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sys/nfsclient/nfs_subs.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_subs.c 8.8 (Berkeley) 5/22/95 33 */ 34 35 #include <sys/cdefs.h> 36 __FBSDID("$FreeBSD: releng/6.0/sys/nfsclient/nfs_subs.c 143510 2005-03-13 12:14:56Z jeff $"); 37 38 /* 39 * These functions support the macros and help fiddle mbuf chains for 40 * the nfs op functions. They do things like create the rpc header and 41 * copy data between mbuf chains and uio lists. 42 */ 43 44 #include <sys/param.h> 45 #include <sys/systm.h> 46 #include <sys/kernel.h> 47 #include <sys/bio.h> 48 #include <sys/buf.h> 49 #include <sys/proc.h> 50 #include <sys/mount.h> 51 #include <sys/vnode.h> 52 #include <sys/namei.h> 53 #include <sys/mbuf.h> 54 #include <sys/socket.h> 55 #include <sys/stat.h> 56 #include <sys/malloc.h> 57 #include <sys/sysent.h> 58 #include <sys/syscall.h> 59 #include <sys/sysproto.h> 60 61 #include <vm/vm.h> 62 #include <vm/vm_object.h> 63 #include <vm/vm_extern.h> 64 #include <vm/uma.h> 65 66 #include <rpc/rpcclnt.h> 67 68 #include <nfs/rpcv2.h> 69 #include <nfs/nfsproto.h> 70 #include <nfsclient/nfs.h> 71 #include <nfsclient/nfsnode.h> 72 #include <nfs/xdr_subs.h> 73 #include <nfsclient/nfsm_subs.h> 74 #include <nfsclient/nfsmount.h> 75 76 #include <netinet/in.h> 77 78 /* 79 * Data items converted to xdr at startup, since they are constant 80 * This is kinda hokey, but may save a little time doing byte swaps 81 */ 82 u_int32_t nfs_xdrneg1; 83 u_int32_t rpc_call, rpc_vers, rpc_reply, rpc_msgdenied, rpc_autherr, 84 rpc_mismatch, rpc_auth_unix, rpc_msgaccepted; 85 u_int32_t nfs_true, nfs_false; 86 87 /* And other global data */ 88 static u_int32_t nfs_xid = 0; 89 static enum vtype nv2tov_type[8]= { 90 VNON, VREG, VDIR, VBLK, VCHR, VLNK, VNON, VNON 91 }; 92 93 int nfs_ticks; 94 int nfs_pbuf_freecnt = -1; /* start out unlimited */ 95 96 struct nfs_reqq nfs_reqq; 97 struct mtx nfs_reqq_mtx; 98 struct mtx nfs_reply_mtx; 99 struct nfs_bufq nfs_bufq; 100 101 /* 102 * and the reverse mapping from generic to Version 2 procedure numbers 103 */ 104 int nfsv2_procid[NFS_NPROCS] = { 105 NFSV2PROC_NULL, 106 NFSV2PROC_GETATTR, 107 NFSV2PROC_SETATTR, 108 NFSV2PROC_LOOKUP, 109 NFSV2PROC_NOOP, 110 NFSV2PROC_READLINK, 111 NFSV2PROC_READ, 112 NFSV2PROC_WRITE, 113 NFSV2PROC_CREATE, 114 NFSV2PROC_MKDIR, 115 NFSV2PROC_SYMLINK, 116 NFSV2PROC_CREATE, 117 NFSV2PROC_REMOVE, 118 NFSV2PROC_RMDIR, 119 NFSV2PROC_RENAME, 120 NFSV2PROC_LINK, 121 NFSV2PROC_READDIR, 122 NFSV2PROC_NOOP, 123 NFSV2PROC_STATFS, 124 NFSV2PROC_NOOP, 125 NFSV2PROC_NOOP, 126 NFSV2PROC_NOOP, 127 NFSV2PROC_NOOP, 128 }; 129 130 LIST_HEAD(nfsnodehashhead, nfsnode); 131 132 /* 133 * Create the header for an rpc request packet 134 * The hsiz is the size of the rest of the nfs request header. 135 * (just used to decide if a cluster is a good idea) 136 */ 137 struct mbuf * 138 nfsm_reqhead(struct vnode *vp, u_long procid, int hsiz) 139 { 140 struct mbuf *mb; 141 142 MGET(mb, M_TRYWAIT, MT_DATA); 143 if (hsiz >= MINCLSIZE) 144 MCLGET(mb, M_TRYWAIT); 145 mb->m_len = 0; 146 return (mb); 147 } 148 149 /* 150 * Build the RPC header and fill in the authorization info. 151 * The authorization string argument is only used when the credentials 152 * come from outside of the kernel. 