Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/fs/nfsclient/nfs_clcomsubs.c
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1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1989, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * Rick Macklem at The University of Guelph. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 */ 35 36 #include <sys/cdefs.h> 37 __FBSDID("$FreeBSD$"); 38 39 /* 40 * These functions support the macros and help fiddle mbuf chains for 41 * the nfs op functions. They do things like create the rpc header and 42 * copy data between mbuf chains and uio lists. 43 */ 44 #include <fs/nfs/nfsport.h> 45 46 extern struct nfsstatsv1 nfsstatsv1; 47 extern int ncl_mbuf_mlen; 48 extern enum vtype newnv2tov_type[8]; 49 extern enum vtype nv34tov_type[8]; 50 NFSCLSTATEMUTEX; 51 52 static nfsuint64 nfs_nullcookie = {{ 0, 0 }}; 53 54 /* 55 * copies a uio scatter/gather list to an mbuf chain. 56 * NOTE: can ony handle iovcnt == 1 57 */ 58 void 59 nfsm_uiombuf(struct nfsrv_descript *nd, struct uio *uiop, int siz) 60 { 61 char *uiocp; 62 struct mbuf *mp, *mp2; 63 int xfer, left, mlen; 64 int uiosiz, clflg, rem; 65 char *mcp, *tcp; 66 67 KASSERT(uiop->uio_iovcnt == 1, ("nfsm_uiotombuf: iovcnt != 1")); 68 69 if (siz > ncl_mbuf_mlen) /* or should it >= MCLBYTES ?? */ 70 clflg = 1; 71 else 72 clflg = 0; 73 rem = NFSM_RNDUP(siz) - siz; 74 mp = mp2 = nd->nd_mb; 75 mcp = nd->nd_bpos; 76 while (siz > 0) { 77 KASSERT((nd->nd_flag & ND_EXTPG) != 0 || mcp == 78 mtod(mp, char *) + mp->m_len, ("nfsm_uiombuf: mcp wrong")); 79 left = uiop->uio_iov->iov_len; 80 uiocp = uiop->uio_iov->iov_base; 81 if (left > siz) 82 left = siz; 83 uiosiz = left; 84 while (left > 0) { 85 if ((nd->nd_flag & ND_EXTPG) != 0) 86 mlen = nd->nd_bextpgsiz; 87 else 88 mlen = M_TRAILINGSPACE(mp); 89 if (mlen == 0) { 90 if ((nd->nd_flag & ND_EXTPG) != 0) { 91 mp = nfsm_add_ext_pgs(mp, 92 nd->nd_maxextsiz, &nd->nd_bextpg); 93 mcp = (char *)(void *)PHYS_TO_DMAP( 94 mp->m_epg_pa[nd->nd_bextpg]); 95 nd->nd_bextpgsiz = mlen = PAGE_SIZE; 96 } else { 97 if (clflg) 98 NFSMCLGET(mp, M_WAITOK); 99 else 100 NFSMGET(mp); 101 mp->m_len = 0; 102 mlen = M_TRAILINGSPACE(mp); 103 mcp = mtod(mp, char *); 104 mp2->m_next = mp; 105 mp2 = mp; 106 } 107 } 108 xfer = (left > mlen) ? mlen : left; 109 if (uiop->uio_segflg == UIO_SYSSPACE) 110 NFSBCOPY(uiocp, mcp, xfer); 111 else 112 copyin(uiocp, mcp, xfer); 113 mp->m_len += xfer; 114 left -= xfer; 115 uiocp += xfer; 116 mcp += xfer; 117 if ((nd->nd_flag & ND_EXTPG) != 0) { 118 nd->nd_bextpgsiz -= xfer; 119 mp->m_epg_last_len += xfer; 120 } 121 uiop->uio_offset += xfer; 122 uiop->uio_resid -= xfer; 123 } 124 tcp = (char *)uiop->uio_iov->iov_base; 125 tcp += uiosiz; 126 uiop->uio_iov->iov_base = (void *)tcp; 127 uiop->uio_iov->iov_len -= uiosiz; 128 siz -= uiosiz; 129 } 130 if (rem > 0) { 131 if ((nd->nd_flag & ND_EXTPG) == 0 && rem > 132 M_TRAILINGSPACE(mp)) { 133 NFSMGET(mp); 134 mp->m_len = 0; 135 mp2->m_next = mp; 136 mcp = mtod(mp, char *); 137 } else if ((nd->nd_flag & ND_EXTPG) != 0 && rem > 138 nd->nd_bextpgsiz) { 139 mp = nfsm_add_ext_pgs(mp, nd->nd_maxextsiz, 140 &nd->nd_bextpg); 141 mcp = (char *)(void *) 142 PHYS_TO_DMAP(mp->m_epg_pa[nd->nd_bextpg]); 143 nd->nd_bextpgsiz = PAGE_SIZE; 144 } 145 for (left = 0; left < rem; left++) 146 *mcp++ = '\0'; 147 mp->m_len += rem; 148 if ((nd->nd_flag & ND_EXTPG) != 0) { 149 nd->nd_bextpgsiz -= rem; 150 mp->m_epg_last_len += rem; 151 } 152 } 153 nd->nd_bpos = mcp; 154 nd->nd_mb = mp; 155 } 156 157 /* 158 * copies a uio scatter/gather list to an mbuf chain. 