); 1206 while (tsiz > 0) { 1207 nfsstats.rpccnt[NFSPROC_READ]++; 1208 len = (tsiz > rsize) ? rsize : tsiz; 1209 mreq = nfsm_reqhead(vp, NFSPROC_READ, NFSX_FH(v3) + NFSX_UNSIGNED * 3); 1210 mb = mreq; 1211 bpos = mtod(mb, caddr_t); 1212 nfsm_fhtom(vp, v3); 1213 tl = nfsm_build(u_int32_t *, NFSX_UNSIGNED * 3); 1214 if (v3) { 1215 txdr_hyper(uiop->uio_offset, tl); 1216 *(tl + 2) = txdr_unsigned(len); 1217 } else { 1218 *tl++ = txdr_unsigned(uiop->uio_offset); 1219 *tl++ = txdr_unsigned(len); 1220 *tl = 0; 1221 } 1222 nfsm_request(vp, NFSPROC_READ, uiop->uio_td, cred); 1223 if (v3) { 1224 nfsm_postop_attr(vp, attrflag); 1225 if (error) { 1226 m_freem(mrep); 1227 goto nfsmout; 1228 } 1229 tl = nfsm_dissect(u_int32_t *, 2 * NFSX_UNSIGNED); 1230 eof = fxdr_unsigned(int, *(tl + 1)); 1231 } else { 1232 nfsm_loadattr(vp, NULL); 1233 } 1234 nfsm_strsiz(retlen, rsize); 1235 nfsm_mtouio(uiop, retlen); 1236 m_freem(mrep); 1237 tsiz -= retlen; 1238 if (v3) { 1239 if (eof || retlen == 0) { 1240 tsiz = 0; 1241 } 1242 } else if (retlen < len) { 1243 tsiz = 0; 1244 } 1245 } 1246 nfsmout: 1247 return (error); 1248 } 1249 1250 /* 1251 * nfs write call 1252 */ 1253 int 1254 nfs_writerpc(struct vnode *vp, struct uio *uiop, struct ucred *cred, 1255 int *iomode, int *must_commit) 1256 { 1257 u_int32_t *tl; 1258 int32_t backup; 1259 caddr_t bpos, dpos; 1260 struct mbuf *mreq, *mrep, *md, *mb; 1261 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 1262 int error = 0, len, tsiz, wccflag = NFSV3_WCCRATTR, rlen, commit; 1263 int v3 = NFS_ISV3(vp), committed = NFSV3WRITE_FILESYNC; 1264 int wsize; 1265 1266 #ifndef DIAGNOSTIC 1267 if (uiop->uio_iovcnt != 1) 1268 panic("nfs: writerpc iovcnt > 1"); 1269 #endif 1270 *must_commit = 0; 1271 tsiz = uiop->uio_resid; 1272 mtx_lock(&nmp->nm_mtx); 1273 if (uiop->uio_offset + tsiz > nmp->nm_maxfilesize) { 1274 mtx_unlock(&nmp->nm_mtx); 1275 return (EFBIG); 1276 } 1277 wsize = nmp->nm_wsize; 1278 mtx_unlock(&nmp->nm_mtx); 1279 while (tsiz > 0) { 1280 nfsstats.rpccnt[NFSPROC_WRITE]++; 1281 len = (tsiz > wsize) ? wsize : tsiz; 1282 mreq = nfsm_reqhead(vp, NFSPROC_WRITE, 1283 NFSX_FH(v3) + 5 * NFSX_UNSIGNED + nfsm_rndup(len)); 1284 mb = mreq; 1285 bpos = mtod(mb, caddr_t); 1286 nfsm_fhtom(vp, v3); 1287 if (v3) { 1288 tl = nfsm_build(u_int32_t *, 5 * NFSX_UNSIGNED); 1289 txdr_hyper(uiop->uio_offset, tl); 1290 tl += 2; 1291 *tl++ = txdr_unsigned(len); 1292 *tl++ = txdr_unsigned(*iomode); 1293 *tl = txdr_unsigned(len); 1294 } else { 1295 u_int32_t x; 1296 1297 tl = nfsm_build(u_int32_t *, 4 * NFSX_UNSIGNED); 1298 /* Set both "begin" and "current" to non-garbage. */ 1299 x = txdr_unsigned((u_int32_t)uiop->uio_offset); 1300 *tl++ = x; /* "begin offset" */ 1301 *tl++ = x; /* "current offset" */ 1302 x = txdr_unsigned(len); 1303 *tl++ = x; /* total to this offset */ 1304 *tl = x; /* size of this write */ 1305 } 1306 nfsm_uiotom(uiop, len); 1307 nfsm_request(vp, NFSPROC_WRITE, uiop->uio_td, cred); 1308 if (v3) { 1309 wccflag = NFSV3_WCCCHK; 1310 nfsm_wcc_data(vp, wccflag); 1311 if (!error) { 1312 tl = nfsm_dissect(u_int32_t *, 2 * NFSX_UNSIGNED 1313 + NFSX_V3WRITEVERF); 1314 rlen = fxdr_unsigned(int, *tl++); 1315 if (rlen == 0) { 1316 error = NFSERR_IO; 1317 m_freem(mrep); 1318 break; 1319 } else if (rlen < len) { 1320 backup = len - rlen; 1321 uiop->uio_iov->iov_base = 1322 (char *)uiop->uio_iov->iov_base - 1323 backup; 1324 uiop->uio_iov->iov_len += backup; 1325 uiop->uio_offset -= backup; 1326 uiop->uio_resid += backup; 1327 len = rlen; 1328 } 1329 commit = fxdr_unsigned(int, *tl++); 1330 1331 /* 1332 * Return the lowest committment level 1333 * obtained by any of the RPCs. 1334 */ 1335 if (committed == NFSV3WRITE_FILESYNC) 1336 committed = commit; 1337 else if (committed == NFSV3WRITE_DATASYNC && 1338 commit == NFSV3WRITE_UNSTABLE) 1339 committed = commit; 1340 mtx_lock(&nmp->nm_mtx); 1341 if ((nmp->nm_state & NFSSTA_HASWRITEVERF) == 0){ 1342 bcopy((caddr_t)tl, (caddr_t)nmp->nm_verf, 1343 NFSX_V3WRITEVERF); 1344 nmp->nm_state |= NFSSTA_HASWRITEVERF; 1345 } else if (bcmp((caddr_t)tl, 1346 (caddr_t)nmp->nm_verf, NFSX_V3WRITEVERF)) { 1347 *must_commit = 1; 1348 bcopy((caddr_t)tl, (caddr_t)nmp->nm_verf, 1349 NFSX_V3WRITEVERF); 1350 } 1351 mtx_unlock(&nmp->nm_mtx); 1352 } 1353 } else { 1354 nfsm_loadattr(vp, NULL); 1355 } 1356 if (wccflag) { 1357 mtx_lock(&(VTONFS(vp))->n_mtx); 1358 VTONFS(vp)->n_mtime = VTONFS(vp)->n_vattr.va_mtime; 1359 mtx_unlock(&(VTONFS(vp))->n_mtx); 1360 } 1361 m_freem(mrep); 1362 if (error) 1363 break; 1364 tsiz -= len; 1365 } 1366 nfsmout: 1367 if (vp->v_mount->mnt_kern_flag & MNTK_ASYNC) 1368 committed = NFSV3WRITE_FILESYNC; 1369 *iomode = committed; 1370 if (error) 1371 uiop->uio_resid = tsiz; 1372 return (error); 1373 } 1374 1375 /* 1376 * nfs mknod rpc 1377 * For NFS v2 this is a kludge. Use a create rpc but with the IFMT bits of the 1378 * mode set to specify the file type and the size field for rdev. 1379 */ 1380 static int 1381 nfs_mknodrpc(struct vnode *dvp, struct vnode **vpp, struct componentname *cnp, 1382 struct vattr *vap) 1383 { 1384 struct nfsv2_sattr *sp; 1385 u_int32_t *tl; 1386 struct vnode *newvp = NULL; 1387 struct nfsnode *np = NULL; 1388 struct vattr vattr; 1389 caddr_t bpos, dpos; 1390 int error = 0, wccflag = NFSV3_WCCRATTR, gotvp = 0; 1391 struct mbuf *mreq, *mrep, *md, *mb; 1392 u_int32_t rdev; 1393 int v3 = NFS_ISV3(dvp); 1394 1395 if (vap->va_type == VCHR || vap->va_type == VBLK) 1396 rdev = txdr_unsigned(vap->va_rdev); 1397 else if (vap->va_type == VFIFO || vap->va_type == VSOCK) 1398 rdev = nfs_xdrneg1; 1399 else { 1400 return (EOPNOTSUPP); 1401 } 1402 if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred, cnp->cn_thread)) != 0) { 1403 return (error); 1404 } 1405 nfsstats.rpccnt[NFSPROC_MKNOD]++; 1406 mreq = nfsm_reqhead(dvp, NFSPROC_MKNOD, NFSX_FH(v3) + 4 * NFSX_UNSIGNED + 1407 + nfsm_rndup(cnp->cn_namelen) + NFSX_SATTR(v3)); 1408 mb = mreq; 1409 bpos = mtod(mb, caddr_t); 1410 nfsm_fhtom(dvp, v3); 1411 nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN); 1412 if (v3) { 1413 tl = nfsm_build(u_int32_t *, NFSX_UNSIGNED); 1414 *tl++ = vtonfsv3_type(vap->va_type); 1415 nfsm_v3attrbuild(vap, FALSE); 1416 if (vap->va_type == VCHR || vap->va_type == VBLK) { 1417 tl = nfsm_build(u_int32_t *, 2 * NFSX_UNSIGNED); 1418 *tl++ = txdr_unsigned(umajor(vap->va_rdev)); 1419 *tl = txdr_unsigned(uminor(vap->va_rdev)); 1420 } 1421 } else { 1422 sp = nfsm_build(struct nfsv2_sattr *, NFSX_V2SATTR); 1423 sp->sa_mode = vtonfsv2_mode(vap->va_type, vap->va_mode); 1424 sp->sa_uid = nfs_xdrneg1; 1425 sp->sa_gid = nfs_xdrneg1; 1426 sp->sa_size = rdev; 1427 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime); 1428 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime); 1429 } 1430 nfsm_request(dvp, NFSPROC_MKNOD, cnp->cn_thread, cnp->cn_cred); 1431 if (!error) { 1432 nfsm_mtofh(dvp, newvp, v3, gotvp); 1433 if (!gotvp) { 1434 if (newvp) { 1435 vput(newvp); 1436 newvp = NULL; 1437 } 1438 error = nfs_lookitup(dvp, cnp->cn_nameptr, 1439 cnp->cn_namelen, cnp->cn_cred, cnp->cn_thread, &np); 1440 if (!error) 1441 newvp = NFSTOV(np); 1442 } 1443 } 1444 if (v3) 1445 nfsm_wcc_data(dvp, wccflag); 1446 m_freem(mrep); 1447 nfsmout: 1448 if (error) { 1449 if (newvp) 1450 vput(newvp); 1451 } else { 1452 if (cnp->cn_flags & MAKEENTRY) 1453 cache_enter(dvp, newvp, cnp); 1454 *vpp = newvp; 1455 } 1456 mtx_lock(&(VTONFS(dvp))->n_mtx); 1457 VTONFS(dvp)->n_flag |= NMODIFIED; 1458 if (!wccflag) 1459 VTONFS(dvp)->n_attrstamp = 0; 1460 mtx_unlock(&(VTONFS(dvp))->n_mtx); 1461 return (error); 1462 } 1463 1464 /* 1465 * nfs mknod vop 1466 * just call nfs_mknodrpc() to do the work. 1467 */ 1468 /* ARGSUSED */ 1469 static int 1470 nfs_mknod(struct vop_mknod_args *ap) 1471 { 1472 return (nfs_mknodrpc(ap->a_dvp, ap->a_vpp, ap->a_cnp, ap->a_vap)); 1473 } 1474 1475 static u_long create_verf; 1476 /* 1477 * nfs file create call 1478 */ 1479 static int 1480 nfs_create(struct