153 * Returns the head of the mbuf list. 154 */ 155 struct mbuf * 156 nfsm_rpchead(struct ucred *cr, int nmflag, int procid, int auth_type, 157 int auth_len, struct mbuf *mrest, int mrest_len, struct mbuf **mbp, 158 u_int32_t *xidp) 159 { 160 struct mbuf *mb; 161 u_int32_t *tl; 162 caddr_t bpos; 163 int i; 164 struct mbuf *mreq; 165 int grpsiz, authsiz; 166 167 authsiz = nfsm_rndup(auth_len); 168 MGETHDR(mb, M_TRYWAIT, MT_DATA); 169 if ((authsiz + 10 * NFSX_UNSIGNED) >= MINCLSIZE) { 170 MCLGET(mb, M_TRYWAIT); 171 } else if ((authsiz + 10 * NFSX_UNSIGNED) < MHLEN) { 172 MH_ALIGN(mb, authsiz + 10 * NFSX_UNSIGNED); 173 } else { 174 MH_ALIGN(mb, 8 * NFSX_UNSIGNED); 175 } 176 mb->m_len = 0; 177 mreq = mb; 178 bpos = mtod(mb, caddr_t); 179 180 /* 181 * First the RPC header. 182 */ 183 tl = nfsm_build(u_int32_t *, 8 * NFSX_UNSIGNED); 184 185 /* Get a pretty random xid to start with */ 186 if (!nfs_xid) 187 nfs_xid = random(); 188 /* 189 * Skip zero xid if it should ever happen. 190 */ 191 if (++nfs_xid == 0) 192 nfs_xid++; 193 194 *tl++ = *xidp = txdr_unsigned(nfs_xid); 195 *tl++ = rpc_call; 196 *tl++ = rpc_vers; 197 *tl++ = txdr_unsigned(NFS_PROG); 198 if (nmflag & NFSMNT_NFSV3) { 199 *tl++ = txdr_unsigned(NFS_VER3); 200 *tl++ = txdr_unsigned(procid); 201 } else { 202 *tl++ = txdr_unsigned(NFS_VER2); 203 *tl++ = txdr_unsigned(nfsv2_procid[procid]); 204 } 205 206 /* 207 * And then the authorization cred. 208 */ 209 *tl++ = txdr_unsigned(auth_type); 210 *tl = txdr_unsigned(authsiz); 211 switch (auth_type) { 212 case RPCAUTH_UNIX: 213 tl = nfsm_build(u_int32_t *, auth_len); 214 *tl++ = 0; /* stamp ?? */ 215 *tl++ = 0; /* NULL hostname */ 216 *tl++ = txdr_unsigned(cr->cr_uid); 217 *tl++ = txdr_unsigned(cr->cr_groups[0]); 218 grpsiz = (auth_len >> 2) - 5; 219 *tl++ = txdr_unsigned(grpsiz); 220 for (i = 1; i <= grpsiz; i++) 221 *tl++ = txdr_unsigned(cr->cr_groups[i]); 222 break; 223 } 224 225 /* 226 * And the verifier... 227 */ 228 tl = nfsm_build(u_int32_t *, 2 * NFSX_UNSIGNED); 229 *tl++ = txdr_unsigned(RPCAUTH_NULL); 230 *tl = 0; 231 mb->m_next = mrest; 232 mreq->m_pkthdr.len = authsiz + 10 * NFSX_UNSIGNED + mrest_len; 233 mreq->m_pkthdr.rcvif = NULL; 234 *mbp = mb; 235 return (mreq); 236 } 237 238 /* 239 * copies a uio scatter/gather list to an mbuf chain. 240 * NOTE: can ony handle iovcnt == 1 241 */ 242 int 243 nfsm_uiotombuf(struct uio *uiop, struct mbuf **mq, int siz, caddr_t *bpos) 244 { 245 char *uiocp; 246 struct mbuf *mp, *mp2; 247 int xfer, left, mlen; 248 int uiosiz, clflg, rem; 249 char *cp; 250 251 #ifdef DIAGNOSTIC 252 if (uiop->uio_iovcnt != 1) 253 panic("nfsm_uiotombuf: iovcnt != 1"); 254 #endif 255 256 if (siz > MLEN) /* or should it >= MCLBYTES ?? */ 257 clflg = 1; 258 else 259 clflg = 0; 260 rem = nfsm_rndup(siz)-siz; 261 mp = mp2 = *mq; 262 while (siz > 0) { 263 left = uiop->uio_iov->iov_len; 264 uiocp = uiop->uio_iov->iov_base; 265 if (left > siz) 266 left = siz; 267 uiosiz = left; 268 while (left > 0) { 269 mlen = M_TRAILINGSPACE(mp); 270 if (mlen == 0) { 271 MGET(mp, M_TRYWAIT, MT_DATA); 272 if (clflg) 273 MCLGET(mp, M_TRYWAIT); 274 mp->m_len = 0; 275 mp2->m_next = mp; 276 mp2 = mp; 277 mlen = M_TRAILINGSPACE(mp); 278 } 279 xfer = (left > mlen) ? mlen : left; 280 #ifdef notdef 281 /* Not Yet.. */ 282 if (uiop->uio_iov->iov_op != NULL) 283 (*(uiop->uio_iov->iov_op)) 284 (uiocp, mtod(mp, caddr_t)+mp->m_len, xfer); 285 else 286 #endif 287 if (uiop->uio_segflg == UIO_SYSSPACE) 288 bcopy(uiocp, mtod(mp, caddr_t)+mp->m_len, xfer); 289 else 290 copyin(uiocp, mtod(mp, caddr_t)+mp->m_len, xfer); 291 mp->m_len += xfer; 292 left -= xfer; 293 uiocp += xfer; 294 uiop->uio_offset += xfer; 295 uiop->uio_resid -= xfer; 296 } 297 uiop->uio_iov->iov_base = 298 (char *)uiop->uio_iov->iov_base + uiosiz; 299 uiop->uio_iov->iov_len -= uiosiz; 300 siz -= uiosiz; 301 } 302 if (rem > 0) { 303 if (rem > M_TRAILINGSPACE(mp)) { 304 MGET(mp, M_TRYWAIT, MT_DATA); 305 mp->m_len = 0; 306 mp2->m_next = mp; 307 } 308 cp = mtod(mp, caddr_t)+mp->m_len; 309 for (left = 0; left < rem; left++) 310 *cp++ = '\0'; 311 mp->m_len += rem; 312 *bpos = cp; 313 } else 314 *bpos = mtod(mp, caddr_t)+mp->m_len; 315 *mq = mp; 316 return (0); 317 } 318 319 /* 320 * Copy a string into mbufs for the hard cases... 