linux_file64.c revision 1.38
1 /* $NetBSD: linux_file64.c,v 1.38 2007/04/22 08:29:57 dsl 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 1.38 2007/04/22 08:29:57 dsl 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/namei.h> 59 #include <sys/vfs_syscalls.h> 60 #include <sys/vnode.h> 61 #include <sys/tty.h> 62 #include <sys/conf.h> 63 64 #include <sys/syscallargs.h> 65 66 #include <compat/linux/common/linux_types.h> 67 #include <compat/linux/common/linux_signal.h> 68 #include <compat/linux/common/linux_fcntl.h> 69 #include <compat/linux/common/linux_util.h> 70 #include <compat/linux/common/linux_machdep.h> 71 #include <compat/linux/common/linux_dirent.h> 72 73 #include <compat/linux/linux_syscallargs.h> 74 75 #ifndef alpha 76 77 # ifndef COMPAT_LINUX32 78 79 static void bsd_to_linux_stat __P((struct stat *, struct linux_stat64 *)); 80 static int linux_do_stat64 __P((struct lwp *, void *, register_t *, int)); 81 82 /* 83 * Convert a NetBSD stat structure to a Linux stat structure. 84 * Only the order of the fields and the padding in the structure 85 * is different. linux_fakedev is a machine-dependent function 86 * which optionally converts device driver major/minor numbers 87 * (XXX horrible, but what can you do against code that compares 88 * things against constant major device numbers? sigh) 89 */ 90 static void 91 bsd_to_linux_stat(bsp, lsp) 92 struct stat *bsp; 93 struct linux_stat64 *lsp; 94 { 95 lsp->lst_dev = linux_fakedev(bsp->st_dev, 0); 96 lsp->lst_ino = bsp->st_ino; 97 lsp->lst_mode = (linux_mode_t)bsp->st_mode; 98 if (bsp->st_nlink >= (1 << 15)) 99 lsp->lst_nlink = (1 << 15) - 1; 100 else 101 lsp->lst_nlink = (linux_nlink_t)bsp->st_nlink; 102 lsp->lst_uid = bsp->st_uid; 103 lsp->lst_gid = bsp->st_gid; 104 lsp->lst_rdev = linux_fakedev(bsp->st_rdev, 1); 105 lsp->lst_size = bsp->st_size; 106 lsp->lst_blksize = bsp->st_blksize; 107 lsp->lst_blocks = bsp->st_blocks; 108 lsp->lst_atime = bsp->st_atime; 109 lsp->lst_mtime = bsp->st_mtime; 110 lsp->lst_ctime = bsp->st_ctime; 111 # ifdef LINUX_STAT64_HAS_NSEC 112 lsp->lst_atime_nsec = bsp->st_atimensec; 113 lsp->lst_mtime_nsec = bsp->st_mtimensec; 114 lsp->lst_ctime_nsec = bsp->st_ctimensec; 115 # endif 116 # if LINUX_STAT64_HAS_BROKEN_ST_INO 117 lsp->__lst_ino = (linux_ino_t) bsp->st_ino; 118 # endif 119 } 120 121 /* 122 * The stat functions below are plain sailing. stat and lstat are handled 123 * by one function to avoid code duplication. 124 */ 125 int 126 linux_sys_fstat64(l, v, retval) 127 struct lwp *l; 128 void *v; 129 register_t *retval; 130 { 131 struct linux_sys_fstat64_args /* { 132 syscallarg(int) fd; 133 syscallarg(struct linux_stat64 *) sp; 134 } */ *uap = v; 135 struct linux_stat64 tmplst; 136 struct stat tmpst; 137 int error; 138 139 error = do_sys_fstat(l, SCARG(uap, fd), &tmpst); 140 if (error != 0) 141 return error; 142 143 bsd_to_linux_stat(&tmpst, &tmplst); 144 145 return copyout(&tmplst, SCARG(uap, sp), sizeof tmplst); 146 } 147 148 static int 149 linux_do_stat64(l, v, retval, flags) 150 struct lwp *l; 151 void *v; 152 register_t *retval; 153 int flags; 