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/6.2/sys/compat/linux/linux_stats.c 159649 2006-06-15 19:08:03Z ambrisko $"); 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 translate_path_major_minor(td, path, &sb); 215 LFREEPATH(path); 216 if (error) 217 return (error); 218 return (newstat_copyout(&sb, args->buf)); 219 } 220 221 int 222 linux_newfstat(struct thread *td, struct linux_newfstat_args *args) 223 { 224 struct stat buf; 225 int error; 226 227 #ifdef DEBUG 228 if (ldebug(newfstat)) 229 printf(ARGS(newfstat, "%d, *"), args->fd); 230 #endif 231 232 error = kern_fstat(td, args->fd, &buf); 233 translate_fd_major_minor(td, args->fd, &buf); 234 if (!error) 235 error = newstat_copyout(&buf, args->buf); 236 237 return (error); 238 } 239 240 /* XXX - All fields of type l_int are defined as l_long on i386 */ 241 struct l_statfs { 242 l_int f_type; 243 l_int f_bsize; 244 l_int f_blocks; 245 l_int f_bfree; 246 l_int f_bavail; 247 l_int f_files; 248 l_int f_ffree; 249 l_fsid_t f_fsid; 250 l_int f_namelen; 251 l_int f_spare[6]; 252 }; 253 254 #define LINUX_CODA_SUPER_MAGIC 0x73757245L 255 #define LINUX_EXT2_SUPER_MAGIC 0xEF53L 256 #define LINUX_HPFS_SUPER_MAGIC 0xf995e849L 257 #define LINUX_ISOFS_SUPER_MAGIC 0x9660L 258 #define LINUX_MSDOS_SUPER_MAGIC 0x4d44L 259 #define LINUX_NCP_SUPER_MAGIC 0x564cL 260 #define LINUX_NFS_SUPER_MAGIC 0x6969L 261 #define LINUX_NTFS_SUPER_MAGIC 0x5346544EL 262 #define LINUX_PROC_SUPER_MAGIC 0x9fa0L 263 #define LINUX_UFS_SUPER_MAGIC 0x00011954L /* XXX - UFS_MAGIC in Linux */ 264 265 static long 266 bsd_to_linux_ftype(const char *fstypename) 267 { 268 int i; 269 static struct {const char *bsd_name; long linux_type;} b2l_tbl[] = { 270 {"ufs", LINUX_UFS_SUPER_MAGIC}, 271 {"cd9660", LINUX_ISOFS_SUPER_MAGIC}, 272 {"nfs", LINUX_NFS_SUPER_MAGIC}, 273 {"ext2fs", LINUX_EXT2_SUPER_MAGIC}, 274 {"procfs", LINUX_PROC_SUPER_MAGIC}, 275 {"msdosfs", LINUX_MSDOS_SUPER_MAGIC}, 276 {"ntfs", LINUX_NTFS_SUPER_MAGIC}, 277 {"nwfs", LINUX_NCP_SUPER_MAGIC}, 278 {"hpfs", LINUX_HPFS_SUPER_MAGIC}, 279 {"coda", LINUX_CODA_SUPER_MAGIC}, 280 {NULL, 0L}}; 281 282 for (i = 0; b2l_tbl[i].bsd_name != NULL; i++) 283 if (strcmp(b2l_tbl[i].bsd_name, fstypename) == 0) 284 return (b2l_tbl[i].linux_type); 285 286 return (0L); 287 } 288 289 static void 290 bsd_to_linux_statfs(struct statfs *bsd_statfs, struct l_statfs *linux_statfs) 291 { 292 293 linux_statfs->f_type = bsd_to_linux_ftype(bsd_statfs->f_fstypename); 294 linux_statfs->f_bsize = bsd_statfs->f_bsize; 295 linux_statfs->f_blocks = bsd_statfs->f_blocks; 296 linux_statfs->f_bfree = bsd_statfs->f_bfree; 297 linux_statfs->f_bavail = bsd_statfs->f_bavail; 298 linux_statfs->f_ffree = bsd_statfs->f_ffree; 299 linux_statfs->f_files = bsd_statfs->f_files; 300 linux_statfs->f_fsid.val[0] = bsd_statfs->f_fsid.val[0]; 301 linux_statfs->f_fsid.val[1] = bsd_statfs->f_fsid.val[1]; 302 linux_statfs->f_namelen = MAXNAMLEN; 303 } 304 305 int 306 linux_statfs(struct thread *td, struct linux_statfs_args *args) 307 { 308 struct l_statfs linux_statfs; 309 struct statfs bsd_statfs; 310 char *path; 311 int error; 312 313 LCONVPATHEXIST(td, args->path, &path); 314 315 #ifdef DEBUG 316 if (ldebug(statfs)) 317 printf(ARGS(statfs, "%s, *"), path); 318 #endif 319 error = kern_statfs(td, path, UIO_SYSSPACE, &bsd_statfs); 320 LFREEPATH(path); 321 if (error) 322 return (error); 323 bsd_to_linux_statfs(&bsd_statfs, &linux_statfs); 324 return copyout(&linux_statfs, args->buf, sizeof(linux_statfs)); 325 } 326 327 int 328 linux_fstatfs(struct thread *td, struct linux_fstatfs_args *args) 329 { 330 struct l_statfs linux_statfs; 331 struct statfs bsd_statfs; 332 int error; 333 334 #ifdef