linux_file64.c revision 1.15
1 /* $NetBSD: linux_file64.c,v 1.15 2002/05/13 05:41:27 matt 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 1.15 2002/05/13 05:41:27 matt 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 lsp->lst_ino64 = bsp->st_ino; 108 } 109 110 /* 111 * The stat functions below are plain sailing. stat and lstat are handled 112 * by one function to avoid code duplication. 113 */ 114 int 115 linux_sys_fstat64(p, v, retval) 116 struct proc *p; 117 void *v; 118 register_t *retval; 119 { 120 struct linux_sys_fstat64_args /* { 121 syscallarg(int) fd; 122 syscallarg(struct linux_stat64 *) sp; 123 } */ *uap = v; 124 struct sys___fstat13_args fsa; 125 struct linux_stat64 tmplst; 126 struct stat *st,tmpst; 127 caddr_t sg; 128 int error; 129 130 sg = stackgap_init(p, 0); 131 132 st = stackgap_alloc(p, &sg, sizeof (struct stat)); 133 134 SCARG(&fsa, fd) = SCARG(uap, fd); 135 SCARG(&fsa, sb) = st; 136 137 if ((error = sys___fstat13(p, &fsa, retval))) 138 return error; 139 140 if ((error = copyin(st, &tmpst, sizeof tmpst))) 141 return error; 142 143 bsd_to_linux_stat(&tmpst, &tmplst); 144 145 if ((error = copyout(&tmplst, SCARG(uap, sp), sizeof tmplst))) 146 return error; 147 148 return 0; 149 } 150 151 static int 152 linux_do_stat64(p, v, retval, dolstat) 153 struct proc *p; 154 void *v; 155 register_t *retval; 156 int dolstat; 157 { 158 struct sys___stat13_args sa; 159 struct linux_stat64 tmplst; 160 struct stat *st, tmpst; 161 caddr_t sg; 162 int error; 163 struct linux_sys_stat64_args *uap = v; 164 165 sg = stackgap_init(p, 0); 166 st = stackgap_alloc(p, &sg, sizeof (struct stat)); 167 CHECK_ALT_EXIST(p, &sg, SCARG(uap, path)); 168 169 SCARG(&sa, ub) = st; 170 SCARG(&sa, path) = SCARG(uap, path); 171 172 if ((error = (dolstat ? sys___lstat13(p, &sa, retval) : 173 sys___stat13(p, &sa, retval)))) 174 return error; 175 176 if ((error = copyin(st, &tmpst, sizeof tmpst))) 177 return error; 178 179 bsd_to_linux_stat(&tmpst, &tmplst); 180 181 if ((error = copyout(&tmplst, SCARG(uap, sp), sizeof tmplst))) 182 return error; 183 184 return 0; 185 } 186 187 int 188 linux_sys_stat64(p, v, retval) 189 struct proc *p; 190 void *v; 191 register_t *retval; 192 { 193 struct linux_sys_stat64_args /* { 194 syscallarg(const char *) path; 195 syscallarg(struct linux_stat64 *) sp; 196 } */ *uap = v; 197 198 return linux_do_stat64(p, uap, retval, 0); 199 } 200 201 int 202 linux_sys_lstat64(p, v, retval) 203 struct proc *p; 204 void *v; 205 register_t *retval; 206 { 207 struct linux_sys_lstat64_args /* { 208 syscallarg(const char *) path; 209 syscallarg(struct linux_stat64 *) sp; 210 } */ *uap = v; 211 212 return linux_do_stat64(p, uap, retval, 1); 213 } 214 215 int 216 linux_sys_truncate64(p, v, retval) 217 struct proc *p; 218 void *v; 219 register_t *retval; 220 { 221 struct linux_sys_truncate64_args /* { 222 syscallarg(const char *) path; 223 syscallarg(off_t) length; 224 } */ *uap = v; 225 caddr_t sg = stackgap_init(p, 0); 226 227 CHECK_ALT_EXIST(p, &sg, SCARG(uap, path)); 228 229 return sys_truncate(p, uap, retval); 230 } 231 232 #if !defined(__m68k__) 233 static void bsd_to_linux_flock64 __P((struct linux_flock64 *, 234 const struct flock *)); 235 static void linux_to_bsd_flock64 __P((struct flock *, 236 const struct linux_flock64 *)); 237 238 static void 239 bsd_to_linux_flock64(lfp, bfp) 240 struct