Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
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("$FreeBSD$"); 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 u_int32_t 133 nfs_xid_gen(void) 134 { 135 136 /* Get a pretty random xid to start with */ 137 if (!nfs_xid) 138 nfs_xid = random(); 139 /* 140 * Skip zero xid if it should ever happen. 141 */ 142 if (++nfs_xid == 0) 143 nfs_xid++; 144 return (nfs_xid); 145 } 146 147 /* 148 * Create the header for an rpc request packet 149 * The hsiz is the size of the rest of the nfs request header. 150 * (just used to decide if a cluster is a good idea) 151 */ 152 struct mbuf * 153 nfsm_reqhead(struct vnode *vp, u_long procid, int hsiz) 154 { 155 struct mbuf *mb; 156 157 MGET(mb, M_TRYWAIT, MT_DATA); 158 if (hsiz >= MINCLSIZE) 159 MCLGET(mb, M_TRYWAIT); 160 mb->m_len = 0; 161 return (mb); 162 } 163 164 /* 165 * Build the RPC header and fill in the authorization info. 166 * The authorization string argument is only used when the credentials 167 * come from outside of the kernel. 168 * Returns the head of the mbuf list. 169 */ 170 struct mbuf * 171 nfsm_rpchead(struct ucred *cr, int nmflag, int procid, int auth_type, 172 int auth_len, struct mbuf *mrest, int mrest_len, struct mbuf **mbp, 173 u_int32_t **xidpp) 174 { 175 struct mbuf *mb; 176 u_int32_t *tl; 177 caddr_t bpos; 178 int i; 179 struct mbuf *mreq; 180 int grpsiz, authsiz; 181 182 authsiz = nfsm_rndup(auth_len); 183 MGETHDR(mb, M_TRYWAIT, MT_DATA); 184 if ((authsiz + 10 * NFSX_UNSIGNED) >= MINCLSIZE) { 185 MCLGET(mb, M_TRYWAIT); 186 } else if ((authsiz + 10 * NFSX_UNSIGNED) < MHLEN) { 187 MH_ALIGN(mb, authsiz + 10 * NFSX_UNSIGNED); 188 } else { 189 MH_ALIGN(mb, 8 * NFSX_UNSIGNED); 190 } 191 mb->m_len = 0; 192 mreq = mb; 193 bpos = mtod(mb, caddr_t); 194 195 /* 196 * First the RPC header. 197 */ 198 tl = nfsm_build(u_int32_t *, 8 * NFSX_UNSIGNED); 199 200 *xidpp = tl; 201 *tl++ = txdr_unsigned(nfs_xid_gen()); 202 *tl++ = rpc_call; 203 *tl++ = rpc_vers; 204 *tl++ = txdr_unsigned(NFS_PROG); 205 if (nmflag & NFSMNT_NFSV3) { 206 *tl++ = txdr_unsigned(NFS_VER3); 207 *tl++ = txdr_unsigned(procid); 208 } else { 209 *tl++ = txdr_unsigned(NFS_VER2); 210 *tl++ = txdr_unsigned(nfsv2_procid[procid]); 211 } 212 213 /* 214 * And then the authorization cred. 215 */ 216 *tl++ = txdr_unsigned(auth_type); 217 *tl = txdr_unsigned(authsiz); 218 switch (auth_type) { 219 case RPCAUTH_UNIX: 220 tl = nfsm_build(u_int32_t *, auth_len); 221 *tl++ = 0; /* stamp ?? */ 222 *tl++ = 0; /* NULL hostname */ 223 *tl++ = txdr_unsigned(cr->cr_uid); 224 *tl++ = txdr_unsigned(cr->cr_groups[0]); 225 grpsiz = (auth_len >> 2) - 5; 226 *tl++ = txdr_unsigned(grpsiz); 227 for (i = 1; i <= grpsiz; i++) 228 *tl++ = txdr_unsigned(cr->cr_groups[i]); 229 break; 230 } 231 232 /* 233 * And the verifier... 234 */ 235 tl = nfsm_build(u_int32_t *, 2 * NFSX_UNSIGNED); 236 *tl++ = txdr_unsigned(RPCAUTH_NULL); 237 *tl = 0; 238 mb->m_next = mrest; 239 mreq->m_pkthdr.len = authsiz + 10 * NFSX_UNSIGNED + mrest_len; 240 mreq->m_pkthdr.rcvif = NULL; 241 *mbp = mb; 242 return (mreq); 243 } 244 245 /* 246 * copies a uio scatter/gather list to an mbuf chain. 