nfs_subs.c revision 99797
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: head/sys/nfsclient/nfs_subs.c 99797 2002-07-11 17:54:58Z dillon $"); 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 <nfs/rpcv2.h> 71#include <nfs/nfsproto.h> 72#include <nfsclient/nfs.h> 73#include <nfsclient/nfsnode.h> 74#include <nfs/xdr_subs.h> 75#include <nfsclient/nfsm_subs.h> 76#include <nfsclient/nfsmount.h> 77 78#include <netinet/in.h> 79 80/* 81 * Data items converted to xdr at startup, since they are constant 82 * This is kinda hokey, but may save a little time doing byte swaps 83 */ 84u_int32_t nfs_xdrneg1; 85u_int32_t rpc_call, rpc_vers, rpc_reply, rpc_msgdenied, rpc_autherr, 86 rpc_mismatch, rpc_auth_unix, rpc_msgaccepted; 87u_int32_t nfs_true, nfs_false; 88 89/* And other global data */ 90static u_int32_t nfs_xid = 0; 91static enum vtype nv2tov_type[8]= { 92 VNON, VREG, VDIR, VBLK, VCHR, VLNK, VNON, VNON 93}; 94 95int nfs_ticks; 96int nfs_pbuf_freecnt = -1; /* start out unlimited */ 97 98struct nfs_reqq nfs_reqq; 99struct nfs_bufq nfs_bufq; 100 101static int nfs_prev_nfsclnt_sy_narg; 102static sy_call_t *nfs_prev_nfsclnt_sy_call; 103 104/* 105 * and the reverse mapping from generic to Version 2 procedure numbers 106 */ 107int nfsv2_procid[NFS_NPROCS] = { 108 NFSV2PROC_NULL, 109 NFSV2PROC_GETATTR, 110 NFSV2PROC_SETATTR, 111 NFSV2PROC_LOOKUP, 112 NFSV2PROC_NOOP, 113 NFSV2PROC_READLINK, 114 NFSV2PROC_READ, 115 NFSV2PROC_WRITE, 116 NFSV2PROC_CREATE, 117 NFSV2PROC_MKDIR, 118 NFSV2PROC_SYMLINK, 119 NFSV2PROC_CREATE, 120 NFSV2PROC_REMOVE, 121 NFSV2PROC_RMDIR, 122 NFSV2PROC_RENAME, 123 NFSV2PROC_LINK, 124 NFSV2PROC_READDIR, 125 NFSV2PROC_NOOP, 126 NFSV2PROC_STATFS, 127 NFSV2PROC_NOOP, 128 NFSV2PROC_NOOP, 129 NFSV2PROC_NOOP, 130 NFSV2PROC_NOOP, 131}; 132 133LIST_HEAD(nfsnodehashhead, nfsnode); 134 135/* 136 * Create the header for an rpc request packet 137 * The hsiz is the size of the rest of the nfs request header. 138 * (just used to decide if a cluster is a good idea) 139 */ 140struct mbuf * 141nfsm_reqhead(struct vnode *vp, u_long procid, int hsiz) 142{ 143 struct mbuf *mb; 144 145 MGET(mb, M_TRYWAIT, MT_DATA); 146 if (hsiz >= MINCLSIZE) 147 MCLGET(mb, M_TRYWAIT); 148 mb->m_len = 0; 149 return (mb); 150} 151 152/* 153 * Build the RPC header and fill in the authorization info. 154 * The authorization string argument is only used when the credentials 155 * come from outside of the kernel. 156 * Returns the head of the mbuf list. 157 */ 158struct mbuf * 159nfsm_rpchead(struct ucred *cr, int nmflag, int procid, int auth_type, 160 int auth_len, struct mbuf *mrest, int mrest_len, struct mbuf **mbp, 161 u_int32_t *xidp) 162{ 163 struct mbuf *mb; 164 u_int32_t *tl; 165 caddr_t bpos; 166 int i; 167 struct mbuf *mreq; 168 int grpsiz, authsiz; 169 170 authsiz = nfsm_rndup(auth_len); 171 MGETHDR(mb, M_TRYWAIT, MT_DATA); 172 if ((authsiz + 10 * NFSX_UNSIGNED) >= MINCLSIZE) { 173 MCLGET(mb, M_TRYWAIT); 174 } else if ((authsiz + 10 * NFSX_UNSIGNED) < MHLEN) { 175 MH_ALIGN(mb, authsiz + 10 * NFSX_UNSIGNED); 176 } else { 177 MH_ALIGN(mb, 8 * NFSX_UNSIGNED); 178 } 179 mb->m_len = 0; 180 mreq = mb; 181 bpos = mtod(mb, caddr_t); 182 183 /* 184 * First the RPC header. 185 */ 186 tl = nfsm_build(u_int32_t *, 8 * NFSX_UNSIGNED); 187 188 /* Get a pretty random xid to start with */ 189 if (!nfs_xid) 190 nfs_xid = random(); 191 /* 192 * Skip zero xid if it should ever happen. 