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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 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * @(#)nfs_subs.c 8.8 (Berkeley) 5/22/95 37 */ 38 39 #include <sys/cdefs.h> 40 __FBSDID("$FreeBSD: releng/5.2/sys/nfsclient/nfs_subs.c 122953 2003-11-22 02:21:49Z alfred $"); 41 42 /* 43 * These functions support the macros and help fiddle mbuf chains for 44 * the nfs op functions. They do things like create the rpc header and 45 * copy data between mbuf chains and uio lists. 46 */ 47 48 #include <sys/param.h> 49 #include <sys/systm.h> 50 #include <sys/kernel.h> 51 #include <sys/bio.h> 52 #include <sys/buf.h> 53 #include <sys/proc.h> 54 #include <sys/mount.h> 55 #include <sys/vnode.h> 56 #include <sys/namei.h> 57 #include <sys/mbuf.h> 58 #include <sys/socket.h> 59 #include <sys/stat.h> 60 #include <sys/malloc.h> 61 #include <sys/sysent.h> 62 #include <sys/syscall.h> 63 #include <sys/sysproto.h> 64 65 #include <vm/vm.h> 66 #include <vm/vm_object.h> 67 #include <vm/vm_extern.h> 68 #include <vm/uma.h> 69 70 #include <rpc/rpcclnt.h> 71 72 #include <nfs/rpcv2.h> 73 #include <nfs/nfsproto.h> 74 #include <nfsclient/nfs.h> 75 #include <nfsclient/nfsnode.h> 76 #include <nfs/xdr_subs.h> 77 #include <nfsclient/nfsm_subs.h> 78 #include <nfsclient/nfsmount.h> 79 80 #include <netinet/in.h> 81 82 /* 83 * Data items converted to xdr at startup, since they are constant 84 * This is kinda hokey, but may save a little time doing byte swaps 85 */ 86 u_int32_t nfs_xdrneg1; 87 u_int32_t rpc_call, rpc_vers, rpc_reply, rpc_msgdenied, rpc_autherr, 88 rpc_mismatch, rpc_auth_unix, rpc_msgaccepted; 89 u_int32_t nfs_true, nfs_false; 90 91 /* And other global data */ 92 static u_int32_t nfs_xid = 0; 93 static enum vtype nv2tov_type[8]= { 94 VNON, VREG, VDIR, VBLK, VCHR, VLNK, VNON, VNON 95 }; 96 97 int nfs_ticks; 98 int nfs_pbuf_freecnt = -1; /* start out unlimited */ 99 100 struct nfs_reqq nfs_reqq; 101 struct nfs_bufq nfs_bufq; 102 103 static int nfs_prev_nfsclnt_sy_narg; 104 static sy_call_t *nfs_prev_nfsclnt_sy_call; 105 106 /* 107 * and the reverse mapping from generic to Version 2 procedure numbers 108 */ 109 int nfsv2_procid[NFS_NPROCS] = { 110 NFSV2PROC_NULL, 111 NFSV2PROC_GETATTR, 112 NFSV2PROC_SETATTR, 113 NFSV2PROC_LOOKUP, 114 NFSV2PROC_NOOP, 115 NFSV2PROC_READLINK, 116 NFSV2PROC_READ, 117 NFSV2PROC_WRITE, 118 NFSV2PROC_CREATE, 119 NFSV2PROC_MKDIR, 120 NFSV2PROC_SYMLINK, 121 NFSV2PROC_CREATE, 122 NFSV2PROC_REMOVE, 123 NFSV2PROC_RMDIR, 124 NFSV2PROC_RENAME, 125 NFSV2PROC_LINK, 126 NFSV2PROC_READDIR, 127 NFSV2PROC_NOOP, 128 NFSV2PROC_STATFS, 129 NFSV2PROC_NOOP, 130 NFSV2PROC_NOOP, 131 NFSV2PROC_NOOP, 132 NFSV2PROC_NOOP, 133 }; 134 135 LIST_HEAD(nfsnodehashhead, nfsnode); 136 137 /* 138 * Create the header for an rpc request packet 139 * The hsiz is the size of the rest of the nfs request header. 140 * (just used to decide if a cluster is a good idea) 141 */ 142 struct mbuf * 143 nfsm_reqhead(struct vnode *vp, u_long procid, int hsiz) 144 { 145 struct mbuf *mb; 146 147 MGET(mb, M_TRYWAIT, MT_DATA); 148 if (hsiz >= MINCLSIZE) 149 MCLGET(mb, M_TRYWAIT); 150 mb->m_len = 0; 151 return (mb); 152 } 153 154 /* 155 * Build the RPC header and fill in the authorization info. 156 * The authorization string argument is only used when the credentials 157 * come from outside of the kernel. 