247 * NOTE: can ony handle iovcnt == 1 248 */ 249 int 250 nfsm_uiotombuf(struct uio *uiop, struct mbuf **mq, int siz, caddr_t *bpos) 251 { 252 char *uiocp; 253 struct mbuf *mp, *mp2; 254 int xfer, left, mlen; 255 int uiosiz, clflg, rem; 256 char *cp; 257 258 #ifdef DIAGNOSTIC 259 if (uiop->uio_iovcnt != 1) 260 panic("nfsm_uiotombuf: iovcnt != 1"); 261 #endif 262 263 if (siz > MLEN) /* or should it >= MCLBYTES ?? */ 264 clflg = 1; 265 else 266 clflg = 0; 267 rem = nfsm_rndup(siz)-siz; 268 mp = mp2 = *mq; 269 while (siz > 0) { 270 left = uiop->uio_iov->iov_len; 271 uiocp = uiop->uio_iov->iov_base; 272 if (left > siz) 273 left = siz; 274 uiosiz = left; 275 while (left > 0) { 276 mlen = M_TRAILINGSPACE(mp); 277 if (mlen == 0) { 278 MGET(mp, M_TRYWAIT, MT_DATA); 279 if (clflg) 280 MCLGET(mp, M_TRYWAIT); 281 mp->m_len = 0; 282 mp2->m_next = mp; 283 mp2 = mp; 284 mlen = M_TRAILINGSPACE(mp); 285 } 286 xfer = (left > mlen) ? mlen : left; 287 #ifdef notdef 288 /* Not Yet.. */ 289 if (uiop->uio_iov->iov_op != NULL) 290 (*(uiop->uio_iov->iov_op)) 291 (uiocp, mtod(mp, caddr_t)+mp->m_len, xfer); 292 else 293 #endif 294 if (uiop->uio_segflg == UIO_SYSSPACE) 295 bcopy(uiocp, mtod(mp, caddr_t)+mp->m_len, xfer); 296 else 297 copyin(uiocp, mtod(mp, caddr_t)+mp->m_len, xfer); 298 mp->m_len += xfer; 299 left -= xfer; 300 uiocp += xfer; 301 uiop->uio_offset += xfer; 302 uiop->uio_resid -= xfer; 303 } 304 uiop->uio_iov->iov_base = 305 (char *)uiop->uio_iov->iov_base + uiosiz; 306 uiop->uio_iov->iov_len -= uiosiz; 307 siz -= uiosiz; 308 } 309 if (rem > 0) { 310 if (rem > M_TRAILINGSPACE(mp)) { 311 MGET(mp, M_TRYWAIT, MT_DATA); 312 mp->m_len = 0; 313 mp2->m_next = mp; 314 } 315 cp = mtod(mp, caddr_t)+mp->m_len; 316 for (left = 0; left < rem; left++) 317 *cp++ = '\0'; 318 mp->m_len += rem; 319 *bpos = cp; 320 } else 321 *bpos = mtod(mp, caddr_t)+mp->m_len; 322 *mq = mp; 323 return (0); 324 } 325 326 /* 327 * Copy a string into mbufs for the hard cases... 328 */ 329 int 330 nfsm_strtmbuf(struct mbuf **mb, char **bpos, const char *cp, long siz) 331 { 332 struct mbuf *m1 = NULL, *m2; 333 long left, xfer, len, tlen; 334 u_int32_t *tl; 335 int putsize; 336 337 putsize = 1; 338 m2 = *mb; 339 left = M_TRAILINGSPACE(m2); 340 if (left > 0) { 341 tl = ((u_int32_t *)(*bpos)); 342 *tl++ = txdr_unsigned(siz); 343 putsize = 0; 344 left -= NFSX_UNSIGNED; 345 m2->m_len += NFSX_UNSIGNED; 346 if (left > 0) { 347 bcopy(cp, (caddr_t) tl, left); 348 siz -= left; 349 cp += left; 350 m2->m_len += left; 351 left = 0; 352 } 353 } 354 /* Loop around adding mbufs */ 355 while (siz > 0) { 356 MGET(m1, M_TRYWAIT, MT_DATA); 357 if (siz > MLEN) 358 MCLGET(m1, M_TRYWAIT); 359 m1->m_len = NFSMSIZ(m1); 360 m2->m_next = m1; 361 m2 = m1; 362 tl = mtod(m1, u_int32_t *); 363 tlen = 0; 364 if (putsize) { 365 *tl++ = txdr_unsigned(siz); 366 m1->m_len -= NFSX_UNSIGNED; 367 tlen = NFSX_UNSIGNED; 368 putsize = 0; 369 } 370 if (siz < m1->m_len) { 371 len = nfsm_rndup(siz); 372 xfer = siz; 373 if (xfer < len) 374 *(tl+(xfer>>2)) = 0; 375 } else { 376 xfer = len = m1->m_len; 377 } 378 bcopy(cp, (caddr_t) tl, xfer); 379 m1->m_len = len+tlen; 380 siz -= xfer; 381 cp += xfer; 382 } 383 *mb = m1; 384 *bpos = mtod(m1, caddr_t)+m1->m_len; 385 return (0); 386 } 387 388 /* 389 * Called once to initialize data structures... 