193 */ 194 if (++nfs_xid == 0) 195 nfs_xid++; 196 197 *tl++ = *xidp = txdr_unsigned(nfs_xid); 198 *tl++ = rpc_call; 199 *tl++ = rpc_vers; 200 *tl++ = txdr_unsigned(NFS_PROG); 201 if (nmflag & NFSMNT_NFSV3) { 202 *tl++ = txdr_unsigned(NFS_VER3); 203 *tl++ = txdr_unsigned(procid); 204 } else { 205 *tl++ = txdr_unsigned(NFS_VER2); 206 *tl++ = txdr_unsigned(nfsv2_procid[procid]); 207 } 208 209 /* 210 * And then the authorization cred. 211 */ 212 *tl++ = txdr_unsigned(auth_type); 213 *tl = txdr_unsigned(authsiz); 214 switch (auth_type) { 215 case RPCAUTH_UNIX: 216 tl = nfsm_build(u_int32_t *, auth_len); 217 *tl++ = 0; /* stamp ?? */ 218 *tl++ = 0; /* NULL hostname */ 219 *tl++ = txdr_unsigned(cr->cr_uid); 220 *tl++ = txdr_unsigned(cr->cr_groups[0]); 221 grpsiz = (auth_len >> 2) - 5; 222 *tl++ = txdr_unsigned(grpsiz); 223 for (i = 1; i <= grpsiz; i++) 224 *tl++ = txdr_unsigned(cr->cr_groups[i]); 225 break; 226 } 227 228 /* 229 * And the verifier... 230 */ 231 tl = nfsm_build(u_int32_t *, 2 * NFSX_UNSIGNED); 232 *tl++ = txdr_unsigned(RPCAUTH_NULL); 233 *tl = 0; 234 mb->m_next = mrest; 235 mreq->m_pkthdr.len = authsiz + 10 * NFSX_UNSIGNED + mrest_len; 236 mreq->m_pkthdr.rcvif = NULL; 237 *mbp = mb; 238 return (mreq); 239} 240 241/* 242 * copies a uio scatter/gather list to an mbuf chain. 243 * NOTE: can ony handle iovcnt == 1 244 */ 245int 246nfsm_uiotombuf(struct uio *uiop, struct mbuf **mq, int siz, caddr_t *bpos) 247{ 248 char *uiocp; 249 struct mbuf *mp, *mp2; 250 int xfer, left, mlen; 251 int uiosiz, clflg, rem; 252 char *cp; 253 254#ifdef DIAGNOSTIC 255 if (uiop->uio_iovcnt != 1) 256 panic("nfsm_uiotombuf: iovcnt != 1"); 257#endif 258 259 if (siz > MLEN) /* or should it >= MCLBYTES ?? */ 260 clflg = 1; 261 else 262 clflg = 0; 263 rem = nfsm_rndup(siz)-siz; 264 mp = mp2 = *mq; 265 while (siz > 0) { 266 left = uiop->uio_iov->iov_len; 267 uiocp = uiop->uio_iov->iov_base; 268 if (left > siz) 269 left = siz; 270 uiosiz = left; 271 while (left > 0) { 272 mlen = M_TRAILINGSPACE(mp); 273 if (mlen == 0) { 274 MGET(mp, M_TRYWAIT, MT_DATA); 275 if (clflg) 276 MCLGET(mp, M_TRYWAIT); 277 mp->m_len = 0; 278 mp2->m_next = mp; 279 mp2 = mp; 280 mlen = M_TRAILINGSPACE(mp); 281 } 282 xfer = (left > mlen) ? mlen : left; 283#ifdef notdef 284 /* Not Yet.. */ 285 if (uiop->uio_iov->iov_op != NULL) 286 (*(uiop->uio_iov->iov_op)) 287 (uiocp, mtod(mp, caddr_t)+mp->m_len, xfer); 288 else 289#endif 290 if (uiop->uio_segflg == UIO_SYSSPACE) 291 bcopy(uiocp, mtod(mp, caddr_t)+mp->m_len, xfer); 292 else 293 copyin(uiocp, mtod(mp, caddr_t)+mp->m_len, xfer); 294 mp->m_len += xfer; 295 left -= xfer; 296 uiocp += xfer; 297 uiop->uio_offset += xfer; 298 uiop->uio_resid -= xfer; 299 } 300 uiop->uio_iov->iov_base += uiosiz; 301 uiop->uio_iov->iov_len -= uiosiz; 302 siz -= uiosiz; 303 } 304 if (rem > 0) { 305 if (rem > M_TRAILINGSPACE(mp)) { 306 MGET(mp, M_TRYWAIT, MT_DATA); 307 mp->m_len = 0; 308 mp2->m_next = mp; 309 } 310 cp = mtod(mp, caddr_t)+mp->m_len; 311 for (left = 0; left < rem; left++) 312 *cp++ = '\0'; 313 mp->m_len += rem; 314 *bpos = cp; 315 } else 316 *bpos = mtod(mp, caddr_t)+mp->m_len; 317 *mq = mp; 318 return (0); 319} 320 321/* 322 * Copy a string into mbufs for the hard cases... 