vop_create_args *ap) 1481 { 1482 struct vnode *dvp = ap->a_dvp; 1483 struct vattr *vap = ap->a_vap; 1484 struct componentname *cnp = ap->a_cnp; 1485 struct nfsv2_sattr *sp; 1486 u_int32_t *tl; 1487 struct nfsnode *np = NULL; 1488 struct vnode *newvp = NULL; 1489 caddr_t bpos, dpos; 1490 int error = 0, wccflag = NFSV3_WCCRATTR, gotvp = 0, fmode = 0; 1491 struct mbuf *mreq, *mrep, *md, *mb; 1492 struct vattr vattr; 1493 int v3 = NFS_ISV3(dvp); 1494 1495 /* 1496 * Oops, not for me.. 1497 */ 1498 if (vap->va_type == VSOCK) 1499 return (nfs_mknodrpc(dvp, ap->a_vpp, cnp, vap)); 1500 1501 if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred, cnp->cn_thread)) != 0) { 1502 return (error); 1503 } 1504 if (vap->va_vaflags & VA_EXCLUSIVE) 1505 fmode |= O_EXCL; 1506 again: 1507 nfsstats.rpccnt[NFSPROC_CREATE]++; 1508 mreq = nfsm_reqhead(dvp, NFSPROC_CREATE, NFSX_FH(v3) + 2 * NFSX_UNSIGNED + 1509 nfsm_rndup(cnp->cn_namelen) + NFSX_SATTR(v3)); 1510 mb = mreq; 1511 bpos = mtod(mb, caddr_t); 1512 nfsm_fhtom(dvp, v3); 1513 nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN); 1514 if (v3) { 1515 tl = nfsm_build(u_int32_t *, NFSX_UNSIGNED); 1516 if (fmode & O_EXCL) { 1517 *tl = txdr_unsigned(NFSV3CREATE_EXCLUSIVE); 1518 tl = nfsm_build(u_int32_t *, NFSX_V3CREATEVERF); 1519 #ifdef INET 1520 if (!TAILQ_EMPTY(&in_ifaddrhead)) 1521 *tl++ = IA_SIN(TAILQ_FIRST(&in_ifaddrhead))->sin_addr.s_addr; 1522 else 1523 #endif 1524 *tl++ = create_verf; 1525 *tl = ++create_verf; 1526 } else { 1527 *tl = txdr_unsigned(NFSV3CREATE_UNCHECKED); 1528 nfsm_v3attrbuild(vap, FALSE); 1529 } 1530 } else { 1531 sp = nfsm_build(struct nfsv2_sattr *, NFSX_V2SATTR); 1532 sp->sa_mode = vtonfsv2_mode(vap->va_type, vap->va_mode); 1533 sp->sa_uid = nfs_xdrneg1; 1534 sp->sa_gid = nfs_xdrneg1; 1535 sp->sa_size = 0; 1536 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime); 1537 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime); 1538 } 1539 nfsm_request(dvp, NFSPROC_CREATE, cnp->cn_thread, cnp->cn_cred); 1540 if (!error) { 1541 nfsm_mtofh(dvp, newvp, v3, gotvp); 1542 if (!gotvp) { 1543 if (newvp) { 1544 vput(newvp); 1545 newvp = NULL; 1546 } 1547 error = nfs_lookitup(dvp, cnp->cn_nameptr, 1548 cnp->cn_namelen, cnp->cn_cred, cnp->cn_thread, &np); 1549 if (!error) 1550 newvp = NFSTOV(np); 1551 } 1552 } 1553 if (v3) 1554 nfsm_wcc_data(dvp, wccflag); 1555 m_freem(mrep); 1556 nfsmout: 1557 if (error) { 1558 if (v3 && (fmode & O_EXCL) && error == NFSERR_NOTSUPP) { 1559 fmode &= ~O_EXCL; 1560 goto again; 1561 } 1562 if (newvp) 1563 vput(newvp); 1564 } else if (v3 && (fmode & O_EXCL)) { 1565 /* 1566 * We are normally called with only a partially initialized 1567 * VAP. Since the NFSv3 spec says that server may use the 1568 * file attributes to store the verifier, the spec requires 1569 * us to do a SETATTR RPC. FreeBSD servers store the verifier 1570 * in atime, but we can't really assume that all servers will 1571 * so we ensure that our SETATTR sets both atime and mtime. 1572 */ 1573 if (vap->va_mtime.tv_sec == VNOVAL) 1574 vfs_timestamp(&vap->va_mtime); 1575 if (vap->va_atime.tv_sec == VNOVAL) 1576 vap->va_atime = vap->va_mtime; 1577 error = nfs_setattrrpc(newvp, vap, cnp->cn_cred, cnp->cn_thread); 1578 if (error) 1579 vput(newvp); 1580 } 1581 if (!error) { 1582 if (cnp->cn_flags & MAKEENTRY) 1583 cache_enter(dvp, newvp, cnp); 1584 *ap->a_vpp = newvp; 1585 } 1586 mtx_lock(&(VTONFS(dvp))->n_mtx); 1587 VTONFS(dvp)->n_flag |= NMODIFIED; 1588 if (!wccflag) 1589 VTONFS(dvp)->n_attrstamp = 0; 1590 mtx_unlock(&(VTONFS(dvp))->n_mtx); 1591 return (error); 1592 } 1593 1594 /* 1595 * nfs file remove call 1596 * To try and make nfs semantics closer to ufs semantics, a file that has 1597 * other processes using the vnode is renamed instead of removed and then 1598 * removed later on the last close. 1599 * - If v_usecount > 1 1600 * If a rename is not already in the works 1601 * call nfs_sillyrename() to set it up 1602 * else 1603 * do the remove rpc 1604 */ 1605 static int 1606 nfs_remove(struct vop_remove_args *ap) 1607 { 1608 struct vnode *vp = ap->a_vp; 1609 struct vnode *dvp = ap->a_dvp; 1610 struct componentname *cnp = ap->a_cnp; 1611 struct nfsnode *np = VTONFS(vp); 1612 int error = 0; 1613 struct vattr vattr; 1614 1615 #ifndef DIAGNOSTIC 1616 if ((cnp->cn_flags & HASBUF) == 0) 1617 panic("nfs_remove: no name"); 1618 if (vrefcnt(vp) < 1) 1619 panic("nfs_remove: bad v_usecount"); 1620 #endif 1621 if (vp->v_type == VDIR) 1622 error = EPERM; 1623 else if (vrefcnt(vp) == 1 || (np->n_sillyrename && 1624 VOP_GETATTR(vp, &vattr, cnp->cn_cred, cnp->cn_thread) == 0 && 1625 vattr.va_nlink > 1)) { 1626 /* 1627 * Purge the name cache so that the chance of a lookup for 1628 * the name succeeding while the remove is in progress is 1629 * minimized. Without node locking it can still happen, such 1630 * that an I/O op returns ESTALE, but since you get this if 1631 * another host removes the file.. 1632 */ 1633 cache_purge(vp); 1634 /* 1635 * throw away biocache buffers, mainly to avoid 1636 * unnecessary delayed writes later. 1637 */ 1638 error = nfs_vinvalbuf(vp, 0, cnp->cn_thread, 1); 1639 /* Do the rpc */ 1640 if (error != EINTR && error != EIO) 1641 error = nfs_removerpc(dvp, cnp->cn_nameptr, 1642 cnp->cn_namelen, cnp->cn_cred, cnp->cn_thread); 1643 /* 1644 * Kludge City: If the first reply to the remove rpc is lost.. 1645 * the reply to the retransmitted request will be ENOENT 1646 * since the file was in fact removed 1647 * Therefore, we cheat and return success. 1648 */ 1649 if (error == ENOENT) 1650 error = 0; 1651 } else if (!np->n_sillyrename) 1652 error = nfs_sillyrename(dvp, vp, cnp); 1653 np->n_attrstamp = 0; 1654 return (error); 1655 } 1656 1657 /* 1658 * nfs file remove rpc called from nfs_inactive 1659 */ 1660 int 1661 nfs_removeit(struct sillyrename *sp) 1662 { 1663 /* 1664 * Make sure that the directory vnode is still valid. 1665 * XXX we should lock sp->s_dvp here. 1666 */ 1667 if (sp->s_dvp->v_type == VBAD) 1668 return (0); 1669 return (nfs_removerpc(sp->s_dvp, sp->s_name, sp->s_namlen, sp->s_cred, 1670 NULL)); 1671 } 1672 1673 /* 1674 * Nfs remove rpc, called from nfs_remove() and nfs_removeit(). 1675 */ 1676 static int 1677 nfs_removerpc(struct vnode *dvp, const char *name, int namelen, 1678 struct ucred *cred, struct thread *td) 1679 { 1680 caddr_t bpos, dpos; 1681 int error = 0, wccflag = NFSV3_WCCRATTR; 1682 struct mbuf *mreq, *mrep, *md, *mb; 1683 int v3 = NFS_ISV3(dvp); 1684 1685 nfsstats.rpccnt[NFSPROC_REMOVE]++; 1686 mreq = nfsm_reqhead(dvp, NFSPROC_REMOVE, 1687 NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(namelen)); 1688 mb = mreq; 1689 bpos = mtod(mb, caddr_t); 1690 nfsm_fhtom(dvp, v3); 1691 nfsm_strtom(name, namelen, NFS_MAXNAMLEN); 1692 nfsm_request(dvp, NFSPROC_REMOVE, td, cred); 1693 if (v3) 1694 nfsm_wcc_data(dvp, wccflag); 1695 m_freem(mrep); 1696 nfsmout: 1697 mtx_lock(&(VTONFS(dvp))->n_mtx); 1698 VTONFS(dvp)->n_flag |= NMODIFIED; 1699 if (!wccflag) 1700 VTONFS(dvp)->n_attrstamp = 0; 1701 mtx_unlock(&(VTONFS(dvp))->n_mtx); 1702 return (error); 1703 } 1704 1705 /* 1706 * nfs file rename call 1707 */ 1708 static int 1709 nfs_rename(struct vop_rename_args *ap) 1710 { 1711 struct vnode *fvp = ap->a_fvp; 1712 struct vnode *tvp = ap->a_tvp; 1713 struct vnode *fdvp = ap->a_fdvp; 1714 struct vnode *tdvp = ap->a_tdvp; 1715 struct componentname *tcnp = ap->a_tcnp; 1716 struct componentname *fcnp = ap->a_fcnp; 1717 int error; 1718 1719 #ifndef DIAGNOSTIC 1720 if ((tcnp->cn_flags & HASBUF) == 0 || 1721 (fcnp->cn_flags & HASBUF) == 0) 1722 panic("nfs_rename: no name"); 1723 #endif 1724 /* Check for cross-device rename */ 1725 if ((fvp->v_mount != tdvp->v_mount) || 1726 (tvp && (fvp->v_mount != tvp->v_mount))) { 1727 error = EXDEV; 1728 goto out; 1729 } 1730 1731 if (fvp == tvp) { 1732 nfs_printf("nfs_rename: fvp == tvp (can't happen)\n"); 1733 error = 0; 1734 goto out; 1735 } 1736 if ((error = vn_lock(fvp, LK_EXCLUSIVE, fcnp->cn_thread)) != 0) 1737 goto out; 1738 1739 /* 1740 * We have to flush B_DELWRI data prior to renaming 1741 * the file. If we don't, the delayed-write buffers 1742 * can be flushed out later after the file has gone stale 1743 * under NFSV3. NFSV2 does not have this problem because 1744 * ( as far as I can tell ) it flushes dirty buffers more 1745 * often. 