321 */ 322 int 323 nfsm_strtmbuf(struct mbuf **mb, char **bpos, const char *cp, long siz) 324 { 325 struct mbuf *m1 = NULL, *m2; 326 long left, xfer, len, tlen; 327 u_int32_t *tl; 328 int putsize; 329 330 putsize = 1; 331 m2 = *mb; 332 left = M_TRAILINGSPACE(m2); 333 if (left > 0) { 334 tl = ((u_int32_t *)(*bpos)); 335 *tl++ = txdr_unsigned(siz); 336 putsize = 0; 337 left -= NFSX_UNSIGNED; 338 m2->m_len += NFSX_UNSIGNED; 339 if (left > 0) { 340 bcopy(cp, (caddr_t) tl, left); 341 siz -= left; 342 cp += left; 343 m2->m_len += left; 344 left = 0; 345 } 346 } 347 /* Loop around adding mbufs */ 348 while (siz > 0) { 349 MGET(m1, M_TRYWAIT, MT_DATA); 350 if (siz > MLEN) 351 MCLGET(m1, M_TRYWAIT); 352 m1->m_len = NFSMSIZ(m1); 353 m2->m_next = m1; 354 m2 = m1; 355 tl = mtod(m1, u_int32_t *); 356 tlen = 0; 357 if (putsize) { 358 *tl++ = txdr_unsigned(siz); 359 m1->m_len -= NFSX_UNSIGNED; 360 tlen = NFSX_UNSIGNED; 361 putsize = 0; 362 } 363 if (siz < m1->m_len) { 364 len = nfsm_rndup(siz); 365 xfer = siz; 366 if (xfer < len) 367 *(tl+(xfer>>2)) = 0; 368 } else { 369 xfer = len = m1->m_len; 370 } 371 bcopy(cp, (caddr_t) tl, xfer); 372 m1->m_len = len+tlen; 373 siz -= xfer; 374 cp += xfer; 375 } 376 *mb = m1; 377 *bpos = mtod(m1, caddr_t)+m1->m_len; 378 return (0); 379 } 380 381 /* 382 * Called once to initialize data structures... 383 */ 384 int 385 nfs_init(struct vfsconf *vfsp) 386 { 387 int i; 388 389 nfsmount_zone = uma_zcreate("NFSMOUNT", sizeof(struct nfsmount), 390 NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0); 391 rpc_vers = txdr_unsigned(RPC_VER2); 392 rpc_call = txdr_unsigned(RPC_CALL); 393 rpc_reply = txdr_unsigned(RPC_REPLY); 394 rpc_msgdenied = txdr_unsigned(RPC_MSGDENIED); 395 rpc_msgaccepted = txdr_unsigned(RPC_MSGACCEPTED); 396 rpc_mismatch = txdr_unsigned(RPC_MISMATCH); 397 rpc_autherr = txdr_unsigned(RPC_AUTHERR); 398 rpc_auth_unix = txdr_unsigned(RPCAUTH_UNIX); 399 nfs_true = txdr_unsigned(TRUE); 400 nfs_false = txdr_unsigned(FALSE); 401 nfs_xdrneg1 = txdr_unsigned(-1); 402 nfs_ticks = (hz * NFS_TICKINTVL + 500) / 1000; 403 if (nfs_ticks < 1) 404 nfs_ticks = 1; 405 /* Ensure async daemons disabled */ 406 for (i = 0; i < NFS_MAXASYNCDAEMON; i++) { 407 nfs_iodwant[i] = NULL; 408 nfs_iodmount[i] = NULL; 409 } 410 nfs_nhinit(); /* Init the nfsnode table */ 411 412 /* 413 * Initialize reply list and start timer 414 */ 415 TAILQ_INIT(&nfs_reqq); 416 callout_init(&nfs_callout, 0); 417 mtx_init(&nfs_reqq_mtx, "NFS reqq lock", NULL, MTX_DEF); 418 mtx_init(&nfs_reply_mtx, "Synch NFS reply posting", NULL, MTX_DEF); 419 420 nfs_pbuf_freecnt = nswbuf / 2 + 1; 421 422 return (0); 423 } 424 425 int 426 nfs_uninit(struct vfsconf *vfsp) 427 { 428 int i; 429 430 callout_stop(&nfs_callout); 431 432 KASSERT(TAILQ_EMPTY(&nfs_reqq), 433 ("nfs_uninit: request queue not empty")); 434 435 /* 436 * Tell all nfsiod processes to exit. Clear nfs_iodmax, and wakeup 437 * any sleeping nfsiods so they check nfs_iodmax and exit. 438 */ 439 nfs_iodmax = 0; 440 for (i = 0; i < nfs_numasync; i++) 441 if (nfs_iodwant[i]) 442 wakeup(&nfs_iodwant[i]); 443 /* The last nfsiod to exit will wake us up when nfs_numasync hits 0 */ 444 while (nfs_numasync) 445 tsleep(&nfs_numasync, PWAIT, "ioddie", 0); 446 447 nfs_nhuninit(); 448 uma_zdestroy(nfsmount_zone); 449 return (0); 450 } 451 452 /* 453 * Attribute cache routines. 