390 */ 391 int 392 nfs_init(struct vfsconf *vfsp) 393 { 394 int i; 395 396 nfsmount_zone = uma_zcreate("NFSMOUNT", sizeof(struct nfsmount), 397 NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0); 398 rpc_vers = txdr_unsigned(RPC_VER2); 399 rpc_call = txdr_unsigned(RPC_CALL); 400 rpc_reply = txdr_unsigned(RPC_REPLY); 401 rpc_msgdenied = txdr_unsigned(RPC_MSGDENIED); 402 rpc_msgaccepted = txdr_unsigned(RPC_MSGACCEPTED); 403 rpc_mismatch = txdr_unsigned(RPC_MISMATCH); 404 rpc_autherr = txdr_unsigned(RPC_AUTHERR); 405 rpc_auth_unix = txdr_unsigned(RPCAUTH_UNIX); 406 nfs_true = txdr_unsigned(TRUE); 407 nfs_false = txdr_unsigned(FALSE); 408 nfs_xdrneg1 = txdr_unsigned(-1); 409 nfs_ticks = (hz * NFS_TICKINTVL + 500) / 1000; 410 if (nfs_ticks < 1) 411 nfs_ticks = 1; 412 /* Ensure async daemons disabled */ 413 for (i = 0; i < NFS_MAXASYNCDAEMON; i++) { 414 nfs_iodwant[i] = NULL; 415 nfs_iodmount[i] = NULL; 416 } 417 nfs_nhinit(); /* Init the nfsnode table */ 418 419 /* 420 * Initialize reply list and start timer 421 */ 422 TAILQ_INIT(&nfs_reqq); 423 callout_init(&nfs_callout, 0); 424 mtx_init(&nfs_reqq_mtx, "NFS reqq lock", NULL, MTX_DEF); 425 mtx_init(&nfs_reply_mtx, "Synch NFS reply posting", NULL, MTX_DEF); 426 427 nfs_pbuf_freecnt = nswbuf / 2 + 1; 428 429 return (0); 430 } 431 432 int 433 nfs_uninit(struct vfsconf *vfsp) 434 { 435 int i; 436 437 callout_stop(&nfs_callout); 438 439 KASSERT(TAILQ_EMPTY(&nfs_reqq), 440 ("nfs_uninit: request queue not empty")); 441 442 /* 443 * Tell all nfsiod processes to exit. Clear nfs_iodmax, and wakeup 444 * any sleeping nfsiods so they check nfs_iodmax and exit. 445 */ 446 nfs_iodmax = 0; 447 for (i = 0; i < nfs_numasync; i++) 448 if (nfs_iodwant[i]) 449 wakeup(&nfs_iodwant[i]); 450 /* The last nfsiod to exit will wake us up when nfs_numasync hits 0 */ 451 while (nfs_numasync) 452 tsleep(&nfs_numasync, PWAIT, "ioddie", 0); 453 454 nfs_nhuninit(); 455 uma_zdestroy(nfsmount_zone); 456 return (0); 457 } 458 459 /* 460 * Attribute cache routines. 461 * nfs_loadattrcache() - loads or updates the cache contents from attributes 462 * that are on the mbuf list 463 * nfs_getattrcache() - returns valid attributes if found in cache, returns 464 * error otherwise 465 */ 466 467 /* 468 * Load the attribute cache (that lives in the nfsnode entry) with 469 * the values on the mbuf list and 470 * Iff vap not NULL 471 * copy the attributes to *vaper 472 */ 473 int 474 nfs_loadattrcache(struct vnode **vpp, struct mbuf **mdp, caddr_t *dposp, 475 struct vattr *vaper, int dontshrink) 476 { 477 struct vnode *vp = *vpp; 478 struct vattr *vap; 479 struct nfs_fattr *fp; 480 struct nfsnode *np; 481 int32_t t1; 482 caddr_t cp2; 483 int rdev; 484 struct mbuf *md; 485 enum vtype vtyp; 486 u_short vmode; 487 struct timespec mtime, mtime_save; 488 int v3 = NFS_ISV3(vp); 489 490 md = *mdp; 491 t1 = (mtod(md, caddr_t) + md->m_len) - *dposp; 492 cp2 = nfsm_disct(mdp, dposp, NFSX_FATTR(v3), t1, M_TRYWAIT); 493 if (cp2 == NULL) 494 return EBADRPC; 495 fp = (struct nfs_fattr *)cp2; 496 if (v3) { 497 vtyp = nfsv3tov_type(fp->fa_type); 498 vmode = fxdr_unsigned(u_short, fp->fa_mode); 499 rdev = makedev(fxdr_unsigned(int, fp->fa3_rdev.specdata1), 500 fxdr_unsigned(int, fp->fa3_rdev.specdata2)); 501 fxdr_nfsv3time(&fp->fa3_mtime, &mtime); 502 } else { 503 vtyp = nfsv2tov_type(fp->fa_type); 504 vmode = fxdr_unsigned(u_short, fp->fa_mode); 505 /* 506 * XXX 507 * 508 * The duplicate information returned in fa_type and fa_mode 509 * is an ambiguity in the NFS version 2 protocol. 