linux_file64.c revision 1.42
1 /* $NetBSD: linux_file64.c,v 1.42 2007/12/04 18:40:15 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 1.42 2007/12/04 18:40:15 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 #include <compat/linux/common/linux_ipc.h> 73 #include <compat/linux/common/linux_sem.h> 74 75 #include <compat/linux/linux_syscallargs.h> 76 77 #ifndef alpha 78 79 # ifndef COMPAT_LINUX32 80 81 static void bsd_to_linux_stat(struct stat *, struct linux_stat64 *); 82 static int linux_do_stat64(struct lwp *, void *, register_t *, int); 83 84 /* 85 * Convert a NetBSD stat structure to a Linux stat structure. 86 * Only the order of the fields and the padding in the structure 87 * is different. linux_fakedev is a machine-dependent function 88 * which optionally converts device driver major/minor numbers 89 * (XXX horrible, but what can you do against code that compares 90 * things against constant major device numbers? sigh) 91 */ 92 static void 93 bsd_to_linux_stat(bsp, lsp) 94 struct stat *bsp; 95 struct linux_stat64 *lsp; 96 { 97 lsp->lst_dev = linux_fakedev(bsp->st_dev, 0); 98 lsp->lst_ino = bsp->st_ino; 99 lsp->lst_mode = (linux_mode_t)bsp->st_mode; 100 if (bsp->st_nlink >= (1 << 15)) 101 lsp->lst_nlink = (1 << 15) - 1; 102 else 103 lsp->lst_nlink = (linux_nlink_t)bsp->st_nlink; 104 lsp->lst_uid = bsp->st_uid; 105 lsp->lst_gid = bsp->st_gid; 106 lsp->lst_rdev = linux_fakedev(bsp->st_rdev, 1); 107 lsp->lst_size = bsp->st_size; 108 lsp->lst_blksize = bsp->st_blksize; 109 lsp->lst_blocks = bsp->st_blocks; 110 lsp->lst_atime = bsp->st_atime; 111 lsp->lst_mtime = bsp->st_mtime; 112 lsp->lst_ctime = bsp->st_ctime; 113 # ifdef LINUX_STAT64_HAS_NSEC 114 lsp->lst_atime_nsec = bsp->st_atimensec; 115 lsp->lst_mtime_nsec = bsp->st_mtimensec; 116 lsp->lst_ctime_nsec = bsp->st_ctimensec; 117 # endif 118 # if LINUX_STAT64_HAS_BROKEN_ST_INO 119 lsp->__lst_ino = (linux_ino_t) bsp->st_ino; 120 # endif 121 } 122 123 /* 124 * The stat functions below are plain sailing. stat and lstat are handled 125 * by one function to avoid code duplication. 126 */ 127 int 128 linux_sys_fstat64(l, v, retval) 129 struct lwp *l; 130 void *v; 131 register_t *retval; 132 { 133 struct linux_sys_fstat64_args /* { 134 syscallarg(int) fd; 135 syscallarg(struct linux_stat64 *) sp; 136 } */ *uap = v; 137 struct linux_stat64 tmplst; 138 struct stat tmpst; 139 int error; 140 141 error = do_sys_fstat(l, SCARG(uap, fd), &tmpst); 142 if (error != 0) 143 return error; 144 145 bsd_to_linux_stat(&tmpst, &tmplst); 146 147 return copyout(&tmplst, SCARG(uap, sp), sizeof tmplst); 148 } 149 150 static int 151 linux_do_stat64(l, v, retval, flags) 152 struct lwp *l; 153 void *v; 154 register_t *retval; 155 int flags; 156 { 157 struct linux_stat64 tmplst; 158 struct stat tmpst; 159 int error; 160 struct linux_sys_stat64_args *uap = v; 161 162 error = do_sys_stat(l, SCARG(uap, path), flags, &tmpst); 163 if (error != 0) 164 return error; 165 166 bsd_to_linux_stat(&tmpst, &tmplst); 167 168 return copyout(&tmplst, SCARG(uap, sp), sizeof tmplst); 169 } 170 171 int 172 linux_sys_stat64(l, v, retval) 173 struct lwp *l; 174 void *v; 175 register_t *retval; 176 { 177 struct linux_sys_stat64_args /* { 178 syscallarg(const char *) path; 179 syscallarg(struct linux_stat64 *) sp; 180 } */ *uap = v; 181 182 return linux_do_stat64(l, uap, retval, FOLLOW); 183 } 184 185 int 186 linux_sys_lstat64(l, v, retval) 187 struct lwp *l; 188 void *v; 189 register_t *retval; 190 { 191 struct linux_sys_lstat64_args /* { 192 syscallarg(const char *) path; 193 syscallarg(struct linux_stat64 *) sp; 194 } */ *uap = v; 195 196 return linux_do_stat64(l, uap, retval, NOFOLLOW); 197 } 198 199 int 200 linux_sys_truncate64(l, v, retval) 201 struct lwp *l; 202 void *v; 203 register_t *retval; 204 { 