1746 * 1747 * Skip the rename operation if the fsync fails, this can happen 1748 * due to the server's volume being full, when we pushed out data 1749 * that was written back to our cache earlier. Not checking for 1750 * this condition can result in potential (silent) data loss. 1751 */ 1752 error = VOP_FSYNC(fvp, MNT_WAIT, fcnp->cn_thread); 1753 VOP_UNLOCK(fvp, 0, fcnp->cn_thread); 1754 if (!error && tvp) 1755 error = VOP_FSYNC(tvp, MNT_WAIT, tcnp->cn_thread); 1756 if (error) 1757 goto out; 1758 1759 /* 1760 * If the tvp exists and is in use, sillyrename it before doing the 1761 * rename of the new file over it. 1762 * XXX Can't sillyrename a directory. 1763 */ 1764 if (tvp && vrefcnt(tvp) > 1 && !VTONFS(tvp)->n_sillyrename && 1765 tvp->v_type != VDIR && !nfs_sillyrename(tdvp, tvp, tcnp)) { 1766 vput(tvp); 1767 tvp = NULL; 1768 } 1769 1770 error = nfs_renamerpc(fdvp, fcnp->cn_nameptr, fcnp->cn_namelen, 1771 tdvp, tcnp->cn_nameptr, tcnp->cn_namelen, tcnp->cn_cred, 1772 tcnp->cn_thread); 1773 1774 if (fvp->v_type == VDIR) { 1775 if (tvp != NULL && tvp->v_type == VDIR) 1776 cache_purge(tdvp); 1777 cache_purge(fdvp); 1778 } 1779 1780 out: 1781 if (tdvp == tvp) 1782 vrele(tdvp); 1783 else 1784 vput(tdvp); 1785 if (tvp) 1786 vput(tvp); 1787 vrele(fdvp); 1788 vrele(fvp); 1789 /* 1790 * Kludge: Map ENOENT => 0 assuming that it is a reply to a retry. 1791 */ 1792 if (error == ENOENT) 1793 error = 0; 1794 return (error); 1795 } 1796 1797 /* 1798 * nfs file rename rpc called from nfs_remove() above 1799 */ 1800 static int 1801 nfs_renameit(struct vnode *sdvp, struct componentname *scnp, 1802 struct sillyrename *sp) 1803 { 1804 1805 return (nfs_renamerpc(sdvp, scnp->cn_nameptr, scnp->cn_namelen, sdvp, 1806 sp->s_name, sp->s_namlen, scnp->cn_cred, scnp->cn_thread)); 1807 } 1808 1809 /* 1810 * Do an nfs rename rpc. Called from nfs_rename() and nfs_renameit(). 1811 */ 1812 static int 1813 nfs_renamerpc(struct vnode *fdvp, const char *fnameptr, int fnamelen, 1814 struct vnode *tdvp, const char *tnameptr, int tnamelen, struct ucred *cred, 1815 struct thread *td) 1816 { 1817 caddr_t bpos, dpos; 1818 int error = 0, fwccflag = NFSV3_WCCRATTR, twccflag = NFSV3_WCCRATTR; 1819 struct mbuf *mreq, *mrep, *md, *mb; 1820 int v3 = NFS_ISV3(fdvp); 1821 1822 nfsstats.rpccnt[NFSPROC_RENAME]++; 1823 mreq = nfsm_reqhead(fdvp, NFSPROC_RENAME, 1824 (NFSX_FH(v3) + NFSX_UNSIGNED)*2 + nfsm_rndup(fnamelen) + 1825 nfsm_rndup(tnamelen)); 1826 mb = mreq; 1827 bpos = mtod(mb, caddr_t); 1828 nfsm_fhtom(fdvp, v3); 1829 nfsm_strtom(fnameptr, fnamelen, NFS_MAXNAMLEN); 1830 nfsm_fhtom(tdvp, v3); 1831 nfsm_strtom(tnameptr, tnamelen, NFS_MAXNAMLEN); 1832 nfsm_request(fdvp, NFSPROC_RENAME, td, cred); 1833 if (v3) { 1834 nfsm_wcc_data(fdvp, fwccflag); 1835 nfsm_wcc_data(tdvp, twccflag); 1836 } 1837 m_freem(mrep); 1838 nfsmout: 1839 mtx_lock(&(VTONFS(fdvp))->n_mtx); 1840 VTONFS(fdvp)->n_flag |= NMODIFIED; 1841 mtx_unlock(&(VTONFS(fdvp))->n_mtx); 1842 mtx_lock(&(VTONFS(tdvp))->n_mtx); 1843 VTONFS(tdvp)->n_flag |= NMODIFIED; 1844 mtx_unlock(&(VTONFS(tdvp))->n_mtx); 1845 if (!fwccflag) 1846 VTONFS(fdvp)->n_attrstamp = 0; 1847 if (!twccflag) 1848 VTONFS(tdvp)->n_attrstamp = 0; 1849 return (error); 1850 } 1851 1852 /* 1853 * nfs hard link create call 1854 */ 1855 static int 1856 nfs_link(struct vop_link_args *ap) 1857 { 1858 struct vnode *vp = ap->a_vp; 1859 struct vnode *tdvp = ap->a_tdvp; 1860 struct componentname *cnp = ap->a_cnp; 1861 caddr_t bpos, dpos; 1862 int error = 0, wccflag = NFSV3_WCCRATTR, attrflag = 0; 1863 struct mbuf *mreq, *mrep, *md, *mb; 1864 int v3; 1865 1866 if (vp->v_mount != tdvp->v_mount) { 1867 return (EXDEV); 1868 } 1869 1870 /* 1871 * Push all writes to the server, so that the attribute cache 1872 * doesn't get "out of sync" with the server. 1873 * XXX There should be a better way! 1874 */ 1875 VOP_FSYNC(vp, MNT_WAIT, cnp->cn_thread); 1876 1877 v3 = NFS_ISV3(vp); 1878 nfsstats.rpccnt[NFSPROC_LINK]++; 1879 mreq = nfsm_reqhead(vp, NFSPROC_LINK, 1880 NFSX_FH(v3)*2 + NFSX_UNSIGNED + nfsm_rndup(cnp->cn_namelen)); 1881 mb = mreq; 1882 bpos = mtod(mb, caddr_t); 1883 nfsm_fhtom(vp, v3); 1884 nfsm_fhtom(tdvp, v3); 1885 nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN); 1886 nfsm_request(vp, NFSPROC_LINK, cnp->cn_thread, cnp->cn_cred); 1887 if (v3) { 1888 nfsm_postop_attr(vp, attrflag); 1889 nfsm_wcc_data(tdvp, wccflag); 1890 } 1891 m_freem(mrep); 1892 nfsmout: 1893 mtx_lock(&(VTONFS(tdvp))->n_mtx); 1894 VTONFS(tdvp)->n_flag |= NMODIFIED; 1895 mtx_unlock(&(VTONFS(tdvp))->n_mtx); 1896 if (!attrflag) 1897 VTONFS(vp)->n_attrstamp = 0; 1898 if (!wccflag) 1899 VTONFS(tdvp)->n_attrstamp = 0; 1900 return (error); 1901 } 1902 1903 /* 1904 * nfs symbolic link create call 1905 */ 1906 static int 1907 nfs_symlink(struct vop_symlink_args *ap) 1908 { 1909 struct vnode *dvp = ap->a_dvp; 1910 struct vattr *vap = ap->a_vap; 1911 struct componentname *cnp = ap->a_cnp; 1912 struct nfsv2_sattr *sp; 1913 caddr_t bpos, dpos; 1914 int slen, error = 0, wccflag = NFSV3_WCCRATTR, gotvp; 1915 struct mbuf *mreq, *mrep, *md, *mb; 1916 struct vnode *newvp = NULL; 1917 int v3 = NFS_ISV3(dvp); 1918 1919 nfsstats.rpccnt[NFSPROC_SYMLINK]++; 1920 slen = strlen(ap->a_target); 1921 mreq = nfsm_reqhead(dvp, NFSPROC_SYMLINK, NFSX_FH(v3) + 2*NFSX_UNSIGNED + 1922 nfsm_rndup(cnp->cn_namelen) + nfsm_rndup(slen) + NFSX_SATTR(v3)); 1923 mb = mreq; 1924 bpos = mtod(mb, caddr_t); 1925 nfsm_fhtom(dvp, v3); 1926 nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN); 1927 if (v3) { 1928 nfsm_v3attrbuild(vap, FALSE); 1929 } 1930 nfsm_strtom(ap->a_target, slen, NFS_MAXPATHLEN); 1931 if (!v3) { 1932 sp = nfsm_build(struct nfsv2_sattr *, NFSX_V2SATTR); 1933 sp->sa_mode = vtonfsv2_mode(VLNK, vap->va_mode); 1934 sp->sa_uid = nfs_xdrneg1; 1935 sp->sa_gid = nfs_xdrneg1; 1936 sp->sa_size = nfs_xdrneg1; 1937 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime); 1938 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime); 1939 } 1940 1941 /* 1942 * Issue the NFS request and get the rpc response. 1943 * 1944 * Only NFSv3 responses returning an error of 0 actually return 1945 * a file handle that can be converted into newvp without having 1946 * to do an extra lookup rpc. 1947 */ 1948 nfsm_request(dvp, NFSPROC_SYMLINK, cnp->cn_thread, cnp->cn_cred); 1949 if (v3) { 1950 if (error == 0) 1951 nfsm_mtofh(dvp, newvp, v3, gotvp); 1952 nfsm_wcc_data(dvp, wccflag); 1953 } 1954 1955 /* 1956 * out code jumps -> here, mrep is also freed. 1957 */ 1958 1959 m_freem(mrep); 1960 nfsmout: 1961 1962 /* 1963 * If we do not have an error and we could not extract the newvp from 1964 * the response due to the request being NFSv2, we have to do a 1965 * lookup in order to obtain a newvp to return. 