510 * 511 * VREG should be taken literally as a regular file. If a 512 * server intents to return some type information differently 513 * in the upper bits of the mode field (e.g. for sockets, or 514 * FIFOs), NFSv2 mandates fa_type to be VNON. Anyway, we 515 * leave the examination of the mode bits even in the VREG 516 * case to avoid breakage for bogus servers, but we make sure 517 * that there are actually type bits set in the upper part of 518 * fa_mode (and failing that, trust the va_type field). 519 * 520 * NFSv3 cleared the issue, and requires fa_mode to not 521 * contain any type information (while also introduing sockets 522 * and FIFOs for fa_type). 523 */ 524 if (vtyp == VNON || (vtyp == VREG && (vmode & S_IFMT) != 0)) 525 vtyp = IFTOVT(vmode); 526 rdev = fxdr_unsigned(int32_t, fp->fa2_rdev); 527 fxdr_nfsv2time(&fp->fa2_mtime, &mtime); 528 529 /* 530 * Really ugly NFSv2 kludge. 531 */ 532 if (vtyp == VCHR && rdev == 0xffffffff) 533 vtyp = VFIFO; 534 } 535 536 /* 537 * If v_type == VNON it is a new node, so fill in the v_type, 538 * n_mtime fields. Check to see if it represents a special 539 * device, and if so, check for a possible alias. Once the 540 * correct vnode has been obtained, fill in the rest of the 541 * information. 542 */ 543 np = VTONFS(vp); 544 if (vp->v_type != vtyp) { 545 vp->v_type = vtyp; 546 if (vp->v_type == VFIFO) 547 vp->v_op = &nfs_fifoops; 548 np->n_mtime = mtime; 549 } 550 vap = &np->n_vattr; 551 vap->va_type = vtyp; 552 vap->va_mode = (vmode & 07777); 553 vap->va_rdev = rdev; 554 mtime_save = vap->va_mtime; 555 vap->va_mtime = mtime; 556 vap->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0]; 557 if (v3) { 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_hyper(&fp->fa3_size); 562 vap->va_blocksize = NFS_FABLKSIZE; 563 vap->va_bytes = fxdr_hyper(&fp->fa3_used); 564 vap->va_fileid = fxdr_unsigned(int32_t, 565 fp->fa3_fileid.nfsuquad[1]); 566 fxdr_nfsv3time(&fp->fa3_atime, &vap->va_atime); 567 fxdr_nfsv3time(&fp->fa3_ctime, &vap->va_ctime); 568 vap->va_flags = 0; 569 vap->va_filerev = 0; 570 } else { 571 vap->va_nlink = fxdr_unsigned(u_short, fp->fa_nlink); 572 vap->va_uid = fxdr_unsigned(uid_t, fp->fa_uid); 573 vap->va_gid = fxdr_unsigned(gid_t, fp->fa_gid); 574 vap->va_size = fxdr_unsigned(u_int32_t, fp->fa2_size); 575 vap->va_blocksize = fxdr_unsigned(int32_t, fp->fa2_blocksize); 576 vap->va_bytes = (u_quad_t)fxdr_unsigned(int32_t, fp->fa2_blocks) 577 * NFS_FABLKSIZE; 578 vap->va_fileid = fxdr_unsigned(int32_t, fp->fa2_fileid); 579 fxdr_nfsv2time(&fp->fa2_atime, &vap->va_atime); 580 vap->va_flags = 0; 581 vap->va_ctime.tv_sec = fxdr_unsigned(u_int32_t, 582 fp->fa2_ctime.nfsv2_sec); 583 vap->va_ctime.tv_nsec = 0; 584 vap->va_gen = fxdr_unsigned(u_int32_t, fp->fa2_ctime.nfsv2_usec); 585 vap->va_filerev = 0; 586 } 587 np->n_attrstamp = time_second; 588 if (vap->va_size != np->n_size) { 589 if (vap->va_type == VREG) { 590 if (dontshrink && vap->va_size < np->n_size) { 591 /* 592 * We've been told not to shrink the file; 593 * zero np->n_attrstamp to indicate that 594 * the attributes are stale. 