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("$FreeBSD$"); 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 major, minor; 103 104 if ((!S_ISCHR(buf->st_mode) && !S_ISBLK(buf->st_mode)) || 105 fget(td, fd, &fp) != 0) 106 return; 107 if (fp->f_vnode != NULL && 108 fp->f_vnode->v_un.vu_cdev != NULL && 109 linux_driver_get_major_minor(fp->f_vnode->v_un.vu_cdev->si_name, 110 &major, &minor) == 0) 111 buf->st_rdev = (major << 8 | minor); 112 fdrop(fp, td); 113 } 114 115 static void 116 translate_path_major_minor(struct thread *td, char *path, struct stat *buf) 117 { 118 struct proc *p = td->td_proc; 119 struct filedesc *fdp = p->p_fd; 120 struct file *fp; 121 int fd; 122 int temp; 123 124 if (!S_ISCHR(buf->st_mode) && !S_ISBLK(buf->st_mode)) 125 return; 126 temp = td->td_retval[0]; 127 if (kern_open(td, path, UIO_SYSSPACE, O_RDONLY, 0) != 0) 128 return; 129 fd = td->td_retval[0]; 130 td->td_retval[0] = temp; 131 translate_fd_major_minor(td, fd, buf); 132 FILEDESC_LOCK(fdp); 133 fp = fdp->fd_ofiles[fd]; 134 FILEDESC_UNLOCK(fdp); 135 fdclose(fdp, fdp->fd_ofiles[fd], fd, td); 136 } 137 138 static int 139 newstat_copyout(struct stat *buf, void *ubuf) 140 { 141 struct l_newstat tbuf; 142 143 bzero(&tbuf, sizeof(tbuf)); 144 tbuf.st_dev = uminor(buf->st_dev) | (umajor(buf->st_dev) << 8); 145 tbuf.st_ino = buf->st_ino; 146 tbuf.st_mode = buf->st_mode; 147 tbuf.st_nlink = buf->st_nlink; 148 tbuf.st_uid = buf->st_uid; 149 tbuf.st_gid = buf->st_gid; 150 tbuf.st_rdev = buf->st_rdev; 151 tbuf.st_size = buf->st_size; 152 tbuf.st_atime = buf->st_atime; 153 tbuf.st_mtime = buf->st_mtime; 154 tbuf.st_ctime = buf->st_ctime; 155 tbuf.st_blksize = buf->st_blksize; 156 tbuf.st_blocks = buf->st_blocks; 157 158 return (copyout(&tbuf, ubuf, sizeof(tbuf))); 159 } 160 161 int 162 linux_newstat(struct thread *td, struct linux_newstat_args *args) 163 { 164 struct stat buf; 165 char *path; 166 int error; 167 168 LCONVPATHEXIST(td, args->path, &path); 169 170 #ifdef DEBUG 171 if (ldebug(newstat)) 172 printf(ARGS(newstat, "%s, *"), path); 173 #endif 174 175 error = kern_stat(td, path, UIO_SYSSPACE, &buf); 176 if (!error) { 177 if (strlen(path) > strlen("/dev/pts/") && 178 !strncmp(path, "/dev/pts/", strlen("/dev/pts/")) && 179 path[9] >= '' && path[9] <= '9') { 180 /* 181 * Linux checks major and minors of the slave device 182 * to make sure it's a pty device, so let's make him 183 * believe it is. 184 */ 185 buf.st_rdev = (136 << 8); 186 } else 187 translate_path_major_minor(td, path, &buf); 188 } 189 LFREEPATH(path); 190 if (error) 191 return (error); 192 return (newstat_copyout(&buf, args->buf)); 193 } 194 195 int 196 linux_newlstat(struct thread *td, struct linux_newlstat_args *args) 197 { 198 struct stat sb; 199 char *path; 200 int error; 201 202 LCONVPATHEXIST(td, args->path, &path); 203 204 #ifdef DEBUG 205 if (ldebug(newlstat)) 206 printf(ARGS(newlstat, "%s, *"), path); 207 #endif 208 209 error = kern_lstat(td, path, UIO_SYSSPACE, &sb); 210 if (!error) 211 translate_path_major_minor(td, path, &sb); 212 LFREEPATH(path); 213 if (error) 214 return (error); 215 return (newstat_copyout(&sb, args->buf)); 216 } 217 218 int 219 linux_newfstat(struct thread *td, struct linux_newfstat_args *args) 220 { 221 struct stat buf; 222 int error; 223 224 #ifdef DEBUG 225 if (ldebug(newfstat)) 226 