454 * nfs_loadattrcache() - loads or updates the cache contents from attributes 455 * that are on the mbuf list 456 * nfs_getattrcache() - returns valid attributes if found in cache, returns 457 * error otherwise 458 */ 459 460 /* 461 * Load the attribute cache (that lives in the nfsnode entry) with 462 * the values on the mbuf list and 463 * Iff vap not NULL 464 * copy the attributes to *vaper 465 */ 466 int 467 nfs_loadattrcache(struct vnode **vpp, struct mbuf **mdp, caddr_t *dposp, 468 struct vattr *vaper, int dontshrink) 469 { 470 struct vnode *vp = *vpp; 471 struct vattr *vap; 472 struct nfs_fattr *fp; 473 struct nfsnode *np; 474 int32_t t1; 475 caddr_t cp2; 476 int rdev; 477 struct mbuf *md; 478 enum vtype vtyp; 479 u_short vmode; 480 struct timespec mtime; 481 int v3 = NFS_ISV3(vp); 482 483 md = *mdp; 484 t1 = (mtod(md, caddr_t) + md->m_len) - *dposp; 485 cp2 = nfsm_disct(mdp, dposp, NFSX_FATTR(v3), t1, M_TRYWAIT); 486 if (cp2 == NULL) 487 return EBADRPC; 488 fp = (struct nfs_fattr *)cp2; 489 if (v3) { 490 vtyp = nfsv3tov_type(fp->fa_type); 491 vmode = fxdr_unsigned(u_short, fp->fa_mode); 492 rdev = makedev(fxdr_unsigned(int, fp->fa3_rdev.specdata1), 493 fxdr_unsigned(int, fp->fa3_rdev.specdata2)); 494 fxdr_nfsv3time(&fp->fa3_mtime, &mtime); 495 } else { 496 vtyp = nfsv2tov_type(fp->fa_type); 497 vmode = fxdr_unsigned(u_short, fp->fa_mode); 498 /* 499 * XXX 500 * 501 * The duplicate information returned in fa_type and fa_mode 502 * is an ambiguity in the NFS version 2 protocol. 503 * 504 * VREG should be taken literally as a regular file. If a 505 * server intents to return some type information differently 506 * in the upper bits of the mode field (e.g. for sockets, or 507 * FIFOs), NFSv2 mandates fa_type to be VNON. Anyway, we 508 * leave the examination of the mode bits even in the VREG 509 * case to avoid breakage for bogus servers, but we make sure 510 * that there are actually type bits set in the upper part of 511 * fa_mode (and failing that, trust the va_type field). 512 * 513 * NFSv3 cleared the issue, and requires fa_mode to not 514 * contain any type information (while also introduing sockets 515 * and FIFOs for fa_type). 516 */ 517 if (vtyp == VNON || (vtyp == VREG && (vmode & S_IFMT) != 0)) 518 vtyp = IFTOVT(vmode); 519 rdev = fxdr_unsigned(int32_t, fp->fa2_rdev); 520 fxdr_nfsv2time(&fp->fa2_mtime, &mtime); 521 522 /* 523 * Really ugly NFSv2 kludge. 524 */ 525 if (vtyp == VCHR && rdev == 0xffffffff) 526 vtyp = VFIFO; 527 } 528 529 /* 530 * If v_type == VNON it is a new node, so fill in the v_type, 531 * n_mtime fields. Check to see if it represents a special 532 * device, and if so, check for a possible alias. Once the 533 * correct vnode has been obtained, fill in the rest of the 534 * information. 