595 */ 596 vap->va_size = np->n_size; 597 np->n_attrstamp = 0; 598 } else if (np->n_flag & NMODIFIED) { 599 /* 600 * We've modified the file: Use the larger 601 * of our size, and the server's size. 602 */ 603 if (vap->va_size < np->n_size) { 604 vap->va_size = np->n_size; 605 } else { 606 np->n_size = vap->va_size; 607 np->n_flag |= NSIZECHANGED; 608 } 609 } else { 610 np->n_size = vap->va_size; 611 np->n_flag |= NSIZECHANGED; 612 } 613 vnode_pager_setsize(vp, np->n_size); 614 } else { 615 np->n_size = vap->va_size; 616 } 617 } 618 /* 619 * The following checks are added to prevent a race between (say) 620 * a READDIR+ and a WRITE. 621 * READDIR+, WRITE requests sent out. 622 * READDIR+ resp, WRITE resp received on client. 623 * However, the WRITE resp was handled before the READDIR+ resp 624 * causing the post op attrs from the write to be loaded first 625 * and the attrs from the READDIR+ to be loaded later. If this 626 * happens, we have stale attrs loaded into the attrcache. 627 * We detect this by for the mtime moving back. We invalidate the 628 * attrcache when this happens. 629 */ 630 if (timespeccmp(&mtime_save, &vap->va_mtime, >)) 631 /* Size changed or mtime went backwards */ 632 np->n_attrstamp = 0; 633 if (vaper != NULL) { 634 bcopy((caddr_t)vap, (caddr_t)vaper, sizeof(*vap)); 635 if (np->n_flag & NCHG) { 636 if (np->n_flag & NACC) 637 vaper->va_atime = np->n_atim; 638 if (np->n_flag & NUPD) 639 vaper->va_mtime = np->n_mtim; 640 } 641 } 642 return (0); 643 } 644 645 #ifdef NFS_ACDEBUG 646 #include <sys/sysctl.h> 647 SYSCTL_DECL(_vfs_nfs); 648 static int nfs_acdebug; 649 SYSCTL_INT(_vfs_nfs, OID_AUTO, acdebug, CTLFLAG_RW, &nfs_acdebug, 0, ""); 650 #endif 651 652 /* 653 * Check the time stamp 654 * If the cache is valid, copy contents to *vap and return 0 655 * otherwise return an error 656 */ 657 int 658 nfs_getattrcache(struct vnode *vp, struct vattr *vaper) 659 { 660 struct nfsnode *np; 661 struct vattr *vap; 662 struct nfsmount *nmp; 663 int timeo; 664 665 np = VTONFS(vp); 666 vap = &np->n_vattr; 667 nmp = VFSTONFS(vp->v_mount); 668 /* XXX n_mtime doesn't seem to be updated on a miss-and-reload */ 669 timeo = (time_second - np->n_mtime.tv_sec) / 10; 670 671 #ifdef NFS_ACDEBUG 672 if (nfs_acdebug>1) 673 printf("nfs_getattrcache: initial timeo = %d\n", timeo); 674 #endif 675 676 if (vap->va_type == VDIR) { 677 if ((np->n_flag & NMODIFIED) || timeo < nmp->nm_acdirmin) 678 timeo = nmp->nm_acdirmin; 679 else if (timeo > nmp->nm_acdirmax) 680 timeo = nmp->nm_acdirmax; 681 } else { 682 if ((np->n_flag & NMODIFIED) || timeo < nmp->nm_acregmin) 683 timeo = nmp->nm_acregmin; 684 else if (timeo > nmp->nm_acregmax) 685 timeo = nmp->nm_acregmax; 686 } 687 688 #ifdef NFS_ACDEBUG 689 if (nfs_acdebug > 2) 690 printf("acregmin %d; acregmax %d; acdirmin %d; acdirmax %d\n", 691 nmp->nm_acregmin, nmp->nm_acregmax, 692 nmp->nm_acdirmin, nmp->nm_acdirmax); 693 694 if (nfs_acdebug) 695 printf("nfs_getattrcache: age = %d; final timeo = %d\n", 696 (time_second - np->n_attrstamp), timeo); 697 #endif 698 699 if ((time_second - np->n_attrstamp) >= timeo) { 700 nfsstats.attrcache_misses++; 701 return (ENOENT); 702 } 703 nfsstats.attrcache_hits++; 704 if (vap->va_size != np->n_size) { 705 if (vap->va_type == VREG) { 706 if (np->n_flag & NMODIFIED) { 707 if (vap->va_size < np->n_size) 708 vap->va_size = np->n_size; 709 else 710 np->n_size = vap->va_size; 711 } else { 712 np->n_size = vap->va_size; 713 } 714 