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 /* 53 * copies a uio scatter/gather list to an mbuf chain. 54 * NOTE: can only handle iovcnt == 1 55 */ 56 void 57 nfsm_uiombuf(struct nfsrv_descript *nd, struct uio *uiop, int siz) 58 { 59 char *uiocp; 60 struct mbuf *mp, *mp2; 61 int xfer, left, mlen; 62 int uiosiz, clflg, rem; 63 char *mcp, *tcp; 64 65 KASSERT(uiop->uio_iovcnt == 1, ("nfsm_uiotombuf: iovcnt != 1")); 66 67 if (siz > ncl_mbuf_mlen) /* or should it >= MCLBYTES ?? */ 68 clflg = 1; 69 else 70 clflg = 0; 71 rem = NFSM_RNDUP(siz) - siz; 72 mp = mp2 = nd->nd_mb; 73 mcp = nd->nd_bpos; 74 while (siz > 0) { 75 KASSERT((nd->nd_flag & ND_EXTPG) != 0 || mcp == 76 mtod(mp, char *) + mp->m_len, ("nfsm_uiombuf: mcp wrong")); 77 left = uiop->uio_iov->iov_len; 78 uiocp = uiop->uio_iov->iov_base; 79 if (left > siz) 80 left = siz; 81 uiosiz = left; 82 while (left > 0) { 83 if ((nd->nd_flag & ND_EXTPG) != 0) 84 mlen = nd->nd_bextpgsiz; 85 else 86 mlen = M_TRAILINGSPACE(mp); 87 if (mlen == 0) { 88 if ((nd->nd_flag & ND_EXTPG) != 0) { 89 mp = nfsm_add_ext_pgs(mp, 90 nd->nd_maxextsiz, &nd->nd_bextpg); 91 mcp = (char *)(void *)PHYS_TO_DMAP( 92 mp->m_epg_pa[nd->nd_bextpg]); 93 nd->nd_bextpgsiz = mlen = PAGE_SIZE; 94 } else { 95 if (clflg) 96 NFSMCLGET(mp, M_WAITOK); 97 else 98 NFSMGET(mp); 99 mp->m_len = 0; 100 mlen = M_TRAILINGSPACE(mp); 101 mcp = mtod(mp, char *); 102 mp2->m_next = mp; 103 mp2 = mp; 104 } 105 } 106 xfer = (left > mlen) ? mlen : left; 107 if (uiop->uio_segflg == UIO_SYSSPACE) 108 NFSBCOPY(uiocp, mcp, xfer); 109 else 110 copyin(uiocp, mcp, xfer); 111 mp->m_len += xfer; 112 left -= xfer; 113 uiocp += xfer; 114 mcp += xfer; 115 if ((nd->nd_flag & ND_EXTPG) != 0) { 116 nd->nd_bextpgsiz -= xfer; 117 mp->m_epg_last_len += xfer; 118 } 119 uiop->uio_offset += xfer; 120 uiop->uio_resid -= xfer; 121 } 122 tcp = (char *)uiop->uio_iov->iov_base; 123 tcp += uiosiz; 124 uiop->uio_iov->iov_base = (void *)tcp; 125 uiop->uio_iov->iov_len -= uiosiz; 126 siz -= uiosiz; 127 } 128 if (rem > 0) { 129 if ((nd->nd_flag & ND_EXTPG) == 0 && rem > 130 M_TRAILINGSPACE(mp)) { 131 NFSMGET(mp); 132 mp->m_len = 0; 133 mp2->m_next = mp; 134 mcp = mtod(mp, char *); 135 } else if ((nd->nd_flag & ND_EXTPG) != 0 && rem > 136 nd->nd_bextpgsiz) { 137 mp = nfsm_add_ext_pgs(mp, nd->nd_maxextsiz, 138 &nd->nd_bextpg); 139 mcp = (char *)(void *) 140 PHYS_TO_DMAP(mp->m_epg_pa[nd->nd_bextpg]); 141 nd->nd_bextpgsiz = PAGE_SIZE; 142 } 143 for (left = 0; left < rem; left++) 144 *mcp++ = '\0'; 145 mp->m_len += rem; 146 if ((nd->nd_flag & ND_EXTPG) != 0) { 147 nd->nd_bextpgsiz -= rem; 148 mp->m_epg_last_len += rem; 149 } 150 } 151 nd->nd_bpos = mcp; 152 nd->nd_mb = mp; 153 } 154 155 /* 156 * copies a uio scatter/gather list to an mbuf chain. 