linux_stats.c revision 293524
1/*- 2 * Copyright (c) 1994-1995 S��ren 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: stable/10/sys/compat/linux/linux_stats.c 293524 2016-01-09 15:58:42Z dchagin $"); 31 32#include "opt_compat.h" 33 34#include <sys/param.h> 35#include <sys/dirent.h> 36#include <sys/file.h> 37#include <sys/filedesc.h> 38#include <sys/proc.h> 39#include <sys/malloc.h> 40#include <sys/mount.h> 41#include <sys/namei.h> 42#include <sys/stat.h> 43#include <sys/syscallsubr.h> 44#include <sys/systm.h> 45#include <sys/tty.h> 46#include <sys/vnode.h> 47#include <sys/conf.h> 48#include <sys/fcntl.h> 49 50#ifdef COMPAT_LINUX32 51#include <machine/../linux32/linux.h> 52#include <machine/../linux32/linux32_proto.h> 53#else 54#include <machine/../linux/linux.h> 55#include <machine/../linux/linux_proto.h> 56#endif 57 58#include <compat/linux/linux_util.h> 59#include <compat/linux/linux_file.h> 60 61#define LINUX_SHMFS_MAGIC 0x01021994 62 63static void 64translate_vnhook_major_minor(struct vnode *vp, struct stat *sb) 65{ 66 int major, minor; 67 68 if (vp->v_type == VCHR && vp->v_rdev != NULL && 69 linux_driver_get_major_minor(devtoname(vp->v_rdev), 70 &major, &minor) == 0) { 71 sb->st_rdev = (major << 8 | minor); 72 } 73} 74 75static int 76linux_kern_statat(struct thread *td, int flag, int fd, char *path, 77 enum uio_seg pathseg, struct stat *sbp) 78{ 79 80 return (kern_statat_vnhook(td, flag, fd, path, pathseg, sbp, 81 translate_vnhook_major_minor)); 82} 83 84static int 85linux_kern_stat(struct thread *td, char *path, enum uio_seg pathseg, 86 struct stat *sbp) 87{ 88 89 return (linux_kern_statat(td, 0, AT_FDCWD, path, pathseg, sbp)); 90} 91 92static int 93linux_kern_lstat(struct thread *td, char *path, enum uio_seg pathseg, 94 struct stat *sbp) 95{ 96 97 return (linux_kern_statat(td, AT_SYMLINK_NOFOLLOW, AT_FDCWD, path, 98 pathseg, sbp)); 99} 100 101/* 102 * XXX: This was removed from newstat_copyout(), and almost identical 103 * XXX: code was in stat64_copyout(). findcdev() needs to be replaced 104 * XXX: with something that does lookup and locking properly. 105 * XXX: When somebody fixes this: please try to avoid duplicating it. 106 */ 107#if 0 108static void 109disk_foo(struct somestat *tbuf) 110{ 111 struct cdevsw *cdevsw; 112 struct cdev *dev; 113 114 /* Lie about disk drives which are character devices 115 * in FreeBSD but block devices under Linux. 