535 */ 536 np = VTONFS(vp); 537 if (vp->v_type != vtyp) { 538 vp->v_type = vtyp; 539 if (vp->v_type == VFIFO) 540 vp->v_op = &nfs_fifoops; 541 np->n_mtime = mtime; 542 } 543 vap = &np->n_vattr; 544 vap->va_type = vtyp; 545 vap->va_mode = (vmode & 07777); 546 vap->va_rdev = rdev; 547 vap->va_mtime = mtime; 548 vap->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0]; 549 if (v3) { 550 vap->va_nlink = fxdr_unsigned(u_short, fp->fa_nlink); 551 vap->va_uid = fxdr_unsigned(uid_t, fp->fa_uid); 552 vap->va_gid = fxdr_unsigned(gid_t, fp->fa_gid); 553 vap->va_size = fxdr_hyper(&fp->fa3_size); 554 vap->va_blocksize = NFS_FABLKSIZE; 555 vap->va_bytes = fxdr_hyper(&fp->fa3_used); 556 vap->va_fileid = fxdr_unsigned(int32_t, 557 fp->fa3_fileid.nfsuquad[1]); 558 fxdr_nfsv3time(&fp->fa3_atime, &vap->va_atime); 559 fxdr_nfsv3time(&fp->fa3_ctime, &vap->va_ctime); 560 vap->va_flags = 0; 561 vap->va_filerev = 0; 562 } else { 563 vap->va_nlink = fxdr_unsigned(u_short, fp->fa_nlink); 564 vap->va_uid = fxdr_unsigned(uid_t, fp->fa_uid); 565 vap->va_gid = fxdr_unsigned(gid_t, fp->fa_gid); 566 vap->va_size = fxdr_unsigned(u_int32_t, fp->fa2_size); 567 vap->va_blocksize = fxdr_unsigned(int32_t, fp->fa2_blocksize); 568 vap->va_bytes = (u_quad_t)fxdr_unsigned(int32_t, fp->fa2_blocks) 569 * NFS_FABLKSIZE; 570 vap->va_fileid = fxdr_unsigned(int32_t, fp->fa2_fileid); 571 fxdr_nfsv2time(&fp->fa2_atime, &vap->va_atime); 572 vap->va_flags = 0; 573 vap->va_ctime.tv_sec = fxdr_unsigned(u_int32_t, 574 fp->fa2_ctime.nfsv2_sec); 575 vap->va_ctime.tv_nsec = 0; 576 vap->va_gen = fxdr_unsigned(u_int32_t, fp->fa2_ctime.nfsv2_usec); 577 vap->va_filerev = 0; 578 } 579 np->n_attrstamp = time_second; 580 if (vap->va_size != np->n_size) { 581 if (vap->va_type == VREG) { 582 if (dontshrink && vap->va_size < np->n_size) { 583 /* 584 * We've been told not to shrink the file; 585 * zero np->n_attrstamp to indicate that 586 * the attributes are stale. 587 */ 588 vap->va_size = np->n_size; 589 np->n_attrstamp = 0; 590 } else if (np->n_flag & NMODIFIED) { 591 /* 592 * We've modified the file: Use the larger 593 * of our size, and the server's size. 594 */ 595 if (vap->va_size < np->n_size) { 596 vap->va_size = np->n_size; 597 } else { 598 np->n_size = vap->va_size; 599 np->n_flag |= NSIZECHANGED; 600 } 601 } else { 602 np->n_size = vap->va_size; 603 np->n_flag |= NSIZECHANGED; 604 } 605 vnode_pager_setsize(vp, np->n_size); 606 } else { 607 np->n_size = vap->va_size; 608 } 609 } 610 if (vaper != NULL) { 611 bcopy((caddr_t)vap, (caddr_t)vaper, sizeof(*vap)); 612 if (np->n_flag & NCHG) { 613 if (np->n_flag & NACC) 614 vaper->va_atime = np->n_atim; 615 if (np->n_flag & NUPD) 616 vaper->va_mtime = np->n_mtim; 617 } 618 } 619 return (0); 620 } 621 622 #ifdef NFS_ACDEBUG 623 #include <sys/sysctl.h> 624 SYSCTL_DECL(_vfs_nfs); 625 static int nfs_acdebug; 626 SYSCTL_INT(_vfs_nfs, OID_AUTO, acdebug, CTLFLAG_RW, &nfs_acdebug, 0, ""); 627 #endif 628 629 /* 630 * Check the time stamp 631 * If the cache is valid, copy contents to *vap and return 0 632 * otherwise return an error 633 */ 634 int 635 nfs_getattrcache(struct vnode *vp, struct vattr *vaper) 636 { 637 struct nfsnode *np; 638 struct vattr *vap; 639 struct nfsmount *nmp; 640 int timeo; 641 642 np = VTONFS(vp); 643 vap = &np->n_vattr; 644 nmp = VFSTONFS(vp->v_mount); 645 /* XXX n_mtime doesn't seem to be updated on a miss-and-reload */ 646 timeo = (time_second - np->n_mtime.tv_sec) / 10; 647 648 #ifdef NFS_ACDEBUG 649 if (nfs_acdebug>1) 650 printf("nfs_getattrcache: initial timeo = %d\n", timeo); 651 #endif 652 653 if (vap->va_type == VDIR) { 654 if ((np->n_flag & NMODIFIED) || timeo < nmp->nm_acdirmin) 655 timeo = nmp->nm_acdirmin; 656 else if (timeo > nmp->nm_acdirmax) 657 timeo = nmp->nm_acdirmax; 658 } else { 659 if ((np->n_flag & NMODIFIED) || timeo < nmp->nm_acregmin) 660 timeo = nmp->nm_acregmin; 661 else if (timeo > nmp->nm_acregmax) 662 timeo = nmp->nm_acregmax; 663 } 664 665 #ifdef NFS_ACDEBUG 666 if (nfs_acdebug > 2) 667 