205 struct linux_sys_truncate64_args /* { 206 syscallarg(const char *) path; 207 syscallarg(off_t) length; 208 } */ *uap = v; 209 struct sys_truncate_args ta; 210 211 /* Linux doesn't have the 'pad' pseudo-parameter */ 212 SCARG(&ta, path) = SCARG(uap, path); 213 SCARG(&ta, pad) = 0; 214 SCARG(&ta, length) = SCARG(uap, length); 215 216 return sys_truncate(l, &ta, retval); 217 } 218 219 int 220 linux_sys_ftruncate64(l, v, retval) 221 struct lwp *l; 222 void *v; 223 register_t *retval; 224 { 225 struct linux_sys_ftruncate64_args /* { 226 syscallarg(unsigned int) fd; 227 syscallarg(off_t) length; 228 } */ *uap = v; 229 struct sys_ftruncate_args ta; 230 231 /* Linux doesn't have the 'pad' pseudo-parameter */ 232 SCARG(&ta, fd) = SCARG(uap, fd); 233 SCARG(&ta, pad) = 0; 234 SCARG(&ta, length) = SCARG(uap, length); 235 236 return sys_ftruncate(l, &ta, retval); 237 } 238 # endif /* !COMPAT_LINUX32 */ 239 240 # if !defined(__m68k__) && (!defined(__amd64__) || defined(COMPAT_LINUX32)) 241 static void bsd_to_linux_flock64(struct linux_flock64 *, 242 const struct flock *); 243 static void linux_to_bsd_flock64(struct flock *, 244 const struct linux_flock64 *); 245 246 static void 247 bsd_to_linux_flock64(lfp, bfp) 248 struct linux_flock64 *lfp; 249 const struct flock *bfp; 250 { 251 252 lfp->l_start = bfp->l_start; 253 lfp->l_len = bfp->l_len; 254 lfp->l_pid = bfp->l_pid; 255 lfp->l_whence = bfp->l_whence; 256 switch (bfp->l_type) { 257 case F_RDLCK: 258 lfp->l_type = LINUX_F_RDLCK; 259 break; 260 case F_UNLCK: 261 lfp->l_type = LINUX_F_UNLCK; 262 break; 263 case F_WRLCK: 264 lfp->l_type = LINUX_F_WRLCK; 265 break; 266 } 267 } 268 269 static void 270 linux_to_bsd_flock64(bfp, lfp) 271 struct flock *bfp; 272 const struct linux_flock64 *lfp; 273 { 274 275 bfp->l_start = lfp->l_start; 276 bfp->l_len = lfp->l_len; 277 bfp->l_pid = lfp->l_pid; 278 bfp->l_whence = lfp->l_whence; 279 switch (lfp->l_type) { 280 case LINUX_F_RDLCK: 281 bfp->l_type = F_RDLCK; 282 break; 283 case LINUX_F_UNLCK: 284 bfp->l_type = F_UNLCK; 285 break; 286 case LINUX_F_WRLCK: 287 bfp->l_type = F_WRLCK; 288 break; 289 } 290 } 291 292 int 293 linux_sys_fcntl64(l, v, retval) 294 struct lwp *l; 295 void *v; 296 register_t *retval; 297 { 298 struct linux_sys_fcntl64_args /* { 299 syscallarg(int) fd; 300 syscallarg(int) cmd; 301 syscallarg(void *) arg; 302 } */ *uap = v; 303 struct linux_flock64 lfl; 304 struct flock bfl; 305 int error; 306 void *arg = SCARG(uap, arg); 307 int cmd = SCARG(uap, cmd); 308 int fd = SCARG(uap, fd); 309 310 switch (cmd) { 311 case LINUX_F_GETLK64: 312 if ((error = copyin(arg, &lfl, sizeof lfl)) != 0) 313 return error; 314 linux_to_bsd_flock64(&bfl, &lfl); 315 error = do_fcntl_lock(l, fd, F_GETLK, &bfl); 316 if (error != 0) 317 return error; 318 bsd_to_linux_flock64(&lfl, &bfl); 319 return copyout(&lfl, arg, sizeof lfl); 320 case LINUX_F_SETLK64: 321 case LINUX_F_SETLKW64: 322 cmd = (cmd == LINUX_F_SETLK64 ? F_SETLK : F_SETLKW); 323 if ((error = copyin(arg, &lfl, sizeof lfl)) != 0) 324 return error; 325 linux_to_bsd_flock64(&bfl, &lfl); 326 return do_fcntl_lock(l, fd, cmd, &bfl); 327 default: 328 return linux_sys_fcntl(l, v, retval); 329 } 330 } 331 # endif /* !m69k && !amd64 && !COMPAT_LINUX32 */ 332 333 #endif /* !alpha */ 334 335 /* 336 * Linux 'readdir' call. This code is mostly taken from the 337 * SunOS getdents call (see compat/sunos/sunos_misc.c), though 338 * an attempt has been made to keep it a little cleaner. 339 * 340 * The d_off field contains the offset of the next valid entry, 341 * unless the older Linux getdents(2), which used to have it set 342 * to the offset of the entry itself. This function also doesn't 343 * need to deal with the old count == 1 glibc problem. 