154 { 155 struct linux_stat64 tmplst; 156 struct stat tmpst; 157 int error; 158 struct linux_sys_stat64_args *uap = v; 159 160 error = do_sys_stat(l, SCARG(uap, path), flags, &tmpst); 161 if (error != 0) 162 return error; 163 164 bsd_to_linux_stat(&tmpst, &tmplst); 165 166 return copyout(&tmplst, SCARG(uap, sp), sizeof tmplst); 167 } 168 169 int 170 linux_sys_stat64(l, v, retval) 171 struct lwp *l; 172 void *v; 173 register_t *retval; 174 { 175 struct linux_sys_stat64_args /* { 176 syscallarg(const char *) path; 177 syscallarg(struct linux_stat64 *) sp; 178 } */ *uap = v; 179 180 return linux_do_stat64(l, uap, retval, FOLLOW); 181 } 182 183 int 184 linux_sys_lstat64(l, v, retval) 185 struct lwp *l; 186 void *v; 187 register_t *retval; 188 { 189 struct linux_sys_lstat64_args /* { 190 syscallarg(const char *) path; 191 syscallarg(struct linux_stat64 *) sp; 192 } */ *uap = v; 193 194 return linux_do_stat64(l, uap, retval, NOFOLLOW); 195 } 196 197 int 198 linux_sys_truncate64(l, v, retval) 199 struct lwp *l; 200 void *v; 201 register_t *retval; 202 { 203 struct linux_sys_truncate64_args /* { 204 syscallarg(const char *) path; 205 syscallarg(off_t) length; 206 } */ *uap = v; 207 struct sys_truncate_args ta; 208 209 /* Linux doesn't have the 'pad' pseudo-parameter */ 210 SCARG(&ta, path) = SCARG(uap, path); 211 SCARG(&ta, pad) = 0; 212 SCARG(&ta, length) = SCARG(uap, length); 213 214 return sys_truncate(l, &ta, retval); 215 } 216 217 int 218 linux_sys_ftruncate64(l, v, retval) 219 struct lwp *l; 220 void *v; 221 register_t *retval; 222 { 223 struct linux_sys_ftruncate64_args /* { 224 syscallarg(unsigned int) fd; 225 syscallarg(off_t) length; 226 } */ *uap = v; 227 struct sys_ftruncate_args ta; 228 229 /* Linux doesn't have the 'pad' pseudo-parameter */ 230 SCARG(&ta, fd) = SCARG(uap, fd); 231 SCARG(&ta, pad) = 0; 232 SCARG(&ta, length) = SCARG(uap, length); 233 234 return sys_ftruncate(l, &ta, retval); 235 } 236 # endif /* !COMPAT_LINUX32 */ 237 238 # if !defined(__m68k__) && (!defined(__amd64__) || defined(COMPAT_LINUX32)) 239 static void bsd_to_linux_flock64 __P((struct linux_flock64 *, 240 const struct flock *)); 241 static void linux_to_bsd_flock64 __P((struct flock *, 242 const struct linux_flock64 *)); 243 244 static void 245 bsd_to_linux_flock64(lfp, bfp) 246 struct linux_flock64 *lfp; 247 const struct flock *bfp; 248 { 249 250 lfp->l_start = bfp->l_start; 251 lfp->l_len = bfp->l_len; 252 lfp->l_pid = bfp->l_pid; 253 lfp->l_whence = bfp->l_whence; 254 switch (bfp->l_type) { 255 case F_RDLCK: 256 lfp->l_type = LINUX_F_RDLCK; 257 break; 258 case F_UNLCK: 259 lfp->l_type = LINUX_F_UNLCK; 260 break; 261 case F_WRLCK: 262 lfp->l_type = LINUX_F_WRLCK; 263 break; 264 } 265 } 266 267 static void 268 linux_to_bsd_flock64(bfp, lfp) 269 struct flock *bfp; 270 const struct linux_flock64 *lfp; 271 { 272 273 bfp->l_start = lfp->l_start; 274 bfp->l_len = lfp->l_len; 275 bfp->l_pid = lfp->l_pid; 276 bfp->l_whence = lfp->l_whence; 277 switch (lfp->l_type) { 278 case LINUX_F_RDLCK: 279 bfp->l_type = F_RDLCK; 280 break; 281 case LINUX_F_UNLCK: 282 bfp->l_type = F_UNLCK; 283 break; 284 case LINUX_F_WRLCK: 285 bfp->l_type = F_WRLCK; 286 break; 287 } 288 } 289 290 int 291 linux_sys_fcntl64(l, v, retval) 292 struct lwp *l; 293 void *v; 294 register_t *retval; 295 { 296 struct linux_sys_fcntl64_args /* { 297 syscallarg(int) fd; 298 syscallarg(int) cmd; 299 syscallarg(void *) arg; 300 } */ *uap = v; 301 struct proc *p = l->l_proc; 302 struct sys_fcntl_args fca; 303 struct linux_flock64 lfl; 304 struct flock bfl, *bfp; 305 int error; 306 void *sg; 307 void *arg = SCARG(uap, arg); 308 int cmd = SCARG(uap, cmd); 309 int fd = SCARG(uap, fd); 310 311 switch (cmd) { 312 case LINUX_F_GETLK64: 313 sg = stackgap_init(p, 0); 314 bfp = (struct flock *) stackgap_alloc(p, &sg, sizeof *bfp); 315 if ((error = copyin(arg, &lfl, sizeof lfl)) != 0) 316 return error; 317 linux_to_bsd_flock64(&bfl, &lfl); 318 if ((error = copyout(&bfl, bfp, sizeof bfl)) != 0) 319 return error; 320 SCARG(&fca, fd) = fd; 321 SCARG(&fca, cmd) = F_GETLK; 322 SCARG(&fca, arg) = bfp; 323 if ((error = sys_fcntl(l, &fca, retval)) != 0) 324 return error; 325 if ((error = copyin(bfp, &bfl, sizeof bfl)) != 0) 326 return error; 327 bsd_to_linux_flock64(&lfl, &bfl); 328 return copyout(&lfl, arg, sizeof lfl); 329 case LINUX_F_SETLK64: 330 case LINUX_F_SETLKW64: 331 cmd = (cmd == LINUX_F_SETLK64 ? F_SETLK : F_SETLKW); 332 if ((error = copyin(arg, &lfl, sizeof lfl)) != 0) 333 return error; 334 linux_to_bsd_flock64(&bfl, &lfl); 335 sg = stackgap_init(p, 0); 336 bfp = (struct flock *) stackgap_alloc(p, &sg, sizeof *bfp); 337 if ((error = copyout(&bfl, bfp, sizeof bfl)) != 0) 338 return error; 339 SCARG(&fca, fd) = fd; 340 SCARG(&fca, cmd) = cmd; 341 SCARG(&fca, arg) = bfp; 342 return sys_fcntl(l, &fca, retval); 343 default: 344 return linux_sys_fcntl(l, v, retval); 345 } 346 } 347 # endif /* !m69k && !amd64 && !COMPAT_LINUX32 */ 348 349 #endif /* !alpha */ 350 351 /* 352 * Linux 'readdir' call. This code is mostly taken from the 353 * SunOS getdents call (see compat/sunos/sunos_misc.c), though 354 * an attempt has been made to keep it a little cleaner. 355 * 356 * The d_off field contains the offset of the next valid entry, 357 * unless the older Linux getdents(2), which used to have it set 358 * to the offset of the entry itself. This function also doesn't 359 * need to deal with the old count == 1 glibc problem. 360 * 361 * Read in BSD-style entries, convert them, and copy them out. 362 * 363 * Note that this doesn't handle union-mounted filesystems. 364 */ 365 #ifndef COMPAT_LINUX32 366 int 367 linux_sys_getdents64(l, v, retval) 368 struct lwp *l; 369 void *v; 370 register_t *retval; 371 { 372 struct linux_sys_getdents_args /* { 373 syscallarg(int) fd; 374 syscallarg(struct linux_dirent64 *) dent; 375 syscallarg(unsigned int) count; 376 } */ *uap = v; 377 struct dirent *bdp; 378 struct vnode *vp; 379 char *inp, *tbuf; /* BSD-format */ 380 int len, reclen; /* BSD-format */ 381 char *outp; /* Linux-format */ 382 int resid, linux_reclen = 0; /* Linux-format */ 383 struct file *fp; 384 struct uio auio; 385 struct iovec aiov; 386 struct linux_dirent64 