linux_file64.c revision 1.36.2.1
1 /* $NetBSD: linux_file64.c,v 1.36.2.1 2007/03/13 16:50:18 ad 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 1.36.2.1 2007/03/13 16:50:18 ad 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 void *sg; 158 int error; 159 struct linux_sys_stat64_args *uap = v; 160 161 sg = stackgap_init(l->l_proc, 0); 162 CHECK_ALT_EXIST(l, &sg, SCARG(uap, path)); 163 164 error = do_sys_stat(l, SCARG(uap, path), flags, &tmpst); 165 if (error != 0) 166 return error; 167 168 bsd_to_linux_stat(&tmpst, &tmplst); 169 170 return copyout(&tmplst, SCARG(uap, sp), sizeof tmplst); 171 } 172 173 int 174 linux_sys_stat64(l, v, retval) 175 struct lwp *l; 176 void *v; 177 register_t *retval; 178 { 179 struct linux_sys_stat64_args /* { 180 syscallarg(const char *) path; 181 syscallarg(struct linux_stat64 *) sp; 182 } */ *uap = v; 183 184 return linux_do_stat64(l, uap, retval, FOLLOW); 185 } 186 187 int 188 linux_sys_lstat64(l, v, retval) 189 struct lwp *l; 190 void *v; 191 register_t *retval; 192 { 193 struct linux_sys_lstat64_args /* { 194 syscallarg(const char *) path; 195 syscallarg(struct linux_stat64 *) sp; 196 } */ *uap = v; 197 198 return linux_do_stat64(l, uap, retval, NOFOLLOW); 199 } 200 201 int 202 linux_sys_truncate64(l, v, retval) 203 struct lwp *l; 204 void *v; 205 register_t *retval; 206 { 207 struct linux_sys_truncate64_args /* { 208 syscallarg(const char *) path; 209 syscallarg(off_t) length; 210 } */ *uap = v; 211 struct sys_truncate_args ta; 212 struct proc *p = l->l_proc; 213 void *sg = stackgap_init(p, 0); 214 215 CHECK_ALT_EXIST(l, &sg, SCARG(uap, path)); 216 217 /* Linux doesn't have the 'pad' pseudo-parameter */ 218 SCARG(&ta, path) = SCARG(uap, path); 219 SCARG(&ta, pad) = 0; 220 SCARG(&ta, length) = SCARG(uap, length); 221 222 return sys_truncate(l, &ta, retval); 223 } 224 225 int 226 linux_sys_ftruncate64(l, v, retval) 227 struct lwp *l; 228 void *v; 229 register_t *retval; 230 { 231 struct linux_sys_ftruncate64_args /* { 232 syscallarg(unsigned int) fd; 233 syscallarg(off_t) length; 234 } */ *uap = v; 235 struct sys_ftruncate_args ta; 236 237 /* Linux doesn't have the 'pad' pseudo-parameter */ 238 SCARG(&ta, fd) = SCARG(uap, fd); 239 SCARG(&ta, pad) = 0; 240 SCARG(&ta, length) = SCARG(uap, length); 241 242 return sys_ftruncate(l, &ta, retval); 243 } 244 # endif /* !COMPAT_LINUX32 */ 245 246 # if !defined(__m68k__) && (!defined(__amd64__) || defined(COMPAT_LINUX32)) 247 static void bsd_to_linux_flock64 __P((struct linux_flock64 *, 248 const struct flock *)); 249 static void linux_to_bsd_flock64 __P((struct flock *, 250 const struct linux_flock64 *)); 251 252 static void 253 bsd_to_linux_flock64(lfp, bfp) 254 struct linux_flock64 *lfp; 255 const struct flock *bfp; 256 { 257 258 lfp->l_start = bfp->l_start; 259 lfp->l_len = bfp->l_len; 260 lfp->l_pid = bfp->l_pid; 261 lfp->l_whence = bfp->l_whence; 262 switch (bfp->l_type) { 263 case F_RDLCK: 264 lfp->l_type = LINUX_F_RDLCK; 265 break; 266 case F_UNLCK: 267 lfp->l_type = LINUX_F_UNLCK; 268 break; 269 case F_WRLCK: 270 lfp->l_type = LINUX_F_WRLCK; 271 break; 272 } 273 } 274 275 static void 276 linux_to_bsd_flock64(bfp, lfp) 277 struct flock *bfp; 278 const struct linux_flock64 *lfp; 