linux_file64.c revision 1.39
1 /* $NetBSD: linux_file64.c,v 1.39 2007/05/12 23:02:49 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 1.39 2007/05/12 23:02:49 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 linux_flock64 lfl; 302 struct flock bfl; 303 int error; 304 void *arg = SCARG(uap, arg); 305 int cmd = SCARG(uap, cmd); 306 int fd = SCARG(uap, fd); 307 308 switch (cmd) { 309 case LINUX_F_GETLK64: 310 if ((error = copyin(arg, &lfl, sizeof lfl)) != 0) 311 return error; 312 linux_to_bsd_flock64(&bfl, &lfl); 313 error = do_fcntl_lock(l, fd, F_GETLK, &bfl); 314 if (error != 0) 315 return error; 316 bsd_to_linux_flock64(&lfl, &bfl); 317 return copyout(&lfl, arg, sizeof lfl); 318 case LINUX_F_SETLK64: 319 case LINUX_F_SETLKW64: 320 cmd = (cmd == LINUX_F_SETLK64 ? F_SETLK : F_SETLKW); 321 if ((error = copyin(arg, &lfl, sizeof lfl)) != 0) 322 return error; 323 linux_to_bsd_flock64(&bfl, &lfl); 324 return do_fcntl_lock(l, fd, cmd, &bfl); 325 default: 326 return linux_sys_fcntl(l, v, retval); 327 } 328 } 329 # endif /* !m69k && !amd64 && !COMPAT_LINUX32 */ 330 331 #endif /* !alpha */ 332 333 /* 334 * Linux 'readdir' call. This code is mostly taken from the 335 * SunOS getdents call (see compat/sunos/sunos_misc.c), though 336 * an attempt has been made to keep it a little cleaner. 337 * 338 * The d_off field contains the offset of the next valid entry, 339 * unless the older Linux getdents(2), which used to have it set 340 * to the offset of the entry itself. This function also doesn't 341 * need to deal with the old count == 1 glibc problem. 342 * 343 * Read in BSD-style entries, convert them, and copy them out. 344 * 345 * Note that this doesn't handle union-mounted filesystems. 346 */ 347 #ifndef COMPAT_LINUX32 348 int 349 linux_sys_getdents64(l, v, retval) 350 struct lwp *l; 351 void *v; 352 register_t *retval; 353 { 354 struct linux_sys_getdents_args /* { 355 syscallarg(int) fd; 356 syscallarg(struct linux_dirent64 *) dent; 357 syscallarg(unsigned int) count; 358 } */ *uap = v; 359 struct dirent *bdp; 360 struct vnode *vp; 361 char *inp, *tbuf; /* BSD-format */ 362 int len, reclen; /* BSD-format */ 363 char *outp; /* Linux-format */ 364 int resid, linux_reclen = 0; /* Linux-format */ 365 struct file *fp; 366 struct uio auio; 367 struct iovec aiov; 368 struct linux_dirent64 idb; 369 off_t off; /* true file offset */ 370 int buflen, error, eofflag, nbytes; 371 struct vattr va; 372 off_t *cookiebuf = NULL, *cookie; 373 int ncookies; 374 375 /* getvnode() will use the descriptor for us */ 376 if ((error = getvnode(l->l_proc->p_fd, SCARG(uap, fd), &fp)) != 0) 377 return (error); 378 379 if ((fp->f_flag & FREAD) == 0) { 380 error = EBADF; 381 goto out1; 382 } 383 384 vp = (struct vnode *)fp->f_data; 385 if (vp->v_type != VDIR) { 386 error = EINVAL; 387 goto out1; 388 } 389 390 if ((error = VOP_GETATTR(vp, &va, l->l_cred, l))) 391 goto out1; 392 393 nbytes = SCARG(uap, count); 394 buflen = min(MAXBSIZE, nbytes); 395 if (buflen < va.va_blocksize) 396 buflen = va.va_blocksize; 397 tbuf = malloc(buflen, M_TEMP, M_WAITOK); 398 399 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 400 off = fp->f_offset; 401 again: 402 aiov.iov_base = tbuf; 403 aiov.iov_len = buflen; 404 auio.uio_iov = &aiov; 405 auio.uio_iovcnt = 1; 406 auio.uio_rw = UIO_READ; 407 auio.uio_resid = buflen; 408 auio.uio_offset = off; 409 UIO_SETUP_SYSSPACE(&auio); 410 /* 411 * First we read into the malloc'ed buffer, then 412 * we massage it into user space, one record at a time. 413 */ 414 error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag, &cookiebuf, 415 &ncookies); 416 if (error) 417 goto out; 418 419 inp = tbuf; 420 outp = (void *)SCARG(uap, dent); 421 resid = nbytes; 422 if ((len = buflen - auio.uio_resid) == 0) 423 goto eof; 424 425 for (cookie = cookiebuf; len > 0; len -= reclen) { 426 bdp = (struct dirent *)inp; 427 reclen = bdp->d_reclen; 428 if (reclen & 3) 429 panic("linux_readdir"); 430 if (bdp->d_fileno == 0) { 431 inp += reclen; /* it is a hole; squish it out */ 432 if (cookie) 433 off = *cookie++; 434 else 435 off += reclen; 436 continue; 437 } 438 linux_reclen = LINUX_RECLEN(&idb, bdp->d_namlen); 439 if (reclen > len || resid < linux_reclen) { 440 /* entry too big for buffer, so just stop */ 441 outp++; 442 break; 443 } 444 if (cookie) 445 off = *cookie++; /* each entry points to next */ 446 else 447 off += reclen; 448 /* 449 * Massage in place to make a Linux-shaped dirent (otherwise 450 * we have to worry about touching user memory outside of 451 * the copyout() call). 452 */ 453 idb.d_ino = bdp->d_fileno; 454 idb.d_type = bdp->d_type; 455 idb.d_off = off; 456 idb.d_reclen = (u_short)linux_reclen; 457 strcpy(idb.d_name, bdp->d_name); 458 if ((error = copyout((void *)&idb, outp, linux_reclen))) 459 goto out; 460 /* advance past this real entry */ 461 inp += reclen; 462 /* advance output past Linux-shaped entry */ 463 outp += linux_reclen; 464 resid -= linux_reclen; 465 } 466 467 /* if we squished out the whole block, try again */ 468 if (outp == (void *)SCARG(uap, dent)) 469 goto again; 470 fp->f_offset = off; /* update the vnode offset */ 471 472 eof: 473 *retval = nbytes - resid; 474 out: 475 VOP_UNLOCK(vp, 0); 476 if (cookiebuf) 477 free(cookiebuf, M_TEMP); 478 free(tbuf, M_TEMP); 479 out1: 480 FILE_UNUSE(fp, l); 481 return error; 482 } 483 #endif /* !COMPAT_LINUX32 */ 484
Indexes created Thu Sep 25 16:09:42 GMT 2025