159 * This version returns the mbuf list and does not use "nd". 160 * NOTE: can ony handle iovcnt == 1 161 */ 162 struct mbuf * 163 nfsm_uiombuflist(struct uio *uiop, int siz, u_int maxext) 164 { 165 char *uiocp; 166 struct mbuf *mp, *mp2, *firstmp; 167 int extpg, extpgsiz = 0, i, left, mlen, rem, xfer; 168 int uiosiz, clflg; 169 char *mcp, *tcp; 170 171 KASSERT(uiop->uio_iovcnt == 1, ("nfsm_uiotombuf: iovcnt != 1")); 172 173 if (maxext > 0) { 174 mp = mb_alloc_ext_plus_pages(PAGE_SIZE, M_WAITOK); 175 mcp = (char *)(void *)PHYS_TO_DMAP(mp->m_epg_pa[0]); 176 extpg = 0; 177 extpgsiz = PAGE_SIZE; 178 } else { 179 if (siz > ncl_mbuf_mlen) /* or should it >= MCLBYTES ?? */ 180 clflg = 1; 181 else 182 clflg = 0; 183 if (clflg != 0) 184 NFSMCLGET(mp, M_WAITOK); 185 else 186 NFSMGET(mp); 187 mcp = mtod(mp, char *); 188 } 189 mp->m_len = 0; 190 firstmp = mp2 = mp; 191 rem = NFSM_RNDUP(siz) - siz; 192 while (siz > 0) { 193 left = uiop->uio_iov->iov_len; 194 uiocp = uiop->uio_iov->iov_base; 195 if (left > siz) 196 left = siz; 197 uiosiz = left; 198 while (left > 0) { 199 if (maxext > 0) 200 mlen = extpgsiz; 201 else 202 mlen = M_TRAILINGSPACE(mp); 203 if (mlen == 0) { 204 if (maxext > 0) { 205 mp = nfsm_add_ext_pgs(mp, maxext, 206 &extpg); 207 mlen = extpgsiz = PAGE_SIZE; 208 mcp = (char *)(void *)PHYS_TO_DMAP( 209 mp->m_epg_pa[extpg]); 210 } else { 211 if (clflg) 212 NFSMCLGET(mp, M_WAITOK); 213 else 214 NFSMGET(mp); 215 mcp = mtod(mp, char *); 216 mlen = M_TRAILINGSPACE(mp); 217 mp->m_len = 0; 218 mp2->m_next = mp; 219 mp2 = mp; 220 } 221 } 222 xfer = (left > mlen) ? mlen : left; 223 if (uiop->uio_segflg == UIO_SYSSPACE) 224 NFSBCOPY(uiocp, mcp, xfer); 225 else 226 copyin(uiocp, mcp, xfer); 227 mp->m_len += xfer; 228 mcp += xfer; 229 if (maxext > 0) { 230 extpgsiz -= xfer; 231 mp->m_epg_last_len += xfer; 232 } 233 left -= xfer; 234 uiocp += xfer; 235 uiop->uio_offset += xfer; 236 uiop->uio_resid -= xfer; 237 } 238 tcp = (char *)uiop->uio_iov->iov_base; 239 tcp += uiosiz; 240 uiop->uio_iov->iov_base = (void *)tcp; 241 uiop->uio_iov->iov_len -= uiosiz; 242 siz -= uiosiz; 243 } 244 if (rem > 0) { 245 KASSERT((mp->m_flags & M_EXTPG) != 0 || 246 rem <= M_TRAILINGSPACE(mp), 247 ("nfsm_uiombuflist: no space for padding")); 248 for (i = 0; i < rem; i++) 249 *mcp++ = '\0'; 250 mp->m_len += rem; 251 if (maxext > 0) 252 mp->m_epg_last_len += rem; 253 } 254 return (firstmp); 255 } 256 257 /* 258 * Load vnode attributes from the xdr file attributes. 259 * Returns EBADRPC if they can't be parsed, 0 otherwise. 