323 */ 324int 325nfsm_strtmbuf(struct mbuf **mb, char **bpos, const char *cp, long siz) 326{ 327 struct mbuf *m1 = NULL, *m2; 328 long left, xfer, len, tlen; 329 u_int32_t *tl; 330 int putsize; 331 332 putsize = 1; 333 m2 = *mb; 334 left = M_TRAILINGSPACE(m2); 335 if (left > 0) { 336 tl = ((u_int32_t *)(*bpos)); 337 *tl++ = txdr_unsigned(siz); 338 putsize = 0; 339 left -= NFSX_UNSIGNED; 340 m2->m_len += NFSX_UNSIGNED; 341 if (left > 0) { 342 bcopy(cp, (caddr_t) tl, left); 343 siz -= left; 344 cp += left; 345 m2->m_len += left; 346 left = 0; 347 } 348 } 349 /* Loop around adding mbufs */ 350 while (siz > 0) { 351 MGET(m1, M_TRYWAIT, MT_DATA); 352 if (siz > MLEN) 353 MCLGET(m1, M_TRYWAIT); 354 m1->m_len = NFSMSIZ(m1); 355 m2->m_next = m1; 356 m2 = m1; 357 tl = mtod(m1, u_int32_t *); 358 tlen = 0; 359 if (putsize) { 360 *tl++ = txdr_unsigned(siz); 361 m1->m_len -= NFSX_UNSIGNED; 362 tlen = NFSX_UNSIGNED; 363 putsize = 0; 364 } 365 if (siz < m1->m_len) { 366 len = nfsm_rndup(siz); 367 xfer = siz; 368 if (xfer < len) 369 *(tl+(xfer>>2)) = 0; 370 } else { 371 xfer = len = m1->m_len; 372 } 373 bcopy(cp, (caddr_t) tl, xfer); 374 m1->m_len = len+tlen; 375 siz -= xfer; 376 cp += xfer; 377 } 378 *mb = m1; 379 *bpos = mtod(m1, caddr_t)+m1->m_len; 380 return (0); 381} 382 383/* 384 * Called once to initialize data structures... 385 */ 386int 387nfs_init(struct vfsconf *vfsp) 388{ 389 int i; 390 391 nfsmount_zone = uma_zcreate("NFSMOUNT", sizeof(struct nfsmount), 392 NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0); 393 rpc_vers = txdr_unsigned(RPC_VER2); 394 rpc_call = txdr_unsigned(RPC_CALL); 395 rpc_reply = txdr_unsigned(RPC_REPLY); 396 rpc_msgdenied = txdr_unsigned(RPC_MSGDENIED); 397 rpc_msgaccepted = txdr_unsigned(RPC_MSGACCEPTED); 398 rpc_mismatch = txdr_unsigned(RPC_MISMATCH); 399 rpc_autherr = txdr_unsigned(RPC_AUTHERR); 400 rpc_auth_unix = txdr_unsigned(RPCAUTH_UNIX); 401 nfs_true = txdr_unsigned(TRUE); 402 nfs_false = txdr_unsigned(FALSE); 403 nfs_xdrneg1 = txdr_unsigned(-1); 404 nfs_ticks = (hz * NFS_TICKINTVL + 500) / 1000; 405 if (nfs_ticks < 1) 406 nfs_ticks = 1; 407 /* Ensure async daemons disabled */ 408 for (i = 0; i < NFS_MAXASYNCDAEMON; i++) { 409 nfs_iodwant[i] = NULL; 410 nfs_iodmount[i] = NULL; 411 } 412 nfs_nhinit(); /* Init the nfsnode table */ 413 414 /* 415 * Initialize reply list and start timer 416 */ 417 TAILQ_INIT(&nfs_reqq); 418 419 nfs_timer(0); 420 421 nfs_prev_nfsclnt_sy_narg = sysent[SYS_nfsclnt].sy_narg; 422 sysent[SYS_nfsclnt].sy_narg = 2; 423 nfs_prev_nfsclnt_sy_call = sysent[SYS_nfsclnt].sy_call; 424 sysent[SYS_nfsclnt].sy_call = (sy_call_t *)nfsclnt; 425 426 nfs_pbuf_freecnt = nswbuf / 2 + 1; 427 428 return (0); 429} 430 431int 432nfs_uninit(struct vfsconf *vfsp) 433{ 434 435 untimeout(nfs_timer, (void *)NULL, nfs_timer_handle); 436 sysent[SYS_nfsclnt].sy_narg = nfs_prev_nfsclnt_sy_narg; 437 sysent[SYS_nfsclnt].sy_call = nfs_prev_nfsclnt_sy_call; 438 return (0); 439} 440 441/* 442 * Attribute cache routines. 