printf(ARGS(newfstat, "%d, *"), args->fd); 227 #endif 228 229 error = kern_fstat(td, args->fd, &buf); 230 translate_fd_major_minor(td, args->fd, &buf); 231 if (!error) 232 error = newstat_copyout(&buf, args->buf); 233 234 return (error); 235 } 236 237 static int 238 stat_copyout(struct stat *buf, void *ubuf) 239 { 240 struct l_stat lbuf; 241 242 bzero(&lbuf, sizeof(lbuf)); 243 lbuf.st_dev = buf->st_dev; 244 lbuf.st_ino = buf->st_ino; 245 lbuf.st_mode = buf->st_mode; 246 lbuf.st_nlink = buf->st_nlink; 247 lbuf.st_uid = buf->st_uid; 248 lbuf.st_gid = buf->st_gid; 249 lbuf.st_rdev = buf->st_rdev; 250 if (buf->st_size < (quad_t)1 << 32) 251 lbuf.st_size = buf->st_size; 252 else 253 lbuf.st_size = -2; 254 lbuf.st_atime = buf->st_atime; 255 lbuf.st_mtime = buf->st_mtime; 256 lbuf.st_ctime = buf->st_ctime; 257 lbuf.st_blksize = buf->st_blksize; 258 lbuf.st_blocks = buf->st_blocks; 259 lbuf.st_flags = buf->st_flags; 260 lbuf.st_gen = buf->st_gen; 261 262 return (copyout(&lbuf, ubuf, sizeof(lbuf))); 263 } 264 265 int 266 linux_stat(struct thread *td, struct linux_stat_args *args) 267 { 268 struct stat buf; 269 char *path; 270 int error; 271 272 LCONVPATHEXIST(td, args->path, &path); 273 274 #ifdef DEBUG 275 if (ldebug(stat)) 276 printf(ARGS(stat, "%s, *"), path); 277 #endif 278 error = kern_stat(td, path, UIO_SYSSPACE, &buf); 279 if (error) { 280 LFREEPATH(path); 281 return (error); 282 } 283 translate_path_major_minor(td, path, &buf); 284 LFREEPATH(path); 285 return(stat_copyout(&buf, args->up)); 286 } 287 288 int 289 linux_lstat(struct thread *td, struct linux_lstat_args *args) 290 { 291 struct stat buf; 292 char *path; 293 int error; 294 295 LCONVPATHEXIST(td, args->path, &path); 296 297 #ifdef DEBUG 298 if (ldebug(lstat)) 299 printf(ARGS(lstat, "%s, *"), path); 300 #endif 301 error = kern_lstat(td, path, UIO_SYSSPACE, &buf); 302 if (error) { 303 LFREEPATH(path); 304 return (error); 305 } 306 translate_path_major_minor(td, path, &buf); 307 LFREEPATH(path); 308 return(stat_copyout(&buf, args->up)); 309 } 310 311 /* XXX - All fields of type l_int are defined as l_long on i386 */ 312 struct l_statfs { 313 l_int f_type; 314 l_int f_bsize; 315 l_int f_blocks; 316 l_int f_bfree; 317 l_int f_bavail; 318 l_int f_files; 319 l_int f_ffree; 320 l_fsid_t f_fsid; 321 l_int f_namelen; 322 l_int f_spare[6]; 323 }; 324 325 #define LINUX_CODA_SUPER_MAGIC 0x73757245L 326 #define LINUX_EXT2_SUPER_MAGIC 0xEF53L 327 #define LINUX_HPFS_SUPER_MAGIC 0xf995e849L 328 #define LINUX_ISOFS_SUPER_MAGIC 0x9660L 329 #define LINUX_MSDOS_SUPER_MAGIC 0x4d44L 330 #define LINUX_NCP_SUPER_MAGIC 0x564cL 331 #define LINUX_NFS_SUPER_MAGIC 0x6969L 332 #define LINUX_NTFS_SUPER_MAGIC 0x5346544EL 333 #define LINUX_PROC_SUPER_MAGIC 0x9fa0L 334 #define LINUX_UFS_SUPER_MAGIC 0x00011954L /* XXX - UFS_MAGIC in Linux */ 335 #define LINUX_DEVFS_SUPER_MAGIC 0x1373L 336 337 static long 338 bsd_to_linux_ftype(const char *fstypename) 339 { 340 int i; 341 static struct {const char *bsd_name; long linux_type;} b2l_tbl[] = { 342 {"ufs", LINUX_UFS_SUPER_MAGIC}, 343 {"cd9660", LINUX_ISOFS_SUPER_MAGIC}, 344 {"nfs", LINUX_NFS_SUPER_MAGIC}, 345 {"ext2fs", LINUX_EXT2_SUPER_MAGIC}, 346 {"procfs", LINUX_PROC_SUPER_MAGIC}, 347 {"msdosfs", LINUX_MSDOS_SUPER_MAGIC}, 348 {"ntfs", LINUX_NTFS_SUPER_MAGIC}, 349 {"nwfs", LINUX_NCP_SUPER_MAGIC}, 350 {"hpfs", LINUX_HPFS_SUPER_MAGIC}, 