279 { 280 281 bfp->l_start = lfp->l_start; 282 bfp->l_len = lfp->l_len; 283 bfp->l_pid = lfp->l_pid; 284 bfp->l_whence = lfp->l_whence; 285 switch (lfp->l_type) { 286 case LINUX_F_RDLCK: 287 bfp->l_type = F_RDLCK; 288 break; 289 case LINUX_F_UNLCK: 290 bfp->l_type = F_UNLCK; 291 break; 292 case LINUX_F_WRLCK: 293 bfp->l_type = F_WRLCK; 294 break; 295 } 296 } 297 298 int 299 linux_sys_fcntl64(l, v, retval) 300 struct lwp *l; 301 void *v; 302 register_t *retval; 303 { 304 struct linux_sys_fcntl64_args /* { 305 syscallarg(int) fd; 306 syscallarg(int) cmd; 307 syscallarg(void *) arg; 308 } */ *uap = v; 309 struct proc *p = l->l_proc; 310 struct sys_fcntl_args fca; 311 struct linux_flock64 lfl; 312 struct flock bfl, *bfp; 313 int error; 314 void *sg; 315 void *arg = SCARG(uap, arg); 316 int cmd = SCARG(uap, cmd); 317 int fd = SCARG(uap, fd); 318 319 switch (cmd) { 320 case LINUX_F_GETLK64: 321 sg = stackgap_init(p, 0); 322 bfp = (struct flock *) stackgap_alloc(p, &sg, sizeof *bfp); 323 if ((error = copyin(arg, &lfl, sizeof lfl)) != 0) 324 return error; 325 linux_to_bsd_flock64(&bfl, &lfl); 326 if ((error = copyout(&bfl, bfp, sizeof bfl)) != 0) 327 return error; 328 SCARG(&fca, fd) = fd; 329 SCARG(&fca, cmd) = F_GETLK; 330 SCARG(&fca, arg) = bfp; 331 if ((error = sys_fcntl(l, &fca, retval)) != 0) 332 return error; 333 if ((error = copyin(bfp, &bfl, sizeof bfl)) != 0) 334 return error; 335 bsd_to_linux_flock64(&lfl, &bfl); 336 return copyout(&lfl, arg, sizeof lfl); 337 case LINUX_F_SETLK64: 338 case LINUX_F_SETLKW64: 339 cmd = (cmd == LINUX_F_SETLK64 ? F_SETLK : F_SETLKW); 340 if ((error = copyin(arg, &lfl, sizeof lfl)) != 0) 341 return error; 342 linux_to_bsd_flock64(&bfl, &lfl); 343 sg = stackgap_init(p, 0); 344 bfp = (struct flock *) stackgap_alloc(p, &sg, sizeof *bfp); 345 if ((error = copyout(&bfl, bfp, sizeof bfl)) != 0) 346 return error; 347 SCARG(&fca, fd) = fd; 348 SCARG(&fca, cmd) = cmd; 349 SCARG(&fca, arg) = bfp; 350 return sys_fcntl(l, &fca, retval); 351 default: 352 return linux_sys_fcntl(l, v, retval); 353 } 354 } 355 # endif /* !m69k && !amd64 && !COMPAT_LINUX32 */ 356 357 #endif /* !alpha */ 358 359 /* 360 * Linux 'readdir' call. This code is mostly taken from the 361 * SunOS getdents call (see compat/sunos/sunos_misc.c), though 362 * an attempt has been made to keep it a little cleaner. 363 * 364 * The d_off field contains the offset of the next valid entry, 365 * unless the older Linux getdents(2), which used to have it set 366 * to the offset of the entry itself. This function also doesn't 367 * need to deal with the old count == 1 glibc problem. 368 * 369 * Read in BSD-style entries, convert them, and copy them out. 370 * 371 * Note that this doesn't handle union-mounted filesystems. 