vnode_pager_setsize(vp, np->n_size); 715 } else { 716 np->n_size = vap->va_size; 717 } 718 } 719 bcopy((caddr_t)vap, (caddr_t)vaper, sizeof(struct vattr)); 720 if (np->n_flag & NCHG) { 721 if (np->n_flag & NACC) 722 vaper->va_atime = np->n_atim; 723 if (np->n_flag & NUPD) 724 vaper->va_mtime = np->n_mtim; 725 } 726 return (0); 727 } 728 729 static nfsuint64 nfs_nullcookie = { { 0, 0 } }; 730 /* 731 * This function finds the directory cookie that corresponds to the 732 * logical byte offset given. 733 */ 734 nfsuint64 * 735 nfs_getcookie(struct nfsnode *np, off_t off, int add) 736 { 737 struct nfsdmap *dp, *dp2; 738 int pos; 739 740 pos = (uoff_t)off / NFS_DIRBLKSIZ; 741 if (pos == 0 || off < 0) { 742 #ifdef DIAGNOSTIC 743 if (add) 744 panic("nfs getcookie add at <= 0"); 745 #endif 746 return (&nfs_nullcookie); 747 } 748 pos--; 749 dp = LIST_FIRST(&np->n_cookies); 750 if (!dp) { 751 if (add) { 752 MALLOC(dp, struct nfsdmap *, sizeof (struct nfsdmap), 753 M_NFSDIROFF, M_WAITOK); 754 dp->ndm_eocookie = 0; 755 LIST_INSERT_HEAD(&np->n_cookies, dp, ndm_list); 756 } else 757 return (NULL); 758 } 759 while (pos >= NFSNUMCOOKIES) { 760 pos -= NFSNUMCOOKIES; 761 if (LIST_NEXT(dp, ndm_list)) { 762 if (!add && dp->ndm_eocookie < NFSNUMCOOKIES && 763 pos >= dp->ndm_eocookie) 764 return (NULL); 765 dp = LIST_NEXT(dp, ndm_list); 766 } else if (add) { 767 MALLOC(dp2, struct nfsdmap *, sizeof (struct nfsdmap), 768 M_NFSDIROFF, M_WAITOK); 769 dp2->ndm_eocookie = 0; 770 LIST_INSERT_AFTER(dp, dp2, ndm_list); 771 dp = dp2; 772 } else 773 return (NULL); 774 } 775 if (pos >= dp->ndm_eocookie) { 776 if (add) 777 dp->ndm_eocookie = pos + 1; 778 else 779 return (NULL); 780 } 781 return (&dp->ndm_cookies[pos]); 782 } 783 784 /* 785 * Invalidate cached directory information, except for the actual directory 786 * blocks (which are invalidated separately). 787 * Done mainly to avoid the use of stale offset cookies. 788 */ 789 void 790 nfs_invaldir(struct vnode *vp) 791 { 792 struct nfsnode *np = VTONFS(vp); 793 794 #ifdef DIAGNOSTIC 795 if (vp->v_type != VDIR) 796 panic("nfs: invaldir not dir"); 797 #endif 798 np->n_direofoffset = 0; 799 np->n_cookieverf.nfsuquad[0] = 0; 800 np->n_cookieverf.nfsuquad[1] = 0; 801 if (LIST_FIRST(&np->n_cookies)) 802 LIST_FIRST(&np->n_cookies)->ndm_eocookie = 0; 803 } 804 805 /* 806 * The write verifier has changed (probably due to a server reboot), so all 807 * B_NEEDCOMMIT blocks will have to be written again. Since they are on the 808 * dirty block list as B_DELWRI, all this takes is clearing the B_NEEDCOMMIT 809 * and B_CLUSTEROK flags. Once done the new write verifier can be set for the 810 * mount point. 811 * 812 * B_CLUSTEROK must be cleared along with B_NEEDCOMMIT because stage 1 data 813 * writes are not clusterable. 814 */ 815 void 816 nfs_clearcommit(struct mount *mp) 817 { 818 struct vnode *vp, *nvp; 819 struct buf *bp, *nbp; 820 int s; 821 822 GIANT_REQUIRED; 823 824 s = splbio(); 825 MNT_ILOCK(mp); 826 MNT_VNODE_FOREACH(vp, mp, nvp) { 827 VI_LOCK(vp); 828 if (vp->v_iflag & VI_DOOMED) { 829 VI_UNLOCK(vp); 830 continue; 831 } 832 MNT_IUNLOCK(mp); 833 TAILQ_FOREACH_SAFE(bp, &vp->v_bufobj.bo_dirty.bv_hd, b_bobufs, nbp) { 834 if (BUF_REFCNT(bp) == 0 && 835 (bp->b_flags & (B_DELWRI | B_NEEDCOMMIT)) 836 == (B_DELWRI | B_NEEDCOMMIT)) 837 bp->b_flags &= ~(B_NEEDCOMMIT | B_CLUSTEROK); 838 } 839 VI_UNLOCK(vp); 840 MNT_ILOCK(mp); 841 } 842 MNT_IUNLOCK(mp); 843 splx(s); 844 } 845 846 /* 847 * Helper functions for former macros. Some of these should be 848 * moved to their callers. 