linux_file64.c revision 1.18.2.1
1 /* $NetBSD: linux_file64.c,v 1.18.2.1 2004/05/11 14:30:50 tron 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 1.18.2.1 2004/05/11 14:30:50 tron 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 static void bsd_to_linux_stat __P((struct stat *, struct linux_stat64 *)); 76 static int linux_do_stat64 __P((struct proc *, void *, register_t *, int)); 77 78 /* 79 * Convert a NetBSD stat structure to a Linux stat structure. 80 * Only the order of the fields and the padding in the structure 81 * is different. linux_fakedev is a machine-dependent function 82 * which optionally converts device driver major/minor numbers 83 * (XXX horrible, but what can you do against code that compares 84 * things against constant major device numbers? sigh) 85 */ 86 static void 87 bsd_to_linux_stat(bsp, lsp) 88 struct stat *bsp; 89 struct linux_stat64 *lsp; 90 { 91 lsp->lst_dev = linux_fakedev(bsp->st_dev, 0); 92 lsp->lst_ino = bsp->st_ino; 93 lsp->lst_mode = (linux_mode_t)bsp->st_mode; 94 if (bsp->st_nlink >= (1 << 15)) 95 lsp->lst_nlink = (1 << 15) - 1; 96 else 97 lsp->lst_nlink = (linux_nlink_t)bsp->st_nlink; 98 lsp->lst_uid = bsp->st_uid; 99 lsp->lst_gid = bsp->st_gid; 100 lsp->lst_rdev = linux_fakedev(bsp->st_rdev, 1); 101 lsp->lst_size = bsp->st_size; 102 lsp->lst_blksize = bsp->st_blksize; 103 lsp->lst_blocks = bsp->st_blocks; 104 lsp->lst_atime = bsp->st_atime; 105 lsp->lst_mtime = bsp->st_mtime; 106 lsp->lst_ctime = bsp->st_ctime; 107 #if LINUX_STAT64_HAS_BROKEN_ST_INO 108 lsp->__lst_ino = (linux_ino_t) bsp->st_ino; 109 #endif 110 } 111 112 /* 113 * The stat functions below are plain sailing. stat and lstat are handled 114 * by one function to avoid code duplication. 115 */ 116 int 117 linux_sys_fstat64(p, v, retval) 118 struct proc *p; 119 void *v; 120 register_t *retval; 121 { 122 struct linux_sys_fstat64_args /* { 123 syscallarg(int) fd; 124 syscallarg(struct linux_stat64 *) sp; 125 } */ *uap = v; 126 struct sys___fstat13_args fsa; 127 struct linux_stat64 tmplst; 128 struct stat *st,tmpst; 129 caddr_t sg; 130 int error; 131 132 sg = stackgap_init(p, 0); 133 134 st = stackgap_alloc(p, &sg, sizeof (struct stat)); 135 136 SCARG(&fsa, fd) = SCARG(uap, fd); 137 SCARG(&fsa, sb) = st; 138 139 if ((error = sys___fstat13(p, &fsa, retval))) 140 return error; 141 142 if ((error = copyin(st, &tmpst, sizeof tmpst))) 143 return error; 144 145 bsd_to_linux_stat(&tmpst, &tmplst); 146 147 if ((error = copyout(&tmplst, SCARG(uap, sp), sizeof tmplst))) 148 return error; 149 150 return 0; 151 } 152 153 static int 154 linux_do_stat64(p, v, retval, dolstat) 155 struct proc *p; 156 void *v; 157 register_t *retval; 158 int dolstat; 159 { 160 struct sys___stat13_args sa; 161 struct linux_stat64 tmplst; 162 struct stat *st, tmpst; 163 caddr_t sg; 164 int error; 165 struct linux_sys_stat64_args *uap = v; 166 167 sg = stackgap_init(p, 0); 168 st = stackgap_alloc(p, &sg, sizeof (struct stat)); 169 CHECK_ALT_EXIST(p, &sg, SCARG(uap, path)); 170 171 SCARG(&sa, ub) = st; 172 