linux_flock64 *lfp; 241 const struct flock *bfp; 242 { 243 244 lfp->l_start = bfp->l_start; 245 lfp->l_len = bfp->l_len; 246 lfp->l_pid = bfp->l_pid; 247 lfp->l_whence = bfp->l_whence; 248 switch (bfp->l_type) { 249 case F_RDLCK: 250 lfp->l_type = LINUX_F_RDLCK; 251 break; 252 case F_UNLCK: 253 lfp->l_type = LINUX_F_UNLCK; 254 break; 255 case F_WRLCK: 256 lfp->l_type = LINUX_F_WRLCK; 257 break; 258 } 259 } 260 261 static void 262 linux_to_bsd_flock64(bfp, lfp) 263 struct flock *bfp; 264 const struct linux_flock64 *lfp; 265 { 266 267 bfp->l_start = lfp->l_start; 268 bfp->l_len = lfp->l_len; 269 bfp->l_pid = lfp->l_pid; 270 bfp->l_whence = lfp->l_whence; 271 switch (lfp->l_type) { 272 case LINUX_F_RDLCK: 273 bfp->l_type = F_RDLCK; 274 break; 275 case LINUX_F_UNLCK: 276 bfp->l_type = F_UNLCK; 277 break; 278 case LINUX_F_WRLCK: 279 bfp->l_type = F_WRLCK; 280 break; 281 } 282 } 283 284 int 285 linux_sys_fcntl64(p, v, retval) 286 struct proc *p; 287 void *v; 288 register_t *retval; 289 { 290 struct linux_sys_fcntl64_args /* { 291 syscallarg(int) fd; 292 syscallarg(int) cmd; 293 syscallarg(void *) arg; 294 } */ *uap = v; 295 struct sys_fcntl_args fca; 296 struct linux_flock64 lfl; 297 struct flock bfl, *bfp; 298 int error; 299 caddr_t sg; 300 void *arg = SCARG(uap, arg); 301 int cmd = SCARG(uap, cmd); 302 int fd = SCARG(uap, fd); 303 304 switch (cmd) { 305 case LINUX_F_GETLK64: 306 sg = stackgap_init(p, 0); 307 bfp = (struct flock *) stackgap_alloc(p, &sg, sizeof *bfp); 308 if ((error = copyin(arg, &lfl, sizeof lfl)) != 0) 309 return error; 310 linux_to_bsd_flock64(&bfl, &lfl); 311 if ((error = copyout(&bfl, bfp, sizeof bfl)) != 0) 312 return error; 313 SCARG(&fca, fd) = fd; 314 SCARG(&fca, cmd) = F_GETLK; 315 SCARG(&fca, arg) = bfp; 316 if ((error = sys_fcntl(p, &fca, retval)) != 0) 317 return error; 318 if ((error = copyin(bfp, &bfl, sizeof bfl)) != 0) 319 return error; 320 bsd_to_linux_flock64(&lfl, &bfl); 321 return copyout(&lfl, arg, sizeof lfl); 322 case LINUX_F_SETLK64: 323 case LINUX_F_SETLKW64: 324 cmd = (cmd == LINUX_F_SETLK64 ? F_SETLK : F_SETLKW); 325 if ((error = copyin(arg, &lfl, sizeof lfl)) != 0) 326 return error; 327 linux_to_bsd_flock64(&bfl, &lfl); 328 sg = stackgap_init(p, 0); 329 bfp = (struct flock *) stackgap_alloc(p, &sg, sizeof *bfp); 330 if ((error = copyout(&bfl, bfp, sizeof bfl)) != 0) 331 return error; 332 SCARG(&fca, fd) = fd; 333 SCARG(&fca, cmd) = cmd; 334 SCARG(&fca, arg) = bfp; 335 return sys_fcntl(p, &fca, retval); 336 default: 337 return linux_sys_fcntl(p, v, retval); 338 } 339 } 340 #endif /* !m68k */ 341 342 #endif /* !alpha */ 343 344 /* 345 * Linux 'readdir' call. This code is mostly taken from the 346 * SunOS getdents call (see compat/sunos/sunos_misc.c), though 347 * an attempt has been made to keep it a little cleaner (failing 348 * miserably, because of the cruft needed if count 1 is passed). 349 * 350 * The d_off field should contain the offset of the next valid entry, 351 * but in Linux it has the offset of the entry itself. We emulate 352 * that bug here. 353 * 354 * Read in BSD-style entries, convert them, and copy them out. 355 * 356 * Note that this doesn't handle union-mounted filesystems. 