printf("acregmin %d; acregmax %d; acdirmin %d; acdirmax %d\n", 668 nmp->nm_acregmin, nmp->nm_acregmax, 669 nmp->nm_acdirmin, nmp->nm_acdirmax); 670 671 if (nfs_acdebug) 672 printf("nfs_getattrcache: age = %d; final timeo = %d\n", 673 (time_second - np->n_attrstamp), timeo); 674 #endif 675 676 if ((time_second - np->n_attrstamp) >= timeo) { 677 nfsstats.attrcache_misses++; 678 return (ENOENT); 679 } 680 nfsstats.attrcache_hits++; 681 if (vap->va_size != np->n_size) { 682 if (vap->va_type == VREG) { 683 if (np->n_flag & NMODIFIED) { 684 if (vap->va_size < np->n_size) 685 vap->va_size = np->n_size; 686 else 687 np->n_size = vap->va_size; 688 } else { 689 np->n_size = vap->va_size; 690 } 691 vnode_pager_setsize(vp, np->n_size); 692 } else { 693 np->n_size = vap->va_size; 694 } 695 } 696 bcopy((caddr_t)vap, (caddr_t)vaper, sizeof(struct vattr)); 697 if (np->n_flag & NCHG) { 698 if (np->n_flag & NACC) 699 vaper->va_atime = np->n_atim; 700 if (np->n_flag & NUPD) 701 vaper->va_mtime = np->n_mtim; 702 } 703 return (0); 704 } 705 706 static nfsuint64 nfs_nullcookie = { { 0, 0 } }; 707 /* 708 * This function finds the directory cookie that corresponds to the 709 * logical byte offset given. 710 */ 711 nfsuint64 * 712 nfs_getcookie(struct nfsnode *np, off_t off, int add) 713 { 714 struct nfsdmap *dp, *dp2; 715 int pos; 716 717 pos = (uoff_t)off / NFS_DIRBLKSIZ; 718 if (pos == 0 || off < 0) { 719 #ifdef DIAGNOSTIC 720 if (add) 721 panic("nfs getcookie add at <= 0"); 722 #endif 723 return (&nfs_nullcookie); 724 } 725 pos--; 726 dp = LIST_FIRST(&np->n_cookies); 727 if (!dp) { 728 if (add) { 729 MALLOC(dp, struct nfsdmap *, sizeof (struct nfsdmap), 730 M_NFSDIROFF, M_WAITOK); 731 dp->ndm_eocookie = 0; 732 LIST_INSERT_HEAD(&np->n_cookies, dp, ndm_list); 733 } else 734 return (NULL); 735 } 736 while (pos >= NFSNUMCOOKIES) { 737 pos -= NFSNUMCOOKIES; 738 if (LIST_NEXT(dp, ndm_list)) { 739 if (!add && dp->ndm_eocookie < NFSNUMCOOKIES && 740 pos >= dp->ndm_eocookie) 741 return (NULL); 742 dp = LIST_NEXT(dp, ndm_list); 743 } else if (add) { 744 MALLOC(dp2, struct nfsdmap *, sizeof (struct nfsdmap), 745 M_NFSDIROFF, M_WAITOK); 746 dp2->ndm_eocookie = 0; 747 LIST_INSERT_AFTER(dp, dp2, ndm_list); 748 dp = dp2; 749 } else 750 return (NULL); 751 } 752 if (pos >= dp->ndm_eocookie) { 753 if (add) 754 dp->ndm_eocookie = pos + 1; 755 else 756 return (NULL); 757 } 758 return (&dp->ndm_cookies[pos]); 759 } 760 761 /* 762 * Invalidate cached directory information, except for the actual directory 763 * blocks (which are invalidated separately). 764 * Done mainly to avoid the use of stale offset cookies. 765 */ 766 void 767 nfs_invaldir(struct vnode *vp) 768 { 769 struct nfsnode *np = VTONFS(vp); 770 771 #ifdef DIAGNOSTIC 772 if (vp->v_type != VDIR) 773 panic("nfs: invaldir not dir"); 774 #endif 775 np->n_direofoffset = 0; 776 np->n_cookieverf.nfsuquad[0] = 0; 777 np->n_cookieverf.nfsuquad[1] = 0; 778 if (LIST_FIRST(&np->n_cookies)) 779 LIST_FIRST(&np->n_cookies)->ndm_eocookie = 0; 780 } 781 782 /* 783 * The write verifier has changed (probably due to a server reboot), so all 784 * B_NEEDCOMMIT blocks will have to be written again. Since they are on the 785 * dirty block list as B_DELWRI, all this takes is clearing the B_NEEDCOMMIT 786 * and B_CLUSTEROK flags. Once done the new write verifier can be set for the 787 * mount point. 788 * 789 * B_CLUSTEROK must be cleared along with B_NEEDCOMMIT because stage 1 data 790 * writes are not clusterable. 