Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/compat/linux/linux_stats.c
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1 /*- 2 * Copyright (c) 1994-1995 Søren Schmidt 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer 10 * in this position and unchanged. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. The name of the author may not be used to endorse or promote products 15 * derived from this software without specific prior written permission 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 __FBSDID("$FreeBSD: releng/6.4/sys/compat/linux/linux_stats.c 175187 2008-01-09 16:07:32Z kib $"); 31 32 #include "opt_compat.h" 33 #include "opt_mac.h" 34 35 #include <sys/param.h> 36 #include <sys/dirent.h> 37 #include <sys/file.h> 38 #include <sys/filedesc.h> 39 #include <sys/proc.h> 40 #include <sys/jail.h> 41 #include <sys/mac.h> 42 #include <sys/malloc.h> 43 #include <sys/mount.h> 44 #include <sys/namei.h> 45 #include <sys/stat.h> 46 #include <sys/syscallsubr.h> 47 #include <sys/systm.h> 48 #include <sys/vnode.h> 49 #include <sys/conf.h> 50 #include <sys/fcntl.h> 51 52 #ifdef COMPAT_LINUX32 53 #include <machine/../linux32/linux.h> 54 #include <machine/../linux32/linux32_proto.h> 55 #else 56 #include <machine/../linux/linux.h> 57 #include <machine/../linux/linux_proto.h> 58 #endif 59 60 #include <compat/linux/linux_util.h> 61 62 /* 63 * XXX: This was removed from newstat_copyout(), and almost identical 64 * XXX: code was in stat64_copyout(). findcdev() needs to be replaced 65 * XXX: with something that does lookup and locking properly. 66 * XXX: When somebody fixes this: please try to avoid duplicating it. 67 */ 68 #if 0 69 static void 70 disk_foo(struct somestat *tbuf) 71 { 72 struct cdevsw *cdevsw; 73 struct cdev *dev; 74 75 /* Lie about disk drives which are character devices 76 * in FreeBSD but block devices under Linux. 77 */ 78 if (S_ISCHR(tbuf.st_mode) && 79 (dev = findcdev(buf->st_rdev)) != NULL) { 80 cdevsw = dev_refthread(dev); 81 if (cdevsw != NULL) { 82 if (cdevsw->d_flags & D_DISK) { 83 tbuf.st_mode &= ~S_IFMT; 84 tbuf.st_mode |= S_IFBLK; 85 86 /* XXX this may not be quite right */ 87 /* Map major number to 0 */ 88 tbuf.st_dev = uminor(buf->st_dev) & 0xf; 89 tbuf.st_rdev = buf->st_rdev & 0xff; 90 } 91 dev_relthread(dev); 92 } 93 } 94 95 } 96 #endif 97 98 static void 99 translate_fd_major_minor(struct thread *td, int fd, struct stat *buf) 100 { 101 struct file *fp; 102 int error; 103 int major, minor; 104 105 if ((error = fget(td, fd, &fp)) != 0) 106 return; 107 if (fp->f_vnode) { 108 if (fp->f_vnode->v_type == VCHR 109 || fp->f_vnode->v_type == VBLK) { 110 if (fp->f_vnode->v_un.vu_cdev) { 111 if (linux_driver_get_major_minor( 112 fp->f_vnode->v_un.vu_cdev->si_name, 113 &major, &minor) == 0) { 114 buf->st_rdev = (major << 8 | minor); 115 } 116 } 117 } 118 } 119 fdrop(fp, td); 120 } 121 122 static void 123 translate_path_major_minor(struct thread *td, char *path, struct stat *buf) 124 { 125 struct proc *p = td->td_proc; 126 struct filedesc *fdp = p->p_fd; 127 struct file *fp; 128 int fd; 129 int temp; 130 131 temp = td->td_retval[0]; 132 if (kern_open(td, path, UIO_SYSSPACE, O_RDONLY, 0) != 0) 133 return; 134 fd = td->td_retval[0]; 135 td->td_retval[0] = temp; 136 translate_fd_major_minor(td, fd, buf); 137 FILEDESC_LOCK(fdp); 138 fp = fdp->fd_ofiles[fd]; 139 FILEDESC_UNLOCK(fdp); 140 fdclose(fdp, fdp->fd_ofiles[fd], fd, td); 141 } 142 143 static int 144 newstat_copyout(struct stat *buf, void *ubuf) 145 { 146 struct l_newstat tbuf; 147 148 bzero(&tbuf, sizeof(tbuf)); 149 tbuf.st_dev = uminor(buf->st_dev) | (umajor(buf->st_dev) << 8); 150 tbuf.st_ino = buf->st_ino; 151 tbuf.st_mode = buf->st_mode; 152 tbuf.st_nlink = buf->st_nlink; 153 tbuf.st_uid = buf->st_uid; 154 tbuf.st_gid = buf->st_gid; 155 tbuf.st_rdev = buf->st_rdev; 156 tbuf.st_size = buf->st_size; 157 tbuf.st_atime = buf->st_atime; 158 tbuf.st_mtime = buf->st_mtime; 159 tbuf.st_ctime = buf->st_ctime; 160 tbuf.st_blksize = buf->st_blksize; 161 tbuf.st_blocks = buf->st_blocks; 162 163 return (copyout(&tbuf, ubuf, sizeof(tbuf))); 164 } 165 166 int 167 linux_newstat(struct thread *td, struct linux_newstat_args *args) 168 { 169 struct stat buf; 170 char *path; 171 int error; 172 173 LCONVPATHEXIST(td, args->path, &path); 174 175 #ifdef DEBUG 176 if (ldebug(newstat)) 177 printf(ARGS(newstat, "%s, *"), path); 178 #endif 179 180 error = kern_stat(td, path, UIO_SYSSPACE, &buf); 181 if (!error && strlen(path) > strlen("/dev/pts/") && 182 !strncmp(path, "/dev/pts/", strlen("/dev/pts/")) 183 && path[9] >= '' && path[9] <= '9') { 184 /* 185 * Linux checks major and minors of the slave device to make 186 * sure it's a pty device, so let's make him believe it is. 187 */ 188 buf.st_rdev = (136 << 8); 189 } 190 191 translate_path_major_minor(td, path, &buf); 192 193 LFREEPATH(path); 194 if (error) 195 return (error); 196 return (newstat_copyout(&buf, args->buf)); 197 } 198 199 int 200 linux_newlstat(struct thread *td, struct linux_newlstat_args *args) 201 { 202 struct stat sb; 203 char *path; 204 int error; 205 206 LCONVPATHEXIST(td, args->path, &path); 207 208 #ifdef DEBUG 209 if (ldebug(newlstat)) 210 printf(ARGS(newlstat, "%s, *"), path); 211 #endif 212 213 error = kern_lstat(td, path, UIO_SYSSPACE, &sb); 214 if (!error) 215 translate_path_major_minor(td, path, &sb); 216 LFREEPATH(path); 217 if (error) 218 return (error); 219 return (newstat_copyout(&sb, args->buf)); 220 } 221 222 int 223 linux_newfstat(struct thread *td, struct linux_newfstat_args *args) 224 { 225 struct stat buf; 226 int error; 227 228 #ifdef DEBUG 229 if (ldebug(newfstat)) 230 printf(ARGS(newfstat, "%d, *"), args->fd); 231 #endif 232 233 error = kern_fstat(td, args->fd, &buf); 234 translate_fd_major_minor(td, args->fd, &buf); 235 if (!error) 236 error = newstat_copyout(&buf, args->buf); 237 238 return (error); 239 } 240 241 static int 242 stat_copyout(struct stat *buf, void *ubuf) 243 { 244 struct l_stat lbuf; 245 246 bzero(&lbuf, sizeof(lbuf)); 247 lbuf.st_dev = buf->st_dev; 248 lbuf.st_ino = buf->st_ino; 249 lbuf.st_mode = buf->st_mode; 250 lbuf.st_nlink = buf->st_nlink; 251 lbuf.st_uid = buf->st_uid; 252 lbuf.st_gid = buf->st_gid; 253 lbuf.st_rdev = buf->st_rdev; 254 if (buf->st_size < (quad_t)1 << 32) 255 