linux_file64.c revision 1.36
1 /* $NetBSD: linux_file64.c,v 1.36 2007/03/04 06:01:23 christos Exp $ */ 2 3 /*- 4 * Copyright (c) 1995, 1998, 2000 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Frank van der Linden and Eric Haszlakiewicz. 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. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the NetBSD 21 * Foundation, Inc. and its contributors. 22 * 4. Neither the name of The NetBSD Foundation nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 */ 38 39 /* 40 * Linux 64bit filesystem calls. Used on 32bit archs, not used on 64bit ones. 41 */ 42 43 #include <sys/cdefs.h> 44 __KERNEL_RCSID(0, "$NetBSD: linux_file64.c,v 1.36 2007/03/04 06:01:23 christos Exp $"); 45 46 #include <sys/param.h> 47 #include <sys/systm.h> 48 #include <sys/namei.h> 49 #include <sys/proc.h> 50 #include <sys/dirent.h> 51 #include <sys/file.h> 52 #include <sys/stat.h> 53 #include <sys/filedesc.h> 54 #include <sys/ioctl.h> 55 #include <sys/kernel.h> 56 #include <sys/mount.h> 57 #include <sys/malloc.h> 58 #include <sys/vnode.h> 59 #include <sys/tty.h> 60 #include <sys/conf.h> 61 62 #include <sys/syscallargs.h> 63 64 #include <compat/linux/common/linux_types.h> 65 #include <compat/linux/common/linux_signal.h> 66 #include <compat/linux/common/linux_fcntl.h> 67 #include <compat/linux/common/linux_util.h> 68 #include <compat/linux/common/linux_machdep.h> 69 #include <compat/linux/common/linux_dirent.h> 70 71 #include <compat/linux/linux_syscallargs.h> 72 73 #ifndef alpha 74 75 # ifndef COMPAT_LINUX32 76 77 static void bsd_to_linux_stat __P((struct stat *, struct linux_stat64 *)); 78 static int linux_do_stat64 __P((struct lwp *, void *, register_t *, int)); 79 80 /* 81 * Convert a NetBSD stat structure to a Linux stat structure. 82 * Only the order of the fields and the padding in the structure 83 * is different. linux_fakedev is a machine-dependent function 84 * which optionally converts device driver major/minor numbers 85 * (XXX horrible, but what can you do against code that compares 86 * things against constant major device numbers? sigh) 87 */ 88 static void 89 bsd_to_linux_stat(bsp, lsp) 90 struct stat *bsp; 91 struct linux_stat64 *lsp; 92 { 93 lsp->lst_dev = linux_fakedev(bsp->st_dev, 0); 94 lsp->lst_ino = bsp->st_ino; 95 lsp->lst_mode = (linux_mode_t)bsp->st_mode; 96 if (bsp->st_nlink >= (1 << 15)) 97 lsp->lst_nlink = (1 << 15) - 1; 98 else 99 lsp->lst_nlink = (linux_nlink_t)bsp->st_nlink; 100 lsp->lst_uid = bsp->st_uid; 101 lsp->lst_gid = bsp->st_gid; 102 lsp->lst_rdev = linux_fakedev(bsp->st_rdev, 1); 103 lsp->lst_size = bsp->st_size; 104 lsp->lst_blksize = bsp->st_blksize; 105 lsp->lst_blocks = bsp->st_blocks; 106 lsp->lst_atime = bsp->st_atime; 107 lsp->lst_mtime = bsp->st_mtime; 108 lsp->lst_ctime = bsp->st_ctime; 109 # ifdef LINUX_STAT64_HAS_NSEC 110 lsp->lst_atime_nsec = bsp->st_atimensec; 111 lsp->lst_mtime_nsec = bsp->st_mtimensec; 112 lsp->lst_ctime_nsec = bsp->st_ctimensec; 113 # endif 114 # if LINUX_STAT64_HAS_BROKEN_ST_INO 115 lsp->__lst_ino = (linux_ino_t) bsp->st_ino; 116 # endif 117 } 118 119 /* 120 * The stat functions below are plain sailing. stat and lstat are handled 121 * by one function to avoid code duplication. 