1966 */ 1967 if (error == 0 && newvp == NULL) { 1968 struct nfsnode *np = NULL; 1969 1970 error = nfs_lookitup(dvp, cnp->cn_nameptr, cnp->cn_namelen, 1971 cnp->cn_cred, cnp->cn_thread, &np); 1972 if (!error) 1973 newvp = NFSTOV(np); 1974 } 1975 if (error) { 1976 if (newvp) 1977 vput(newvp); 1978 } else { 1979 *ap->a_vpp = newvp; 1980 } 1981 mtx_lock(&(VTONFS(dvp))->n_mtx); 1982 VTONFS(dvp)->n_flag |= NMODIFIED; 1983 mtx_unlock(&(VTONFS(dvp))->n_mtx); 1984 if (!wccflag) 1985 VTONFS(dvp)->n_attrstamp = 0; 1986 return (error); 1987 } 1988 1989 /* 1990 * nfs make dir call 1991 */ 1992 static int 1993 nfs_mkdir(struct vop_mkdir_args *ap) 1994 { 1995 struct vnode *dvp = ap->a_dvp; 1996 struct vattr *vap = ap->a_vap; 1997 struct componentname *cnp = ap->a_cnp; 1998 struct nfsv2_sattr *sp; 1999 int len; 2000 struct nfsnode *np = NULL; 2001 struct vnode *newvp = NULL; 2002 caddr_t bpos, dpos; 2003 int error = 0, wccflag = NFSV3_WCCRATTR; 2004 int gotvp = 0; 2005 struct mbuf *mreq, *mrep, *md, *mb; 2006 struct vattr vattr; 2007 int v3 = NFS_ISV3(dvp); 2008 2009 if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred, cnp->cn_thread)) != 0) { 2010 return (error); 2011 } 2012 len = cnp->cn_namelen; 2013 nfsstats.rpccnt[NFSPROC_MKDIR]++; 2014 mreq = nfsm_reqhead(dvp, NFSPROC_MKDIR, 2015 NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(len) + NFSX_SATTR(v3)); 2016 mb = mreq; 2017 bpos = mtod(mb, caddr_t); 2018 nfsm_fhtom(dvp, v3); 2019 nfsm_strtom(cnp->cn_nameptr, len, NFS_MAXNAMLEN); 2020 if (v3) { 2021 nfsm_v3attrbuild(vap, FALSE); 2022 } else { 2023 sp = nfsm_build(struct nfsv2_sattr *, NFSX_V2SATTR); 2024 sp->sa_mode = vtonfsv2_mode(VDIR, vap->va_mode); 2025 sp->sa_uid = nfs_xdrneg1; 2026 sp->sa_gid = nfs_xdrneg1; 2027 sp->sa_size = nfs_xdrneg1; 2028 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime); 2029 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime); 2030 } 2031 nfsm_request(dvp, NFSPROC_MKDIR, cnp->cn_thread, cnp->cn_cred); 2032 if (!error) 2033 nfsm_mtofh(dvp, newvp, v3, gotvp); 2034 if (v3) 2035 nfsm_wcc_data(dvp, wccflag); 2036 m_freem(mrep); 2037 nfsmout: 2038 mtx_lock(&(VTONFS(dvp))->n_mtx); 2039 VTONFS(dvp)->n_flag |= NMODIFIED; 2040 mtx_unlock(&(VTONFS(dvp))->n_mtx); 2041 if (!wccflag) 2042 VTONFS(dvp)->n_attrstamp = 0; 2043 if (error == 0 && newvp == NULL) { 2044 error = nfs_lookitup(dvp, cnp->cn_nameptr, len, cnp->cn_cred, 2045 cnp->cn_thread, &np); 2046 if (!error) { 2047 newvp = NFSTOV(np); 2048 if (newvp->v_type != VDIR) 2049 error = EEXIST; 2050 } 2051 } 2052 if (error) { 2053 if (newvp) 2054 vput(newvp); 2055 } else 2056 *ap->a_vpp = newvp; 2057 return (error); 2058 } 2059 2060 /* 2061 * nfs remove directory call 2062 */ 2063 static int 2064 nfs_rmdir(struct vop_rmdir_args *ap) 2065 { 2066 struct vnode *vp = ap->a_vp; 2067 struct vnode *dvp = ap->a_dvp; 2068 struct componentname *cnp = ap->a_cnp; 2069 caddr_t bpos, dpos; 2070 int error = 0, wccflag = NFSV3_WCCRATTR; 2071 struct mbuf *mreq, *mrep, *md, *mb; 2072 int v3 = NFS_ISV3(dvp); 2073 2074 if (dvp == vp) 2075 return (EINVAL); 2076 nfsstats.rpccnt[NFSPROC_RMDIR]++; 2077 mreq = nfsm_reqhead(dvp, NFSPROC_RMDIR, 2078 NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(cnp->cn_namelen)); 2079 mb = mreq; 2080 bpos = mtod(mb, caddr_t); 2081 nfsm_fhtom(dvp, v3); 2082 nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN); 2083 nfsm_request(dvp, NFSPROC_RMDIR, cnp->cn_thread, cnp->cn_cred); 2084 if (v3) 2085 nfsm_wcc_data(dvp, wccflag); 2086 m_freem(mrep); 2087 nfsmout: 2088 mtx_lock(&(VTONFS(dvp))->n_mtx); 2089 VTONFS(dvp)->n_flag |= NMODIFIED; 2090 mtx_unlock(&(VTONFS(dvp))->n_mtx); 2091 if (!wccflag) 2092 VTONFS(dvp)->n_attrstamp = 0; 2093 cache_purge(dvp); 2094 cache_purge(vp); 2095 /* 2096 * Kludge: Map ENOENT => 0 assuming that you have a reply to a retry. 2097 */ 2098 if (error == ENOENT) 2099 error = 0; 2100 return (error); 2101 } 2102 2103 /* 2104 * nfs readdir call 2105 */ 2106 static int 2107 nfs_readdir(struct vop_readdir_args *ap) 2108 { 2109 struct vnode *vp = ap->a_vp; 2110 struct nfsnode *np = VTONFS(vp); 2111 struct uio *uio = ap->a_uio; 2112 int tresid, error = 0; 2113 struct vattr vattr; 2114 2115 if (vp->v_type != VDIR) 2116 return(EPERM); 2117 2118 /* 2119 * First, check for hit on the EOF offset cache 2120 */ 2121 if (np->n_direofoffset > 0 && uio->uio_offset >= np->n_direofoffset && 2122 (np->n_flag & NMODIFIED) == 0) { 2123 if (VOP_GETATTR(vp, &vattr, ap->a_cred, uio->uio_td) == 0) { 2124 mtx_lock(&np->n_mtx); 2125 if (!NFS_TIMESPEC_COMPARE(&np->n_mtime, &vattr.va_mtime)) { 2126 mtx_unlock(&np->n_mtx); 2127 nfsstats.direofcache_hits++; 2128 goto out; 2129 } else 2130 mtx_unlock(&np->n_mtx); 2131 } 2132 } 2133 2134 /* 2135 * Call nfs_bioread() to do the real work. 2136 */ 2137 tresid = uio->uio_resid; 2138 error = nfs_bioread(vp, uio, 0, ap->a_cred); 2139 2140 if (!error && uio->uio_resid == tresid) { 2141 nfsstats.direofcache_misses++; 2142 } 2143 out: 2144 return (error); 2145 } 2146 2147 /* 2148 * Readdir rpc call. 2149 * Called from below the buffer cache by nfs_doio(). 2150 */ 2151 int 2152 nfs_readdirrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred) 2153 { 2154 int len, left; 2155 struct dirent *dp = NULL; 2156 u_int32_t *tl; 2157 caddr_t cp; 2158 nfsuint64 *cookiep; 2159 caddr_t bpos, dpos; 2160 struct mbuf *mreq, *mrep, *md, *mb; 2161 nfsuint64 cookie; 2162 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 2163 struct nfsnode *dnp = VTONFS(vp); 2164 u_quad_t fileno; 2165 int error = 0, tlen, more_dirs = 1, blksiz = 0, bigenough = 1; 2166 int attrflag; 2167 int v3 = NFS_ISV3(vp); 2168 2169 #ifndef DIAGNOSTIC 2170 if (uiop->uio_iovcnt != 1 || (uiop->uio_offset & (DIRBLKSIZ - 1)) || 2171 (uiop->uio_resid & (DIRBLKSIZ - 1))) 2172 panic("nfs readdirrpc bad uio"); 2173 #endif 2174 2175 /* 2176 * If there is no cookie, assume directory was stale. 2177 */ 2178 nfs_dircookie_lock(dnp); 2179 cookiep = nfs_getcookie(dnp, uiop->uio_offset, 0); 2180 if (cookiep) { 2181 cookie = *cookiep; 2182 nfs_dircookie_unlock(dnp); 2183 } else { 2184 nfs_dircookie_unlock(dnp); 2185 return (NFSERR_BAD_COOKIE); 2186 } 2187 2188 /* 2189 * Loop around doing readdir rpc's of size nm_readdirsize 2190 * truncated to a multiple of DIRBLKSIZ. 2191 * The stopping criteria is EOF or buffer full. 2192 */ 2193 while (more_dirs && bigenough) { 2194 nfsstats.rpccnt[NFSPROC_READDIR]++; 2195 mreq = nfsm_reqhead(vp, NFSPROC_READDIR, NFSX_FH(v3) + 2196 NFSX_READDIR(v3)); 2197 mb = mreq; 2198 bpos = mtod(mb, caddr_t); 2199 nfsm_fhtom(vp, v3); 2200 if (v3) { 2201 tl = nfsm_build(u_int32_t *, 5 * NFSX_UNSIGNED); 2202 *tl++ = cookie.nfsuquad[0]; 2203 *tl++ = cookie.nfsuquad[1]; 2204 mtx_lock(&dnp->n_mtx); 2205 *tl++ = dnp->n_cookieverf.nfsuquad[0]; 2206 *tl++ = dnp->n_cookieverf.nfsuquad[1]; 2207 mtx_unlock(&dnp->n_mtx); 2208 } else { 2209 tl = nfsm_build(u_int32_t *, 2 * NFSX_UNSIGNED); 2210 *tl++ = cookie.nfsuquad[0]; 2211 } 2212 *tl = txdr_unsigned(nmp->nm_readdirsize); 2213 nfsm_request(vp, NFSPROC_READDIR, uiop->uio_td, cred); 2214 if (v3) { 2215 nfsm_postop_attr(vp, attrflag); 2216 if (!error) { 2217 tl = nfsm_dissect(u_int32_t *, 2218 2 * NFSX_UNSIGNED); 2219 mtx_lock(&dnp->n_mtx); 2220 dnp->n_cookieverf.nfsuquad[0] = *tl++; 2221 dnp->n_cookieverf.nfsuquad[1] = *tl; 2222 mtx_unlock(&dnp->n_mtx); 2223 } else { 2224 m_freem(mrep); 2225 goto nfsmout; 2226 } 2227 } 2228 tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED); 2229 more_dirs = fxdr_unsigned(int, *tl); 2230 2231 /* loop thru the dir entries, doctoring them to 4bsd form */ 2232 while (more_dirs && bigenough) { 2233 if (v3) { 2234 tl = nfsm_dissect(u_int32_t *, 2235 3 * NFSX_UNSIGNED); 2236 fileno = fxdr_hyper(tl); 2237 len = fxdr_unsigned(int, *(tl + 2)); 2238 } else { 2239 tl = nfsm_dissect(u_int32_t *, 2240 2 * NFSX_UNSIGNED); 2241 fileno = fxdr_unsigned(u_quad_t, *tl++); 2242 len = fxdr_unsigned(int, *tl); 2243 } 2244 if (len <= 0 || len > NFS_MAXNAMLEN) { 2245 error = EBADRPC; 2246 m_freem(mrep); 2247 goto nfsmout; 2248 } 2249 tlen = nfsm_rndup(len); 2250 if (tlen == len) 2251 tlen += 4; /* To ensure null termination */ 2252 left = DIRBLKSIZ - blksiz; 2253 if ((tlen + DIRHDSIZ) > left) { 2254 dp->d_reclen += left; 2255 uiop->uio_iov->iov_base = 2256 (char *)uiop->uio_iov->iov_base + left; 2257 uiop->uio_iov->iov_len -= left; 2258 uiop->uio_offset += left; 2259 uiop->uio_resid -= left; 2260 blksiz = 0; 2261 } 2262 if ((tlen + DIRHDSIZ) > uiop->uio_resid) 2263 bigenough = 0; 2264 if (bigenough) { 2265 dp = (struct dirent *)uiop->uio_iov->iov_base; 2266 dp->d_fileno = (int)fileno; 2267 dp->d_namlen = len; 2268 dp->d_reclen = tlen + DIRHDSIZ; 2269 dp->d_type = DT_UNKNOWN; 2270 blksiz += dp->d_reclen; 2271 if (blksiz == DIRBLKSIZ) 2272 blksiz = 0; 2273 uiop->uio_offset += DIRHDSIZ; 