116 */ 117 if (S_ISCHR(tbuf.st_mode) && 118 (dev = findcdev(buf->st_rdev)) != NULL) { 119 cdevsw = dev_refthread(dev); 120 if (cdevsw != NULL) { 121 if (cdevsw->d_flags & D_DISK) { 122 tbuf.st_mode &= ~S_IFMT; 123 tbuf.st_mode |= S_IFBLK; 124 125 /* XXX this may not be quite right */ 126 /* Map major number to 0 */ 127 tbuf.st_dev = minor(buf->st_dev) & 0xf; 128 tbuf.st_rdev = buf->st_rdev & 0xff; 129 } 130 dev_relthread(dev); 131 } 132 } 133 134} 135#endif 136 137static void 138translate_fd_major_minor(struct thread *td, int fd, struct stat *buf) 139{ 140 struct file *fp; 141 struct vnode *vp; 142 int major, minor; 143 144 /* 145 * No capability rights required here. 146 */ 147 if ((!S_ISCHR(buf->st_mode) && !S_ISBLK(buf->st_mode)) || 148 fget(td, fd, 0, &fp) != 0) 149 return; 150 vp = fp->f_vnode; 151 if (vp != NULL && vp->v_rdev != NULL && 152 linux_driver_get_major_minor(devtoname(vp->v_rdev), 153 &major, &minor) == 0) { 154 buf->st_rdev = (major << 8 | minor); 155 } else if (fp->f_type == DTYPE_PTS) { 156 struct tty *tp = fp->f_data; 157 158 /* Convert the numbers for the slave device. */ 159 if (linux_driver_get_major_minor(devtoname(tp->t_dev), 160 &major, &minor) == 0) { 161 buf->st_rdev = (major << 8 | minor); 162 } 163 } 164 fdrop(fp, td); 165} 166 167static int 168newstat_copyout(struct stat *buf, void *ubuf) 169{ 170 struct l_newstat tbuf; 171 172 bzero(&tbuf, sizeof(tbuf)); 173 tbuf.st_dev = minor(buf->st_dev) | (major(buf->st_dev) << 8); 174 tbuf.st_ino = buf->st_ino; 175 tbuf.st_mode = buf->st_mode; 176 tbuf.st_nlink = buf->st_nlink; 177 tbuf.st_uid = buf->st_uid; 178 tbuf.st_gid = buf->st_gid; 179 tbuf.st_rdev = buf->st_rdev; 180 tbuf.st_size = buf->st_size; 181 tbuf.st_atim.tv_sec = buf->st_atim.tv_sec; 182 tbuf.st_atim.tv_nsec = buf->st_atim.tv_nsec; 183 tbuf.st_mtim.tv_sec = buf->st_mtim.tv_sec; 184 tbuf.st_mtim.tv_nsec = buf->st_mtim.tv_nsec; 185 tbuf.st_ctim.tv_sec = buf->st_ctim.tv_sec; 186 tbuf.st_ctim.tv_nsec = buf->st_ctim.tv_nsec; 187 tbuf.st_blksize = buf->st_blksize; 188 tbuf.st_blocks = buf->st_blocks; 189 190 return (copyout(&tbuf, ubuf, sizeof(tbuf))); 191} 192 193int 194linux_newstat(struct thread *td, struct linux_newstat_args *args) 195{ 196 struct stat buf; 197 char *path; 198 int error; 199 200 LCONVPATHEXIST(td, args->path, &path); 201 202#ifdef DEBUG 203 if (ldebug(newstat)) 204 printf(ARGS(newstat, "%s, *"), path); 205#endif 206 207 error = linux_kern_stat(td, path, UIO_SYSSPACE, &buf); 208 LFREEPATH(path); 209 if (error) 210 return (error); 211 return (newstat_copyout(&buf, args->buf)); 212} 213 214int 215linux_newlstat(struct thread *td, struct linux_newlstat_args *args) 216{ 217 struct stat sb; 218 char *path; 219 int error; 220 221 LCONVPATHEXIST(td, args->path, &path); 222 223#ifdef DEBUG 224 if (ldebug(newlstat)) 225 printf(ARGS(newlstat, "%s, *"), path); 226#endif 227 228 error = linux_kern_lstat(td, path, UIO_SYSSPACE, &sb); 229 LFREEPATH(path); 230 if (error) 231 return (error); 232 return (newstat_copyout(&sb, args->buf)); 233} 234 235int 236linux_newfstat(struct thread *td, struct linux_newfstat_args *args) 237{ 238 struct stat buf; 239 int error; 240 241#ifdef DEBUG 242 if (ldebug(newfstat)) 243 printf(ARGS(newfstat, "%d, *"), args->fd); 244#endif 245 246 error = kern_fstat(td, args->fd, &buf); 247 translate_fd_major_minor(td, args->fd, &buf); 248 if (!error) 249 error = newstat_copyout(&buf, args->buf); 250 251 return (error); 252} 253 254#if defined(__i386__) || (defined(__amd64__) && defined(COMPAT_LINUX32)) 255static int 256stat_copyout(struct stat *buf, void *ubuf) 257{ 258 struct l_stat lbuf; 259 260 bzero(&lbuf, sizeof(lbuf)); 261 lbuf.st_dev = buf->st_dev; 262 lbuf.st_ino = buf->st_ino; 263 lbuf.st_mode = buf->st_mode; 264 lbuf.st_nlink = buf->st_nlink; 265 lbuf.st_uid = buf->st_uid; 266 lbuf.st_gid = buf->st_gid; 267 lbuf.st_rdev = buf->st_rdev; 268 if (buf->st_size < (quad_t)1 << 32) 269 lbuf.st_size = buf->st_size; 270 else 271 lbuf.st_size = -2; 272 lbuf.st_atim.tv_sec = buf->st_atim.tv_sec; 273 lbuf.st_atim.tv_nsec = buf->st_atim.tv_nsec; 274 lbuf.st_mtim.tv_sec = buf->st_mtim.tv_sec; 275 lbuf.st_mtim.tv_nsec = buf->st_mtim.tv_nsec; 276 lbuf.st_ctim.tv_sec = buf->st_ctim.tv_sec; 277 lbuf.st_ctim.tv_nsec = buf->st_ctim.tv_nsec; 278 lbuf.st_blksize = buf->st_blksize; 279 lbuf.st_blocks = buf->st_blocks; 280 lbuf.st_flags = buf->st_flags; 281 lbuf.st_gen = buf->st_gen; 282 283 return (copyout(&lbuf, ubuf, sizeof(lbuf))); 284} 285 286int 287linux_stat(struct thread *td, struct linux_stat_args *args) 288{ 289 struct stat buf; 290 char *path; 291 int error; 292 293 LCONVPATHEXIST(td, args->path, &path); 294 295#ifdef DEBUG 296 if (ldebug(stat)) 297 printf(ARGS(stat, "%s, *"), path); 298#endif 299 error = linux_kern_stat(td, path, UIO_SYSSPACE, &buf); 300 if (error) { 301 LFREEPATH(path); 302 return (error); 303 } 304 LFREEPATH(path); 305 return(stat_copyout(&buf, args->up)); 306} 307 308int 309linux_lstat(struct thread *td, struct linux_lstat_args *args) 310{ 311 struct stat buf; 312 char *path; 313 int error; 314 315 LCONVPATHEXIST(td, args->path, &path); 316 317#ifdef DEBUG 318 if (ldebug(lstat)) 319 printf(ARGS(lstat, "%s, *"), path); 320#endif 321 error = linux_kern_lstat(td, path, UIO_SYSSPACE, &buf); 322 if (error) { 323 LFREEPATH(path); 324 return (error); 325 } 326 LFREEPATH(path); 327 return(stat_copyout(&buf, args->up)); 328} 329#endif /* __i386__ || (__amd64__ && COMPAT_LINUX32) */ 330 331struct l_statfs { 332 l_long f_type; 333 l_long f_bsize; 334 l_long f_blocks; 335 l_long f_bfree; 336 l_long f_bavail; 337 l_long f_files; 338 l_long f_ffree; 339 l_fsid_t f_fsid; 340 l_long f_namelen; 341 l_long f_spare[6]; 342}; 343 344#define LINUX_CODA_SUPER_MAGIC 0x73757245L 345#define LINUX_EXT2_SUPER_MAGIC 0xEF53L 346#define LINUX_HPFS_SUPER_MAGIC 0xf995e849L 347#define