122 */ 123 int 124 linux_sys_fstat64(l, v, retval) 125 struct lwp *l; 126 void *v; 127 register_t *retval; 128 { 129 struct linux_sys_fstat64_args /* { 130 syscallarg(int) fd; 131 syscallarg(struct linux_stat64 *) sp; 132 } */ *uap = v; 133 struct proc *p = l->l_proc; 134 struct sys___fstat30_args fsa; 135 struct linux_stat64 tmplst; 136 struct stat *st,tmpst; 137 void *sg; 138 int error; 139 140 sg = stackgap_init(p, 0); 141 142 st = stackgap_alloc(p, &sg, sizeof (struct stat)); 143 144 SCARG(&fsa, fd) = SCARG(uap, fd); 145 SCARG(&fsa, sb) = st; 146 147 if ((error = sys___fstat30(l, &fsa, retval))) 148 return error; 149 150 if ((error = copyin(st, &tmpst, sizeof tmpst))) 151 return error; 152 153 bsd_to_linux_stat(&tmpst, &tmplst); 154 155 if ((error = copyout(&tmplst, SCARG(uap, sp), sizeof tmplst))) 156 return error; 157 158 return 0; 159 } 160 161 static int 162 linux_do_stat64(l, v, retval, dolstat) 163 struct lwp *l; 164 void *v; 165 register_t *retval; 166 int dolstat; 167 { 168 struct proc *p = l->l_proc; 169 struct sys___stat30_args sa; 170 struct linux_stat64 tmplst; 171 struct stat *st, tmpst; 172 void *sg; 173 int error; 174 struct linux_sys_stat64_args *uap = v; 175 176 sg = stackgap_init(p, 0); 177 st = stackgap_alloc(p, &sg, sizeof (struct stat)); 178 CHECK_ALT_EXIST(l, &sg, SCARG(uap, path)); 179 180 SCARG(&sa, ub) = st; 181 SCARG(&sa, path) = SCARG(uap, path); 182 183 if ((error = (dolstat ? sys___lstat30(l, &sa, retval) : 184 sys___stat30(l, &sa, retval)))) 185 return error; 186 187 if ((error = copyin(st, &tmpst, sizeof tmpst))) 188 return error; 189 190 bsd_to_linux_stat(&tmpst, &tmplst); 191 192 if ((error = copyout(&tmplst, SCARG(uap, sp), sizeof tmplst))) 193 return error; 194 195 return 0; 196 } 197 198 int 199 linux_sys_stat64(l, v, retval) 200 struct lwp *l; 201 void *v; 202 register_t *retval; 203 { 204 struct linux_sys_stat64_args /* { 205 syscallarg(const char *) path; 206 syscallarg(struct linux_stat64 *) sp; 207 } */ *uap = v; 208 209 return linux_do_stat64(l, uap, retval, 0); 210 } 211 212 int 213 linux_sys_lstat64(l, v, retval) 214 struct lwp *l; 215 void *v; 216 register_t *retval; 217 { 218 struct linux_sys_lstat64_args /* { 219 syscallarg(const char *) path; 220 syscallarg(struct linux_stat64 *) sp; 221 } */ *uap = v; 222 223 return linux_do_stat64(l, uap, retval, 1); 224 } 225 226 int 227 linux_sys_truncate64(l, v, retval) 228 struct lwp *l; 229 void *v; 230 register_t *retval; 231 { 232 struct linux_sys_truncate64_args /* { 233 syscallarg(const char *) path; 234 syscallarg(off_t) length; 235 } */ *uap = v; 236 struct sys_truncate_args ta; 237 struct proc *p = l->l_proc; 238 void *sg = stackgap_init(p, 0); 239 240 CHECK_ALT_EXIST(l, &sg, SCARG(uap, path)); 241 242 /* Linux doesn't have the 'pad' pseudo-parameter */ 243 SCARG(&ta, path) = SCARG(uap, path); 244 SCARG(&ta, pad) = 0; 245 SCARG(&ta, length) = SCARG(uap, length); 246 247 return sys_truncate(l, &ta, retval); 248 } 249 250 int 251 linux_sys_ftruncate64(l, v, retval) 252 struct lwp *l; 253 void *v; 254 register_t *retval; 255 { 256 struct linux_sys_ftruncate64_args /* { 257 syscallarg(unsigned int) fd; 258 syscallarg(off_t) length; 259 } */ *uap = v; 260 struct sys_ftruncate_args ta; 261 262 /* Linux doesn't have the 'pad' pseudo-parameter */ 263 SCARG(&ta, fd) = SCARG(uap, fd); 264 SCARG(&ta, pad) = 0; 265 SCARG(&ta, length) = SCARG(uap, length); 266 267 return sys_ftruncate(l, &ta, retval); 268 } 269 # endif /* !COMPAT_LINUX32 */ 270 271 # if !defined(__m68k__) && (!defined(__amd64__) || defined(COMPAT_LINUX32)) 272 static void bsd_to_linux_flock64 __P((struct linux_flock64 *, 273 const struct flock *)); 274 static void linux_to_bsd_flock64 __P((struct flock *, 275 const struct linux_flock64 *)); 276 277 static void 278 