SCARG(&sa, path) = SCARG(uap, path); 173 174 if ((error = (dolstat ? sys___lstat13(p, &sa, retval) : 175 sys___stat13(p, &sa, retval)))) 176 return error; 177 178 if ((error = copyin(st, &tmpst, sizeof tmpst))) 179 return error; 180 181 bsd_to_linux_stat(&tmpst, &tmplst); 182 183 if ((error = copyout(&tmplst, SCARG(uap, sp), sizeof tmplst))) 184 return error; 185 186 return 0; 187 } 188 189 int 190 linux_sys_stat64(p, v, retval) 191 struct proc *p; 192 void *v; 193 register_t *retval; 194 { 195 struct linux_sys_stat64_args /* { 196 syscallarg(const char *) path; 197 syscallarg(struct linux_stat64 *) sp; 198 } */ *uap = v; 199 200 return linux_do_stat64(p, uap, retval, 0); 201 } 202 203 int 204 linux_sys_lstat64(p, v, retval) 205 struct proc *p; 206 void *v; 207 register_t *retval; 208 { 209 struct linux_sys_lstat64_args /* { 210 syscallarg(const char *) path; 211 syscallarg(struct linux_stat64 *) sp; 212 } */ *uap = v; 213 214 return linux_do_stat64(p, uap, retval, 1); 215 } 216 217 int 218 linux_sys_truncate64(p, v, retval) 219 struct proc *p; 220 void *v; 221 register_t *retval; 222 { 223 struct linux_sys_truncate64_args /* { 224 syscallarg(const char *) path; 225 syscallarg(off_t) length; 226 } */ *uap = v; 227 struct sys_truncate_args ta; 228 229 caddr_t sg = stackgap_init(p, 0); 230 231 CHECK_ALT_EXIST(p, &sg, SCARG(uap, path)); 232 233 /* Linux doesn't have the 'pad' pseudo-parameter */ 234 SCARG(&ta, path) = SCARG(uap, path); 235 SCARG(&ta, pad) = 0; 236 SCARG(&ta, length) = SCARG(uap, length); 237 238 return sys_truncate(p, &ta, retval); 239 } 240 241 int 242 linux_sys_ftruncate64(p, v, retval) 243 struct proc *p; 244 void *v; 245 register_t *retval; 246 { 247 248 struct linux_sys_ftruncate64_args /* { 249 syscallarg(int) fd; 250 syscallarg(off_t) length; 251 } */ *uap = v; 252 struct sys_ftruncate_args ta; 253 254 /* Linux doesn't have the 'pad' pseudo-parameter */ 255 SCARG(&ta, fd) = SCARG(uap, fd); 256 SCARG(&ta, pad) = 0; 257 SCARG(&ta, length) = SCARG(uap, length); 258 259 return sys_ftruncate(p, &ta, retval); 260 } 261 262 #if !defined(__m68k__) 263 static void bsd_to_linux_flock64 __P((struct linux_flock64 *, 264 const struct flock *)); 265 static void linux_to_bsd_flock64 __P((struct flock *, 266 const struct linux_flock64 *)); 267 268 static void 269 bsd_to_linux_flock64(lfp, bfp) 270 struct linux_flock64 *lfp; 271 const struct flock *bfp; 272 { 273 274 lfp->l_start = bfp->l_start; 275 lfp->l_len = bfp->l_len; 276 lfp->l_pid = bfp->l_pid; 277 lfp->l_whence = bfp->l_whence; 278 switch (bfp->l_type) { 279 case F_RDLCK: 280 lfp->l_type = LINUX_F_RDLCK; 281 break; 282 case F_UNLCK: 283 lfp->l_type = LINUX_F_UNLCK; 284 break; 285 case F_WRLCK: 286 lfp->l_type = LINUX_F_WRLCK; 287 break; 288 } 289 } 290 291 static void 292 linux_to_bsd_flock64(bfp, lfp) 293 struct flock *bfp; 294 const struct linux_flock64 *lfp; 295 { 296 297 bfp->l_start = lfp->l_start; 298 bfp->l_len = lfp->l_len; 299 bfp->l_pid = lfp->l_pid; 300 bfp->l_whence = lfp->l_whence; 301 switch (lfp->l_type) { 302 case LINUX_F_RDLCK: 