idb; 387 off_t off; /* true file offset */ 388 int buflen, error, eofflag, nbytes; 389 struct vattr va; 390 off_t *cookiebuf = NULL, *cookie; 391 int ncookies; 392 393 /* getvnode() will use the descriptor for us */ 394 if ((error = getvnode(l->l_proc->p_fd, SCARG(uap, fd), &fp)) != 0) 395 return (error); 396 397 if ((fp->f_flag & FREAD) == 0) { 398 error = EBADF; 399 goto out1; 400 } 401 402 vp = (struct vnode *)fp->f_data; 403 if (vp->v_type != VDIR) { 404 error = EINVAL; 405 goto out1; 406 } 407 408 if ((error = VOP_GETATTR(vp, &va, l->l_cred, l))) 409 goto out1; 410 411 nbytes = SCARG(uap, count); 412 buflen = min(MAXBSIZE, nbytes); 413 if (buflen < va.va_blocksize) 414 buflen = va.va_blocksize; 415 tbuf = malloc(buflen, M_TEMP, M_WAITOK); 416 417 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 418 off = fp->f_offset; 419 again: 420 aiov.iov_base = tbuf; 421 aiov.iov_len = buflen; 422 auio.uio_iov = &aiov; 423 auio.uio_iovcnt = 1; 424 auio.uio_rw = UIO_READ; 425 auio.uio_resid = buflen; 426 auio.uio_offset = off; 427 UIO_SETUP_SYSSPACE(&auio); 428 /* 429 * First we read into the malloc'ed buffer, then 430 * we massage it into user space, one record at a time. 431 */ 432 error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag, &cookiebuf, 433 &ncookies); 434 if (error) 435 goto out; 436 437 inp = tbuf; 438 outp = (void *)SCARG(uap, dent); 439 resid = nbytes; 440 if ((len = buflen - auio.uio_resid) == 0) 441 goto eof; 442 443 for (cookie = cookiebuf; len > 0; len -= reclen) { 444 bdp = (struct dirent *)inp; 445 reclen = bdp->d_reclen; 446 if (reclen & 3) 447 panic("linux_readdir"); 448 if (bdp->d_fileno == 0) { 449 inp += reclen; /* it is a hole; squish it out */ 450 if (cookie) 451 off = *cookie++; 452 else 453 off += reclen; 454 continue; 455 } 456 linux_reclen = LINUX_RECLEN(&idb, bdp->d_namlen); 457 if (reclen > len || resid < linux_reclen) { 458 /* entry too big for buffer, so just stop */ 459 outp++; 460 break; 461 } 462 if (cookie) 463 off = *cookie++; /* each entry points to next */ 464 else 465 off += reclen; 466 /* 467 * Massage in place to make a Linux-shaped dirent (otherwise 468 * we have to worry about touching user memory outside of 469 * the copyout() call). 470 */ 471 idb.d_ino = bdp->d_fileno; 472 idb.d_type = bdp->d_type; 473 idb.d_off = off; 474 idb.d_reclen = (u_short)linux_reclen; 475 strcpy(idb.d_name, bdp->d_name); 476 if ((error = copyout((void *)&idb, outp, linux_reclen))) 477 goto out; 478 /* advance past this real entry */ 479 inp += reclen; 480 /* advance output past Linux-shaped entry */ 481 outp += linux_reclen; 482 resid -= linux_reclen; 483 } 484 485 /* if we squished out the whole block, try again */ 486 if (outp == (void *)SCARG(uap, dent)) 487 goto again; 488 fp->f_offset = off; /* update the vnode offset */ 489 490 eof: 491 *retval = nbytes - resid; 492 out: 493 VOP_UNLOCK(vp, 0); 494 if (cookiebuf) 495 free(cookiebuf, M_TEMP); 496 free(tbuf, M_TEMP); 497 out1: 498 FILE_UNUSE(fp, l); 499 return error; 500 } 501 #endif /* !COMPAT_LINUX32 */ 502
Indexes created Mon Sep 29 18:09:42 GMT 2025