157 * This version returns the mbuf list and does not use "nd". 158 * NOTE: can only handle iovcnt == 1 159 */ 160 struct mbuf * 161 nfsm_uiombuflist(struct uio *uiop, int siz, u_int maxext) 162 { 163 char *uiocp; 164 struct mbuf *mp, *mp2, *firstmp; 165 int extpg, extpgsiz = 0, i, left, mlen, rem, xfer; 166 int uiosiz, clflg; 167 char *mcp, *tcp; 168 169 KASSERT(uiop->uio_iovcnt == 1, ("nfsm_uiotombuf: iovcnt != 1")); 170 171 if (maxext > 0) { 172 mp = mb_alloc_ext_plus_pages(PAGE_SIZE, M_WAITOK); 173 mcp = (char *)(void *)PHYS_TO_DMAP(mp->m_epg_pa[0]); 174 extpg = 0; 175 extpgsiz = PAGE_SIZE; 176 } else { 177 if (siz > ncl_mbuf_mlen) /* or should it >= MCLBYTES ?? */ 178 clflg = 1; 179 else 180 clflg = 0; 181 if (clflg != 0) 182 NFSMCLGET(mp, M_WAITOK); 183 else 184 NFSMGET(mp); 185 mcp = mtod(mp, char *); 186 } 187 mp->m_len = 0; 188 firstmp = mp2 = mp; 189 rem = NFSM_RNDUP(siz) - siz; 190 while (siz > 0) { 191 left = uiop->uio_iov->iov_len; 192 uiocp = uiop->uio_iov->iov_base; 193 if (left > siz) 194 left = siz; 195 uiosiz = left; 196 while (left > 0) { 197 if (maxext > 0) 198 mlen = extpgsiz; 199 else 200 mlen = M_TRAILINGSPACE(mp); 201 if (mlen == 0) { 202 if (maxext > 0) { 203 mp = nfsm_add_ext_pgs(mp, maxext, 204 &extpg); 205 mlen = extpgsiz = PAGE_SIZE; 206 mcp = (char *)(void *)PHYS_TO_DMAP( 207 mp->m_epg_pa[extpg]); 208 } else { 209 if (clflg) 210 NFSMCLGET(mp, M_WAITOK); 211 else 212 NFSMGET(mp); 213 mcp = mtod(mp, char *); 214 mlen = M_TRAILINGSPACE(mp); 215 mp->m_len = 0; 216 mp2->m_next = mp; 217 mp2 = mp; 218 } 219 } 220 xfer = (left > mlen) ? mlen : left; 221 if (uiop->uio_segflg == UIO_SYSSPACE) 222 NFSBCOPY(uiocp, mcp, xfer); 223 else 224 copyin(uiocp, mcp, xfer); 225 mp->m_len += xfer; 226 mcp += xfer; 227 if (maxext > 0) { 228 extpgsiz -= xfer; 229 mp->m_epg_last_len += xfer; 230 } 231 left -= xfer; 232 uiocp += xfer; 233 uiop->uio_offset += xfer; 234 uiop->uio_resid -= xfer; 235 } 236 tcp = (char *)uiop->uio_iov->iov_base; 237 tcp += uiosiz; 238 uiop->uio_iov->iov_base = (void *)tcp; 239 uiop->uio_iov->iov_len -= uiosiz; 240 siz -= uiosiz; 241 } 242 if (rem > 0) { 243 KASSERT((mp->m_flags & M_EXTPG) != 0 || 244 rem <= M_TRAILINGSPACE(mp), 245 ("nfsm_uiombuflist: no space for padding")); 246 for (i = 0; i < rem; i++) 247 *mcp++ = '\0'; 248 mp->m_len += rem; 249 if (maxext > 0) 250 mp->m_epg_last_len += rem; 251 } 252 return (firstmp); 253 } 254 255 /* 256 * Load vnode attributes from the xdr file attributes. 257 * Returns EBADRPC if they can't be parsed, 0 otherwise. 