443 * nfs_loadattrcache() - loads or updates the cache contents from attributes 444 * that are on the mbuf list 445 * nfs_getattrcache() - returns valid attributes if found in cache, returns 446 * error otherwise 447 */ 448 449/* 450 * Load the attribute cache (that lives in the nfsnode entry) with 451 * the values on the mbuf list and 452 * Iff vap not NULL 453 * copy the attributes to *vaper 454 */ 455int 456nfs_loadattrcache(struct vnode **vpp, struct mbuf **mdp, caddr_t *dposp, 457 struct vattr *vaper, int dontshrink) 458{ 459 struct vnode *vp = *vpp; 460 struct vattr *vap; 461 struct nfs_fattr *fp; 462 struct nfsnode *np; 463 int32_t t1; 464 caddr_t cp2; 465 int rdev; 466 struct mbuf *md; 467 enum vtype vtyp; 468 u_short vmode; 469 struct timespec mtime; 470 int v3 = NFS_ISV3(vp); 471 472 md = *mdp; 473 t1 = (mtod(md, caddr_t) + md->m_len) - *dposp; 474 cp2 = nfsm_disct(mdp, dposp, NFSX_FATTR(v3), t1); 475 if (cp2 == NULL) 476 return EBADRPC; 477 fp = (struct nfs_fattr *)cp2; 478 if (v3) { 479 vtyp = nfsv3tov_type(fp->fa_type); 480 vmode = fxdr_unsigned(u_short, fp->fa_mode); 481 rdev = makeudev(fxdr_unsigned(int, fp->fa3_rdev.specdata1), 482 fxdr_unsigned(int, fp->fa3_rdev.specdata2)); 483 fxdr_nfsv3time(&fp->fa3_mtime, &mtime); 484 } else { 485 vtyp = nfsv2tov_type(fp->fa_type); 486 vmode = fxdr_unsigned(u_short, fp->fa_mode); 487 /* 488 * XXX 489 * 490 * The duplicate information returned in fa_type and fa_mode 491 * is an ambiguity in the NFS version 2 protocol. 492 * 493 * VREG should be taken literally as a regular file. If a 494 * server intents to return some type information differently 495 * in the upper bits of the mode field (e.g. for sockets, or 496 * FIFOs), NFSv2 mandates fa_type to be VNON. Anyway, we 497 * leave the examination of the mode bits even in the VREG 498 * case to avoid breakage for bogus servers, but we make sure 499 * that there are actually type bits set in the upper part of 500 * fa_mode (and failing that, trust the va_type field). 501 * 502 * NFSv3 cleared the issue, and requires fa_mode to not 503 * contain any type information (while also introduing sockets 504 * and FIFOs for fa_type). 505 */ 506 if (vtyp == VNON || (vtyp == VREG && (vmode & S_IFMT) != 0)) 507 vtyp = IFTOVT(vmode); 508 rdev = fxdr_unsigned(int32_t, fp->fa2_rdev); 509 fxdr_nfsv2time(&fp->fa2_mtime, &mtime); 510 511 /* 512 * Really ugly NFSv2 kludge. 513 */ 514 if (vtyp == VCHR && rdev == 0xffffffff) 515 vtyp = VFIFO; 516 } 517 518 /* 519 * If v_type == VNON it is a new node, so fill in the v_type, 520 * n_mtime fields. Check to see if it represents a special 521 * device, and if so, check for a possible alias. Once the 522 * correct vnode has been obtained, fill in the rest of the 523 * information. 524 */ 525 np = VTONFS(vp); 526 if (vp->v_type != vtyp) { 527 vp->v_type = vtyp; 528 if (vp->v_type == VFIFO) { 529 vp->v_op = fifo_nfsv2nodeop_p; 530 } 531 if (vp->v_type == VCHR || vp->v_type == VBLK) { 532 vp->v_op = spec_nfsv2nodeop_p; 533 vp = addaliasu(vp, rdev); 534 np->n_vnode = vp; 535 } 536 np->n_mtime = mtime.tv_sec; 537 } 538 vap = &np->n_vattr; 539 vap->va_type = vtyp; 540 vap->va_mode = (vmode & 07777); 541 vap->va_rdev = rdev; 542 vap->va_mtime = mtime; 543 vap->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0]; 544 if (v3) { 545 vap->va_nlink = fxdr_unsigned(u_short, fp->fa_nlink); 546 vap->va_uid = fxdr_unsigned(uid_t, fp->fa_uid); 547 vap->va_gid = fxdr_unsigned(gid_t, fp->fa_gid); 548 vap->va_size = fxdr_hyper(&fp->fa3_size); 549 vap->va_blocksize = NFS_FABLKSIZE; 550 vap->va_bytes = fxdr_hyper(&fp->fa3_used); 551 vap->va_fileid = fxdr_unsigned(int32_t, 552 fp->fa3_fileid.nfsuquad[1]); 553 fxdr_nfsv3time(&fp->fa3_atime, &vap->va_atime); 554 