344 * 345 * Read in BSD-style entries, convert them, and copy them out. 346 * 347 * Note that this doesn't handle union-mounted filesystems. 348 */ 349 #ifndef COMPAT_LINUX32 350 int 351 linux_sys_getdents64(l, v, retval) 352 struct lwp *l; 353 void *v; 354 register_t *retval; 355 { 356 struct linux_sys_getdents_args /* { 357 syscallarg(int) fd; 358 syscallarg(struct linux_dirent64 *) dent; 359 syscallarg(unsigned int) count; 360 } */ *uap = v; 361 struct dirent *bdp; 362 struct vnode *vp; 363 char *inp, *tbuf; /* BSD-format */ 364 int len, reclen; /* BSD-format */ 365 char *outp; /* Linux-format */ 366 int resid, linux_reclen = 0; /* Linux-format */ 367 struct file *fp; 368 struct uio auio; 369 struct iovec aiov; 370 struct linux_dirent64 idb; 371 off_t off; /* true file offset */ 372 int buflen, error, eofflag, nbytes; 373 struct vattr va; 374 off_t *cookiebuf = NULL, *cookie; 375 int ncookies; 376 377 /* getvnode() will use the descriptor for us */ 378 if ((error = getvnode(l->l_proc->p_fd, SCARG(uap, fd), &fp)) != 0) 379 return (error); 380 381 if ((fp->f_flag & FREAD) == 0) { 382 error = EBADF; 383 goto out1; 384 } 385 386 vp = (struct vnode *)fp->f_data; 387 if (vp->v_type != VDIR) { 388 error = EINVAL; 389 goto out1; 390 } 391 392 if ((error = VOP_GETATTR(vp, &va, l->l_cred))) 393 goto out1; 394 395 nbytes = SCARG(uap, count); 396 buflen = min(MAXBSIZE, nbytes); 397 if (buflen < va.va_blocksize) 398 buflen = va.va_blocksize; 399 tbuf = malloc(buflen, M_TEMP, M_WAITOK); 400 401 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 402 off = fp->f_offset; 403 again: 404 aiov.iov_base = tbuf; 405 aiov.iov_len = buflen; 406 auio.uio_iov = &aiov; 407 auio.uio_iovcnt = 1; 408 auio.uio_rw = UIO_READ; 409 auio.uio_resid = buflen; 410 auio.uio_offset = off; 411 UIO_SETUP_SYSSPACE(&auio); 412 /* 413 * First we read into the malloc'ed buffer, then 414 * we massage it into user space, one record at a time. 415 */ 416 error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag, &cookiebuf, 417 &ncookies); 418 if (error) 419 goto out; 420 421 inp = tbuf; 422 outp = (void *)SCARG(uap, dent); 423 resid = nbytes; 424 if ((len = buflen - auio.uio_resid) == 0) 425 goto eof; 426 427 for (cookie = cookiebuf; len > 0; len -= reclen) { 428 bdp = (struct dirent *)inp; 429 reclen = bdp->d_reclen; 430 if (reclen & 3) 431 panic("linux_readdir"); 432 if (bdp->d_fileno == 0) { 433 inp += reclen; /* it is a hole; squish it out */ 434 if (cookie) 435 off = *cookie++; 436 else 437 off += reclen; 438 continue; 439 } 440 linux_reclen = LINUX_RECLEN(&idb, bdp->d_namlen); 441 if (reclen > len || resid < linux_reclen) { 442 /* entry too big for buffer, so just stop */ 443 outp++; 444 break; 445 } 446 if (cookie) 447 off = *cookie++; /* each entry points to next */ 448 else 449 off += reclen; 450 /* 451 * Massage in place to make a Linux-shaped dirent (otherwise 452 * we have to worry about touching user memory outside of 453 * the copyout() call). 454 */ 455 idb.d_ino = bdp->d_fileno; 456 idb.d_type = bdp->d_type; 457 idb.d_off = off; 458 idb.d_reclen = (u_short)linux_reclen; 459 strcpy(idb.d_name, bdp->d_name); 460 if ((error = copyout((void *)&idb, outp, linux_reclen))) 461 goto out; 462 /* advance past this real entry */ 463 inp += reclen; 464 /* advance output past Linux-shaped entry */ 465 outp += linux_reclen; 466 resid -= linux_reclen; 467 } 468 469 /* if we squished out the whole block, try again */ 470 if (outp == (void *)SCARG(uap, dent)) 471 goto again; 472 fp->f_offset = off; /* update the vnode offset */ 473 474 eof: 475 *retval = nbytes - resid; 476 out: 477 VOP_UNLOCK(vp, 0); 478 if (cookiebuf) 479 free(cookiebuf, M_TEMP); 480 free(tbuf, M_TEMP); 481 out1: 482 FILE_UNUSE(fp, l); 483 return error; 484 } 485 #endif /* !COMPAT_LINUX32 */ 486
Indexes created Thu Sep 25 02:09:54 GMT 2025