372 */ 373 #ifndef COMPAT_LINUX32 374 int 375 linux_sys_getdents64(l, v, retval) 376 struct lwp *l; 377 void *v; 378 register_t *retval; 379 { 380 struct linux_sys_getdents_args /* { 381 syscallarg(int) fd; 382 syscallarg(struct linux_dirent64 *) dent; 383 syscallarg(unsigned int) count; 384 } */ *uap = v; 385 struct dirent *bdp; 386 struct vnode *vp; 387 char *inp, *tbuf; /* BSD-format */ 388 int len, reclen; /* BSD-format */ 389 char *outp; /* Linux-format */ 390 int resid, linux_reclen = 0; /* Linux-format */ 391 struct file *fp; 392 struct uio auio; 393 struct iovec aiov; 394 struct linux_dirent64 idb; 395 off_t off; /* true file offset */ 396 int buflen, error, eofflag, nbytes; 397 struct vattr va; 398 off_t *cookiebuf = NULL, *cookie; 399 int ncookies; 400 401 /* getvnode() will use the descriptor for us */ 402 if ((error = getvnode(l->l_proc->p_fd, SCARG(uap, fd), &fp)) != 0) 403 return (error); 404 405 if ((fp->f_flag & FREAD) == 0) { 406 error = EBADF; 407 goto out1; 408 } 409 410 vp = (struct vnode *)fp->f_data; 411 if (vp->v_type != VDIR) { 412 error = EINVAL; 413 goto out1; 414 } 415 416 if ((error = VOP_GETATTR(vp, &va, l->l_cred, l))) 417 goto out1; 418 419 nbytes = SCARG(uap, count); 420 buflen = min(MAXBSIZE, nbytes); 421 if (buflen < va.va_blocksize) 422 buflen = va.va_blocksize; 423 tbuf = malloc(buflen, M_TEMP, M_WAITOK); 424 425 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 426 off = fp->f_offset; 427 again: 428 aiov.iov_base = tbuf; 429 aiov.iov_len = buflen; 430 auio.uio_iov = &aiov; 431 auio.uio_iovcnt = 1; 432 auio.uio_rw = UIO_READ; 433 auio.uio_resid = buflen; 434 auio.uio_offset = off; 435 UIO_SETUP_SYSSPACE(&auio); 436 /* 437 * First we read into the malloc'ed buffer, then 438 * we massage it into user space, one record at a time. 439 */ 440 error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag, &cookiebuf, 441 &ncookies); 442 if (error) 443 goto out; 444 445 inp = tbuf; 446 outp = (void *)SCARG(uap, dent); 447 resid = nbytes; 448 if ((len = buflen - auio.uio_resid) == 0) 449 goto eof; 450 451 for (cookie = cookiebuf; len > 0; len -= reclen) { 452 bdp = (struct dirent *)inp; 453 reclen = bdp->d_reclen; 454 if (reclen & 3) 455 panic("linux_readdir"); 456 if (bdp->d_fileno == 0) { 457 inp += reclen; /* it is a hole; squish it out */ 458 if (cookie) 459 off = *cookie++; 460 else 461 off += reclen; 462 continue; 463 } 464 linux_reclen = LINUX_RECLEN(&idb, bdp->d_namlen); 465 if (reclen > len || resid < linux_reclen) { 466 /* entry too big for buffer, so just stop */ 467 outp++; 468 break; 469 } 470 if (cookie) 471 off = *cookie++; /* each entry points to next */ 472 else 473 off += reclen; 474 /* 475 * Massage in place to make a Linux-shaped dirent (otherwise 476 * we have to worry about touching user memory outside of 477 * the copyout() call). 478 */ 479 idb.d_ino = bdp->d_fileno; 480 idb.d_type = bdp->d_type; 481 idb.d_off = off; 482 idb.d_reclen = (u_short)linux_reclen; 483 strcpy(idb.d_name, bdp->d_name); 484 if ((error = copyout((void *)&idb, outp, linux_reclen))) 485 goto out; 486 /* advance past this real entry */ 487 inp += reclen; 488 /* advance output past Linux-shaped entry */ 489 outp += linux_reclen; 490 resid -= linux_reclen; 491 } 492 493 /* if we squished out the whole block, try again */ 494 if (outp == (void *)SCARG(uap, dent)) 495 goto again; 496 fp->f_offset = off; /* update the vnode offset */ 497 498 eof: 499 *retval = nbytes - resid; 500 out: 501 VOP_UNLOCK(vp, 0); 502 if (cookiebuf) 503 free(cookiebuf, M_TEMP); 504 free(tbuf, M_TEMP); 505 out1: 506 FILE_UNUSE(fp, l); 507 return error; 508 } 509 #endif /* !COMPAT_LINUX32 */ 510
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