258 */ 259 int 260 nfsm_loadattr(struct nfsrv_descript *nd, struct nfsvattr *nap) 261 { 262 struct nfs_fattr *fp; 263 int error = 0; 264 265 if (nd->nd_flag & ND_NFSV4) { 266 error = nfsv4_loadattr(nd, NULL, nap, NULL, NULL, 0, NULL, 267 NULL, NULL, NULL, NULL, 0, NULL, NULL, NULL, NULL, NULL); 268 } else if (nd->nd_flag & ND_NFSV3) { 269 NFSM_DISSECT(fp, struct nfs_fattr *, NFSX_V3FATTR); 270 nap->na_type = nfsv34tov_type(fp->fa_type); 271 nap->na_mode = fxdr_unsigned(u_short, fp->fa_mode); 272 nap->na_rdev = NFSMAKEDEV( 273 fxdr_unsigned(int, fp->fa3_rdev.specdata1), 274 fxdr_unsigned(int, fp->fa3_rdev.specdata2)); 275 nap->na_nlink = fxdr_unsigned(uint32_t, fp->fa_nlink); 276 nap->na_uid = fxdr_unsigned(uid_t, fp->fa_uid); 277 nap->na_gid = fxdr_unsigned(gid_t, fp->fa_gid); 278 nap->na_size = fxdr_hyper(&fp->fa3_size); 279 nap->na_blocksize = NFS_FABLKSIZE; 280 nap->na_bytes = fxdr_hyper(&fp->fa3_used); 281 nap->na_fileid = fxdr_hyper(&fp->fa3_fileid); 282 fxdr_nfsv3time(&fp->fa3_atime, &nap->na_atime); 283 fxdr_nfsv3time(&fp->fa3_ctime, &nap->na_ctime); 284 fxdr_nfsv3time(&fp->fa3_mtime, &nap->na_mtime); 285 nap->na_btime.tv_sec = -1; 286 nap->na_btime.tv_nsec = 0; 287 nap->na_flags = 0; 288 nap->na_gen = 0; 289 nap->na_filerev = 0; 290 } else { 291 NFSM_DISSECT(fp, struct nfs_fattr *, NFSX_V2FATTR); 292 nap->na_type = nfsv2tov_type(fp->fa_type); 293 nap->na_mode = fxdr_unsigned(u_short, fp->fa_mode); 294 if (nap->na_type == VNON || nap->na_type == VREG) 295 nap->na_type = IFTOVT(nap->na_mode); 296 nap->na_rdev = fxdr_unsigned(dev_t, fp->fa2_rdev); 297 298 /* 299 * Really ugly NFSv2 kludge. 300 */ 301 if (nap->na_type == VCHR && nap->na_rdev == ((dev_t)-1)) 302 nap->na_type = VFIFO; 303 nap->na_nlink = fxdr_unsigned(u_short, fp->fa_nlink); 304 nap->na_uid = fxdr_unsigned(uid_t, fp->fa_uid); 305 nap->na_gid = fxdr_unsigned(gid_t, fp->fa_gid); 306 nap->na_size = fxdr_unsigned(u_int32_t, fp->fa2_size); 307 nap->na_blocksize = fxdr_unsigned(int32_t, fp->fa2_blocksize); 308 nap->na_bytes = 309 (u_quad_t)fxdr_unsigned(int32_t, fp->fa2_blocks) * 310 NFS_FABLKSIZE; 311 nap->na_fileid = fxdr_unsigned(uint64_t, fp->fa2_fileid); 312 fxdr_nfsv2time(&fp->fa2_atime, &nap->na_atime); 313 fxdr_nfsv2time(&fp->fa2_mtime, &nap->na_mtime); 314 nap->na_flags = 0; 315 nap->na_ctime.tv_sec = fxdr_unsigned(u_int32_t, 316 fp->fa2_ctime.nfsv2_sec); 317 nap->na_ctime.tv_nsec = 0; 318 nap->na_btime.tv_sec = -1; 319 nap->na_btime.tv_nsec = 0; 320 nap->na_gen = fxdr_unsigned(u_int32_t,fp->fa2_ctime.nfsv2_usec); 321 nap->na_filerev = 0; 322 } 323 nfsmout: 324 return (error); 325 } 326 327 /* 328 * Gets a file handle out of an nfs reply sent to the client and returns 329 * the file handle and the file's attributes. 