791 */ 792 void 793 nfs_clearcommit(struct mount *mp) 794 { 795 struct vnode *vp, *nvp; 796 struct buf *bp, *nbp; 797 int s; 798 799 GIANT_REQUIRED; 800 801 s = splbio(); 802 MNT_ILOCK(mp); 803 MNT_VNODE_FOREACH(vp, mp, nvp) { 804 VI_LOCK(vp); 805 if (vp->v_iflag & VI_DOOMED) { 806 VI_UNLOCK(vp); 807 continue; 808 } 809 MNT_IUNLOCK(mp); 810 TAILQ_FOREACH_SAFE(bp, &vp->v_bufobj.bo_dirty.bv_hd, b_bobufs, nbp) { 811 if (BUF_REFCNT(bp) == 0 && 812 (bp->b_flags & (B_DELWRI | B_NEEDCOMMIT)) 813 == (B_DELWRI | B_NEEDCOMMIT)) 814 bp->b_flags &= ~(B_NEEDCOMMIT | B_CLUSTEROK); 815 } 816 VI_UNLOCK(vp); 817 MNT_ILOCK(mp); 818 } 819 MNT_IUNLOCK(mp); 820 splx(s); 821 } 822 823 /* 824 * Helper functions for former macros. Some of these should be 825 * moved to their callers. 826 */ 827 828 int 829 nfsm_mtofh_xx(struct vnode *d, struct vnode **v, int v3, int *f, 830 struct mbuf **md, caddr_t *dpos) 831 { 832 struct nfsnode *ttnp; 833 struct vnode *ttvp; 834 nfsfh_t *ttfhp; 835 u_int32_t *tl; 836 int ttfhsize; 837 int t1; 838 839 if (v3) { 840 tl = nfsm_dissect_xx(NFSX_UNSIGNED, md, dpos); 841 if (tl == NULL) 842 return EBADRPC; 843 *f = fxdr_unsigned(int, *tl); 844 } else 845 *f = 1; 846 if (*f) { 847 t1 = nfsm_getfh_xx(&ttfhp, &ttfhsize, (v3), md, dpos); 848 if (t1 != 0) 849 return t1; 850 t1 = nfs_nget(d->v_mount, ttfhp, ttfhsize, &ttnp); 851 if (t1 != 0) 852 return t1; 853 *v = NFSTOV(ttnp); 854 } 855 if (v3) { 856 tl = nfsm_dissect_xx(NFSX_UNSIGNED, md, dpos); 857 if (tl == NULL) 858 return EBADRPC; 859 if (*f) 860 *f = fxdr_unsigned(int, *tl); 861 else if (fxdr_unsigned(int, *tl)) 862 nfsm_adv_xx(NFSX_V3FATTR, md, dpos); 863 } 864 if (*f) { 865 ttvp = *v; 866 t1 = nfs_loadattrcache(&ttvp, md, dpos, NULL, 0); 867 if (t1) 868 return t1; 869 *v = ttvp; 870 } 871 return 0; 872 } 873 874 int 875 nfsm_getfh_xx(nfsfh_t **f, int *s, int v3, struct mbuf **md, caddr_t *dpos) 876 { 877 u_int32_t *tl; 878 879 if (v3) { 880 tl = nfsm_dissect_xx(NFSX_UNSIGNED, md, dpos); 881 if (tl == NULL) 882 return EBADRPC; 883 *s = fxdr_unsigned(int, *tl); 884 if (*s <= 0 || *s > NFSX_V3FHMAX) 885 return EBADRPC; 886 } else 887 *s = NFSX_V2FH; 888 *f = nfsm_dissect_xx(nfsm_rndup(*s), md, dpos); 889 if (*f == NULL) 890 return EBADRPC; 891 else 892 return 0; 893 } 894 895 896 int 897 nfsm_loadattr_xx(struct vnode **v, struct vattr *va, struct mbuf **md, 898 caddr_t *dpos) 899 { 900 int t1; 901 902 struct vnode *ttvp = *v; 903 t1 = nfs_loadattrcache(&ttvp, md, dpos, va, 0); 904 if (t1 != 0) 905 return t1; 906 *v = ttvp; 907 return 0; 908 } 909 910 int 911 nfsm_postop_attr_xx(struct vnode **v, int *f, struct mbuf **md, 912 caddr_t *dpos) 913 { 914 u_int32_t *tl; 915 int t1; 916 917 struct vnode *ttvp = *v; 918 tl = nfsm_dissect_xx(NFSX_UNSIGNED, md, dpos); 919 if (tl == NULL) 920 return EBADRPC; 921 *f = fxdr_unsigned(int, *tl); 922 if (*f != 0) { 923 t1 = nfs_loadattrcache(&ttvp, md, dpos, NULL, 1); 924 if (t1 != 0) { 925 *f = 0; 926 return t1; 927 } 928 *v = ttvp; 929 } 930 return 0; 931 } 932 933 int 934 nfsm_wcc_data_xx(struct vnode **v, int *f, struct mbuf **md, caddr_t *dpos) 935 { 936 u_int32_t *tl; 937 int ttattrf, ttretf = 0; 938 int t1; 939 940 tl = nfsm_dissect_xx(NFSX_UNSIGNED, md, dpos); 941 if (tl == NULL) 942 return EBADRPC; 943 if (*tl == nfs_true) { 944 tl = nfsm_dissect_xx(6 * NFSX_UNSIGNED, md, dpos); 945 if (tl == NULL) 946 return EBADRPC; 947 if (*f) 948 ttretf = (VTONFS(*v)->n_mtime.tv_sec == fxdr_unsigned(u_int32_t, *(tl + 2)) && 949 VTONFS(*v)->n_mtime.tv_nsec == fxdr_unsigned(u_int32_t, *(tl + 3))); 950 } 951 t1 = nfsm_postop_attr_xx(v, &ttattrf, md, dpos); 