bsd_to_linux_flock64(lfp, bfp) 279 struct linux_flock64 *lfp; 280 const struct flock *bfp; 281 { 282 283 lfp->l_start = bfp->l_start; 284 lfp->l_len = bfp->l_len; 285 lfp->l_pid = bfp->l_pid; 286 lfp->l_whence = bfp->l_whence; 287 switch (bfp->l_type) { 288 case F_RDLCK: 289 lfp->l_type = LINUX_F_RDLCK; 290 break; 291 case F_UNLCK: 292 lfp->l_type = LINUX_F_UNLCK; 293 break; 294 case F_WRLCK: 295 lfp->l_type = LINUX_F_WRLCK; 296 break; 297 } 298 } 299 300 static void 301 linux_to_bsd_flock64(bfp, lfp) 302 struct flock *bfp; 303 const struct linux_flock64 *lfp; 304 { 305 306 bfp->l_start = lfp->l_start; 307 bfp->l_len = lfp->l_len; 308 bfp->l_pid = lfp->l_pid; 309 bfp->l_whence = lfp->l_whence; 310 switch (lfp->l_type) { 311 case LINUX_F_RDLCK: 312 bfp->l_type = F_RDLCK; 313 break; 314 case LINUX_F_UNLCK: 315 bfp->l_type = F_UNLCK; 316 break; 317 case LINUX_F_WRLCK: 318 bfp->l_type = F_WRLCK; 319 break; 320 } 321 } 322 323 int 324 linux_sys_fcntl64(l, v, retval) 325 struct lwp *l; 326 void *v; 327 register_t *retval; 328 { 329 struct linux_sys_fcntl64_args /* { 330 syscallarg(int) fd; 331 syscallarg(int) cmd; 332 syscallarg(void *) arg; 333 } */ *uap = v; 334 struct proc *p = l->l_proc; 335 struct sys_fcntl_args fca; 336 struct linux_flock64 lfl; 337 struct flock bfl, *bfp; 338 int error; 339 void *sg; 340 void *arg = SCARG(uap, arg); 341 int cmd = SCARG(uap, cmd); 342 int fd = SCARG(uap, fd); 343 344 switch (cmd) { 345 case LINUX_F_GETLK64: 346 sg = stackgap_init(p, 0); 347 bfp = (struct flock *) stackgap_alloc(p, &sg, sizeof *bfp); 348 if ((error = copyin(arg, &lfl, sizeof lfl)) != 0) 349 return error; 350 linux_to_bsd_flock64(&bfl, &lfl); 351 if ((error = copyout(&bfl, bfp, sizeof bfl)) != 0) 352 return error; 353 SCARG(&fca, fd) = fd; 354 SCARG(&fca, cmd) = F_GETLK; 355 SCARG(&fca, arg) = bfp; 356 if ((error = sys_fcntl(l, &fca, retval)) != 0) 357 return error; 358 if ((error = copyin(bfp, &bfl, sizeof bfl)) != 0) 359 return error; 360 bsd_to_linux_flock64(&lfl, &bfl); 361 return copyout(&lfl, arg, sizeof lfl); 362 case LINUX_F_SETLK64: 363 case LINUX_F_SETLKW64: 364 cmd = (cmd == LINUX_F_SETLK64 ? F_SETLK : F_SETLKW); 365 if ((error = copyin(arg, &lfl, sizeof lfl)) != 0) 366 return error; 367 linux_to_bsd_flock64(&bfl, &lfl); 368 sg = stackgap_init(p, 0); 369 bfp = (struct flock *) stackgap_alloc(p, &sg, sizeof *bfp); 370 if ((error = copyout(&bfl, bfp, sizeof bfl)) != 0) 371 return error; 372 SCARG(&fca, fd) = fd; 373 SCARG(&fca, cmd) = cmd; 374 SCARG(&fca, arg) = bfp; 375 return sys_fcntl(l, &fca, retval); 376 default: 377 return linux_sys_fcntl(l, v, retval); 378 } 379 } 380 # endif /* !m69k && !amd64 && !COMPAT_LINUX32 */ 381 382 #endif /* !alpha */ 383 384 /* 385 * Linux 'readdir' call. This code is mostly taken from the 386 * SunOS getdents call (see compat/sunos/sunos_misc.c), though 387 * an attempt has been made to keep it a little cleaner. 388 * 389 * The d_off field contains the offset of the next valid entry, 390 * unless the older Linux getdents(2), which used to have it set 391 * to the offset of the entry itself. This function also doesn't 392 * need to deal with the old count == 1 glibc problem. 393 * 394 * Read in BSD-style entries, convert them, and copy them out. 395 * 396 * Note that this doesn't handle union-mounted filesystems. 