fxdr_nfsv3time(&fp->fa3_ctime, &vap->va_ctime); 555 vap->va_flags = 0; 556 vap->va_filerev = 0; 557 } else { 558 vap->va_nlink = fxdr_unsigned(u_short, fp->fa_nlink); 559 vap->va_uid = fxdr_unsigned(uid_t, fp->fa_uid); 560 vap->va_gid = fxdr_unsigned(gid_t, fp->fa_gid); 561 vap->va_size = fxdr_unsigned(u_int32_t, fp->fa2_size); 562 vap->va_blocksize = fxdr_unsigned(int32_t, fp->fa2_blocksize); 563 vap->va_bytes = (u_quad_t)fxdr_unsigned(int32_t, fp->fa2_blocks) 564 * NFS_FABLKSIZE; 565 vap->va_fileid = fxdr_unsigned(int32_t, fp->fa2_fileid); 566 fxdr_nfsv2time(&fp->fa2_atime, &vap->va_atime); 567 vap->va_flags = 0; 568 vap->va_ctime.tv_sec = fxdr_unsigned(u_int32_t, 569 fp->fa2_ctime.nfsv2_sec); 570 vap->va_ctime.tv_nsec = 0; 571 vap->va_gen = fxdr_unsigned(u_int32_t, fp->fa2_ctime.nfsv2_usec); 572 vap->va_filerev = 0; 573 } 574 np->n_attrstamp = time_second; 575 if (vap->va_size != np->n_size) { 576 if (vap->va_type == VREG) { 577 if (dontshrink && vap->va_size < np->n_size) { 578 /* 579 * We've been told not to shrink the file; 580 * zero np->n_attrstamp to indicate that 581 * the attributes are stale. 582 */ 583 vap->va_size = np->n_size; 584 np->n_attrstamp = 0; 585 } else if (np->n_flag & NMODIFIED) { 586 if (vap->va_size < np->n_size) 587 vap->va_size = np->n_size; 588 else 589 np->n_size = vap->va_size; 590 } else { 591 np->n_size = vap->va_size; 592 } 593 vnode_pager_setsize(vp, np->n_size); 594 } else { 595 np->n_size = vap->va_size; 596 } 597 } 598 if (vaper != NULL) { 599 bcopy((caddr_t)vap, (caddr_t)vaper, sizeof(*vap)); 600 if (np->n_flag & NCHG) { 601 if (np->n_flag & NACC) 602 vaper->va_atime = np->n_atim; 603 if (np->n_flag & NUPD) 604 vaper->va_mtime = np->n_mtim; 605 } 606 } 607 return (0); 608} 609 610#ifdef NFS_ACDEBUG 611#include <sys/sysctl.h> 612SYSCTL_DECL(_vfs_nfs); 613static int nfs_acdebug; 614SYSCTL_INT(_vfs_nfs, OID_AUTO, acdebug, CTLFLAG_RW, &nfs_acdebug, 0, ""); 615#endif 616 617/* 618 * Check the time stamp 619 * If the cache is valid, copy contents to *vap and return 0 620 * otherwise return an error 621 */ 622int 623nfs_getattrcache(struct vnode *vp, struct vattr *vaper) 624{ 625 struct nfsnode *np; 626 struct vattr *vap; 627 struct nfsmount *nmp; 628 int timeo; 629 630 np = VTONFS(vp); 631 vap = &np->n_vattr; 632 nmp = VFSTONFS(vp->v_mount); 633 /* XXX n_mtime doesn't seem to be updated on a miss-and-reload */ 634 timeo = (time_second - np->n_mtime) / 10; 635 636#ifdef NFS_ACDEBUG 637 if (nfs_acdebug>1) 638 printf("nfs_getattrcache: initial timeo = %d\n", timeo); 639#endif 640 641 if (vap->va_type == VDIR) { 642 if ((np->n_flag & NMODIFIED) || timeo < nmp->nm_acdirmin) 643 timeo = nmp->nm_acdirmin; 644 else if (timeo > nmp->nm_acdirmax) 645 timeo = nmp->nm_acdirmax; 646 } else { 647 if ((np->n_flag & NMODIFIED) || timeo < nmp->nm_acregmin) 648 timeo = nmp->nm_acregmin; 649 else if (timeo > nmp->nm_acregmax) 650 timeo = nmp->nm_acregmax; 651 } 652 653#ifdef NFS_ACDEBUG 654 if (nfs_acdebug > 2) 655 printf("acregmin %d; acregmax %d; acdirmin %d; acdirmax %d\n", 656 nmp->nm_acregmin, nmp->nm_acregmax, 657 nmp->nm_acdirmin, nmp->nm_acdirmax); 658 659 if (nfs_acdebug) 660 printf("nfs_getattrcache: age = %d; final timeo = %d\n", 661 (time_second - np->n_attrstamp), timeo); 662#endif 663 664 if ((time_second - np->n_attrstamp) >= timeo) { 665 nfsstats.attrcache_misses++; 