351 {"coda", LINUX_CODA_SUPER_MAGIC}, 352 {"devfs", LINUX_DEVFS_SUPER_MAGIC}, 353 {NULL, 0L}}; 354 355 for (i = 0; b2l_tbl[i].bsd_name != NULL; i++) 356 if (strcmp(b2l_tbl[i].bsd_name, fstypename) == 0) 357 return (b2l_tbl[i].linux_type); 358 359 return (0L); 360 } 361 362 static void 363 bsd_to_linux_statfs(struct statfs *bsd_statfs, struct l_statfs *linux_statfs) 364 { 365 366 linux_statfs->f_type = bsd_to_linux_ftype(bsd_statfs->f_fstypename); 367 linux_statfs->f_bsize = bsd_statfs->f_bsize; 368 linux_statfs->f_blocks = bsd_statfs->f_blocks; 369 linux_statfs->f_bfree = bsd_statfs->f_bfree; 370 linux_statfs->f_bavail = bsd_statfs->f_bavail; 371 linux_statfs->f_ffree = bsd_statfs->f_ffree; 372 linux_statfs->f_files = bsd_statfs->f_files; 373 linux_statfs->f_fsid.val[0] = bsd_statfs->f_fsid.val[0]; 374 linux_statfs->f_fsid.val[1] = bsd_statfs->f_fsid.val[1]; 375 linux_statfs->f_namelen = MAXNAMLEN; 376 } 377 378 int 379 linux_statfs(struct thread *td, struct linux_statfs_args *args) 380 { 381 struct l_statfs linux_statfs; 382 struct statfs bsd_statfs; 383 char *path; 384 int error; 385 386 LCONVPATHEXIST(td, args->path, &path); 387 388 #ifdef DEBUG 389 if (ldebug(statfs)) 390 printf(ARGS(statfs, "%s, *"), path); 391 #endif 392 error = kern_statfs(td, path, UIO_SYSSPACE, &bsd_statfs); 393 LFREEPATH(path); 394 if (error) 395 return (error); 396 bsd_to_linux_statfs(&bsd_statfs, &linux_statfs); 397 return copyout(&linux_statfs, args->buf, sizeof(linux_statfs)); 398 } 399 400 static void 401 bsd_to_linux_statfs64(struct statfs *bsd_statfs, struct l_statfs64 *linux_statfs) 402 { 403 404 linux_statfs->f_type = bsd_to_linux_ftype(bsd_statfs->f_fstypename); 405 linux_statfs->f_bsize = bsd_statfs->f_bsize; 406 linux_statfs->f_blocks = bsd_statfs->f_blocks; 407 linux_statfs->f_bfree = bsd_statfs->f_bfree; 408 linux_statfs->f_bavail = bsd_statfs->f_bavail; 409 linux_statfs->f_ffree = bsd_statfs->f_ffree; 410 linux_statfs->f_files = bsd_statfs->f_files; 411 linux_statfs->f_fsid.val[0] = bsd_statfs->f_fsid.val[0]; 412 linux_statfs->f_fsid.val[1] = bsd_statfs->f_fsid.val[1]; 413 linux_statfs->f_namelen = MAXNAMLEN; 414 } 415 416 int 417 linux_statfs64(struct thread *td, struct linux_statfs64_args *args) 418 { 419 struct l_statfs64 linux_statfs; 420 struct statfs bsd_statfs; 421 char *path; 422 int error; 423 424 if (args->bufsize != sizeof(struct l_statfs64)) 425 return EINVAL; 426 427 LCONVPATHEXIST(td, args->path, &path); 428 429 #ifdef DEBUG 430 if (ldebug(statfs64)) 431 printf(ARGS(statfs64, "%s, *"), path); 432 #endif 433 error = kern_statfs(td, path, UIO_SYSSPACE, &bsd_statfs); 434 LFREEPATH(path); 435 if (error) 436 return (error); 437 bsd_to_linux_statfs64(&bsd_statfs, &linux_statfs); 438 return copyout(&linux_statfs, args->buf, sizeof(linux_statfs)); 439 } 440 441 int 442 linux_fstatfs(struct thread *td, struct linux_fstatfs_args *args) 443 { 444 struct l_statfs linux_statfs; 445 struct statfs bsd_statfs; 446 int error; 447 448 #ifdef DEBUG 449 if (ldebug(fstatfs)) 450 printf(ARGS(fstatfs, "%d, *"), args->fd); 451 #endif 452 error = kern_fstatfs(td, args->fd, &bsd_statfs); 453 if (error) 454 return error; 455 bsd_to_linux_statfs(&bsd_statfs, &linux_statfs); 456 return copyout(&linux_statfs, args->buf, sizeof(linux_statfs)); 457 } 458 459 struct l_ustat 460 { 461 l_daddr_t f_tfree; 462 l_ino_t