397 */ 398 #ifndef COMPAT_LINUX32 399 int 400 linux_sys_getdents64(l, v, retval) 401 struct lwp *l; 402 void *v; 403 register_t *retval; 404 { 405 struct linux_sys_getdents_args /* { 406 syscallarg(int) fd; 407 syscallarg(struct linux_dirent64 *) dent; 408 syscallarg(unsigned int) count; 409 } */ *uap = v; 410 struct dirent *bdp; 411 struct vnode *vp; 412 char *inp, *tbuf; /* BSD-format */ 413 int len, reclen; /* BSD-format */ 414 char *outp; /* Linux-format */ 415 int resid, linux_reclen = 0; /* Linux-format */ 416 struct file *fp; 417 struct uio auio; 418 struct iovec aiov; 419 struct linux_dirent64 idb; 420 off_t off; /* true file offset */ 421 int buflen, error, eofflag, nbytes; 422 struct vattr va; 423 off_t *cookiebuf = NULL, *cookie; 424 int ncookies; 425 426 /* getvnode() will use the descriptor for us */ 427 if ((error = getvnode(l->l_proc->p_fd, SCARG(uap, fd), &fp)) != 0) 428 return (error); 429 430 if ((fp->f_flag & FREAD) == 0) { 431 error = EBADF; 432 goto out1; 433 } 434 435 vp = (struct vnode *)fp->f_data; 436 if (vp->v_type != VDIR) { 437 error = EINVAL; 438 goto out1; 439 } 440 441 if ((error = VOP_GETATTR(vp, &va, l->l_cred, l))) 442 goto out1; 443 444 nbytes = SCARG(uap, count); 445 buflen = min(MAXBSIZE, nbytes); 446 if (buflen < va.va_blocksize) 447 buflen = va.va_blocksize; 448 tbuf = malloc(buflen, M_TEMP, M_WAITOK); 449 450 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 451 off = fp->f_offset; 452 again: 453 aiov.iov_base = tbuf; 454 aiov.iov_len = buflen; 455 auio.uio_iov = &aiov; 456 auio.uio_iovcnt = 1; 457 auio.uio_rw = UIO_READ; 458 auio.uio_resid = buflen; 459 auio.uio_offset = off; 460 UIO_SETUP_SYSSPACE(&auio); 461 /* 462 * First we read into the malloc'ed buffer, then 463 * we massage it into user space, one record at a time. 464 */ 465 error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag, &cookiebuf, 466 &ncookies); 467 if (error) 468 goto out; 469 470 inp = tbuf; 471 outp = (void *)SCARG(uap, dent); 472 resid = nbytes; 473 if ((len = buflen - auio.uio_resid) == 0) 474 goto eof; 475 476 for (cookie = cookiebuf; len > 0; len -= reclen) { 477 bdp = (struct dirent *)inp; 478 reclen = bdp->d_reclen; 479 if (reclen & 3) 480 panic("linux_readdir"); 481 if (bdp->d_fileno == 0) { 482 inp += reclen; /* it is a hole; squish it out */ 483 if (cookie) 484 off = *cookie++; 485 else 486 off += reclen; 487 continue; 488 } 489 linux_reclen = LINUX_RECLEN(&idb, bdp->d_namlen); 490 if (reclen > len || resid < linux_reclen) { 491 /* entry too big for buffer, so just stop */ 492 outp++; 493 break; 494 } 495 if (cookie) 496 off = *cookie++; /* each entry points to next */ 497 else 498 off += reclen; 499 /* 500 * Massage in place to make a Linux-shaped dirent (otherwise 501 * we have to worry about touching user memory outside of 502 * the copyout() call). 503 */ 504 idb.d_ino = bdp->d_fileno; 505 idb.d_type = bdp->d_type; 506 idb.d_off = off; 507 idb.d_reclen = (u_short)linux_reclen; 508 strcpy(idb.d_name, bdp->d_name); 509 if ((error = copyout((void *)&idb, outp, linux_reclen))) 510 goto out; 511 /* advance past this real entry */ 512 inp += reclen; 513 /* advance output past Linux-shaped entry */ 514 outp += linux_reclen; 515 resid -= linux_reclen; 516 } 517 518 /* if we squished out the whole block, try again */ 519 if (outp == (void *)SCARG(uap, dent)) 520 goto again; 521 fp->f_offset = off; /* update the vnode offset */ 522 523 eof: 524 *retval = nbytes - resid; 525 out: 526 VOP_UNLOCK(vp, 0); 527 if (cookiebuf) 528 free(cookiebuf, M_TEMP); 529 free(tbuf, M_TEMP); 530 out1: 531 FILE_UNUSE(fp, l); 532 return error; 533 } 534 #endif /* !COMPAT_LINUX32 */ 535
Indexes created Thu Sep 25 02:09:54 GMT 2025