666 return (ENOENT); 667 } 668 nfsstats.attrcache_hits++; 669 if (vap->va_size != np->n_size) { 670 if (vap->va_type == VREG) { 671 if (np->n_flag & NMODIFIED) { 672 if (vap->va_size < np->n_size) 673 vap->va_size = np->n_size; 674 else 675 np->n_size = vap->va_size; 676 } else { 677 np->n_size = vap->va_size; 678 } 679 vnode_pager_setsize(vp, np->n_size); 680 } else { 681 np->n_size = vap->va_size; 682 } 683 } 684 bcopy((caddr_t)vap, (caddr_t)vaper, sizeof(struct vattr)); 685 if (np->n_flag & NCHG) { 686 if (np->n_flag & NACC) 687 vaper->va_atime = np->n_atim; 688 if (np->n_flag & NUPD) 689 vaper->va_mtime = np->n_mtim; 690 } 691 return (0); 692} 693 694static nfsuint64 nfs_nullcookie = { { 0, 0 } }; 695/* 696 * This function finds the directory cookie that corresponds to the 697 * logical byte offset given. 698 */ 699nfsuint64 * 700nfs_getcookie(struct nfsnode *np, off_t off, int add) 701{ 702 struct nfsdmap *dp, *dp2; 703 int pos; 704 705 pos = (uoff_t)off / NFS_DIRBLKSIZ; 706 if (pos == 0 || off < 0) { 707#ifdef DIAGNOSTIC 708 if (add) 709 panic("nfs getcookie add at <= 0"); 710#endif 711 return (&nfs_nullcookie); 712 } 713 pos--; 714 dp = LIST_FIRST(&np->n_cookies); 715 if (!dp) { 716 if (add) { 717 MALLOC(dp, struct nfsdmap *, sizeof (struct nfsdmap), 718 M_NFSDIROFF, M_WAITOK); 719 dp->ndm_eocookie = 0; 720 LIST_INSERT_HEAD(&np->n_cookies, dp, ndm_list); 721 } else 722 return (NULL); 723 } 724 while (pos >= NFSNUMCOOKIES) { 725 pos -= NFSNUMCOOKIES; 726 if (LIST_NEXT(dp, ndm_list)) { 727 if (!add && dp->ndm_eocookie < NFSNUMCOOKIES && 728 pos >= dp->ndm_eocookie) 729 return (NULL); 730 dp = LIST_NEXT(dp, ndm_list); 731 } else if (add) { 732 MALLOC(dp2, struct nfsdmap *, sizeof (struct nfsdmap), 733 M_NFSDIROFF, M_WAITOK); 734 dp2->ndm_eocookie = 0; 735 LIST_INSERT_AFTER(dp, dp2, ndm_list); 736 dp = dp2; 737 } else 738 return (NULL); 739 } 740 if (pos >= dp->ndm_eocookie) { 741 if (add) 742 dp->ndm_eocookie = pos + 1; 743 else 744 return (NULL); 745 } 746 return (&dp->ndm_cookies[pos]); 747} 748 749/* 750 * Invalidate cached directory information, except for the actual directory 751 * blocks (which are invalidated separately). 752 * Done mainly to avoid the use of stale offset cookies. 753 */ 754void 755nfs_invaldir(struct vnode *vp) 756{ 757 struct nfsnode *np = VTONFS(vp); 758 759#ifdef DIAGNOSTIC 760 if (vp->v_type != VDIR) 761 panic("nfs: invaldir not dir"); 762#endif 763 np->n_direofoffset = 0; 764 np->n_cookieverf.nfsuquad[0] = 0; 765 np->n_cookieverf.nfsuquad[1] = 0; 766 if (LIST_FIRST(&np->n_cookies)) 767 LIST_FIRST(&np->n_cookies)->ndm_eocookie = 0; 768} 769 770/* 771 * The write verifier has changed (probably due to a server reboot), so all 772 * B_NEEDCOMMIT blocks will have to be written again. Since they are on the 773 * dirty block list as B_DELWRI, all this takes is clearing the B_NEEDCOMMIT 774 * and B_CLUSTEROK flags. Once done the new write verifier can be set for the 775 * mount point. 776 * 777 * B_CLUSTEROK must be cleared along with B_NEEDCOMMIT because stage 1 data 778 * writes are not clusterable. 