2274 uiop->uio_resid -= DIRHDSIZ; 2275 uiop->uio_iov->iov_base = 2276 (char *)uiop->uio_iov->iov_base + DIRHDSIZ; 2277 uiop->uio_iov->iov_len -= DIRHDSIZ; 2278 nfsm_mtouio(uiop, len); 2279 cp = uiop->uio_iov->iov_base; 2280 tlen -= len; 2281 *cp = '\0'; /* null terminate */ 2282 uiop->uio_iov->iov_base = 2283 (char *)uiop->uio_iov->iov_base + tlen; 2284 uiop->uio_iov->iov_len -= tlen; 2285 uiop->uio_offset += tlen; 2286 uiop->uio_resid -= tlen; 2287 } else 2288 nfsm_adv(nfsm_rndup(len)); 2289 if (v3) { 2290 tl = nfsm_dissect(u_int32_t *, 2291 3 * NFSX_UNSIGNED); 2292 } else { 2293 tl = nfsm_dissect(u_int32_t *, 2294 2 * NFSX_UNSIGNED); 2295 } 2296 if (bigenough) { 2297 cookie.nfsuquad[0] = *tl++; 2298 if (v3) 2299 cookie.nfsuquad[1] = *tl++; 2300 } else if (v3) 2301 tl += 2; 2302 else 2303 tl++; 2304 more_dirs = fxdr_unsigned(int, *tl); 2305 } 2306 /* 2307 * If at end of rpc data, get the eof boolean 2308 */ 2309 if (!more_dirs) { 2310 tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED); 2311 more_dirs = (fxdr_unsigned(int, *tl) == 0); 2312 } 2313 m_freem(mrep); 2314 } 2315 /* 2316 * Fill last record, iff any, out to a multiple of DIRBLKSIZ 2317 * by increasing d_reclen for the last record. 2318 */ 2319 if (blksiz > 0) { 2320 left = DIRBLKSIZ - blksiz; 2321 dp->d_reclen += left; 2322 uiop->uio_iov->iov_base = 2323 (char *)uiop->uio_iov->iov_base + left; 2324 uiop->uio_iov->iov_len -= left; 2325 uiop->uio_offset += left; 2326 uiop->uio_resid -= left; 2327 } 2328 2329 /* 2330 * We are now either at the end of the directory or have filled the 2331 * block. 2332 */ 2333 if (bigenough) 2334 dnp->n_direofoffset = uiop->uio_offset; 2335 else { 2336 if (uiop->uio_resid > 0) 2337 nfs_printf("EEK! readdirrpc resid > 0\n"); 2338 nfs_dircookie_lock(dnp); 2339 cookiep = nfs_getcookie(dnp, uiop->uio_offset, 1); 2340 *cookiep = cookie; 2341 nfs_dircookie_unlock(dnp); 2342 } 2343 nfsmout: 2344 return (error); 2345 } 2346 2347 /* 2348 * NFS V3 readdir plus RPC. Used in place of nfs_readdirrpc(). 2349 */ 2350 int 2351 nfs_readdirplusrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred) 2352 { 2353 int len, left; 2354 struct dirent *dp; 2355 u_int32_t *tl; 2356 caddr_t cp; 2357 struct vnode *newvp; 2358 nfsuint64 *cookiep; 2359 caddr_t bpos, dpos, dpossav1, dpossav2; 2360 struct mbuf *mreq, *mrep, *md, *mb, *mdsav1, *mdsav2; 2361 struct nameidata nami, *ndp = &nami; 2362 struct componentname *cnp = &ndp->ni_cnd; 2363 nfsuint64 cookie; 2364 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 2365 struct nfsnode *dnp = VTONFS(vp), *np; 2366 nfsfh_t *fhp; 2367 u_quad_t fileno; 2368 int error = 0, tlen, more_dirs = 1, blksiz = 0, doit, bigenough = 1, i; 2369 int attrflag, fhsize; 2370 2371 #ifndef nolint 2372 dp = NULL; 2373 #endif 2374 #ifndef DIAGNOSTIC 2375 if (uiop->uio_iovcnt != 1 || (uiop->uio_offset & (DIRBLKSIZ - 1)) || 2376 (uiop->uio_resid & (DIRBLKSIZ - 1))) 2377 panic("nfs readdirplusrpc bad uio"); 2378 #endif 2379 ndp->ni_dvp = vp; 2380 newvp = NULLVP; 2381 2382 /* 2383 * If there is no cookie, assume directory was stale. 2384 */ 2385 nfs_dircookie_lock(dnp); 2386 cookiep = nfs_getcookie(dnp, uiop->uio_offset, 0); 2387 if (cookiep) { 2388 cookie = *cookiep; 2389 nfs_dircookie_unlock(dnp); 2390 } else { 2391 nfs_dircookie_unlock(dnp); 2392 return (NFSERR_BAD_COOKIE); 2393 } 2394 /* 2395 * Loop around doing readdir rpc's of size nm_readdirsize 2396 * truncated to a multiple of DIRBLKSIZ. 2397 * The stopping criteria is EOF or buffer full. 2398 */ 2399 while (more_dirs && bigenough) { 2400 nfsstats.rpccnt[NFSPROC_READDIRPLUS]++; 2401 mreq = nfsm_reqhead(vp, NFSPROC_READDIRPLUS, 2402 NFSX_FH(1) + 6 * NFSX_UNSIGNED); 2403 mb = mreq; 2404 bpos = mtod(mb, caddr_t); 2405 nfsm_fhtom(vp, 1); 2406 tl = nfsm_build(u_int32_t *, 6 * NFSX_UNSIGNED); 2407 *tl++ = cookie.nfsuquad[0]; 2408 *tl++ = cookie.nfsuquad[1]; 2409 mtx_lock(&dnp->n_mtx); 2410 *tl++ = dnp->n_cookieverf.nfsuquad[0]; 2411 *tl++ = dnp->n_cookieverf.nfsuquad[1]; 2412 mtx_unlock(&dnp->n_mtx); 2413 *tl++ = txdr_unsigned(nmp->nm_readdirsize); 2414 *tl = txdr_unsigned(nmp->nm_rsize); 2415 nfsm_request(vp, NFSPROC_READDIRPLUS, uiop->uio_td, cred); 2416 nfsm_postop_attr(vp, attrflag); 2417 if (error) { 2418 m_freem(mrep); 2419 goto nfsmout; 2420 } 2421 tl = nfsm_dissect(u_int32_t *, 3 * NFSX_UNSIGNED); 2422 mtx_lock(&dnp->n_mtx); 2423 dnp->n_cookieverf.nfsuquad[0] = *tl++; 2424 dnp->n_cookieverf.nfsuquad[1] = *tl++; 2425 mtx_unlock(&dnp->n_mtx); 2426 more_dirs = fxdr_unsigned(int, *tl); 2427 2428 /* loop thru the dir entries, doctoring them to 4bsd form */ 2429 while (more_dirs && bigenough) { 2430 tl = nfsm_dissect(u_int32_t *, 3 * NFSX_UNSIGNED); 2431 fileno = fxdr_hyper(tl); 2432 len = fxdr_unsigned(int, *(tl + 2)); 2433 if (len <= 0 || len > NFS_MAXNAMLEN) { 2434 error = EBADRPC; 2435 m_freem(mrep); 2436 goto nfsmout; 2437 } 2438 tlen = nfsm_rndup(len); 2439 if (tlen == len) 2440 tlen += 4; /* To ensure null termination*/ 2441 left = DIRBLKSIZ - blksiz; 2442 if ((tlen + DIRHDSIZ) > left) { 2443 dp->d_reclen += left; 2444 uiop->uio_iov->iov_base = 2445 (char *)uiop->uio_iov->iov_base + left; 2446 uiop->uio_iov->iov_len -= left; 2447 uiop->uio_offset += left; 2448 uiop->uio_resid -= left; 2449 blksiz = 0; 2450 } 2451 if ((tlen + DIRHDSIZ) > uiop->uio_resid) 2452 bigenough = 0; 2453 if (bigenough) { 2454 dp = (struct dirent *)uiop->uio_iov->iov_base; 2455 dp->d_fileno = (int)fileno; 2456 dp->d_namlen = len; 2457 dp->d_reclen = tlen + DIRHDSIZ; 2458 dp->d_type = DT_UNKNOWN; 2459 blksiz += dp->d_reclen; 2460 if (blksiz == DIRBLKSIZ) 2461 blksiz = 0; 2462 uiop->uio_offset += DIRHDSIZ; 2463 uiop->uio_resid -= DIRHDSIZ; 2464 uiop->uio_iov->iov_base = 2465 (char *)uiop->uio_iov->iov_base + DIRHDSIZ; 2466 uiop->uio_iov->iov_len -= DIRHDSIZ; 2467 cnp->cn_nameptr = uiop->uio_iov->iov_base; 2468 cnp->cn_namelen = len; 2469 nfsm_mtouio(uiop, len); 2470 cp = uiop->uio_iov->iov_base; 2471 tlen -= len; 2472 *cp = '\0'; 2473 uiop->uio_iov->iov_base = 2474 (char *)uiop->uio_iov->iov_base + tlen; 2475 uiop->uio_iov->iov_len -= tlen; 2476 uiop->uio_offset += tlen; 2477 uiop->uio_resid -= tlen; 2478 } else 2479 nfsm_adv(nfsm_rndup(len)); 2480 tl = nfsm_dissect(u_int32_t *, 3 * NFSX_UNSIGNED); 2481 if (bigenough) { 2482 cookie.nfsuquad[0] = *tl++; 2483 cookie.nfsuquad[1] = *tl++; 2484 } else 2485 tl += 2; 2486 2487 /* 2488 * Since the attributes are before the file handle 2489 * (sigh), we must skip over the attributes and then 2490 * come back and get them. 2491 */ 2492 attrflag = fxdr_unsigned(int, *tl); 2493 if (attrflag) { 2494 dpossav1 = dpos; 2495 mdsav1 = md; 2496 nfsm_adv(NFSX_V3FATTR); 2497 tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED); 2498 doit = fxdr_unsigned(int, *tl); 2499 /* 2500 * Skip loading the attrs for "..". There's a 2501 * race between loading the attrs here and 2502 * lookups that look for the directory currently 2503 * being read (in the parent). We try to acquire 2504 * the exclusive lock on ".." here, owning the 2505 * lock on the directory being read. Lookup will 2506 * hold the lock on ".." and try to acquire the 2507 * lock on the directory being read. 2508 * 2509 * There are other ways of fixing this, one would 2510 * be to do a trylock on the ".." vnode and skip 2511 * loading the attrs on ".." if it happens to be 2512 * locked by another process. But skipping the 2513 * attrload on ".." seems the easiest option. 2514 */ 2515 if (strcmp(dp->d_name, "..") == 0) { 2516 doit = 0; 2517 /* 2518 * We've already skipped over the attrs, 2519 * skip over the filehandle. And store d_type 2520 * as VDIR. 2521 */ 2522 tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED); 2523 i = fxdr_unsigned(int, *tl); 2524 nfsm_adv(nfsm_rndup(i)); 2525 dp->d_type = IFTODT(VTTOIF(VDIR)); 2526 } 2527 if (doit) { 2528 nfsm_getfh(fhp, fhsize, 1); 2529 if (NFS_CMPFH(dnp, fhp, fhsize)) { 2530 VREF(vp); 2531 newvp = vp; 2532 np = dnp; 2533 } else { 2534 error = nfs_nget(vp->v_mount, fhp, 2535 fhsize, &np, LK_EXCLUSIVE); 2536 if (error) 2537 doit = 0; 2538 else 2539 newvp = NFSTOV(np); 2540 } 2541 } 2542 if (doit && bigenough) { 2543 dpossav2 = dpos; 2544 dpos = dpossav1; 2545 mdsav2 = md; 2546 md = mdsav1; 2547 nfsm_loadattr(newvp, NULL); 2548 dpos = dpossav2; 2549 md = mdsav2; 2550 dp->d_type = 2551 IFTODT(VTTOIF(np->n_vattr.va_type)); 2552 ndp->ni_vp = newvp; 2553 /* 2554 * Update n_ctime so subsequent lookup 2555 * doesn't purge entry. 