260 */ 261 int 262 nfsm_loadattr(struct nfsrv_descript *nd, struct nfsvattr *nap) 263 { 264 struct nfs_fattr *fp; 265 int error = 0; 266 267 if (nd->nd_flag & ND_NFSV4) { 268 error = nfsv4_loadattr(nd, NULL, nap, NULL, NULL, 0, NULL, 269 NULL, NULL, NULL, NULL, 0, NULL, NULL, NULL, NULL, NULL); 270 } else if (nd->nd_flag & ND_NFSV3) { 271 NFSM_DISSECT(fp, struct nfs_fattr *, NFSX_V3FATTR); 272 nap->na_type = nfsv34tov_type(fp->fa_type); 273 nap->na_mode = fxdr_unsigned(u_short, fp->fa_mode); 274 nap->na_rdev = NFSMAKEDEV( 275 fxdr_unsigned(int, fp->fa3_rdev.specdata1), 276 fxdr_unsigned(int, fp->fa3_rdev.specdata2)); 277 nap->na_nlink = fxdr_unsigned(uint32_t, fp->fa_nlink); 278 nap->na_uid = fxdr_unsigned(uid_t, fp->fa_uid); 279 nap->na_gid = fxdr_unsigned(gid_t, fp->fa_gid); 280 nap->na_size = fxdr_hyper(&fp->fa3_size); 281 nap->na_blocksize = NFS_FABLKSIZE; 282 nap->na_bytes = fxdr_hyper(&fp->fa3_used); 283 nap->na_fileid = fxdr_hyper(&fp->fa3_fileid); 284 fxdr_nfsv3time(&fp->fa3_atime, &nap->na_atime); 285 fxdr_nfsv3time(&fp->fa3_ctime, &nap->na_ctime); 286 fxdr_nfsv3time(&fp->fa3_mtime, &nap->na_mtime); 287 nap->na_flags = 0; 288 nap->na_filerev = 0; 289 } else { 290 NFSM_DISSECT(fp, struct nfs_fattr *, NFSX_V2FATTR); 291 nap->na_type = nfsv2tov_type(fp->fa_type); 292 nap->na_mode = fxdr_unsigned(u_short, fp->fa_mode); 293 if (nap->na_type == VNON || nap->na_type == VREG) 294 nap->na_type = IFTOVT(nap->na_mode); 295 nap->na_rdev = fxdr_unsigned(dev_t, fp->fa2_rdev); 296 297 /* 298 * Really ugly NFSv2 kludge. 299 */ 300 if (nap->na_type == VCHR && nap->na_rdev == ((dev_t)-1)) 301 nap->na_type = VFIFO; 302 nap->na_nlink = fxdr_unsigned(u_short, fp->fa_nlink); 303 nap->na_uid = fxdr_unsigned(uid_t, fp->fa_uid); 304 nap->na_gid = fxdr_unsigned(gid_t, fp->fa_gid); 305 nap->na_size = fxdr_unsigned(u_int32_t, fp->fa2_size); 306 nap->na_blocksize = fxdr_unsigned(int32_t, fp->fa2_blocksize); 307 nap->na_bytes = 308 (u_quad_t)fxdr_unsigned(int32_t, fp->fa2_blocks) * 309 NFS_FABLKSIZE; 310 nap->na_fileid = fxdr_unsigned(uint64_t, fp->fa2_fileid); 311 fxdr_nfsv2time(&fp->fa2_atime, &nap->na_atime); 312 fxdr_nfsv2time(&fp->fa2_mtime, &nap->na_mtime); 313 nap->na_flags = 0; 314 nap->na_ctime.tv_sec = fxdr_unsigned(u_int32_t, 315 fp->fa2_ctime.nfsv2_sec); 316 nap->na_ctime.tv_nsec = 0; 317 nap->na_gen = fxdr_unsigned(u_int32_t,fp->fa2_ctime.nfsv2_usec); 318 nap->na_filerev = 0; 319 } 320 nfsmout: 321 return (error); 322 } 323 324 /* 325 * This function finds the directory cookie that corresponds to the 326 * logical byte offset given. 327 */ 328 nfsuint64 * 329 nfscl_getcookie(struct nfsnode *np, off_t off, int add) 330 { 331 struct nfsdmap *dp, *dp2; 332 int pos; 333 334 pos = off / NFS_DIRBLKSIZ; 335 if (pos == 0) { 336 KASSERT(!add, ("nfs getcookie add at 0")); 337 return (&nfs_nullcookie); 338 } 339 pos--; 340 dp = LIST_FIRST(&np->n_cookies); 341 if (!dp) { 342 if (add) { 343 dp = malloc(sizeof (struct nfsdmap), 344 M_NFSDIROFF, M_WAITOK); 345 dp->ndm_eocookie = 0; 346 LIST_INSERT_HEAD(&np->n_cookies, dp, ndm_list); 347 } else 348 return (NULL); 349 } 350 while (pos >= NFSNUMCOOKIES) { 351 pos -= NFSNUMCOOKIES; 352 if (LIST_NEXT(dp, ndm_list) != NULL) { 353 if (!add && dp->ndm_eocookie < NFSNUMCOOKIES && 354 pos >= dp->ndm_eocookie) 355 return (NULL); 356 dp = LIST_NEXT(dp, ndm_list); 