952 if (t1) 953 return t1; 954 if (*f) 955 *f = ttretf; 956 else 957 *f = ttattrf; 958 return 0; 959 } 960 961 int 962 nfsm_strtom_xx(const char *a, int s, int m, struct mbuf **mb, caddr_t *bpos) 963 { 964 u_int32_t *tl; 965 int t1; 966 967 if (s > m) 968 return ENAMETOOLONG; 969 t1 = nfsm_rndup(s) + NFSX_UNSIGNED; 970 if (t1 <= M_TRAILINGSPACE(*mb)) { 971 tl = nfsm_build_xx(t1, mb, bpos); 972 *tl++ = txdr_unsigned(s); 973 *(tl + ((t1 >> 2) - 2)) = 0; 974 bcopy(a, tl, s); 975 } else { 976 t1 = nfsm_strtmbuf(mb, bpos, a, s); 977 if (t1 != 0) 978 return t1; 979 } 980 return 0; 981 } 982 983 int 984 nfsm_fhtom_xx(struct vnode *v, int v3, struct mbuf **mb, caddr_t *bpos) 985 { 986 u_int32_t *tl; 987 int t1; 988 caddr_t cp; 989 990 if (v3) { 991 t1 = nfsm_rndup(VTONFS(v)->n_fhsize) + NFSX_UNSIGNED; 992 if (t1 < M_TRAILINGSPACE(*mb)) { 993 tl = nfsm_build_xx(t1, mb, bpos); 994 *tl++ = txdr_unsigned(VTONFS(v)->n_fhsize); 995 *(tl + ((t1 >> 2) - 2)) = 0; 996 bcopy(VTONFS(v)->n_fhp, tl, VTONFS(v)->n_fhsize); 997 } else { 998 t1 = nfsm_strtmbuf(mb, bpos, 999 (const char *)VTONFS(v)->n_fhp, 1000 VTONFS(v)->n_fhsize); 1001 if (t1 != 0) 1002 return t1; 1003 } 1004 } else { 1005 cp = nfsm_build_xx(NFSX_V2FH, mb, bpos); 1006 bcopy(VTONFS(v)->n_fhp, cp, NFSX_V2FH); 1007 } 1008 return 0; 1009 } 1010 1011 void 1012 nfsm_v3attrbuild_xx(struct vattr *va, int full, struct mbuf **mb, 1013 caddr_t *bpos) 1014 { 1015 u_int32_t *tl; 1016 1017 if (va->va_mode != (mode_t)VNOVAL) { 1018 tl = nfsm_build_xx(2 * NFSX_UNSIGNED, mb, bpos); 1019 *tl++ = nfs_true; 1020 *tl = txdr_unsigned(va->va_mode); 1021 } else { 1022 tl = nfsm_build_xx(NFSX_UNSIGNED, mb, bpos); 1023 *tl = nfs_false; 1024 } 1025 if (full && va->va_uid != (uid_t)VNOVAL) { 1026 tl = nfsm_build_xx(2 * NFSX_UNSIGNED, mb, bpos); 1027 *tl++ = nfs_true; 1028 *tl = txdr_unsigned(va->va_uid); 1029 } else { 1030 tl = nfsm_build_xx(NFSX_UNSIGNED, mb, bpos); 1031 *tl = nfs_false; 1032 } 1033 if (full && va->va_gid != (gid_t)VNOVAL) { 1034 tl = nfsm_build_xx(2 * NFSX_UNSIGNED, mb, bpos); 1035 *tl++ = nfs_true; 1036 *tl = txdr_unsigned(va->va_gid); 1037 } else { 1038 tl = nfsm_build_xx(NFSX_UNSIGNED, mb, bpos); 1039 *tl = nfs_false; 1040 } 1041 if (full && va->va_size != VNOVAL) { 1042 tl = nfsm_build_xx(3 * NFSX_UNSIGNED, mb, bpos); 1043 *tl++ = nfs_true; 1044 txdr_hyper(va->va_size, tl); 1045 } else { 1046 tl = nfsm_build_xx(NFSX_UNSIGNED, mb, bpos); 1047 *tl = nfs_false; 1048 } 1049 if (va->va_atime.tv_sec != VNOVAL) { 1050 if (va->va_atime.tv_sec != time_second) { 1051 tl = nfsm_build_xx(3 * NFSX_UNSIGNED, mb, bpos); 1052 *tl++ = txdr_unsigned(NFSV3SATTRTIME_TOCLIENT); 1053 txdr_nfsv3time(&va->va_atime, tl); 1054 } else { 1055 tl = nfsm_build_xx(NFSX_UNSIGNED, mb, bpos); 1056 *tl = txdr_unsigned(NFSV3SATTRTIME_TOSERVER); 1057 } 1058 } else { 1059 tl = nfsm_build_xx(NFSX_UNSIGNED, mb, bpos); 1060 *tl = txdr_unsigned(NFSV3SATTRTIME_DONTCHANGE); 1061 } 1062 if (va->va_mtime.tv_sec != VNOVAL) { 1063 if (va->va_mtime.tv_sec != time_second) { 1064 tl = nfsm_build_xx(3 * NFSX_UNSIGNED, mb, bpos); 1065 *tl++ = txdr_unsigned(NFSV3SATTRTIME_TOCLIENT); 1066 txdr_nfsv3time(&va->va_mtime, tl); 1067 } else { 1068 tl = nfsm_build_xx(NFSX_UNSIGNED, mb, bpos); 1069 *tl = txdr_unsigned(NFSV3SATTRTIME_TOSERVER); 1070 } 1071 } else { 1072 tl = nfsm_build_xx(NFSX_UNSIGNED, mb, bpos); 1073 *tl = txdr_unsigned(NFSV3SATTRTIME_DONTCHANGE); 1074 } 1075 }
Cache object: b1981a331a257dbe1763c84e99a94f1c
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