2556 */ 2557 np->n_ctime = np->n_vattr.va_ctime; 2558 cache_enter(ndp->ni_dvp, ndp->ni_vp, cnp); 2559 } 2560 } else { 2561 /* Just skip over the file handle */ 2562 tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED); 2563 i = fxdr_unsigned(int, *tl); 2564 if (i) { 2565 tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED); 2566 fhsize = fxdr_unsigned(int, *tl); 2567 nfsm_adv(nfsm_rndup(fhsize)); 2568 } 2569 } 2570 if (newvp != NULLVP) { 2571 if (newvp == vp) 2572 vrele(newvp); 2573 else 2574 vput(newvp); 2575 newvp = NULLVP; 2576 } 2577 tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED); 2578 more_dirs = fxdr_unsigned(int, *tl); 2579 } 2580 /* 2581 * If at end of rpc data, get the eof boolean 2582 */ 2583 if (!more_dirs) { 2584 tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED); 2585 more_dirs = (fxdr_unsigned(int, *tl) == 0); 2586 } 2587 m_freem(mrep); 2588 } 2589 /* 2590 * Fill last record, iff any, out to a multiple of DIRBLKSIZ 2591 * by increasing d_reclen for the last record. 2592 */ 2593 if (blksiz > 0) { 2594 left = DIRBLKSIZ - blksiz; 2595 dp->d_reclen += left; 2596 uiop->uio_iov->iov_base = 2597 (char *)uiop->uio_iov->iov_base + left; 2598 uiop->uio_iov->iov_len -= left; 2599 uiop->uio_offset += left; 2600 uiop->uio_resid -= left; 2601 } 2602 2603 /* 2604 * We are now either at the end of the directory or have filled the 2605 * block. 2606 */ 2607 if (bigenough) 2608 dnp->n_direofoffset = uiop->uio_offset; 2609 else { 2610 if (uiop->uio_resid > 0) 2611 nfs_printf("EEK! readdirplusrpc resid > 0\n"); 2612 nfs_dircookie_lock(dnp); 2613 cookiep = nfs_getcookie(dnp, uiop->uio_offset, 1); 2614 *cookiep = cookie; 2615 nfs_dircookie_unlock(dnp); 2616 } 2617 nfsmout: 2618 if (newvp != NULLVP) { 2619 if (newvp == vp) 2620 vrele(newvp); 2621 else 2622 vput(newvp); 2623 newvp = NULLVP; 2624 } 2625 return (error); 2626 } 2627 2628 /* 2629 * Silly rename. To make the NFS filesystem that is stateless look a little 2630 * more like the "ufs" a remove of an active vnode is translated to a rename 2631 * to a funny looking filename that is removed by nfs_inactive on the 2632 * nfsnode. There is the potential for another process on a different client 2633 * to create the same funny name between the nfs_lookitup() fails and the 2634 * nfs_rename() completes, but... 2635 */ 2636 static int 2637 nfs_sillyrename(struct vnode *dvp, struct vnode *vp, struct componentname *cnp) 2638 { 2639 struct sillyrename *sp; 2640 struct nfsnode *np; 2641 int error; 2642 short pid; 2643 unsigned int lticks; 2644 2645 cache_purge(dvp); 2646 np = VTONFS(vp); 2647 #ifndef DIAGNOSTIC 2648 if (vp->v_type == VDIR) 2649 panic("nfs: sillyrename dir"); 2650 #endif 2651 MALLOC(sp, struct sillyrename *, sizeof (struct sillyrename), 2652 M_NFSREQ, M_WAITOK); 2653 sp->s_cred = crhold(cnp->cn_cred); 2654 sp->s_dvp = dvp; 2655 sp->s_removeit = nfs_removeit; 2656 VREF(dvp); 2657 2658 /* 2659 * Fudge together a funny name. 2660 * Changing the format of the funny name to accomodate more 2661 * sillynames per directory. 2662 * The name is now changed to .nfs.<ticks>.<pid>.4, where ticks is 2663 * CPU ticks since boot. 2664 */ 2665 pid = cnp->cn_thread->td_proc->p_pid; 2666 lticks = (unsigned int)ticks; 2667 for ( ; ; ) { 2668 sp->s_namlen = sprintf(sp->s_name, 2669 ".nfs.%08x.%04x4.4", lticks, 2670 pid); 2671 if (nfs_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred, 2672 cnp->cn_thread, NULL)) 2673 break; 2674 lticks++; 2675 } 2676 error = nfs_renameit(dvp, cnp, sp); 2677 if (error) 2678 goto bad; 2679 error = nfs_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred, 2680 cnp->cn_thread, &np); 2681 np->n_sillyrename = sp; 2682 return (0); 2683 bad: 2684 vrele(sp->s_dvp); 2685 crfree(sp->s_cred); 2686 free((caddr_t)sp, M_NFSREQ); 2687 return (error); 2688 } 2689 2690 /* 2691 * Look up a file name and optionally either update the file handle or 2692 * allocate an nfsnode, depending on the value of npp. 2693 * npp == NULL --> just do the lookup 2694 * *npp == NULL --> allocate a new nfsnode and make sure attributes are 2695 * handled too 2696 * *npp != NULL --> update the file handle in the vnode 2697 */ 2698 static int 2699 nfs_lookitup(struct vnode *dvp, const char *name, int len, struct ucred *cred, 2700 struct thread *td, struct nfsnode **npp) 2701 { 2702 struct vnode *newvp = NULL; 2703 struct nfsnode *np, *dnp = VTONFS(dvp); 2704 caddr_t bpos, dpos; 2705 int error = 0, fhlen, attrflag; 2706 struct mbuf *mreq, *mrep, *md, *mb; 2707 nfsfh_t *nfhp; 2708 int v3 = NFS_ISV3(dvp); 2709 2710 nfsstats.rpccnt[NFSPROC_LOOKUP]++; 2711 mreq = nfsm_reqhead(dvp, NFSPROC_LOOKUP, 2712 NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(len)); 2713 mb = mreq; 2714 bpos = mtod(mb, caddr_t); 2715 nfsm_fhtom(dvp, v3); 2716 nfsm_strtom(name, len, NFS_MAXNAMLEN); 2717 nfsm_request(dvp, NFSPROC_LOOKUP, td, cred); 2718 if (npp && !error) { 2719 nfsm_getfh(nfhp, fhlen, v3); 2720 if (*npp) { 2721 np = *npp; 2722 if (np->n_fhsize > NFS_SMALLFH && fhlen <= NFS_SMALLFH) { 2723 free((caddr_t)np->n_fhp, M_NFSBIGFH); 2724 np->n_fhp = &np->n_fh; 2725 } else if (np->n_fhsize <= NFS_SMALLFH && fhlen>NFS_SMALLFH) 2726 np->n_fhp =(nfsfh_t *)malloc(fhlen, M_NFSBIGFH, M_WAITOK); 2727 bcopy((caddr_t)nfhp, (caddr_t)np->n_fhp, fhlen); 2728 np->n_fhsize = fhlen; 2729 newvp = NFSTOV(np); 2730 } else if (NFS_CMPFH(dnp, nfhp, fhlen)) { 2731 VREF(dvp); 2732 newvp = dvp; 2733 } else { 2734 error = nfs_nget(dvp->v_mount, nfhp, fhlen, &np, LK_EXCLUSIVE); 2735 if (error) { 2736 m_freem(mrep); 2737 return (error); 2738 } 2739 newvp = NFSTOV(np); 2740 } 2741 if (v3) { 2742 nfsm_postop_attr(newvp, attrflag); 2743 if (!attrflag && *npp == NULL) { 2744 m_freem(mrep); 2745 if (newvp == dvp) 2746 vrele(newvp); 2747 else 2748 vput(newvp); 2749 return (ENOENT); 2750 } 2751 } else 2752 nfsm_loadattr(newvp, NULL); 2753 } 2754 m_freem(mrep); 2755 nfsmout: 2756 if (npp && *npp == NULL) { 2757 if (error) { 2758 if (newvp) { 2759 if (newvp == dvp) 2760 vrele(newvp); 2761 else 2762 vput(newvp); 2763 } 2764 } else 2765 *npp = np; 2766 } 2767 return (error); 2768 } 2769 2770 /* 2771 * Nfs Version 3 commit rpc 2772 */ 2773 int 2774 nfs_commit(struct vnode *vp, u_quad_t offset, int cnt, struct ucred *cred, 2775 struct thread *td) 2776 { 2777 u_int32_t *tl; 2778 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 2779 caddr_t bpos, dpos; 2780 int error = 0, wccflag = NFSV3_WCCRATTR; 2781 struct mbuf *mreq, *mrep, *md, *mb; 2782 2783 mtx_lock(&nmp->nm_mtx); 2784 if ((nmp->nm_state & NFSSTA_HASWRITEVERF) == 0) { 2785 mtx_unlock(&nmp->nm_mtx); 2786 return (0); 2787 } 2788 mtx_unlock(&nmp->nm_mtx); 2789 nfsstats.rpccnt[NFSPROC_COMMIT]++; 2790 mreq = nfsm_reqhead(vp, NFSPROC_COMMIT, NFSX_FH(1)); 2791 mb = mreq; 2792 bpos = mtod(mb, caddr_t); 2793 nfsm_fhtom(vp, 1); 2794 tl = nfsm_build(u_int32_t *, 3 * NFSX_UNSIGNED); 2795 txdr_hyper(offset, tl); 2796 tl += 2; 2797 *tl = txdr_unsigned(cnt); 2798 nfsm_request(vp, NFSPROC_COMMIT, td, cred); 2799 nfsm_wcc_data(vp, wccflag); 2800 if (!error) { 2801 tl = nfsm_dissect(u_int32_t *, NFSX_V3WRITEVERF); 2802 if (bcmp((caddr_t)nmp->nm_verf, (caddr_t)tl, 2803 NFSX_V3WRITEVERF)) { 2804 bcopy((caddr_t)tl, (caddr_t)nmp->nm_verf, 2805 NFSX_V3WRITEVERF); 2806 error = NFSERR_STALEWRITEVERF; 2807 } 2808 } 2809 m_freem(mrep); 2810 nfsmout: 2811 return (error); 2812 } 2813 2814 /* 2815 * Strategy routine. 