357 */ 358 int 359 linux_sys_getdents64(p, v, retval) 360 struct proc *p; 361 void *v; 362 register_t *retval; 363 { 364 struct linux_sys_getdents_args /* { 365 syscallarg(int) fd; 366 syscallarg(struct linux_dirent64 *) dent; 367 syscallarg(unsigned int) count; 368 } */ *uap = v; 369 struct dirent *bdp; 370 struct vnode *vp; 371 caddr_t inp, buf; /* BSD-format */ 372 int len, reclen; /* BSD-format */ 373 caddr_t outp; /* Linux-format */ 374 int resid, linux_reclen = 0; /* Linux-format */ 375 struct file *fp; 376 struct uio auio; 377 struct iovec aiov; 378 struct linux_dirent64 idb; 379 off_t off; /* true file offset */ 380 int buflen, error, eofflag, nbytes, oldcall; 381 struct vattr va; 382 off_t *cookiebuf = NULL, *cookie; 383 int ncookies; 384 385 /* getvnode() will use the descriptor for us */ 386 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 387 return (error); 388 389 if ((fp->f_flag & FREAD) == 0) { 390 error = EBADF; 391 goto out1; 392 } 393 394 vp = (struct vnode *)fp->f_data; 395 if (vp->v_type != VDIR) { 396 error = EINVAL; 397 goto out1; 398 } 399 400 if ((error = VOP_GETATTR(vp, &va, p->p_ucred, p))) 401 goto out1; 402 403 nbytes = SCARG(uap, count); 404 if (nbytes == 1) { /* emulating old, broken behaviour */ 405 nbytes = sizeof (idb); 406 buflen = max(va.va_blocksize, nbytes); 407 oldcall = 1; 408 } else { 409 buflen = min(MAXBSIZE, nbytes); 410 if (buflen < va.va_blocksize) 411 buflen = va.va_blocksize; 412 oldcall = 0; 413 } 414 buf = malloc(buflen, M_TEMP, M_WAITOK); 415 416 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 417 off = fp->f_offset; 418 again: 419 aiov.iov_base = buf; 420 aiov.iov_len = buflen; 421 auio.uio_iov = &aiov; 422 auio.uio_iovcnt = 1; 423 auio.uio_rw = UIO_READ; 424 auio.uio_segflg = UIO_SYSSPACE; 425 auio.uio_procp = p; 426 auio.uio_resid = buflen; 427 auio.uio_offset = off; 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 = buf; 438 outp = (caddr_t)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 off = *cookie++; 451 continue; 452 } 453 linux_reclen = LINUX_RECLEN(&idb, bdp->d_namlen); 454 if (reclen > len || resid < linux_reclen) { 455 /* entry too big for buffer, so just stop */ 456 outp++; 457 break; 458 } 459 /* 460 * Massage in place to make a Linux-shaped dirent (otherwise 461 * we have to worry about touching user memory outside of 462 * the copyout() call). 463 */ 464 idb.d_ino = bdp->d_fileno; 465 idb.d_type = bdp->d_type; 466 /* 467 * The old readdir() call misuses the offset and reclen fields. 468 */ 469 if (oldcall) { 470 idb.d_off = linux_reclen; 471 idb.d_reclen = (u_short)bdp->d_namlen; 472 } else { 473 idb.d_off = off; 474 idb.d_reclen = (u_short)linux_reclen; 475 } 476 strcpy(idb.d_name, bdp->d_name); 477 if ((error = copyout((caddr_t)&idb, outp, linux_reclen))) 478 goto out; 479 /* advance past this real entry */ 480 inp += reclen; 481 off = *cookie++; /* each entry points to itself */ 482 /* advance output past Linux-shaped entry */ 483 outp += linux_reclen; 484 resid -= linux_reclen; 485 if (oldcall) 486 break; 487 } 488 489 /* if we squished out the whole block, try again */ 490 if (outp == (caddr_t)SCARG(uap, dent)) 491 goto again; 492 fp->f_offset = off; /* update the vnode offset */ 493 494 if (oldcall) 495 nbytes = resid + linux_reclen; 496 497 eof: 498 *retval = nbytes - resid; 499 out: 500 VOP_UNLOCK(vp, 0); 501 if (cookiebuf) 502 free(cookiebuf, M_TEMP); 503 free(buf, M_TEMP); 504 out1: 505 FILE_UNUSE(fp, p); 506 return error; 507 } 508
Indexes created Thu Sep 25 02:09:54 GMT 2025