f_tinode; 463 char f_fname[6]; 464 char f_fpack[6]; 465 }; 466 467 int 468 linux_ustat(struct thread *td, struct linux_ustat_args *args) 469 { 470 #ifdef DEBUG 471 if (ldebug(ustat)) 472 printf(ARGS(ustat, "%d, *"), args->dev); 473 #endif 474 475 return (EOPNOTSUPP); 476 } 477 478 #if defined(__i386__) || (defined(__amd64__) && defined(COMPAT_LINUX32)) 479 480 static int 481 stat64_copyout(struct stat *buf, void *ubuf) 482 { 483 struct l_stat64 lbuf; 484 485 bzero(&lbuf, sizeof(lbuf)); 486 lbuf.st_dev = uminor(buf->st_dev) | (umajor(buf->st_dev) << 8); 487 lbuf.st_ino = buf->st_ino; 488 lbuf.st_mode = buf->st_mode; 489 lbuf.st_nlink = buf->st_nlink; 490 lbuf.st_uid = buf->st_uid; 491 lbuf.st_gid = buf->st_gid; 492 lbuf.st_rdev = buf->st_rdev; 493 lbuf.st_size = buf->st_size; 494 lbuf.st_atime = buf->st_atime; 495 lbuf.st_mtime = buf->st_mtime; 496 lbuf.st_ctime = buf->st_ctime; 497 lbuf.st_blksize = buf->st_blksize; 498 lbuf.st_blocks = buf->st_blocks; 499 500 /* 501 * The __st_ino field makes all the difference. In the Linux kernel 502 * it is conditionally compiled based on STAT64_HAS_BROKEN_ST_INO, 503 * but without the assignment to __st_ino the runtime linker refuses 504 * to mmap(2) any shared libraries. I guess it's broken alright :-) 505 */ 506 lbuf.__st_ino = buf->st_ino; 507 508 return (copyout(&lbuf, ubuf, sizeof(lbuf))); 509 } 510 511 int 512 linux_stat64(struct thread *td, struct linux_stat64_args *args) 513 { 514 struct stat buf; 515 char *filename; 516 int error; 517 518 LCONVPATHEXIST(td, args->filename, &filename); 519 520 #ifdef DEBUG 521 if (ldebug(stat64)) 522 printf(ARGS(stat64, "%s, *"), filename); 523 #endif 524 525 error = kern_stat(td, filename, UIO_SYSSPACE, &buf); 526 if (!error) { 527 if (strlen(filename) > strlen("/dev/pts/") && 528 !strncmp(filename, "/dev/pts/", strlen("/dev/pts/")) && 529 filename[9] >= '' && filename[9] <= '9') { 530 /* 531 * Linux checks major and minors of the slave device 532 * to make sure it's a pty deivce, so let's make him 533 * believe it is. 534 */ 535 buf.st_rdev = (136 << 8); 536 } else 537 translate_path_major_minor(td, filename, &buf); 538 } 539 LFREEPATH(filename); 540 if (error) 541 return (error); 542 return (stat64_copyout(&buf, args->statbuf)); 543 } 544 545 int 546 linux_lstat64(struct thread *td, struct linux_lstat64_args *args) 547 { 548 struct stat sb; 549 char *filename; 550 int error; 551 552 LCONVPATHEXIST(td, args->filename, &filename); 553 554 #ifdef DEBUG 555 if (ldebug(lstat64)) 556 printf(ARGS(lstat64, "%s, *"), args->filename); 557 #endif 558 559 error = kern_lstat(td, filename, UIO_SYSSPACE, &sb); 560 if (!error) 561 translate_path_major_minor(td, filename, &sb); 562 LFREEPATH(filename); 563 if (error) 564 return (error); 565 return (stat64_copyout(&sb, args->statbuf)); 566 } 567 568 int 569 linux_fstat64(struct thread *td, struct linux_fstat64_args *args) 570 { 571 struct stat buf; 572 int error; 573 574 #ifdef DEBUG 575 if (ldebug(fstat64)) 576 printf(ARGS(fstat64, "%d, *"), args->fd); 577 #endif 578 579 error = kern_fstat(td, args->fd, &buf); 580 translate_fd_major_minor(td, args->fd, &buf); 581 if (!error) 582 error = stat64_copyout(&buf, args->statbuf); 583 584 return (error); 585 } 586 587 #endif /* __i386__ || (__amd64__ && COMPAT_LINUX32) */
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