2816 * For async requests when nfsiod(s) are running, queue the request by 2817 * calling nfs_asyncio(), otherwise just all nfs_doio() to do the 2818 * request. 2819 */ 2820 static int 2821 nfs_strategy(struct vop_strategy_args *ap) 2822 { 2823 struct buf *bp = ap->a_bp; 2824 struct ucred *cr; 2825 2826 KASSERT(!(bp->b_flags & B_DONE), ("nfs_strategy: buffer %p unexpectedly marked B_DONE", bp)); 2827 KASSERT(BUF_REFCNT(bp) > 0, ("nfs_strategy: buffer %p not locked", bp)); 2828 2829 if (bp->b_iocmd == BIO_READ) 2830 cr = bp->b_rcred; 2831 else 2832 cr = bp->b_wcred; 2833 2834 /* 2835 * If the op is asynchronous and an i/o daemon is waiting 2836 * queue the request, wake it up and wait for completion 2837 * otherwise just do it ourselves. 2838 */ 2839 if ((bp->b_flags & B_ASYNC) == 0 || 2840 nfs_asyncio(VFSTONFS(ap->a_vp->v_mount), bp, NOCRED, curthread)) 2841 (void)nfs_doio(ap->a_vp, bp, cr, curthread); 2842 return (0); 2843 } 2844 2845 /* 2846 * fsync vnode op. Just call nfs_flush() with commit == 1. 2847 */ 2848 /* ARGSUSED */ 2849 static int 2850 nfs_fsync(struct vop_fsync_args *ap) 2851 { 2852 return (nfs_flush(ap->a_vp, ap->a_waitfor, ap->a_td, 1)); 2853 } 2854 2855 /* 2856 * Flush all the blocks associated with a vnode. 2857 * Walk through the buffer pool and push any dirty pages 2858 * associated with the vnode. 2859 */ 2860 static int 2861 nfs_flush(struct vnode *vp, int waitfor, struct thread *td, 2862 int commit) 2863 { 2864 struct nfsnode *np = VTONFS(vp); 2865 struct buf *bp; 2866 int i; 2867 struct buf *nbp; 2868 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 2869 int s, error = 0, slptimeo = 0, slpflag = 0, retv, bvecpos; 2870 int passone = 1; 2871 u_quad_t off, endoff, toff; 2872 struct ucred* wcred = NULL; 2873 struct buf **bvec = NULL; 2874 #ifndef NFS_COMMITBVECSIZ 2875 #define NFS_COMMITBVECSIZ 20 2876 #endif 2877 struct buf *bvec_on_stack[NFS_COMMITBVECSIZ]; 2878 int bvecsize = 0, bveccount; 2879 2880 if (nmp->nm_flag & NFSMNT_INT) 2881 slpflag = PCATCH; 2882 if (!commit) 2883 passone = 0; 2884 /* 2885 * A b_flags == (B_DELWRI | B_NEEDCOMMIT) block has been written to the 2886 * server, but has not been committed to stable storage on the server 2887 * yet. On the first pass, the byte range is worked out and the commit 2888 * rpc is done. On the second pass, nfs_writebp() is called to do the 2889 * job. 2890 */ 2891 again: 2892 off = (u_quad_t)-1; 2893 endoff = 0; 2894 bvecpos = 0; 2895 if (NFS_ISV3(vp) && commit) { 2896 s = splbio(); 2897 if (bvec != NULL && bvec != bvec_on_stack) 2898 free(bvec, M_TEMP); 2899 /* 2900 * Count up how many buffers waiting for a commit. 2901 */ 2902 bveccount = 0; 2903 VI_LOCK(vp); 2904 TAILQ_FOREACH_SAFE(bp, &vp->v_bufobj.bo_dirty.bv_hd, b_bobufs, nbp) { 2905 if (BUF_REFCNT(bp) == 0 && 2906 (bp->b_flags & (B_DELWRI | B_NEEDCOMMIT)) 2907 == (B_DELWRI | B_NEEDCOMMIT)) 2908 bveccount++; 2909 } 2910 /* 2911 * Allocate space to remember the list of bufs to commit. It is 2912 * important to use M_NOWAIT here to avoid a race with nfs_write. 2913 * If we can't get memory (for whatever reason), we will end up 2914 * committing the buffers one-by-one in the loop below. 2915 */ 2916 if (bveccount > NFS_COMMITBVECSIZ) { 2917 /* 2918 * Release the vnode interlock to avoid a lock 2919 * order reversal. 2920 */ 2921 VI_UNLOCK(vp); 2922 bvec = (struct buf **) 2923 malloc(bveccount * sizeof(struct buf *), 2924 M_TEMP, M_NOWAIT); 2925 VI_LOCK(vp); 2926 if (bvec == NULL) { 2927 bvec = bvec_on_stack; 2928 bvecsize = NFS_COMMITBVECSIZ; 2929 } else 2930 bvecsize = bveccount; 2931 } else { 2932 bvec = bvec_on_stack; 2933 bvecsize = NFS_COMMITBVECSIZ; 2934 } 2935 TAILQ_FOREACH_SAFE(bp, &vp->v_bufobj.bo_dirty.bv_hd, b_bobufs, nbp) { 2936 if (bvecpos >= bvecsize) 2937 break; 2938 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT, NULL)) { 2939 nbp = TAILQ_NEXT(bp, b_bobufs); 2940 continue; 2941 } 2942 if ((bp->b_flags & (B_DELWRI | B_NEEDCOMMIT)) != 2943 (B_DELWRI | B_NEEDCOMMIT)) { 2944 BUF_UNLOCK(bp); 2945 nbp = TAILQ_NEXT(bp, b_bobufs); 2946 continue; 2947 } 2948 VI_UNLOCK(vp); 2949 bremfree(bp); 2950 /* 2951 * Work out if all buffers are using the same cred 2952 * so we can deal with them all with one commit. 2953 * 2954 * NOTE: we are not clearing B_DONE here, so we have 2955 * to do it later on in this routine if we intend to 2956 * initiate I/O on the bp. 2957 * 2958 * Note: to avoid loopback deadlocks, we do not 2959 * assign b_runningbufspace. 2960 */ 2961 if (wcred == NULL) 2962 wcred = bp->b_wcred; 2963 else if (wcred != bp->b_wcred) 2964 wcred = NOCRED; 2965 vfs_busy_pages(bp, 1); 2966 2967 VI_LOCK(vp); 2968 /* 2969 * bp is protected by being locked, but nbp is not 2970 * and vfs_busy_pages() may sleep. We have to 2971 * recalculate nbp. 2972 */ 2973 nbp = TAILQ_NEXT(bp, b_bobufs); 2974 2975 /* 2976 * A list of these buffers is kept so that the 2977 * second loop knows which buffers have actually 2978 * been committed. This is necessary, since there 2979 * may be a race between the commit rpc and new 2980 * uncommitted writes on the file. 2981 */ 2982 bvec[bvecpos++] = bp; 2983 toff = ((u_quad_t)bp->b_blkno) * DEV_BSIZE + 2984 bp->b_dirtyoff; 2985 if (toff < off) 2986 off = toff; 2987 toff += (u_quad_t)(bp->b_dirtyend - bp->b_dirtyoff); 2988 if (toff > endoff) 2989 endoff = toff; 2990 } 2991 splx(s); 2992 VI_UNLOCK(vp); 2993 } 2994 if (bvecpos > 0) { 2995 /* 2996 * Commit data on the server, as required. 2997 * If all bufs are using the same wcred, then use that with 2998 * one call for all of them, otherwise commit each one 2999 * separately. 3000 */ 3001 if (wcred != NOCRED) 3002 retv = nfs_commit(vp, off, (int)(endoff - off), 3003 wcred, td); 3004 else { 3005 retv = 0; 3006 for (i = 0; i < bvecpos; i++) { 3007 off_t off, size; 3008 bp = bvec[i]; 3009 off = ((u_quad_t)bp->b_blkno) * DEV_BSIZE + 3010 bp->b_dirtyoff; 3011 size = (u_quad_t)(bp->b_dirtyend 3012 - bp->b_dirtyoff); 3013 retv = nfs_commit(vp, off, (int)size, 3014 bp->b_wcred, td); 3015 if (retv) break; 3016 } 3017 } 3018 3019 if (retv == NFSERR_STALEWRITEVERF) 3020 nfs_clearcommit(vp->v_mount); 3021 3022 /* 3023 * Now, either mark the blocks I/O done or mark the 3024 * blocks dirty, depending on whether the commit 3025 * succeeded. 3026 */ 3027 for (i = 0; i < bvecpos; i++) { 3028 bp = bvec[i]; 3029 bp->b_flags &= ~(B_NEEDCOMMIT | B_CLUSTEROK); 3030 if (retv) { 3031 /* 3032 * Error, leave B_DELWRI intact 3033 */ 3034 vfs_unbusy_pages(bp); 3035 brelse(bp); 3036 } else { 3037 /* 3038 * Success, remove B_DELWRI ( bundirty() ). 3039 * 3040 * b_dirtyoff/b_dirtyend seem to be NFS 3041 * specific. We should probably move that 3042 * into bundirty(). XXX 3043 */ 3044 s = splbio(); 3045 bufobj_wref(&vp->v_bufobj); 3046 bp->b_flags |= B_ASYNC; 3047 bundirty(bp); 3048 bp->b_flags &= ~B_DONE; 3049 bp->b_ioflags &= ~BIO_ERROR; 3050 bp->b_dirtyoff = bp->b_dirtyend = 0; 3051 splx(s); 3052 bufdone(bp); 3053 } 3054 } 3055 } 3056 3057 /* 3058 * Start/do any write(s) that are required. 