158 * Returns the head of the mbuf list. 159 */ 160 struct mbuf * 161 nfsm_rpchead(struct ucred *cr, int nmflag, int procid, int auth_type, 162 int auth_len, struct mbuf *mrest, int mrest_len, struct mbuf **mbp, 163 u_int32_t *xidp) 164 { 165 struct mbuf *mb; 166 u_int32_t *tl; 167 caddr_t bpos; 168 int i; 169 struct mbuf *mreq; 170 int grpsiz, authsiz; 171 172 authsiz = nfsm_rndup(auth_len); 173 MGETHDR(mb, M_TRYWAIT, MT_DATA); 174 if ((authsiz + 10 * NFSX_UNSIGNED) >= MINCLSIZE) { 175 MCLGET(mb, M_TRYWAIT); 176 } else if ((authsiz + 10 * NFSX_UNSIGNED) < MHLEN) { 177 MH_ALIGN(mb, authsiz + 10 * NFSX_UNSIGNED); 178 } else { 179 MH_ALIGN(mb, 8 * NFSX_UNSIGNED); 180 } 181 mb->m_len = 0; 182 mreq = mb; 183 bpos = mtod(mb, caddr_t); 184 185 /* 186 * First the RPC header. 187 */ 188 tl = nfsm_build(u_int32_t *, 8 * NFSX_UNSIGNED); 189 190 /* Get a pretty random xid to start with */ 191 if (!nfs_xid) 192 nfs_xid = random(); 193 /* 194 * Skip zero xid if it should ever happen. 195 */ 196 if (++nfs_xid == 0) 197 nfs_xid++; 198 199 *tl++ = *xidp = txdr_unsigned(nfs_xid); 200 *tl++ = rpc_call; 201 *tl++ = rpc_vers; 202 *tl++ = txdr_unsigned(NFS_PROG); 203 if (nmflag & NFSMNT_NFSV3) { 204 *tl++ = txdr_unsigned(NFS_VER3); 205 *tl++ = txdr_unsigned(procid); 206 } else { 207 *tl++ = txdr_unsigned(NFS_VER2); 208 *tl++ = txdr_unsigned(nfsv2_procid[procid]); 209 } 210 211 /* 212 * And then the authorization cred. 213 */ 214 *tl++ = txdr_unsigned(auth_type); 215 *tl = txdr_unsigned(authsiz); 216 switch (auth_type) { 217 case RPCAUTH_UNIX: 218 tl = nfsm_build(u_int32_t *, auth_len); 219 *tl++ = 0; /* stamp ?? */ 220 *tl++ = 0; /* NULL hostname */ 221 *tl++ = txdr_unsigned(cr->cr_uid); 222 *tl++ = txdr_unsigned(cr->cr_groups[0]); 223 grpsiz = (auth_len >> 2) - 5; 224 *tl++ = txdr_unsigned(grpsiz); 225 for (i = 1; i <= grpsiz; i++) 226 *tl++ = txdr_unsigned(cr->cr_groups[i]); 227 break; 228 } 229 230 /* 231 * And the verifier... 232 */ 233 tl = nfsm_build(u_int32_t *, 2 * NFSX_UNSIGNED); 234 *tl++ = txdr_unsigned(RPCAUTH_NULL); 235 *tl = 0; 236 mb->m_next = mrest; 237 mreq->m_pkthdr.len = authsiz + 10 * NFSX_UNSIGNED + mrest_len; 238 mreq->m_pkthdr.rcvif = NULL; 239 *mbp = mb; 240 return (mreq); 241 } 242 243 /* 244 * copies a uio scatter/gather list to an mbuf chain. 245 * NOTE: can ony handle iovcnt == 1 246 */ 247 int 248 nfsm_uiotombuf(struct uio *uiop, struct mbuf **mq, int siz, caddr_t *bpos) 249 { 250 char *uiocp; 251 struct mbuf *mp, *mp2; 252 int xfer, left, mlen; 253 int uiosiz, clflg, rem; 254 char *cp; 255 256 #ifdef DIAGNOSTIC 257 if (uiop->uio_iovcnt != 1) 258 panic("nfsm_uiotombuf: iovcnt != 1"); 259 #endif 260 261 if (siz > MLEN) /* or should it >= MCLBYTES ?? */ 262 clflg = 1; 263 else 264 clflg = 0; 265 rem = nfsm_rndup(siz)-siz; 266 mp = mp2 = *mq; 267 while (siz > 0) { 268 left = uiop->uio_iov->iov_len; 269 uiocp = uiop->uio_iov->iov_base; 270 if (left > siz) 271 left = siz; 272 uiosiz = left; 273 while (left > 0) { 274 mlen = M_TRAILINGSPACE(mp); 275 if (mlen == 0) { 276 MGET(mp, M_TRYWAIT, MT_DATA); 277 if (clflg) 278 MCLGET(mp, M_TRYWAIT); 279 mp->m_len = 0; 280 mp2->m_next = mp; 281 mp2 = mp; 282 mlen = M_TRAILINGSPACE(mp); 283 } 284 xfer = (left > mlen) ? mlen : left; 285 #ifdef notdef 286 /* Not Yet.. */ 287 if (uiop->uio_iov->iov_op != NULL) 288 (*(uiop->uio_iov->iov_op)) 289 (uiocp, mtod(mp, caddr_t)+mp->m_len, xfer); 290 else 291 #endif 292 if (uiop->uio_segflg == UIO_SYSSPACE) 293 bcopy(uiocp, mtod(mp, caddr_t)+mp->m_len, xfer); 294 else 295 copyin(uiocp, mtod(mp, caddr_t)+mp->m_len, xfer); 296 mp->m_len += xfer; 297 left -= xfer; 298 uiocp += xfer; 299 uiop->uio_offset += xfer; 300 uiop->uio_resid -= xfer; 301 } 302 uiop->uio_iov->iov_base = 303 (char *)uiop->uio_iov->iov_base + uiosiz; 304 uiop->uio_iov->iov_len -= uiosiz; 305 siz -= uiosiz; 306 } 307 if (rem > 0) { 308 if (rem > M_TRAILINGSPACE(mp)) { 309 MGET(mp, M_TRYWAIT, MT_DATA); 310 mp->m_len = 0; 311 mp2->m_next = mp; 312 } 313 cp = mtod(mp, caddr_t)+mp->m_len; 314 for (left = 0; left < rem; left++) 315 *cp++ = '\0'; 316 mp->m_len += rem; 317 *bpos = cp; 318 } else 319 *bpos = mtod(mp, caddr_t)+mp->m_len; 320 *mq = mp; 321 return (0); 322 } 323 324 /* 325 * Copy a string into mbufs for the hard cases... 326 */ 327 int 328 nfsm_strtmbuf(struct mbuf **mb, char **bpos, const char *cp, long siz) 329 { 330 struct mbuf *m1 = NULL, *m2; 331 long left, xfer, len, tlen; 332 u_int32_t *tl; 333 int putsize; 334 335 putsize = 1; 336 m2 = *mb; 337 left = M_TRAILINGSPACE(m2); 338 if (left > 0) { 339 tl = ((u_int32_t *)(*bpos)); 340 *tl++ = txdr_unsigned(siz); 341 putsize = 0; 342 left -= NFSX_UNSIGNED; 343 m2->m_len += NFSX_UNSIGNED; 344 if (left > 0) { 345 bcopy(cp, (caddr_t) tl, left); 346 siz -= left; 347 cp += left; 348 m2->m_len += left; 349 left = 0; 350 } 351 } 352 /* Loop around adding mbufs */ 353 while (siz > 0) { 354 MGET(m1, M_TRYWAIT, MT_DATA); 355 if (siz > MLEN) 356 MCLGET(m1, M_TRYWAIT); 357 m1->m_len = NFSMSIZ(m1); 358 m2->m_next = m1; 359 m2 = m1; 360 tl = mtod(m1, u_int32_t *); 361 tlen = 0; 362 if (putsize) { 363 *tl++ = txdr_unsigned(siz); 364 m1->m_len -= NFSX_UNSIGNED; 365 tlen = NFSX_UNSIGNED; 366 putsize = 0; 367 } 368 if (siz < m1->m_len) { 369 len = nfsm_rndup(siz); 370 xfer = siz; 371 if (xfer < len) 372 *(tl+(xfer>>2)) = 0; 373 } else { 374 xfer = len = m1->m_len; 375 } 376 bcopy(cp, (caddr_t) tl, xfer); 377 m1->m_len = len+tlen; 378 siz -= xfer; 379 cp += xfer; 380 } 381 *mb = m1; 382 *bpos = mtod(m1, caddr_t)+m1->m_len; 383 return (0); 384 } 385 386 /* 387 * Called once to initialize data structures... 388 */ 389 int 390 nfs_init(struct vfsconf *vfsp) 391 { 392 int i; 393 394 nfsmount_zone = uma_zcreate("NFSMOUNT", sizeof(struct nfsmount), 395 NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0); 396 rpc_vers = txdr_unsigned(RPC_VER2); 397 rpc_call = txdr_unsigned(RPC_CALL); 398 rpc_reply = txdr_unsigned(RPC_REPLY); 399 rpc_msgdenied = txdr_unsigned(RPC_MSGDENIED); 400 rpc_msgaccepted = txdr_unsigned(RPC_MSGACCEPTED); 401 rpc_mismatch = txdr_unsigned(RPC_MISMATCH); 402 rpc_autherr = txdr_unsigned(RPC_AUTHERR); 403 rpc_auth_unix = txdr_unsigned(RPCAUTH_UNIX); 404 nfs_true = txdr_unsigned(TRUE); 405 nfs_false = txdr_unsigned(FALSE); 406 nfs_xdrneg1 = txdr_unsigned(-1); 407 nfs_ticks = (hz * NFS_TICKINTVL + 500) / 1000; 408 if (nfs_ticks < 1) 409 nfs_ticks = 1; 410 /* Ensure async daemons disabled */ 411 for (i = 0; i < NFS_MAXASYNCDAEMON; i++) { 412 nfs_iodwant[i] = NULL; 413 nfs_iodmount[i] = NULL; 414 } 415 nfs_nhinit(); /* Init the nfsnode table */ 416 417 /* 418 * Initialize reply list and start timer 419 */ 420 TAILQ_INIT(&nfs_reqq); 421 422 nfs_timer(0); 423 424 nfs_prev_nfsclnt_sy_narg = sysent[SYS_nfsclnt].sy_narg; 425 sysent[SYS_nfsclnt].sy_narg = 2; 426 nfs_prev_nfsclnt_sy_call = sysent[SYS_nfsclnt].sy_call; 427 sysent[SYS_nfsclnt].sy_call = (sy_call_t *)nfsclnt; 428 429 nfs_pbuf_freecnt = nswbuf / 2 + 1; 430 431 return (0); 432 } 433 434 int 435 nfs_uninit(struct vfsconf *vfsp) 436 { 437 438 untimeout(nfs_timer, (void *)NULL, nfs_timer_handle); 439 sysent[SYS_nfsclnt].sy_narg = nfs_prev_nfsclnt_sy_narg; 440 sysent[SYS_nfsclnt].sy_call = nfs_prev_nfsclnt_sy_call; 441 return (0); 442 } 443 444 /* 445 * Attribute cache routines. 