357 } else if (add) { 358 dp2 = malloc(sizeof (struct nfsdmap), 359 M_NFSDIROFF, M_WAITOK); 360 dp2->ndm_eocookie = 0; 361 LIST_INSERT_AFTER(dp, dp2, ndm_list); 362 dp = dp2; 363 } else 364 return (NULL); 365 } 366 if (pos >= dp->ndm_eocookie) { 367 if (add) 368 dp->ndm_eocookie = pos + 1; 369 else 370 return (NULL); 371 } 372 return (&dp->ndm_cookies[pos]); 373 } 374 375 /* 376 * Gets a file handle out of an nfs reply sent to the client and returns 377 * the file handle and the file's attributes. 378 * For V4, it assumes that Getfh and Getattr Op's results are here. 379 */ 380 int 381 nfscl_mtofh(struct nfsrv_descript *nd, struct nfsfh **nfhpp, 382 struct nfsvattr *nap, int *attrflagp) 383 { 384 u_int32_t *tl; 385 int error = 0, flag = 1; 386 387 *nfhpp = NULL; 388 *attrflagp = 0; 389 /* 390 * First get the file handle and vnode. 391 */ 392 if (nd->nd_flag & ND_NFSV3) { 393 NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED); 394 flag = fxdr_unsigned(int, *tl); 395 } else if (nd->nd_flag & ND_NFSV4) { 396 NFSM_DISSECT(tl, u_int32_t *, 2 * NFSX_UNSIGNED); 397 /* If the GetFH failed, clear flag. */ 398 if (*++tl != 0) { 399 nd->nd_flag |= ND_NOMOREDATA; 400 flag = 0; 401 error = ENXIO; /* Return ENXIO so *nfhpp isn't used. */ 402 } 403 } 404 if (flag) { 405 error = nfsm_getfh(nd, nfhpp); 406 if (error) 407 return (error); 408 } 409 410 /* 411 * Now, get the attributes. 412 */ 413 if (flag != 0 && (nd->nd_flag & ND_NFSV4) != 0) { 414 NFSM_DISSECT(tl, u_int32_t *, 2 * NFSX_UNSIGNED); 415 if (*++tl != 0) { 416 nd->nd_flag |= ND_NOMOREDATA; 417 flag = 0; 418 } 419 } else if (nd->nd_flag & ND_NFSV3) { 420 NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED); 421 if (flag) { 422 flag = fxdr_unsigned(int, *tl); 423 } else if (fxdr_unsigned(int, *tl)) { 424 error = nfsm_advance(nd, NFSX_V3FATTR, -1); 425 if (error) 426 return (error); 427 } 428 } 429 if (flag) { 430 error = nfsm_loadattr(nd, nap); 431 if (!error) 432 *attrflagp = 1; 433 } 434 nfsmout: 435 return (error); 436 } 437 438 /* 439 * Initialize the owner/delegation sleep lock. 440 */ 441 void 442 nfscl_lockinit(struct nfsv4lock *lckp) 443 { 444 445 lckp->nfslock_usecnt = 0; 446 lckp->nfslock_lock = 0; 447 } 448 449 /* 450 * Get an exclusive lock. (Not needed for OpenBSD4, since there is only one 451 * thread for each posix process in the kernel.) 452 */ 453 void 454 nfscl_lockexcl(struct nfsv4lock *lckp, void *mutex) 455 { 456 int igotlock; 457 458 do { 459 igotlock = nfsv4_lock(lckp, 1, NULL, mutex, NULL); 460 } while (!igotlock); 461 } 462 463 /* 464 * Release an exclusive lock. 465 */ 466 void 467 nfscl_lockunlock(struct nfsv4lock *lckp) 468 { 469 470 nfsv4_unlock(lckp, 0); 471 } 472 473 /* 474 * Called to derefernce a lock on a stateid (delegation or open owner). 475 */ 476 void 477 nfscl_lockderef(struct nfsv4lock *lckp) 478 { 479 480 NFSLOCKCLSTATE(); 481 lckp->nfslock_usecnt--; 482 if (lckp->nfslock_usecnt == 0 && (lckp->nfslock_lock & NFSV4LOCK_WANTED)) { 483 lckp->nfslock_lock &= ~NFSV4LOCK_WANTED; 484 wakeup((caddr_t)lckp); 485 } 486 NFSUNLOCKCLSTATE(); 487 }
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