779 */ 780void 781nfs_clearcommit(struct mount *mp) 782{ 783 struct vnode *vp, *nvp; 784 struct buf *bp, *nbp; 785 int s; 786 787 GIANT_REQUIRED; 788 789 s = splbio(); 790 mtx_lock(&mntvnode_mtx); 791loop: 792 for (vp = TAILQ_FIRST(&mp->mnt_nvnodelist); vp; vp = nvp) { 793 if (vp->v_mount != mp) /* Paranoia */ 794 goto loop; 795 nvp = TAILQ_NEXT(vp, v_nmntvnodes); 796 for (bp = TAILQ_FIRST(&vp->v_dirtyblkhd); bp; bp = nbp) { 797 nbp = TAILQ_NEXT(bp, b_vnbufs); 798 if (BUF_REFCNT(bp) == 0 && 799 (bp->b_flags & (B_DELWRI | B_NEEDCOMMIT)) 800 == (B_DELWRI | B_NEEDCOMMIT)) 801 bp->b_flags &= ~(B_NEEDCOMMIT | B_CLUSTEROK); 802 } 803 } 804 mtx_unlock(&mntvnode_mtx); 805 splx(s); 806} 807 808/* 809 * Helper functions for former macros. Some of these should be 810 * moved to their callers. 811 */ 812 813int 814nfsm_mtofh_xx(struct vnode *d, struct vnode **v, int v3, int *f, 815 struct mbuf **md, caddr_t *dpos) 816{ 817 struct nfsnode *ttnp; 818 struct vnode *ttvp; 819 nfsfh_t *ttfhp; 820 u_int32_t *tl; 821 int ttfhsize; 822 int t1; 823 824 if (v3) { 825 tl = nfsm_dissect_xx(NFSX_UNSIGNED, md, dpos); 826 if (tl == NULL) 827 return EBADRPC; 828 *f = fxdr_unsigned(int, *tl); 829 } else 830 *f = 1; 831 if (*f) { 832 t1 = nfsm_getfh_xx(&ttfhp, &ttfhsize, (v3), md, dpos); 833 if (t1 != 0) 834 return t1; 835 t1 = nfs_nget(d->v_mount, ttfhp, ttfhsize, &ttnp); 836 if (t1 != 0) 837 return t1; 838 *v = NFSTOV(ttnp); 839 } 840 if (v3) { 841 tl = nfsm_dissect_xx(NFSX_UNSIGNED, md, dpos); 842 if (tl == NULL) 843 return EBADRPC; 844 if (*f) 845 *f = fxdr_unsigned(int, *tl); 846 else if (fxdr_unsigned(int, *tl)) 847 nfsm_adv_xx(NFSX_V3FATTR, md, dpos); 848 } 849 if (*f) { 850 ttvp = *v; 851 t1 = nfs_loadattrcache(&ttvp, md, dpos, NULL, 0); 852 if (t1) 853 return t1; 854 *v = ttvp; 855 } 856 return 0; 857} 858 859int 860nfsm_getfh_xx(nfsfh_t **f, int *s, int v3, struct mbuf **md, caddr_t *dpos) 861{ 862 u_int32_t *tl; 863 864 if (v3) { 865 tl = nfsm_dissect_xx(NFSX_UNSIGNED, md, dpos); 866 if (tl == NULL) 867 return EBADRPC; 868 *s = fxdr_unsigned(int, *tl); 869 if (*s <= 0 || *s > NFSX_V3FHMAX) 870 return EBADRPC; 871 } else 872 *s = NFSX_V2FH; 873 *f = nfsm_dissect_xx(nfsm_rndup(*s), md, dpos); 874 if (*f == NULL) 875 return EBADRPC; 876 else 877 return 0; 878} 879 880 881int 882nfsm_loadattr_xx(struct vnode **v, struct vattr *va, struct mbuf **md, 883 caddr_t *dpos) 884{ 885 int t1; 886 887 struct vnode *ttvp = *v; 888 t1 = nfs_loadattrcache(&ttvp, md, dpos, va, 0); 889 if (t1 != 0) 890 return t1; 891 *v = ttvp; 892 return 0; 893} 894 895int 896nfsm_postop_attr_xx(struct vnode **v, int *f, struct mbuf **md, 897 caddr_t *dpos) 898{ 899 u_int32_t *tl; 900 int t1; 901 902 struct vnode *ttvp = *v; 903 tl = nfsm_dissect_xx(NFSX_UNSIGNED, md, dpos); 904 if (tl == NULL) 905 return EBADRPC; 906 *f = fxdr_unsigned(int, *tl); 907 if (*f != 0) { 908 t1 = nfs_loadattrcache(&ttvp, md, dpos, NULL, 1); 909 if (t1 != 0) { 910 *f = 0; 911 return t1; 912 } 913 *v = ttvp; 914 } 915 return 0; 916} 917 918int 919nfsm_wcc_data_xx(struct vnode **v, int *f, struct mbuf **md, caddr_t *dpos) 920{ 921 u_int32_t *tl; 922 int ttattrf, ttretf = 0; 923 int t1; 924 925 tl = nfsm_dissect_xx(NFSX_UNSIGNED, md, dpos); 926 if (tl == NULL) 927 return EBADRPC; 928 if (*tl == nfs_true) { 929 tl = nfsm_dissect_xx(6 * NFSX_UNSIGNED, md, dpos); 930 if (tl == NULL) 931 return EBADRPC; 932 if (*f) 933 ttretf = (VTONFS(*v)->n_mtime == 934 fxdr_unsigned(u_int32_t, *(tl + 2))); 935 } 936 t1 = nfsm_postop_attr_xx(v, &ttattrf, md, dpos); 937 if (t1) 938 return t1; 939 if (*f) 940 *f = ttretf; 