LINUX_ISOFS_SUPER_MAGIC 0x9660L 348#define LINUX_MSDOS_SUPER_MAGIC 0x4d44L 349#define LINUX_NCP_SUPER_MAGIC 0x564cL 350#define LINUX_NFS_SUPER_MAGIC 0x6969L 351#define LINUX_NTFS_SUPER_MAGIC 0x5346544EL 352#define LINUX_PROC_SUPER_MAGIC 0x9fa0L 353#define LINUX_UFS_SUPER_MAGIC 0x00011954L /* XXX - UFS_MAGIC in Linux */ 354#define LINUX_DEVFS_SUPER_MAGIC 0x1373L 355 356static long 357bsd_to_linux_ftype(const char *fstypename) 358{ 359 int i; 360 static struct {const char *bsd_name; long linux_type;} b2l_tbl[] = { 361 {"ufs", LINUX_UFS_SUPER_MAGIC}, 362 {"cd9660", LINUX_ISOFS_SUPER_MAGIC}, 363 {"nfs", LINUX_NFS_SUPER_MAGIC}, 364 {"ext2fs", LINUX_EXT2_SUPER_MAGIC}, 365 {"procfs", LINUX_PROC_SUPER_MAGIC}, 366 {"msdosfs", LINUX_MSDOS_SUPER_MAGIC}, 367 {"ntfs", LINUX_NTFS_SUPER_MAGIC}, 368 {"nwfs", LINUX_NCP_SUPER_MAGIC}, 369 {"hpfs", LINUX_HPFS_SUPER_MAGIC}, 370 {"coda", LINUX_CODA_SUPER_MAGIC}, 371 {"devfs", LINUX_DEVFS_SUPER_MAGIC}, 372 {NULL, 0L}}; 373 374 for (i = 0; b2l_tbl[i].bsd_name != NULL; i++) 375 if (strcmp(b2l_tbl[i].bsd_name, fstypename) == 0) 376 return (b2l_tbl[i].linux_type); 377 378 return (0L); 379} 380 381static void 382bsd_to_linux_statfs(struct statfs *bsd_statfs, struct l_statfs *linux_statfs) 383{ 384 385 linux_statfs->f_type = bsd_to_linux_ftype(bsd_statfs->f_fstypename); 386 linux_statfs->f_bsize = bsd_statfs->f_bsize; 387 linux_statfs->f_blocks = bsd_statfs->f_blocks; 388 linux_statfs->f_bfree = bsd_statfs->f_bfree; 389 linux_statfs->f_bavail = bsd_statfs->f_bavail; 390 linux_statfs->f_ffree = bsd_statfs->f_ffree; 391 linux_statfs->f_files = bsd_statfs->f_files; 392 linux_statfs->f_fsid.val[0] = bsd_statfs->f_fsid.val[0]; 393 linux_statfs->f_fsid.val[1] = bsd_statfs->f_fsid.val[1]; 394 linux_statfs->f_namelen = MAXNAMLEN; 395} 396 397int 398linux_statfs(struct thread *td, struct linux_statfs_args *args) 399{ 400 struct l_statfs linux_statfs; 401 struct statfs bsd_statfs; 402 char *path; 403 int error, dev_shm; 404 405 LCONVPATHEXIST(td, args->path, &path); 406 407#ifdef DEBUG 408 if (ldebug(statfs)) 409 printf(ARGS(statfs, "%s, *"), path); 410#endif 411 dev_shm = 0; 412 error = kern_statfs(td, path, UIO_SYSSPACE, &bsd_statfs); 413 if (strncmp(path, "/dev/shm", sizeof("/dev/shm") - 1) == 0) 414 dev_shm = (path[8] == '\0' 415 || (path[8] == '/' && path[9] == '\0')); 416 LFREEPATH(path); 417 if (error) 418 return (error); 419 bsd_to_linux_statfs(&bsd_statfs, &linux_statfs); 420 if (dev_shm) 421 linux_statfs.f_type = LINUX_SHMFS_MAGIC; 422 return copyout(&linux_statfs, args->buf, sizeof(linux_statfs)); 423} 424 425#if defined(__i386__) || (defined(__amd64__) && defined(COMPAT_LINUX32)) 426static void 427bsd_to_linux_statfs64(struct statfs *bsd_statfs, struct l_statfs64 *linux_statfs) 428{ 429 