303 bfp->l_type = F_RDLCK; 304 break; 305 case LINUX_F_UNLCK: 306 bfp->l_type = F_UNLCK; 307 break; 308 case LINUX_F_WRLCK: 309 bfp->l_type = F_WRLCK; 310 break; 311 } 312 } 313 314 int 315 linux_sys_fcntl64(p, v, retval) 316 struct proc *p; 317 void *v; 318 register_t *retval; 319 { 320 struct linux_sys_fcntl64_args /* { 321 syscallarg(int) fd; 322 syscallarg(int) cmd; 323 syscallarg(void *) arg; 324 } */ *uap = v; 325 struct sys_fcntl_args fca; 326 struct linux_flock64 lfl; 327 struct flock bfl, *bfp; 328 int error; 329 caddr_t sg; 330 void *arg = SCARG(uap, arg); 331 int cmd = SCARG(uap, cmd); 332 int fd = SCARG(uap, fd); 333 334 switch (cmd) { 335 case LINUX_F_GETLK64: 336 sg = stackgap_init(p, 0); 337 bfp = (struct flock *) stackgap_alloc(p, &sg, sizeof *bfp); 338 if ((error = copyin(arg, &lfl, sizeof lfl)) != 0) 339 return error; 340 linux_to_bsd_flock64(&bfl, &lfl); 341 if ((error = copyout(&bfl, bfp, sizeof bfl)) != 0) 342 return error; 343 SCARG(&fca, fd) = fd; 344 SCARG(&fca, cmd) = F_GETLK; 345 SCARG(&fca, arg) = bfp; 346 if ((error = sys_fcntl(p, &fca, retval)) != 0) 347 return error; 348 if ((error = copyin(bfp, &bfl, sizeof bfl)) != 0) 349 return error; 350 bsd_to_linux_flock64(&lfl, &bfl); 351 return copyout(&lfl, arg, sizeof lfl); 352 case LINUX_F_SETLK64: 353 case LINUX_F_SETLKW64: 354 cmd = (cmd == LINUX_F_SETLK64 ? F_SETLK : F_SETLKW); 355 if ((error = copyin(arg, &lfl, sizeof lfl)) != 0) 356 return error; 357 linux_to_bsd_flock64(&bfl, &lfl); 358 sg = stackgap_init(p, 0); 359 bfp = (struct flock *) stackgap_alloc(p, &sg, sizeof *bfp); 360 if ((error = copyout(&bfl, bfp, sizeof bfl)) != 0) 361 return error; 362 SCARG(&fca, fd) = fd; 363 SCARG(&fca, cmd) = cmd; 364 SCARG(&fca, arg) = bfp; 365 return sys_fcntl(p, &fca, retval); 366 default: 367 return linux_sys_fcntl(p, v, retval); 368 } 369 } 370 #endif /* !m68k */ 371 372 #endif /* !alpha */ 373 374 /* 375 * Linux 'readdir' call. This code is mostly taken from the 376 * SunOS getdents call (see compat/sunos/sunos_misc.c), though 377 * an attempt has been made to keep it a little cleaner. 378 * 379 * The d_off field contains the offset of the next valid entry, 380 * unless the older Linux getdents(2), which used to have it set 381 * to the offset of the entry itself. This function also doesn't 382 * need to deal with the old count == 1 glibc problem. 383 * 384 * Read in BSD-style entries, convert them, and copy them out. 385 * 386 * Note that this doesn't handle union-mounted filesystems. 387 */ 388 int 389 linux_sys_getdents64(p, v, retval) 390 struct proc *p; 391 void *v; 392 register_t *retval; 393 { 394 struct linux_sys_getdents_args /* { 395 syscallarg(int) fd; 396 syscallarg(struct linux_dirent64 *) dent; 397 syscallarg(unsigned int) count; 398 } */ *uap = v; 399 struct dirent *bdp; 400 struct vnode *vp; 401 caddr_t inp, buf; /* BSD-format */ 402 int len, reclen; /* BSD-format */ 403 caddr_t outp; /* Linux-format */ 404 int resid, linux_reclen = 0; /* Linux-format */ 405 struct file *fp; 406 struct uio auio; 