446 * nfs_loadattrcache() - loads or updates the cache contents from attributes 447 * that are on the mbuf list 448 * nfs_getattrcache() - returns valid attributes if found in cache, returns 449 * error otherwise 450 */ 451 452 /* 453 * Load the attribute cache (that lives in the nfsnode entry) with 454 * the values on the mbuf list and 455 * Iff vap not NULL 456 * copy the attributes to *vaper 457 */ 458 int 459 nfs_loadattrcache(struct vnode **vpp, struct mbuf **mdp, caddr_t *dposp, 460 struct vattr *vaper, int dontshrink) 461 { 462 struct vnode *vp = *vpp; 463 struct vattr *vap; 464 struct nfs_fattr *fp; 465 struct nfsnode *np; 466 int32_t t1; 467 caddr_t cp2; 468 int rdev; 469 struct mbuf *md; 470 enum vtype vtyp; 471 u_short vmode; 472 struct timespec mtime; 473 int v3 = NFS_ISV3(vp); 474 475 md = *mdp; 476 t1 = (mtod(md, caddr_t) + md->m_len) - *dposp; 477 cp2 = nfsm_disct(mdp, dposp, NFSX_FATTR(v3), t1); 478 if (cp2 == NULL) 479 return EBADRPC; 480 fp = (struct nfs_fattr *)cp2; 481 if (v3) { 482 vtyp = nfsv3tov_type(fp->fa_type); 483 vmode = fxdr_unsigned(u_short, fp->fa_mode); 484 rdev = makeudev(fxdr_unsigned(int, fp->fa3_rdev.specdata1), 485 fxdr_unsigned(int, fp->fa3_rdev.specdata2)); 486 fxdr_nfsv3time(&fp->fa3_mtime, &mtime); 487 } else { 488 vtyp = nfsv2tov_type(fp->fa_type); 489 vmode = fxdr_unsigned(u_short, fp->fa_mode); 490 /* 491 * XXX 492 * 493 * The duplicate information returned in fa_type and fa_mode 494 * is an ambiguity in the NFS version 2 protocol. 495 * 496 * VREG should be taken literally as a regular file. If a 497 * server intents to return some type information differently 498 * in the upper bits of the mode field (e.g. for sockets, or 499 * FIFOs), NFSv2 mandates fa_type to be VNON. Anyway, we 500 * leave the examination of the mode bits even in the VREG 501 * case to avoid breakage for bogus servers, but we make sure 502 * that there are actually type bits set in the upper part of 503 * fa_mode (and failing that, trust the va_type field). 504 * 505 * NFSv3 cleared the issue, and requires fa_mode to not 506 * contain any type information (while also introduing sockets 507 * and FIFOs for fa_type). 508 */ 509 if (vtyp == VNON || (vtyp == VREG && (vmode & S_IFMT) != 0)) 510 vtyp = IFTOVT(vmode); 511 rdev = fxdr_unsigned(int32_t, fp->fa2_rdev); 512 fxdr_nfsv2time(&fp->fa2_mtime, &mtime); 513 514 /* 515 * Really ugly NFSv2 kludge. 516 */ 517 if (vtyp == VCHR && rdev == 0xffffffff) 518 vtyp = VFIFO; 519 } 520 521 /* 522 * If v_type == VNON it is a new node, so fill in the v_type, 523 * n_mtime fields. Check to see if it represents a special 524 * device, and if so, check for a possible alias. Once the 525 * correct vnode has been obtained, fill in the rest of the 526 * information. 527 */ 528 np = VTONFS(vp); 529 if (vp->v_type != vtyp) { 530 vp->v_type = vtyp; 531 if (vp->v_type == VFIFO) { 532 vp->v_op = fifo_nfsnodeop_p; 533 } 534 if (vp->v_type == VCHR || vp->v_type == VBLK) { 535 vp->v_op = spec_nfsnodeop_p; 536 vp = addaliasu(vp, rdev); 537 np->n_vnode = vp; 538 } 539 np->n_mtime = mtime.tv_sec; 540 } 541 vap = &np->n_vattr; 542 vap->va_type = vtyp; 543 vap->va_mode = (vmode & 07777); 544 vap->va_rdev = rdev; 545 vap->va_mtime = mtime; 546 vap->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0]; 547 if (v3) { 548 vap->va_nlink = fxdr_unsigned(u_short, fp->fa_nlink); 549 vap->va_uid = fxdr_unsigned(uid_t, fp->fa_uid); 550 vap->va_gid = fxdr_unsigned(gid_t, fp->fa_gid); 551 vap->va_size = fxdr_hyper(&fp->fa3_size); 552 vap->va_blocksize = NFS_FABLKSIZE; 553 vap->va_bytes = fxdr_hyper(&fp->fa3_used); 554 vap->va_fileid = fxdr_unsigned(int32_t, 555 fp->fa3_fileid.nfsuquad[1]); 556 fxdr_nfsv3time(&fp->fa3_atime, &vap->va_atime); 557 fxdr_nfsv3time(&fp->fa3_ctime, &vap->va_ctime); 558 vap->va_flags = 0; 559 vap->va_filerev = 0; 560 } else { 561 vap->va_nlink = fxdr_unsigned(u_short, fp->fa_nlink); 562 vap->va_uid = fxdr_unsigned(uid_t, fp->fa_uid); 563 vap->va_gid = fxdr_unsigned(gid_t, fp->fa_gid); 564 vap->va_size = fxdr_unsigned(u_int32_t, fp->fa2_size); 565 vap->va_blocksize = fxdr_unsigned(int32_t, fp->fa2_blocksize); 566 vap->va_bytes = (u_quad_t)fxdr_unsigned(int32_t, fp->fa2_blocks) 567 * NFS_FABLKSIZE; 568 vap->va_fileid = fxdr_unsigned(int32_t, fp->fa2_fileid); 569 fxdr_nfsv2time(&fp->fa2_atime, &vap->va_atime); 570 vap->va_flags = 0; 571 vap->va_ctime.tv_sec = fxdr_unsigned(u_int32_t, 572 fp->fa2_ctime.nfsv2_sec); 573 vap->va_ctime.tv_nsec = 0; 574 vap->va_gen = fxdr_unsigned(u_int32_t, fp->fa2_ctime.nfsv2_usec); 575 vap->va_filerev = 0; 576 } 577 np->n_attrstamp = time_second; 578 if (vap->va_size != np->n_size) { 579 if (vap->va_type == VREG) { 580 if (dontshrink && vap->va_size < np->n_size) { 581 /* 582 * We've been told not to shrink the file; 583 * zero np->n_attrstamp to indicate that 584 * the attributes are stale. 585 */ 586 vap->va_size = np->n_size; 587 np->n_attrstamp = 0; 588 } else if (np->n_flag & NMODIFIED) { 589 if (vap->va_size < np->n_size) 590 vap->va_size = np->n_size; 591 else 592 np->n_size = vap->va_size; 593 } else { 594 np->n_size = vap->va_size; 595 } 596 vnode_pager_setsize(vp, np->n_size); 597 } else { 598 np->n_size = vap->va_size; 599 } 600 } 601 if (vaper != NULL) { 602 bcopy((caddr_t)vap, (caddr_t)vaper, sizeof(*vap)); 603 if (np->n_flag & NCHG) { 604 if (np->n_flag & NACC) 605 vaper->va_atime = np->n_atim; 606 if (np->n_flag & NUPD) 607 vaper->va_mtime = np->n_mtim; 608 } 609 } 610 return (0); 611 } 612 613 #ifdef NFS_ACDEBUG 614 #include <sys/sysctl.h> 615 SYSCTL_DECL(_vfs_nfs); 616 static int nfs_acdebug; 617 SYSCTL_INT(_vfs_nfs, OID_AUTO, acdebug, CTLFLAG_RW, &nfs_acdebug, 0, ""); 618 #endif 619 620 /* 621 * Check the time stamp 622 * If the cache is valid, copy contents to *vap and return 0 623 * otherwise return an error 624 */ 625 int 626 nfs_getattrcache(struct vnode *vp, struct vattr *vaper) 627 { 628 struct nfsnode *np; 629 struct vattr *vap; 630 struct nfsmount *nmp; 631 int timeo; 632 633 np = VTONFS(vp); 634 vap = &np->n_vattr; 635 nmp = VFSTONFS(vp->v_mount); 636 /* XXX n_mtime doesn't seem to be updated on a miss-and-reload */ 637 timeo = (time_second - np->n_mtime) / 10; 638 639 #ifdef NFS_ACDEBUG 640 if (nfs_acdebug>1) 641 printf("nfs_getattrcache: initial timeo = %d\n", timeo); 642 #endif 643 644 if (vap->va_type == VDIR) { 645 if ((np->n_flag & NMODIFIED) || timeo < nmp->nm_acdirmin) 646 timeo = nmp->nm_acdirmin; 647 else if (timeo > nmp->nm_acdirmax) 648 timeo = nmp->nm_acdirmax; 649 } else { 650 if ((np->n_flag & NMODIFIED) || timeo < nmp->nm_acregmin) 651 timeo = nmp->nm_acregmin; 652 else if (timeo > nmp->nm_acregmax) 653 timeo = nmp->nm_acregmax; 654 } 655 656 #ifdef NFS_ACDEBUG 657 if (nfs_acdebug > 2) 658 printf("acregmin %d; acregmax %d; acdirmin %d; acdirmax %d\n", 659 nmp->nm_acregmin, nmp->nm_acregmax, 660 nmp->nm_acdirmin, nmp->nm_acdirmax); 661 662 if (nfs_acdebug) 663 printf("nfs_getattrcache: age = %d; final timeo = %d\n", 664 (time_second - np->n_attrstamp), timeo); 665 #endif 666 667 if ((time_second - np->n_attrstamp) >= timeo) { 668 nfsstats.attrcache_misses++; 669 return (ENOENT); 670 } 671 nfsstats.attrcache_hits++; 672 if (vap->va_size != np->n_size) { 673 if (vap->va_type == VREG) { 674 if (np->n_flag & NMODIFIED) { 675 if (vap->va_size < np->n_size) 676 vap->va_size = np->n_size; 677 else 678 np->n_size = vap->va_size; 679 } else { 680 np->n_size = vap->va_size; 681 } 682 vnode_pager_setsize(vp, np->n_size); 683 } else { 684 np->n_size = vap->va_size; 685 } 686 } 687 bcopy((caddr_t)vap, (caddr_t)vaper, sizeof(struct vattr)); 688 if (np->n_flag & NCHG) { 689 if (np->n_flag & NACC) 690 vaper->va_atime = np->n_atim; 691 if (np->n_flag & NUPD) 692 vaper->va_mtime = np->n_mtim; 693 } 694 return (0); 695 } 696 697 static nfsuint64 nfs_nullcookie = { { 0, 0 } }; 698 /* 699 * This function finds the directory cookie that corresponds to the 700 * logical byte offset given. 701 */ 702 nfsuint64 * 703 nfs_getcookie(struct nfsnode *np, off_t off, int add) 704 { 705 struct nfsdmap *dp, *dp2; 706 int pos; 707 708 pos = (uoff_t)off / NFS_DIRBLKSIZ; 709 if (pos == 0 || off < 0) { 710 #ifdef DIAGNOSTIC 711 if (add) 712 panic("nfs getcookie add at <= 0"); 713 #endif 714 return (&nfs_nullcookie); 715 } 716 pos--; 717 dp = LIST_FIRST(&np->n_cookies); 718 if (!dp) { 719 if (add) { 720 MALLOC(dp, struct nfsdmap *, sizeof (struct nfsdmap), 721 M_NFSDIROFF, M_WAITOK); 722 dp->ndm_eocookie = 0; 723 LIST_INSERT_HEAD(&np->n_cookies, dp, ndm_list); 724 } else 725 return (NULL); 726 } 727 while (pos >= NFSNUMCOOKIES) { 728 pos -= NFSNUMCOOKIES; 729 if (LIST_NEXT(dp, ndm_list)) { 730 if (!add && dp->ndm_eocookie < NFSNUMCOOKIES && 731 pos >= dp->ndm_eocookie) 732 return (NULL); 733 dp = LIST_NEXT(dp, ndm_list); 734 } else if (add) { 735 MALLOC(dp2, struct nfsdmap *, sizeof (struct nfsdmap), 736 M_NFSDIROFF, M_WAITOK); 737 dp2->ndm_eocookie = 0; 738 LIST_INSERT_AFTER(dp, dp2, ndm_list); 739 dp = dp2; 740 } else 741 return (NULL); 742 } 743 if (pos >= dp->ndm_eocookie) { 744 if (add) 745 dp->ndm_eocookie = pos + 1; 746 else 747 return (NULL); 748 } 749 return (&dp->ndm_cookies[pos]); 750 } 751 752 /* 753 * Invalidate cached directory information, except for the actual directory 754 * blocks (which are invalidated separately). 755 * Done mainly to avoid the use of stale offset cookies. 756 */ 757 void 758 nfs_invaldir(struct vnode *vp) 759 { 760 struct nfsnode *np = VTONFS(vp); 761 762 #ifdef DIAGNOSTIC 763 if (vp->v_type != VDIR) 764 panic("nfs: invaldir not dir"); 765 #endif 766 np->n_direofoffset = 0; 767 np->n_cookieverf.nfsuquad[0] = 0; 768 np->n_cookieverf.nfsuquad[1] = 0; 769 if (LIST_FIRST(&np->n_cookies)) 770 LIST_FIRST(&np->n_cookies)->ndm_eocookie = 0; 771 } 772 773 /* 774 * The write verifier has changed (probably due to a server reboot), so all 775 * B_NEEDCOMMIT blocks will have to be written again. Since they are on the 776 * dirty block list as B_DELWRI, all this takes is clearing the B_NEEDCOMMIT 777 * and B_CLUSTEROK flags. Once done the new write verifier can be set for the 778 * mount point. 779 * 780 * B_CLUSTEROK must be cleared along with B_NEEDCOMMIT because stage 1 data 781 * writes are not clusterable. 