849 */ 850 851 int 852 nfsm_mtofh_xx(struct vnode *d, struct vnode **v, int v3, int *f, 853 struct mbuf **md, caddr_t *dpos) 854 { 855 struct nfsnode *ttnp; 856 struct vnode *ttvp; 857 nfsfh_t *ttfhp; 858 u_int32_t *tl; 859 int ttfhsize; 860 int t1; 861 862 if (v3) { 863 tl = nfsm_dissect_xx(NFSX_UNSIGNED, md, dpos); 864 if (tl == NULL) 865 return EBADRPC; 866 *f = fxdr_unsigned(int, *tl); 867 } else 868 *f = 1; 869 if (*f) { 870 t1 = nfsm_getfh_xx(&ttfhp, &ttfhsize, (v3), md, dpos); 871 if (t1 != 0) 872 return t1; 873 t1 = nfs_nget(d->v_mount, ttfhp, ttfhsize, &ttnp, LK_EXCLUSIVE); 874 if (t1 != 0) 875 return t1; 876 *v = NFSTOV(ttnp); 877 } 878 if (v3) { 879 tl = nfsm_dissect_xx(NFSX_UNSIGNED, md, dpos); 880 if (tl == NULL) 881 return EBADRPC; 882 if (*f) 883 *f = fxdr_unsigned(int, *tl); 884 else if (fxdr_unsigned(int, *tl)) 885 nfsm_adv_xx(NFSX_V3FATTR, md, dpos); 886 } 887 if (*f) { 888 ttvp = *v; 889 t1 = nfs_loadattrcache(&ttvp, md, dpos, NULL, 0); 890 if (t1) 891 return t1; 892 *v = ttvp; 893 } 894 return 0; 895 } 896 897 int 898 nfsm_getfh_xx(nfsfh_t **f, int *s, int v3, struct mbuf **md, caddr_t *dpos) 899 { 900 u_int32_t *tl; 901 902 if (v3) { 903 tl = nfsm_dissect_xx(NFSX_UNSIGNED, md, dpos); 904 if (tl == NULL) 905 return EBADRPC; 906 *s = fxdr_unsigned(int, *tl); 907 if (*s <= 0 || *s > NFSX_V3FHMAX) 908 return EBADRPC; 909 } else 910 *s = NFSX_V2FH; 911 *f = nfsm_dissect_xx(nfsm_rndup(*s), md, dpos); 912 if (*f == NULL) 913 return EBADRPC; 914 else 915 return 0; 916 } 917 918 919 int 920 nfsm_loadattr_xx(struct vnode **v, struct vattr *va, struct mbuf **md, 921 caddr_t *dpos) 922 { 923 int t1; 924 925 struct vnode *ttvp = *v; 926 t1 = nfs_loadattrcache(&ttvp, md, dpos, va, 0); 927 if (t1 != 0) 928 return t1; 929 *v = ttvp; 930 return 0; 931 } 932 933 int 934 nfsm_postop_attr_xx(struct vnode **v, int *f, struct mbuf **md, 935 caddr_t *dpos) 936 { 937 u_int32_t *tl; 938 int t1; 939 940 struct vnode *ttvp = *v; 941 tl = nfsm_dissect_xx(NFSX_UNSIGNED, md, dpos); 942 if (tl == NULL) 943 return EBADRPC; 944 *f = fxdr_unsigned(int, *tl); 945 if (*f != 0) { 946 t1 = nfs_loadattrcache(&ttvp, md, dpos, NULL, 1); 947 if (t1 != 0) { 948 *f = 0; 949 return t1; 950 } 951 *v = ttvp; 952 } 953 return 0; 954 } 955 956 int 957 nfsm_wcc_data_xx(struct vnode **v, int *f, struct mbuf **md, caddr_t *dpos) 958 { 959 u_int32_t *tl; 960 int ttattrf, ttretf = 0; 961 int t1; 962 963 tl = nfsm_dissect_xx(NFSX_UNSIGNED, md, dpos); 964 if (tl == NULL) 965 return EBADRPC; 966 if (*tl == nfs_true) { 967 tl = nfsm_dissect_xx(6 * NFSX_UNSIGNED, md, dpos); 968 if (tl == NULL) 969 return EBADRPC; 970 if (*f) 971 ttretf = (VTONFS(*v)->n_mtime.tv_sec == fxdr_unsigned(u_int32_t, *(tl + 2)) && 972 VTONFS(*v)->n_mtime.tv_nsec == fxdr_unsigned(u_int32_t, *(tl + 3))); 973 } 974 t1 = nfsm_postop_attr_xx(v, &ttattrf, md, dpos); 975 if (t1) 976 return t1; 977 if (*f) 978 *f = ttretf; 979 else 980 *f = ttattrf; 981 return 0; 982 } 983 984 int 985 nfsm_strtom_xx(const char *a, int s, int m, struct mbuf **mb, caddr_t *bpos) 986 { 987 u_int32_t *tl; 988 int