lbuf.st_size = buf->st_size; 256 else 257 lbuf.st_size = -2; 258 lbuf.st_atime = buf->st_atime; 259 lbuf.st_mtime = buf->st_mtime; 260 lbuf.st_ctime = buf->st_ctime; 261 lbuf.st_blksize = buf->st_blksize; 262 lbuf.st_blocks = buf->st_blocks; 263 lbuf.st_flags = buf->st_flags; 264 lbuf.st_gen = buf->st_gen; 265 266 return (copyout(&lbuf, ubuf, sizeof(lbuf))); 267 } 268 269 int 270 linux_stat(struct thread *td, struct linux_stat_args *args) 271 { 272 struct stat buf; 273 char *path; 274 int error; 275 276 LCONVPATHEXIST(td, args->path, &path); 277 278 #ifdef DEBUG 279 if (ldebug(stat)) 280 printf(ARGS(stat, "%s, *"), path); 281 #endif 282 error = kern_stat(td, path, UIO_SYSSPACE, &buf); 283 if (error) { 284 LFREEPATH(path); 285 return (error); 286 } 287 translate_path_major_minor(td, path, &buf); 288 LFREEPATH(path); 289 return(stat_copyout(&buf, args->up)); 290 } 291 292 int 293 linux_lstat(struct thread *td, struct linux_lstat_args *args) 294 { 295 struct stat buf; 296 char *path; 297 int error; 298 299 LCONVPATHEXIST(td, args->path, &path); 300 301 #ifdef DEBUG 302 if (ldebug(lstat)) 303 printf(ARGS(lstat, "%s, *"), path); 304 #endif 305 error = kern_lstat(td, path, UIO_SYSSPACE, &buf); 306 if (error) { 307 LFREEPATH(path); 308 return (error); 309 } 310 translate_path_major_minor(td, path, &buf); 311 LFREEPATH(path); 312 return(stat_copyout(&buf, args->up)); 313 } 314 315 /* XXX - All fields of type l_int are defined as l_long on i386 */ 316 struct l_statfs { 317 l_int f_type; 318 l_int f_bsize; 319 l_int f_blocks; 320 l_int f_bfree; 321 l_int f_bavail; 322 l_int f_files; 323 l_int f_ffree; 324 l_fsid_t f_fsid; 325 l_int f_namelen; 326 l_int f_spare[6]; 327 }; 328 329 #define LINUX_CODA_SUPER_MAGIC 0x73757245L 330 #define LINUX_EXT2_SUPER_MAGIC 0xEF53L 331 #define LINUX_HPFS_SUPER_MAGIC 0xf995e849L 332 #define LINUX_ISOFS_SUPER_MAGIC 0x9660L 333 #define LINUX_MSDOS_SUPER_MAGIC 0x4d44L 334 #define LINUX_NCP_SUPER_MAGIC 0x564cL 335 #define LINUX_NFS_SUPER_MAGIC 0x6969L 336 #define LINUX_NTFS_SUPER_MAGIC 0x5346544EL 337 #define LINUX_PROC_SUPER_MAGIC 0x9fa0L 338 #define LINUX_UFS_SUPER_MAGIC 0x00011954L /* XXX - UFS_MAGIC in Linux */ 339 #define LINUX_DEVFS_SUPER_MAGIC 0x1373L 340 341 static long 342 bsd_to_linux_ftype(const char *fstypename) 343 { 344 int i; 345 static struct {const char *bsd_name; long linux_type;} b2l_tbl[] = { 346 {"ufs", LINUX_UFS_SUPER_MAGIC}, 347 {"cd9660", LINUX_ISOFS_SUPER_MAGIC}, 348 {"nfs", LINUX_NFS_SUPER_MAGIC}, 349 {"ext2fs", LINUX_EXT2_SUPER_MAGIC}, 350 {"procfs", LINUX_PROC_SUPER_MAGIC}, 351 {"msdosfs", LINUX_MSDOS_SUPER_MAGIC}, 352 {"ntfs", LINUX_NTFS_SUPER_MAGIC}, 353 {"nwfs", LINUX_NCP_SUPER_MAGIC}, 354 {"hpfs", LINUX_HPFS_SUPER_MAGIC}, 355 {"coda", LINUX_CODA_SUPER_MAGIC}, 356 {"devfs", LINUX_DEVFS_SUPER_MAGIC}, 357 {NULL, 0L}}; 358 359 for (i = 0; b2l_tbl[i].bsd_name != NULL; i++) 360 if (strcmp(b2l_tbl[i].bsd_name, fstypename) == 0) 361 return (b2l_tbl[i].linux_type); 362 363 return (0L); 364 } 365 366 static void 367 bsd_to_linux_statfs(struct statfs *bsd_statfs, struct l_statfs *linux_statfs) 368 { 369 370 linux_statfs->f_type = bsd_to_linux_ftype(bsd_statfs->f_fstypename); 371 linux_statfs->f_bsize = bsd_statfs->f_bsize; 372 linux_statfs->f_blocks = bsd_statfs->f_blocks; 373 linux_statfs->f_bfree = bsd_statfs->f_bfree; 374 linux_statfs->f_bavail = bsd_statfs->f_bavail; 375 linux_statfs->f_ffree = bsd_statfs->f_ffree; 376 linux_statfs->f_files = bsd_statfs->f_files; 377 linux_statfs->f_fsid.val[0] = bsd_statfs->f_fsid.val[0]; 378 linux_statfs->f_fsid.val[1] = bsd_statfs->f_fsid.val[1]; 379 linux_statfs->f_namelen = MAXNAMLEN; 380 } 381 382 int 383 linux_statfs(struct thread *td, struct linux_statfs_args *args) 384 { 385 struct l_statfs linux_statfs; 386 struct statfs bsd_statfs; 387 char *path; 388 int error; 389 390 LCONVPATHEXIST(td, args->path, &path); 391 392 #ifdef DEBUG 393 if (ldebug(statfs)) 394 printf(ARGS(statfs, "%s, *"), path); 395 #endif 396 error = kern_statfs(td, path, UIO_SYSSPACE, &bsd_statfs); 397 LFREEPATH(path); 398 if (error) 399 return (error); 400 bsd_to_linux_statfs(&bsd_statfs, &linux_statfs); 401 return copyout(&linux_statfs, args->buf, sizeof(linux_statfs)); 402 } 403 404 static void 405 bsd_to_linux_statfs64(struct statfs *bsd_statfs, struct l_statfs64 *linux_statfs) 406 { 407 408 linux_statfs->f_type = bsd_to_linux_ftype(bsd_statfs->f_fstypename); 409 linux_statfs->f_bsize = bsd_statfs->f_bsize; 410 linux_statfs->f_blocks = bsd_statfs->f_blocks; 411 linux_statfs->f_bfree = bsd_statfs->f_bfree; 412 linux_statfs->f_bavail = bsd_statfs->f_bavail; 413 linux_statfs->f_ffree = bsd_statfs->f_ffree; 414 linux_statfs->f_files = bsd_statfs->f_files; 415 linux_statfs->f_fsid.val[0] = bsd_statfs->f_fsid.val[0]; 416 linux_statfs->f_fsid.val[1] = bsd_statfs->f_fsid.val[1]; 417 linux_statfs->f_namelen = MAXNAMLEN; 418 } 419 420 int 421 linux_statfs64(struct thread *td, struct linux_statfs64_args *args) 422 { 423 struct l_statfs64 linux_statfs; 424 struct statfs bsd_statfs; 425 char *path; 426 int error; 427 428 if (args->bufsize != sizeof(struct l_statfs64)) 429 return EINVAL; 430 431 LCONVPATHEXIST(td, args->path, &path); 432 433 #ifdef DEBUG 434 if (ldebug(statfs64)) 435 printf(ARGS(statfs64, "%s, *"), path); 436 #endif 437 error = kern_statfs(td, path, UIO_SYSSPACE, &bsd_statfs); 438 LFREEPATH(path); 439 if (error) 440 return (error); 441 bsd_to_linux_statfs64(&bsd_statfs, &linux_statfs); 442 return copyout(&linux_statfs, args->buf, sizeof(linux_statfs)); 443 } 444 445 int 446 linux_fstatfs(struct thread *td, struct linux_fstatfs_args *args) 447 { 448 struct l_statfs linux_statfs; 449 struct statfs bsd_statfs; 450 int error; 451 452 #ifdef DEBUG 453 if (ldebug(fstatfs)) 454 printf(ARGS(fstatfs, "%d, *"), args->fd); 455 #endif 456 error = kern_fstatfs(td, args->fd, &bsd_statfs); 457 if (error) 458 return error; 459 bsd_to_linux_statfs(&bsd_statfs, &linux_statfs); 460 return copyout(&linux_statfs, args->buf, sizeof(linux_statfs)); 461 } 462 463 struct l_ustat 464 { 465 l_daddr_t f_tfree; 466 l_ino_t f_tinode; 467 char f_fname[6]; 468 char f_fpack[6]; 469 }; 470 471 int 472 linux_ustat(struct thread *td, struct linux_ustat_args *args) 473 { 474 #ifdef DEBUG 475 if (ldebug(ustat)) 476 