330 * For V4, it assumes that Getfh and Getattr Op's results are here. 331 */ 332 int 333 nfscl_mtofh(struct nfsrv_descript *nd, struct nfsfh **nfhpp, 334 struct nfsvattr *nap, int *attrflagp) 335 { 336 u_int32_t *tl; 337 int error = 0, flag = 1; 338 339 *nfhpp = NULL; 340 *attrflagp = 0; 341 /* 342 * First get the file handle and vnode. 343 */ 344 if (nd->nd_flag & ND_NFSV3) { 345 NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED); 346 flag = fxdr_unsigned(int, *tl); 347 } else if (nd->nd_flag & ND_NFSV4) { 348 NFSM_DISSECT(tl, u_int32_t *, 2 * NFSX_UNSIGNED); 349 /* If the GetFH failed, clear flag. */ 350 if (*++tl != 0) { 351 nd->nd_flag |= ND_NOMOREDATA; 352 flag = 0; 353 error = ENXIO; /* Return ENXIO so *nfhpp isn't used. */ 354 } 355 } 356 if (flag) { 357 error = nfsm_getfh(nd, nfhpp); 358 if (error) 359 return (error); 360 } 361 362 /* 363 * Now, get the attributes. 364 */ 365 if (flag != 0 && (nd->nd_flag & ND_NFSV4) != 0) { 366 NFSM_DISSECT(tl, u_int32_t *, 2 * NFSX_UNSIGNED); 367 if (*++tl != 0) { 368 nd->nd_flag |= ND_NOMOREDATA; 369 flag = 0; 370 } 371 } else if (nd->nd_flag & ND_NFSV3) { 372 NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED); 373 if (flag) { 374 flag = fxdr_unsigned(int, *tl); 375 } else if (fxdr_unsigned(int, *tl)) { 376 error = nfsm_advance(nd, NFSX_V3FATTR, -1); 377 if (error) 378 return (error); 379 } 380 } 381 if (flag) { 382 error = nfsm_loadattr(nd, nap); 383 if (!error) 384 *attrflagp = 1; 385 } 386 nfsmout: 387 return (error); 388 } 389 390 /* 391 * Initialize the owner/delegation sleep lock. 392 */ 393 void 394 nfscl_lockinit(struct nfsv4lock *lckp) 395 { 396 397 lckp->nfslock_usecnt = 0; 398 lckp->nfslock_lock = 0; 399 } 400 401 /* 402 * Get an exclusive lock. (Not needed for OpenBSD4, since there is only one 403 * thread for each posix process in the kernel.) 404 */ 405 void 406 nfscl_lockexcl(struct nfsv4lock *lckp, void *mutex) 407 { 408 int igotlock; 409 410 do { 411 igotlock = nfsv4_lock(lckp, 1, NULL, mutex, NULL); 412 } while (!igotlock); 413 } 414 415 /* 416 * Release an exclusive lock. 417 */ 418 void 419 nfscl_lockunlock(struct nfsv4lock *lckp) 420 { 421 422 nfsv4_unlock(lckp, 0); 423 } 424 425 /* 426 * Called to dereference a lock on a stateid (delegation or open owner). 427 */ 428 void 429 nfscl_lockderef(struct nfsv4lock *lckp) 430 { 431 432 NFSLOCKCLSTATE(); 433 lckp->nfslock_usecnt--; 434 if (lckp->nfslock_usecnt == 0 && (lckp->nfslock_lock & NFSV4LOCK_WANTED)) { 435 lckp->nfslock_lock &= ~NFSV4LOCK_WANTED; 436 wakeup((caddr_t)lckp); 437 } 438 NFSUNLOCKCLSTATE(); 439 }
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