t1; 989 990 if (s > m) 991 return ENAMETOOLONG; 992 t1 = nfsm_rndup(s) + NFSX_UNSIGNED; 993 if (t1 <= M_TRAILINGSPACE(*mb)) { 994 tl = nfsm_build_xx(t1, mb, bpos); 995 *tl++ = txdr_unsigned(s); 996 *(tl + ((t1 >> 2) - 2)) = 0; 997 bcopy(a, tl, s); 998 } else { 999 t1 = nfsm_strtmbuf(mb, bpos, a, s); 1000 if (t1 != 0) 1001 return t1; 1002 } 1003 return 0; 1004 } 1005 1006 int 1007 nfsm_fhtom_xx(struct vnode *v, int v3, struct mbuf **mb, caddr_t *bpos) 1008 { 1009 u_int32_t *tl; 1010 int t1; 1011 caddr_t cp; 1012 1013 if (v3) { 1014 t1 = nfsm_rndup(VTONFS(v)->n_fhsize) + NFSX_UNSIGNED; 1015 if (t1 < M_TRAILINGSPACE(*mb)) { 1016 tl = nfsm_build_xx(t1, mb, bpos); 1017 *tl++ = txdr_unsigned(VTONFS(v)->n_fhsize); 1018 *(tl + ((t1 >> 2) - 2)) = 0; 1019 bcopy(VTONFS(v)->n_fhp, tl, VTONFS(v)->n_fhsize); 1020 } else { 1021 t1 = nfsm_strtmbuf(mb, bpos, 1022 (const char *)VTONFS(v)->n_fhp, 1023 VTONFS(v)->n_fhsize); 1024 if (t1 != 0) 1025 return t1; 1026 } 1027 } else { 1028 cp = nfsm_build_xx(NFSX_V2FH, mb, bpos); 1029 bcopy(VTONFS(v)->n_fhp, cp, NFSX_V2FH); 1030 } 1031 return 0; 1032 } 1033 1034 void 1035 nfsm_v3attrbuild_xx(struct vattr *va, int full, struct mbuf **mb, 1036 caddr_t *bpos) 1037 { 1038 u_int32_t *tl; 1039 1040 if (va->va_mode != (mode_t)VNOVAL) { 1041 tl = nfsm_build_xx(2 * NFSX_UNSIGNED, mb, bpos); 1042 *tl++ = nfs_true; 1043 *tl = txdr_unsigned(va->va_mode); 1044 } else { 1045 tl = nfsm_build_xx(NFSX_UNSIGNED, mb, bpos); 1046 *tl = nfs_false; 1047 } 1048 if (full && va->va_uid != (uid_t)VNOVAL) { 1049 tl = nfsm_build_xx(2 * NFSX_UNSIGNED, mb, bpos); 1050 *tl++ = nfs_true; 1051 *tl = txdr_unsigned(va->va_uid); 1052 } else { 1053 tl = nfsm_build_xx(NFSX_UNSIGNED, mb, bpos); 1054 *tl = nfs_false; 1055 } 1056 if (full && va->va_gid != (gid_t)VNOVAL) { 1057 tl = nfsm_build_xx(2 * NFSX_UNSIGNED, mb, bpos); 1058 *tl++ = nfs_true; 1059 *tl = txdr_unsigned(va->va_gid); 1060 } else { 1061 tl = nfsm_build_xx(NFSX_UNSIGNED, mb, bpos); 1062 *tl = nfs_false; 1063 } 1064 if (full && va->va_size != VNOVAL) { 1065 tl = nfsm_build_xx(3 * NFSX_UNSIGNED, mb, bpos); 1066 *tl++ = nfs_true; 1067 txdr_hyper(va->va_size, tl); 1068 } else { 1069 tl = nfsm_build_xx(NFSX_UNSIGNED, mb, bpos); 1070 *tl = nfs_false; 1071 } 1072 if (va->va_atime.tv_sec != VNOVAL) { 1073 if (va->va_atime.tv_sec != time_second) { 1074 tl = nfsm_build_xx(3 * NFSX_UNSIGNED, mb, bpos); 1075 *tl++ = txdr_unsigned(NFSV3SATTRTIME_TOCLIENT); 1076 txdr_nfsv3time(&va->va_atime, tl); 1077 } else { 1078 tl = nfsm_build_xx(NFSX_UNSIGNED, mb, bpos); 1079 *tl = txdr_unsigned(NFSV3SATTRTIME_TOSERVER); 1080 } 1081 } else { 1082 tl = nfsm_build_xx(NFSX_UNSIGNED, mb, bpos); 1083 *tl = txdr_unsigned(NFSV3SATTRTIME_DONTCHANGE); 1084 } 1085 if (va->va_mtime.tv_sec != VNOVAL) { 1086 if (va->va_mtime.tv_sec != time_second) { 1087 tl = nfsm_build_xx(3 * NFSX_UNSIGNED, mb, bpos); 1088 *tl++ = txdr_unsigned(NFSV3SATTRTIME_TOCLIENT); 1089 txdr_nfsv3time(&va->va_mtime, tl); 1090 } else { 1091 tl = nfsm_build_xx(NFSX_UNSIGNED, mb, bpos); 1092 *tl = txdr_unsigned(NFSV3SATTRTIME_TOSERVER); 1093 } 1094 } else { 1095 tl = nfsm_build_xx(NFSX_UNSIGNED, mb, bpos); 1096 *tl = txdr_unsigned(NFSV3SATTRTIME_DONTCHANGE); 1097 } 1098 }
Cache object: 38725c4f48d3ab2fbebdbbf7f1b00c3f
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