941 else 942 *f = ttattrf; 943 return 0; 944} 945 946int 947nfsm_strtom_xx(const char *a, int s, int m, struct mbuf **mb, caddr_t *bpos) 948{ 949 u_int32_t *tl; 950 int t1; 951 952 if (s > m) 953 return ENAMETOOLONG; 954 t1 = nfsm_rndup(s) + NFSX_UNSIGNED; 955 if (t1 <= M_TRAILINGSPACE(*mb)) { 956 tl = nfsm_build_xx(t1, mb, bpos); 957 *tl++ = txdr_unsigned(s); 958 *(tl + ((t1 >> 2) - 2)) = 0; 959 bcopy(a, tl, s); 960 } else { 961 t1 = nfsm_strtmbuf(mb, bpos, a, s); 962 if (t1 != 0) 963 return t1; 964 } 965 return 0; 966} 967 968int 969nfsm_fhtom_xx(struct vnode *v, int v3, struct mbuf **mb, caddr_t *bpos) 970{ 971 u_int32_t *tl; 972 int t1; 973 caddr_t cp; 974 975 if (v3) { 976 t1 = nfsm_rndup(VTONFS(v)->n_fhsize) + NFSX_UNSIGNED; 977 if (t1 < M_TRAILINGSPACE(*mb)) { 978 tl = nfsm_build_xx(t1, mb, bpos); 979 *tl++ = txdr_unsigned(VTONFS(v)->n_fhsize); 980 *(tl + ((t1 >> 2) - 2)) = 0; 981 bcopy(VTONFS(v)->n_fhp, tl, VTONFS(v)->n_fhsize); 982 } else { 983 t1 = nfsm_strtmbuf(mb, bpos, 984 (const char *)VTONFS(v)->n_fhp, 985 VTONFS(v)->n_fhsize); 986 if (t1 != 0) 987 return t1; 988 } 989 } else { 990 cp = nfsm_build_xx(NFSX_V2FH, mb, bpos); 991 bcopy(VTONFS(v)->n_fhp, cp, NFSX_V2FH); 992 } 993 return 0; 994} 995 996void 997nfsm_v3attrbuild_xx(struct vattr *va, int full, struct mbuf **mb, 998 caddr_t *bpos) 999{ 1000 u_int32_t *tl; 1001 1002 if (va->va_mode != (mode_t)VNOVAL) { 1003 tl = nfsm_build_xx(2 * NFSX_UNSIGNED, mb, bpos); 1004 *tl++ = nfs_true; 1005 *tl = txdr_unsigned(va->va_mode); 1006 } else { 1007 tl = nfsm_build_xx(NFSX_UNSIGNED, mb, bpos); 1008 *tl = nfs_false; 1009 } 1010 if (full && va->va_uid != (uid_t)VNOVAL) { 1011 tl = nfsm_build_xx(2 * NFSX_UNSIGNED, mb, bpos); 1012 *tl++ = nfs_true; 1013 *tl = txdr_unsigned(va->va_uid); 1014 } else { 1015 tl = nfsm_build_xx(NFSX_UNSIGNED, mb, bpos); 1016 *tl = nfs_false; 1017 } 1018 if (full && va->va_gid != (gid_t)VNOVAL) { 1019 tl = nfsm_build_xx(2 * NFSX_UNSIGNED, mb, bpos); 1020 *tl++ = nfs_true; 1021 *tl = txdr_unsigned(va->va_gid); 1022 } else { 1023 tl = nfsm_build_xx(NFSX_UNSIGNED, mb, bpos); 1024 *tl = nfs_false; 1025 } 1026 if (full && va->va_size != VNOVAL) { 1027 tl = nfsm_build_xx(3 * NFSX_UNSIGNED, mb, bpos); 1028 *tl++ = nfs_true; 1029 txdr_hyper(va->va_size, tl); 1030 } else { 1031 tl = nfsm_build_xx(NFSX_UNSIGNED, mb, bpos); 1032 *tl = nfs_false; 1033 } 1034 if (va->va_atime.tv_sec != VNOVAL) { 1035 if (va->va_atime.tv_sec != time_second) { 1036 tl = nfsm_build_xx(3 * NFSX_UNSIGNED, mb, bpos); 1037 *tl++ = txdr_unsigned(NFSV3SATTRTIME_TOCLIENT); 1038 txdr_nfsv3time(&va->va_atime, tl); 1039 } else { 1040 tl = nfsm_build_xx(NFSX_UNSIGNED, mb, bpos); 1041 *tl = txdr_unsigned(NFSV3SATTRTIME_TOSERVER); 1042 } 1043 } else { 1044 tl = nfsm_build_xx(NFSX_UNSIGNED, mb, bpos); 1045 *tl = txdr_unsigned(NFSV3SATTRTIME_DONTCHANGE); 1046 } 1047 if (va->va_mtime.tv_sec != VNOVAL) { 1048 if (va->va_mtime.tv_sec != time_second) { 1049 tl = nfsm_build_xx(3 * NFSX_UNSIGNED, mb, bpos); 1050 *tl++ = txdr_unsigned(NFSV3SATTRTIME_TOCLIENT); 1051 txdr_nfsv3time(&va->va_mtime, tl); 1052 } else { 1053 tl = nfsm_build_xx(NFSX_UNSIGNED, mb, bpos); 1054 *tl = txdr_unsigned(NFSV3SATTRTIME_TOSERVER); 1055 } 1056 } else { 1057 tl = nfsm_build_xx(NFSX_UNSIGNED, mb, bpos); 1058 *tl = txdr_unsigned(NFSV3SATTRTIME_DONTCHANGE); 1059 } 1060} 1061