3059 */ 3060 loop: 3061 s = splbio(); 3062 VI_LOCK(vp); 3063 TAILQ_FOREACH_SAFE(bp, &vp->v_bufobj.bo_dirty.bv_hd, b_bobufs, nbp) { 3064 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT, NULL)) { 3065 if (waitfor != MNT_WAIT || passone) 3066 continue; 3067 3068 error = BUF_TIMELOCK(bp, 3069 LK_EXCLUSIVE | LK_SLEEPFAIL | LK_INTERLOCK, 3070 VI_MTX(vp), "nfsfsync", slpflag, slptimeo); 3071 splx(s); 3072 if (error == 0) { 3073 BUF_UNLOCK(bp); 3074 goto loop; 3075 } 3076 if (error == ENOLCK) 3077 goto loop; 3078 if (nfs_sigintr(nmp, NULL, td)) { 3079 error = EINTR; 3080 goto done; 3081 } 3082 if (slpflag == PCATCH) { 3083 slpflag = 0; 3084 slptimeo = 2 * hz; 3085 } 3086 goto loop; 3087 } 3088 if ((bp->b_flags & B_DELWRI) == 0) 3089 panic("nfs_fsync: not dirty"); 3090 if ((passone || !commit) && (bp->b_flags & B_NEEDCOMMIT)) { 3091 BUF_UNLOCK(bp); 3092 continue; 3093 } 3094 VI_UNLOCK(vp); 3095 bremfree(bp); 3096 if (passone || !commit) 3097 bp->b_flags |= B_ASYNC; 3098 else 3099 bp->b_flags |= B_ASYNC; 3100 splx(s); 3101 bwrite(bp); 3102 if (nfs_sigintr(nmp, NULL, td)) { 3103 error = EINTR; 3104 goto done; 3105 } 3106 goto loop; 3107 } 3108 splx(s); 3109 if (passone) { 3110 passone = 0; 3111 VI_UNLOCK(vp); 3112 goto again; 3113 } 3114 if (waitfor == MNT_WAIT) { 3115 while (vp->v_bufobj.bo_numoutput) { 3116 error = bufobj_wwait(&vp->v_bufobj, slpflag, slptimeo); 3117 if (error) { 3118 VI_UNLOCK(vp); 3119 error = nfs_sigintr(nmp, NULL, td); 3120 if (error) 3121 goto done; 3122 if (slpflag == PCATCH) { 3123 slpflag = 0; 3124 slptimeo = 2 * hz; 3125 } 3126 VI_LOCK(vp); 3127 } 3128 } 3129 if (vp->v_bufobj.bo_dirty.bv_cnt != 0 && commit) { 3130 VI_UNLOCK(vp); 3131 goto loop; 3132 } 3133 /* 3134 * Wait for all the async IO requests to drain 3135 */ 3136 VI_UNLOCK(vp); 3137 mtx_lock(&np->n_mtx); 3138 while (np->n_directio_asyncwr > 0) { 3139 np->n_flag |= NFSYNCWAIT; 3140 error = nfs_msleep(td, (caddr_t)&np->n_directio_asyncwr, 3141 &np->n_mtx, slpflag | (PRIBIO + 1), 3142 "nfsfsync", 0); 3143 if (error) { 3144 if (nfs_sigintr(nmp, (struct nfsreq *)0, td)) { 3145 mtx_unlock(&np->n_mtx); 3146 error = EINTR; 3147 goto done; 3148 } 3149 } 3150 } 3151 mtx_unlock(&np->n_mtx); 3152 } else 3153 VI_UNLOCK(vp); 3154 mtx_lock(&np->n_mtx); 3155 if (np->n_flag & NWRITEERR) { 3156 error = np->n_error; 3157 np->n_flag &= ~NWRITEERR; 3158 } 3159 if (commit && vp->v_bufobj.bo_dirty.bv_cnt == 0 && 3160 vp->v_bufobj.bo_numoutput == 0 && np->n_directio_asyncwr == 0) 3161 np->n_flag &= ~NMODIFIED; 3162 mtx_unlock(&np->n_mtx); 3163 done: 3164 if (bvec != NULL && bvec != bvec_on_stack) 3165 free(bvec, M_TEMP); 3166 return (error); 3167 } 3168 3169 /* 3170 * NFS advisory byte-level locks. 3171 */ 3172 static int 3173 nfs_advlock(struct vop_advlock_args *ap) 3174 { 3175 struct vnode *vp = ap->a_vp; 3176 u_quad_t size; 3177 int error; 3178 3179 error = vn_lock(vp, LK_SHARED, curthread); 3180 if (error) 3181 return (error); 3182 if ((VFSTONFS(vp->v_mount)->nm_flag & NFSMNT_NOLOCKD) != 0) { 3183 size = VTONFS(vp)->n_size; 3184 VOP_UNLOCK(vp, 0, curthread); 3185 error = lf_advlock(ap, &(vp->v_lockf), size); 3186 } else { 3187 if (nfs_advlock_p) 3188 error = nfs_advlock_p(ap); 3189 else 3190 error = ENOLCK; 3191 } 3192 3193 return (error); 3194 } 3195 3196 /* 3197 * NFS advisory byte-level locks. 3198 */ 3199 static int 3200 nfs_advlockasync(struct vop_advlockasync_args *ap) 3201 { 3202 struct vnode *vp = ap->a_vp; 3203 u_quad_t size; 3204 int error; 3205 3206 error = vn_lock(vp, LK_SHARED, curthread); 3207 if (error) 3208 return (error); 3209 if ((VFSTONFS(vp->v_mount)->nm_flag & NFSMNT_NOLOCKD) != 0) { 3210 size = VTONFS(vp)->n_size; 3211 VOP_UNLOCK(vp, 0, curthread); 3212 error = lf_advlockasync(ap, &(vp->v_lockf), size); 3213 } else { 3214 VOP_UNLOCK(vp, 0, curthread); 3215 error = EOPNOTSUPP; 3216 } 3217 return (error); 3218 } 3219 3220 /* 3221 * Print out the contents of an nfsnode. 3222 */ 3223 static int 3224 nfs_print(struct vop_print_args *ap) 3225 { 3226 struct vnode *vp = ap->a_vp; 3227 struct nfsnode *np = VTONFS(vp); 3228 3229 nfs_printf("\tfileid %ld fsid 0x%x", 3230 np->n_vattr.va_fileid, np->n_vattr.va_fsid); 3231 if (vp->v_type == VFIFO) 3232 fifo_printinfo(vp); 3233 printf("\n"); 3234 return (0); 3235 } 3236 3237 /* 3238 * This is the "real" nfs::bwrite(struct buf*). 3239 * We set B_CACHE if this is a VMIO buffer. 3240 */ 3241 int 3242 nfs_writebp(struct buf *bp, int force __unused, struct thread *td) 3243 { 3244 int s; 3245 int oldflags = bp->b_flags; 3246 #if 0 3247 int retv = 1; 3248 off_t off; 3249 #endif 3250 3251 if (BUF_REFCNT(bp) == 0) 3252 panic("bwrite: buffer is not locked???"); 3253 3254 if (bp->b_flags & B_INVAL) { 3255 brelse(bp); 3256 return(0); 3257 } 3258 3259 bp->b_flags |= B_CACHE; 3260 3261 /* 3262 * Undirty the bp. We will redirty it later if the I/O fails. 3263 */ 3264 3265 s = splbio(); 3266 bundirty(bp); 3267 bp->b_flags &= ~B_DONE; 3268 bp->b_ioflags &= ~BIO_ERROR; 3269 bp->b_iocmd = BIO_WRITE; 3270 3271 bufobj_wref(bp->b_bufobj); 3272 curthread->td_ru.ru_oublock++; 3273 splx(s); 3274 3275 /* 3276 * Note: to avoid loopback deadlocks, we do not 3277 * assign b_runningbufspace. 3278 */ 3279 vfs_busy_pages(bp, 1); 3280 3281 BUF_KERNPROC(bp); 3282 bp->b_iooffset = dbtob(bp->b_blkno); 3283 bstrategy(bp); 3284 3285 if( (oldflags & B_ASYNC) == 0) { 3286 int rtval = bufwait(bp); 3287 3288 if (oldflags & B_DELWRI) { 3289 s = splbio(); 3290 reassignbuf(bp); 3291 splx(s); 3292 } 3293 brelse(bp); 3294 return (rtval); 3295 } 3296 3297 return (0); 3298 } 3299 3300 /* 3301 * nfs special file access vnode op. 3302 * Essentially just get vattr and then imitate iaccess() since the device is 3303 * local to the client. 3304 */ 3305 static int 3306 nfsspec_access(struct vop_access_args *ap) 3307 { 3308 struct vattr *vap; 3309 struct ucred *cred = ap->a_cred; 3310 struct vnode *vp = ap->a_vp; 3311 mode_t mode = ap->a_mode; 3312 struct vattr vattr; 3313 int error; 3314 3315 /* 3316 * Disallow write attempts on filesystems mounted read-only; 3317 * unless the file is a socket, fifo, or a block or character 3318 * device resident on the filesystem. 3319 */ 3320 if ((mode & VWRITE) && (vp->v_mount->mnt_flag & MNT_RDONLY)) { 3321 switch (vp->v_type) { 3322 case VREG: 3323 case VDIR: 3324 case VLNK: 3325 return (EROFS); 3326 default: 3327 break; 3328 } 3329 } 3330 vap = &vattr; 3331 error = VOP_GETATTR(vp, vap, cred, ap->a_td); 3332 if (error) 3333 goto out; 3334 error = vaccess(vp->v_type, vap->va_mode, vap->va_uid, vap->va_gid, 3335 mode, cred, NULL); 3336 out: 3337 return error; 3338 } 3339 3340 /* 3341 * Read wrapper for fifos. 3342 */ 3343 static int 3344 nfsfifo_read(struct vop_read_args *ap) 3345 { 3346 struct nfsnode *np = VTONFS(ap->a_vp); 3347 int error; 3348 3349 /* 3350 * Set access flag. 3351 */ 3352 mtx_lock(&np->n_mtx); 3353 np->n_flag |= NACC; 3354 getnanotime(&np->n_atim); 3355 mtx_unlock(&np->n_mtx); 3356 error = fifo_specops.vop_read(ap); 3357 return error; 3358 } 3359 3360 /* 3361 * Write wrapper for fifos. 3362 */ 3363 static int 3364 nfsfifo_write(struct vop_write_args *ap) 3365 { 3366 struct nfsnode *np = VTONFS(ap->a_vp); 3367 3368 /* 3369 * Set update flag. 3370 */ 3371 mtx_lock(&np->n_mtx); 3372 np->n_flag |= NUPD; 3373 getnanotime(&np->n_mtim); 3374 mtx_unlock(&np->n_mtx); 3375 return(fifo_specops.vop_write(ap)); 3376 } 3377 3378 /* 3379 * Close wrapper for fifos. 3380 * 3381 * Update the times on the nfsnode then do fifo close. 3382 */ 3383 static int 3384 nfsfifo_close(struct vop_close_args *ap) 3385 { 3386 struct vnode *vp = ap->a_vp; 3387 struct nfsnode *np = VTONFS(vp); 3388 struct vattr vattr; 3389 struct timespec ts; 3390 3391 mtx_lock(&np->n_mtx); 3392 if (np->n_flag & (NACC | NUPD)) { 3393 getnanotime(&ts); 3394 if (np->n_flag & NACC) 3395 np->n_atim = ts; 3396 if (np->n_flag & NUPD) 3397 np->n_mtim = ts; 3398 np->n_flag |= NCHG; 3399 if (vrefcnt(vp) == 1 && 3400 (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) { 3401 VATTR_NULL(&vattr); 3402 if (np->n_flag & NACC) 3403 vattr.va_atime = np->n_atim; 3404 if (np->n_flag & NUPD) 3405 vattr.va_mtime = np->n_mtim; 3406 mtx_unlock(&np->n_mtx); 3407 (void)VOP_SETATTR(vp, &vattr, ap->a_cred, ap->a_td); 3408 goto out; 3409 } 3410 } 3411 mtx_unlock(&np->n_mtx); 3412 out: 3413 return (fifo_specops.vop_close(ap)); 3414 } 3415 3416 /* 3417 * Just call nfs_writebp() with the force argument set to 1. 3418 * 3419 * NOTE: B_DONE may or may not be set in a_bp on call. 3420 */ 3421 static int 3422 nfs_bwrite(struct buf *bp) 3423 { 3424 3425 return (nfs_writebp(bp, 1, curthread)); 3426 } 3427 3428 struct buf_ops buf_ops_nfs = { 3429 .bop_name = "buf_ops_nfs", 3430 .bop_write = nfs_bwrite, 3431 .bop_strategy = bufstrategy, 3432 .bop_sync = bufsync, 3433 .bop_bdflush = bufbdflush, 3434 };
Cache object: 620de813945e95065d9a5d664959a3d0
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