DEBUG 335 if (ldebug(fstatfs)) 336 printf(ARGS(fstatfs, "%d, *"), args->fd); 337 #endif 338 error = kern_fstatfs(td, args->fd, &bsd_statfs); 339 if (error) 340 return error; 341 bsd_to_linux_statfs(&bsd_statfs, &linux_statfs); 342 return copyout(&linux_statfs, args->buf, sizeof(linux_statfs)); 343 } 344 345 struct l_ustat 346 { 347 l_daddr_t f_tfree; 348 l_ino_t f_tinode; 349 char f_fname[6]; 350 char f_fpack[6]; 351 }; 352 353 int 354 linux_ustat(struct thread *td, struct linux_ustat_args *args) 355 { 356 #ifdef DEBUG 357 if (ldebug(ustat)) 358 printf(ARGS(ustat, "%d, *"), args->dev); 359 #endif 360 361 return (EOPNOTSUPP); 362 } 363 364 #if defined(__i386__) || (defined(__amd64__) && defined(COMPAT_LINUX32)) 365 366 static int 367 stat64_copyout(struct stat *buf, void *ubuf) 368 { 369 struct l_stat64 lbuf; 370 371 bzero(&lbuf, sizeof(lbuf)); 372 lbuf.st_dev = uminor(buf->st_dev) | (umajor(buf->st_dev) << 8); 373 lbuf.st_ino = buf->st_ino; 374 lbuf.st_mode = buf->st_mode; 375 lbuf.st_nlink = buf->st_nlink; 376 lbuf.st_uid = buf->st_uid; 377 lbuf.st_gid = buf->st_gid; 378 lbuf.st_rdev = buf->st_rdev; 379 lbuf.st_size = buf->st_size; 380 lbuf.st_atime = buf->st_atime; 381 lbuf.st_mtime = buf->st_mtime; 382 lbuf.st_ctime = buf->st_ctime; 383 lbuf.st_blksize = buf->st_blksize; 384 lbuf.st_blocks = buf->st_blocks; 385 386 /* 387 * The __st_ino field makes all the difference. In the Linux kernel 388 * it is conditionally compiled based on STAT64_HAS_BROKEN_ST_INO, 389 * but without the assignment to __st_ino the runtime linker refuses 390 * to mmap(2) any shared libraries. I guess it's broken alright :-) 391 */ 392 lbuf.__st_ino = buf->st_ino; 393 394 return (copyout(&lbuf, ubuf, sizeof(lbuf))); 395 } 396 397 int 398 linux_stat64(struct thread *td, struct linux_stat64_args *args) 399 { 400 struct stat buf; 401 char *filename; 402 int error; 403 404 LCONVPATHEXIST(td, args->filename, &filename); 405 406 #ifdef DEBUG 407 if (ldebug(stat64)) 408 printf(ARGS(stat64, "%s, *"), filename); 409 #endif 410 411 error = kern_stat(td, filename, UIO_SYSSPACE, &buf); 412 if (!error && strlen(filename) > strlen("/dev/pts/") && 413 !strncmp(filename, "/dev/pts/", strlen("/dev/pts/")) 414 && filename[9] >= '' && filename[9] <= '9') { 415 /* 416 * Linux checks major and minors of the slave device to make 417 * sure it's a pty deivce, so let's make him believe it is. 418 */ 419 buf.st_rdev = (136 << 8); 420 } 421 422 translate_path_major_minor(td, filename, &buf); 423 424 LFREEPATH(filename); 425 if (error) 426 return (error); 427 return (stat64_copyout(&buf, args->statbuf)); 428 } 429 430 int 431 linux_lstat64(struct thread *td, struct linux_lstat64_args *args) 432 { 433 struct stat sb; 434 char *filename; 435 int error; 436 437 LCONVPATHEXIST(td, args->filename, &filename); 438 439 #ifdef DEBUG 440 if (ldebug(lstat64)) 441 printf(ARGS(lstat64, "%s, *"), args->filename); 442 #endif 443 444 error = kern_lstat(td, filename, UIO_SYSSPACE, &sb); 445 translate_path_major_minor(td, filename, &sb); 446 LFREEPATH(filename); 447 if (error) 448 return (error); 449 return (stat64_copyout(&sb, args->statbuf)); 450 } 451 452 int 453 linux_fstat64(struct thread *td, struct linux_fstat64_args *args) 454 { 455 struct stat buf; 456 int error; 457 458 #ifdef DEBUG 459 if (ldebug(fstat64)) 460 printf(ARGS(fstat64, "%d, *"), args->fd); 461 #endif 462 463 error = kern_fstat(td, args->fd, &buf); 464 translate_fd_major_minor(td, args->fd, &buf); 465 if (!error) 466 error = stat64_copyout(&buf, args->statbuf); 467 468 return (error); 469 } 470 471 #endif /* __i386__ || (__amd64__ && COMPAT_LINUX32) */
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