407 struct iovec aiov; 408 struct linux_dirent64 idb; 409 off_t off; /* true file offset */ 410 int buflen, error, eofflag, nbytes; 411 struct vattr va; 412 off_t *cookiebuf = NULL, *cookie; 413 int ncookies; 414 415 /* getvnode() will use the descriptor for us */ 416 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 417 return (error); 418 419 if ((fp->f_flag & FREAD) == 0) { 420 error = EBADF; 421 goto out1; 422 } 423 424 vp = (struct vnode *)fp->f_data; 425 if (vp->v_type != VDIR) { 426 error = EINVAL; 427 goto out1; 428 } 429 430 if ((error = VOP_GETATTR(vp, &va, p->p_ucred, p))) 431 goto out1; 432 433 nbytes = SCARG(uap, count); 434 buflen = min(MAXBSIZE, nbytes); 435 if (buflen < va.va_blocksize) 436 buflen = va.va_blocksize; 437 buf = malloc(buflen, M_TEMP, M_WAITOK); 438 439 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 440 off = fp->f_offset; 441 again: 442 aiov.iov_base = buf; 443 aiov.iov_len = buflen; 444 auio.uio_iov = &aiov; 445 auio.uio_iovcnt = 1; 446 auio.uio_rw = UIO_READ; 447 auio.uio_segflg = UIO_SYSSPACE; 448 auio.uio_procp = p; 449 auio.uio_resid = buflen; 450 auio.uio_offset = off; 451 /* 452 * First we read into the malloc'ed buffer, then 453 * we massage it into user space, one record at a time. 454 */ 455 error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag, &cookiebuf, 456 &ncookies); 457 if (error) 458 goto out; 459 460 inp = buf; 461 outp = (caddr_t)SCARG(uap, dent); 462 resid = nbytes; 463 if ((len = buflen - auio.uio_resid) == 0) 464 goto eof; 465 466 for (cookie = cookiebuf; len > 0; len -= reclen) { 467 bdp = (struct dirent *)inp; 468 reclen = bdp->d_reclen; 469 if (reclen & 3) 470 panic("linux_readdir"); 471 if (bdp->d_fileno == 0) { 472 inp += reclen; /* it is a hole; squish it out */ 473 off = *cookie++; 474 continue; 475 } 476 linux_reclen = LINUX_RECLEN(&idb, bdp->d_namlen); 477 if (reclen > len || resid < linux_reclen) { 478 /* entry too big for buffer, so just stop */ 479 outp++; 480 break; 481 } 482 off = *cookie++; /* each entry points to next */ 483 /* 484 * Massage in place to make a Linux-shaped dirent (otherwise 485 * we have to worry about touching user memory outside of 486 * the copyout() call). 487 */ 488 idb.d_ino = bdp->d_fileno; 489 idb.d_type = bdp->d_type; 490 idb.d_off = off; 491 idb.d_reclen = (u_short)linux_reclen; 492 strcpy(idb.d_name, bdp->d_name); 493 if ((error = copyout((caddr_t)&idb, outp, linux_reclen))) 494 goto out; 495 /* advance past this real entry */ 496 inp += reclen; 497 /* advance output past Linux-shaped entry */ 498 outp += linux_reclen; 499 resid -= linux_reclen; 500 } 501 502 /* if we squished out the whole block, try again */ 503 if (outp == (caddr_t)SCARG(uap, dent)) 504 goto again; 505 fp->f_offset = off; /* update the vnode offset */ 506 507 eof: 508 *retval = nbytes - resid; 509 out: 510 VOP_UNLOCK(vp, 0); 511 if (cookiebuf) 512 free(cookiebuf, M_TEMP); 513 free(buf, M_TEMP); 514 out1: 515 FILE_UNUSE(fp, p); 516 return error; 517 } 518
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