782 */ 783 void 784 nfs_clearcommit(struct mount *mp) 785 { 786 struct vnode *vp, *nvp; 787 struct buf *bp, *nbp; 788 int s; 789 790 GIANT_REQUIRED; 791 792 s = splbio(); 793 MNT_ILOCK(mp); 794 loop: 795 for (vp = TAILQ_FIRST(&mp->mnt_nvnodelist); vp; vp = nvp) { 796 if (vp->v_mount != mp) /* Paranoia */ 797 goto loop; 798 nvp = TAILQ_NEXT(vp, v_nmntvnodes); 799 VI_LOCK(vp); 800 if (vp->v_iflag & VI_XLOCK) { 801 VI_UNLOCK(vp); 802 continue; 803 } 804 MNT_IUNLOCK(mp); 805 for (bp = TAILQ_FIRST(&vp->v_dirtyblkhd); bp; bp = nbp) { 806 nbp = TAILQ_NEXT(bp, b_vnbufs); 807 if (BUF_REFCNT(bp) == 0 && 808 (bp->b_flags & (B_DELWRI | B_NEEDCOMMIT)) 809 == (B_DELWRI | B_NEEDCOMMIT)) 810 bp->b_flags &= ~(B_NEEDCOMMIT | B_CLUSTEROK); 811 } 812 VI_UNLOCK(vp); 813 MNT_ILOCK(mp); 814 } 815 MNT_IUNLOCK(mp); 816 splx(s); 817 } 818 819 /* 820 * Helper functions for former macros. Some of these should be 821 * moved to their callers. 822 */ 823 824 int 825 nfsm_mtofh_xx(struct vnode *d, struct vnode **v, int v3, int *f, 826 struct mbuf **md, caddr_t *dpos) 827 { 828 struct nfsnode *ttnp; 829 struct vnode *ttvp; 830 nfsfh_t *ttfhp; 831 u_int32_t *tl; 832 int ttfhsize; 833 int t1; 834 835 if (v3) { 836 tl = nfsm_dissect_xx(NFSX_UNSIGNED, md, dpos); 837 if (tl == NULL) 838 return EBADRPC; 839 *f = fxdr_unsigned(int, *tl); 840 } else 841 *f = 1; 842 if (*f) { 843 t1 = nfsm_getfh_xx(&ttfhp, &ttfhsize, (v3), md, dpos); 844 if (t1 != 0) 845 return t1; 846 t1 = nfs_nget(d->v_mount, ttfhp, ttfhsize, &ttnp); 847 if (t1 != 0) 848 return t1; 849 *v = NFSTOV(ttnp); 850 } 851 if (v3) { 852 tl = nfsm_dissect_xx(NFSX_UNSIGNED, md, dpos); 853 if (tl == NULL) 854 return EBADRPC; 855 if (*f) 856 *f = fxdr_unsigned(int, *tl); 857 else if (fxdr_unsigned(int, *tl)) 858 nfsm_adv_xx(NFSX_V3FATTR, md, dpos); 859 } 860 if (*f) { 861 ttvp = *v; 862 t1 = nfs_loadattrcache(&ttvp, md, dpos, NULL, 0); 863 if (t1) 864 return t1; 865 *v = ttvp; 866 } 867 return 0; 868 } 869 870 int 871 nfsm_getfh_xx(nfsfh_t **f, int *s, int v3, struct mbuf **md, caddr_t *dpos) 872 { 873 u_int32_t *tl; 874 875 if (v3) { 876 tl = nfsm_dissect_xx(NFSX_UNSIGNED, md, dpos); 877 if (tl == NULL) 878 return EBADRPC; 879 *s = fxdr_unsigned(int, *tl); 880 if (*s <= 0 || *s > NFSX_V3FHMAX) 881 return EBADRPC; 882 } else 883 *s = NFSX_V2FH; 884 *f = nfsm_dissect_xx(nfsm_rndup(*s), md, dpos); 885 if (*f == NULL) 886 return EBADRPC; 887 else 888 return 0; 889 } 890 891 892 int 893 nfsm_loadattr_xx(struct vnode **v, struct vattr *va, struct mbuf **md, 894 caddr_t *dpos) 895 { 896 int t1; 897 898 struct vnode *ttvp = *v; 899 t1 = nfs_loadattrcache(&ttvp, md, dpos, va, 0); 900 if (t1 != 0) 901 return t1; 902 *v = ttvp; 903 return 0; 904 } 905 906 int 907 nfsm_postop_attr_xx(struct vnode **v, int *f, struct mbuf **md, 908 caddr_t *dpos) 909 { 910 u_int32_t *tl; 911 int t1; 912 913 struct vnode *ttvp = *v; 914 tl = nfsm_dissect_xx(NFSX_UNSIGNED, md, dpos); 915 if (tl == NULL) 916 return EBADRPC; 917 *f = fxdr_unsigned(int, *tl); 918 if (*f != 0) { 919 t1 = nfs_loadattrcache(&ttvp, md, dpos, NULL, 1); 920 if (t1 != 0) { 921 *f = 0; 922 return t1; 923 } 924 *v = ttvp; 925 } 926 return 0; 927 } 928 929 int 930 nfsm_wcc_data_xx(struct vnode **v, int *f, struct mbuf **md, caddr_t *dpos) 931 { 932 u_int32_t *tl; 933 int ttattrf, ttretf = 0; 934 int t1; 935 936 tl = nfsm_dissect_xx(NFSX_UNSIGNED, md, dpos); 937 if (tl == NULL) 938 return EBADRPC; 939 if (*tl == nfs_true) { 940 tl = nfsm_dissect_xx(6 * NFSX_UNSIGNED, md, dpos); 941 if (tl == NULL) 942 return EBADRPC; 943 if (*f) 944 ttretf = (VTONFS(*v)->n_mtime == 945 fxdr_unsigned(u_int32_t, *(tl + 2))); 946 } 947 t1 = nfsm_postop_attr_xx(v, &ttattrf, md, dpos); 948 if (t1) 949 return t1; 950 if (*f) 951 *f = ttretf; 952 else 953 *f = ttattrf; 954 return 0; 955 } 956 957 int 958 nfsm_strtom_xx(const char *a, int s, int m, struct mbuf **mb, caddr_t *bpos) 959 { 960 u_int32_t *tl; 961 int t1; 962 963 if (s > m) 964 return ENAMETOOLONG; 965 t1 = nfsm_rndup(s) + NFSX_UNSIGNED; 966 if (t1 <= M_TRAILINGSPACE(*mb)) { 967 tl = nfsm_build_xx(t1, mb, bpos); 968 *tl++ = txdr_unsigned(s); 969 *(tl + ((t1 >> 2) - 2)) = 0; 970 bcopy(a, tl, s); 971 } else { 972 t1 = nfsm_strtmbuf(mb, bpos, a, s); 973 if (t1 != 0) 974 return t1; 975 } 976 return 0; 977 } 978 979 int 980 nfsm_fhtom_xx(struct vnode *v, int v3, struct mbuf **mb, caddr_t *bpos) 981 { 982 u_int32_t *tl; 983 int t1; 984 caddr_t cp; 985 986 if (v3) { 987 t1 = nfsm_rndup(VTONFS(v)->n_fhsize) + NFSX_UNSIGNED; 988 if (t1 < M_TRAILINGSPACE(*mb)) { 989 tl = nfsm_build_xx(t1, mb, bpos); 990 *tl++ = txdr_unsigned(VTONFS(v)->n_fhsize); 991 *(tl + ((t1 >> 2) - 2)) = 0; 992 bcopy(VTONFS(v)->n_fhp, tl, VTONFS(v)->n_fhsize); 993 } else { 994 t1 = nfsm_strtmbuf(mb, bpos, 995 (const char *)VTONFS(v)->n_fhp, 996 VTONFS(v)->n_fhsize); 997 if (t1 != 0) 998 return t1; 999 } 1000 } else { 1001 cp = nfsm_build_xx(NFSX_V2FH, mb, bpos); 1002 bcopy(VTONFS(v)->n_fhp, cp, NFSX_V2FH); 1003 } 1004 return 0; 1005 } 1006 1007 void 1008 nfsm_v3attrbuild_xx(struct vattr *va, int full, struct mbuf **mb, 1009 caddr_t *bpos) 1010 { 1011 u_int32_t *tl; 1012 1013 if (va->va_mode != (mode_t)VNOVAL) { 1014 tl = nfsm_build_xx(2 * NFSX_UNSIGNED, mb, bpos); 1015 *tl++ = nfs_true; 1016 *tl = txdr_unsigned(va->va_mode); 1017 } else { 1018 tl = nfsm_build_xx(NFSX_UNSIGNED, mb, bpos); 1019 *tl = nfs_false; 1020 } 1021 if (full && va->va_uid != (uid_t)VNOVAL) { 1022 tl = nfsm_build_xx(2 * NFSX_UNSIGNED, mb, bpos); 1023 *tl++ = nfs_true; 1024 *tl = txdr_unsigned(va->va_uid); 1025 } else { 1026 tl = nfsm_build_xx(NFSX_UNSIGNED, mb, bpos); 1027 *tl = nfs_false; 1028 } 1029 if (full && va->va_gid != (gid_t)VNOVAL) { 1030 tl = nfsm_build_xx(2 * NFSX_UNSIGNED, mb, bpos); 1031 *tl++ = nfs_true; 1032 *tl = txdr_unsigned(va->va_gid); 1033 } else { 1034 tl = nfsm_build_xx(NFSX_UNSIGNED, mb, bpos); 1035 *tl = nfs_false; 1036 } 1037 if (full && va->va_size != VNOVAL) { 1038 tl = nfsm_build_xx(3 * NFSX_UNSIGNED, mb, bpos); 1039 *tl++ = nfs_true; 1040 txdr_hyper(va->va_size, tl); 1041 } else { 1042 tl = nfsm_build_xx(NFSX_UNSIGNED, mb, bpos); 1043 *tl = nfs_false; 1044 } 1045 if (va->va_atime.tv_sec != VNOVAL) { 1046 if (va->va_atime.tv_sec != time_second) { 1047 tl = nfsm_build_xx(3 * NFSX_UNSIGNED, mb, bpos); 1048 *tl++ = txdr_unsigned(NFSV3SATTRTIME_TOCLIENT); 1049 txdr_nfsv3time(&va->va_atime, tl); 1050 } else { 1051 tl = nfsm_build_xx(NFSX_UNSIGNED, mb, bpos); 1052 *tl = txdr_unsigned(NFSV3SATTRTIME_TOSERVER); 1053 } 1054 } else { 1055 tl = nfsm_build_xx(NFSX_UNSIGNED, mb, bpos); 1056 *tl = txdr_unsigned(NFSV3SATTRTIME_DONTCHANGE); 1057 } 1058 if (va->va_mtime.tv_sec != VNOVAL) { 1059 if (va->va_mtime.tv_sec != time_second) { 1060 tl = nfsm_build_xx(3 * NFSX_UNSIGNED, mb, bpos); 1061 *tl++ = txdr_unsigned(NFSV3SATTRTIME_TOCLIENT); 1062 txdr_nfsv3time(&va->va_mtime, tl); 1063 } else { 1064 tl = nfsm_build_xx(NFSX_UNSIGNED, mb, bpos); 1065 *tl = txdr_unsigned(NFSV3SATTRTIME_TOSERVER); 1066 } 1067 } else { 1068 tl = nfsm_build_xx(NFSX_UNSIGNED, mb, bpos); 1069 *tl = txdr_unsigned(NFSV3SATTRTIME_DONTCHANGE); 1070 } 1071 }
Cache object: ec17e54ee2c3f5da25b8fa5ac2808cc7
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