printf(ARGS(ustat, "%d, *"), args->dev); 477 #endif 478 479 return (EOPNOTSUPP); 480 } 481 482 #if defined(__i386__) || (defined(__amd64__) && defined(COMPAT_LINUX32)) 483 484 static int 485 stat64_copyout(struct stat *buf, void *ubuf) 486 { 487 struct l_stat64 lbuf; 488 489 bzero(&lbuf, sizeof(lbuf)); 490 lbuf.st_dev = uminor(buf->st_dev) | (umajor(buf->st_dev) << 8); 491 lbuf.st_ino = buf->st_ino; 492 lbuf.st_mode = buf->st_mode; 493 lbuf.st_nlink = buf->st_nlink; 494 lbuf.st_uid = buf->st_uid; 495 lbuf.st_gid = buf->st_gid; 496 lbuf.st_rdev = buf->st_rdev; 497 lbuf.st_size = buf->st_size; 498 lbuf.st_atime = buf->st_atime; 499 lbuf.st_mtime = buf->st_mtime; 500 lbuf.st_ctime = buf->st_ctime; 501 lbuf.st_blksize = buf->st_blksize; 502 lbuf.st_blocks = buf->st_blocks; 503 504 /* 505 * The __st_ino field makes all the difference. In the Linux kernel 506 * it is conditionally compiled based on STAT64_HAS_BROKEN_ST_INO, 507 * but without the assignment to __st_ino the runtime linker refuses 508 * to mmap(2) any shared libraries. I guess it's broken alright :-) 509 */ 510 lbuf.__st_ino = buf->st_ino; 511 512 return (copyout(&lbuf, ubuf, sizeof(lbuf))); 513 } 514 515 int 516 linux_stat64(struct thread *td, struct linux_stat64_args *args) 517 { 518 struct stat buf; 519 char *filename; 520 int error; 521 522 LCONVPATHEXIST(td, args->filename, &filename); 523 524 #ifdef DEBUG 525 if (ldebug(stat64)) 526 printf(ARGS(stat64, "%s, *"), filename); 527 #endif 528 529 error = kern_stat(td, filename, UIO_SYSSPACE, &buf); 530 if (!error) { 531 if (strlen(filename) > strlen("/dev/pts/") && 532 !strncmp(filename, "/dev/pts/", strlen("/dev/pts/")) && 533 filename[9] >= '' && filename[9] <= '9') { 534 /* 535 * Linux checks major and minors of the slave device 536 * to make sure it's a pty deivce, so let's make him 537 * believe it is. 538 */ 539 buf.st_rdev = (136 << 8); 540 } else 541 translate_path_major_minor(td, filename, &buf); 542 } 543 LFREEPATH(filename); 544 if (error) 545 return (error); 546 return (stat64_copyout(&buf, args->statbuf)); 547 } 548 549 int 550 linux_lstat64(struct thread *td, struct linux_lstat64_args *args) 551 { 552 struct stat sb; 553 char *filename; 554 int error; 555 556 LCONVPATHEXIST(td, args->filename, &filename); 557 558 #ifdef DEBUG 559 if (ldebug(lstat64)) 560 printf(ARGS(lstat64, "%s, *"), args->filename); 561 #endif 562 563 error = kern_lstat(td, filename, UIO_SYSSPACE, &sb); 564 if (!error) 565 translate_path_major_minor(td, filename, &sb); 566 LFREEPATH(filename); 567 if (error) 568 return (error); 569 return (stat64_copyout(&sb, args->statbuf)); 570 } 571 572 int 573 linux_fstat64(struct thread *td, struct linux_fstat64_args *args) 574 { 575 struct stat buf; 576 int error; 577 578 #ifdef DEBUG 579 if (ldebug(fstat64)) 580 printf(ARGS(fstat64, "%d, *"), args->fd); 581 #endif 582 583 error = kern_fstat(td, args->fd, &buf); 584 translate_fd_major_minor(td, args->fd, &buf); 585 if (!error) 586 error = stat64_copyout(&buf, args->statbuf); 587 588 return (error); 589 } 590 591 #endif /* __i386__ || (__amd64__ && COMPAT_LINUX32) */
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