430 linux_statfs->f_type = bsd_to_linux_ftype(bsd_statfs->f_fstypename); 431 linux_statfs->f_bsize = bsd_statfs->f_bsize; 432 linux_statfs->f_blocks = bsd_statfs->f_blocks; 433 linux_statfs->f_bfree = bsd_statfs->f_bfree; 434 linux_statfs->f_bavail = bsd_statfs->f_bavail; 435 linux_statfs->f_ffree = bsd_statfs->f_ffree; 436 linux_statfs->f_files = bsd_statfs->f_files; 437 linux_statfs->f_fsid.val[0] = bsd_statfs->f_fsid.val[0]; 438 linux_statfs->f_fsid.val[1] = bsd_statfs->f_fsid.val[1]; 439 linux_statfs->f_namelen = MAXNAMLEN; 440} 441 442int 443linux_statfs64(struct thread *td, struct linux_statfs64_args *args) 444{ 445 struct l_statfs64 linux_statfs; 446 struct statfs bsd_statfs; 447 char *path; 448 int error; 449 450 if (args->bufsize != sizeof(struct l_statfs64)) 451 return EINVAL; 452 453 LCONVPATHEXIST(td, args->path, &path); 454 455#ifdef DEBUG 456 if (ldebug(statfs64)) 457 printf(ARGS(statfs64, "%s, *"), path); 458#endif 459 error = kern_statfs(td, path, UIO_SYSSPACE, &bsd_statfs); 460 LFREEPATH(path); 461 if (error) 462 return (error); 463 bsd_to_linux_statfs64(&bsd_statfs, &linux_statfs); 464 return copyout(&linux_statfs, args->buf, sizeof(linux_statfs)); 465} 466#endif /* __i386__ || (__amd64__ && COMPAT_LINUX32) */ 467 468int 469linux_fstatfs(struct thread *td, struct linux_fstatfs_args *args) 470{ 471 struct l_statfs linux_statfs; 472 struct statfs bsd_statfs; 473 int error; 474 475#ifdef DEBUG 476 if (ldebug(fstatfs)) 477 printf(ARGS(fstatfs, "%d, *"), args->fd); 478#endif 479 error = kern_fstatfs(td, args->fd, &bsd_statfs); 480 if (error) 481 return error; 482 bsd_to_linux_statfs(&bsd_statfs, &linux_statfs); 483 return copyout(&linux_statfs, args->buf, sizeof(linux_statfs)); 484} 485 486struct l_ustat 487{ 488 l_daddr_t f_tfree; 489 l_ino_t f_tinode; 490 char f_fname[6]; 491 char f_fpack[6]; 492}; 493 494int 495linux_ustat(struct thread *td, struct linux_ustat_args *args) 496{ 497#ifdef DEBUG 498 if (ldebug(ustat)) 499 printf(ARGS(ustat, "%ju, *"), (uintmax_t)args->dev); 500#endif 501 502 return (EOPNOTSUPP); 503} 504 505#if defined(__i386__) || (defined(__amd64__) && defined(COMPAT_LINUX32)) 506 507static int 508stat64_copyout(struct stat *buf, void *ubuf) 509{ 510 struct l_stat64 lbuf; 511 512 bzero(&lbuf, sizeof(lbuf)); 513 lbuf.st_dev = minor(buf->st_dev) | (major(buf->st_dev) << 8); 514 lbuf.st_ino = buf->st_ino; 515 lbuf.st_mode = buf->st_mode; 516 lbuf.st_nlink = buf->st_nlink; 517 lbuf.st_uid = buf->st_uid; 518 lbuf.st_gid = buf->st_gid; 519 lbuf.st_rdev = buf->st_rdev; 520 lbuf.st_size = buf->st_size; 521 lbuf.st_atim.tv_sec = buf->st_atim.tv_sec; 522 lbuf.st_atim.tv_nsec = buf->st_atim.tv_nsec; 523 lbuf.st_mtim.tv_sec = buf->st_mtim.tv_sec; 524 lbuf.st_mtim.tv_nsec = buf->st_mtim.tv_nsec; 525 lbuf.st_ctim.tv_sec = buf->st_ctim.tv_sec; 526 lbuf.st_ctim.tv_nsec = buf->st_ctim.tv_nsec; 527 lbuf.st_blksize = buf->st_blksize; 528 lbuf.st_blocks = buf->st_blocks; 529 530 /* 531 * The __st_ino field makes all the difference. In the Linux kernel 532 * it is conditionally compiled based on STAT64_HAS_BROKEN_ST_INO, 533 * but without the assignment to __st_ino the runtime linker refuses 534 * to mmap(2) any shared libraries. I guess it's broken alright :-) 535 */ 536 lbuf.__st_ino = buf->st_ino; 537 538 return (copyout(&lbuf, ubuf, sizeof(lbuf))); 539} 540 541int 542linux_stat64(struct thread *td, struct linux_stat64_args *args) 543{ 544 struct stat buf; 545 char *filename; 546 int error; 547 548 LCONVPATHEXIST(td, args->filename, &filename); 549 550#ifdef DEBUG 551 if (ldebug(stat64)) 552 printf(ARGS(stat64, "%s, *"), filename); 553#endif 554 555 error = linux_kern_stat(td, filename, UIO_SYSSPACE, &buf); 556 LFREEPATH(filename); 557 if (error) 558 return (error); 559 return (stat64_copyout(&buf, args->statbuf)); 560} 561 562int 563linux_lstat64(struct thread *td, struct linux_lstat64_args *args) 564{ 565 struct stat sb; 566 char *filename; 567 int error; 568 569 LCONVPATHEXIST(td, args->filename, &filename); 570 571#ifdef DEBUG 572 if (ldebug(lstat64)) 573 printf(ARGS(lstat64, "%s, *"), args->filename); 574#endif 575 576 error = linux_kern_lstat(td, filename, UIO_SYSSPACE, &sb); 577 LFREEPATH(filename); 578 if (error) 579 return (error); 580 return (stat64_copyout(&sb, args->statbuf)); 581} 582 583int 584linux_fstat64(struct thread *td, struct linux_fstat64_args *args) 585{ 586 struct stat buf; 587 int error; 588 589#ifdef DEBUG 590 if (ldebug(fstat64)) 591 printf(ARGS(fstat64, "%d, *"), args->fd); 592#endif 593 594 error = kern_fstat(td, args->fd, &buf); 595 translate_fd_major_minor(td, args->fd, &buf); 596 if (!error) 597 error = stat64_copyout(&buf, args->statbuf); 598 599 return (error); 600} 601 602int 603linux_fstatat64(struct thread *td, struct linux_fstatat64_args *args) 604{ 605 char *path; 606 int error, dfd, flag; 607 struct stat buf; 608 609 if (args->flag & ~LINUX_AT_SYMLINK_NOFOLLOW) 610 return (EINVAL); 611 flag = (args->flag & LINUX_AT_SYMLINK_NOFOLLOW) ? 612 AT_SYMLINK_NOFOLLOW : 0; 613 614 dfd = (args->dfd == LINUX_AT_FDCWD) ? AT_FDCWD : args->dfd; 615 LCONVPATHEXIST_AT(td, args->pathname, &path, dfd); 616 617#ifdef DEBUG 618 if (ldebug(fstatat64)) 619 printf(ARGS(fstatat64, "%i, %s, %i"), args->dfd, path, args->flag); 620#endif 621 622 error = linux_kern_statat(td, flag, dfd, path, UIO_SYSSPACE, &buf); 623 if (!error) 624 error = stat64_copyout(&buf, args->statbuf); 625 LFREEPATH(path); 626 627 return (error); 628} 629 630#endif /* __i386__ || (__amd64__ && COMPAT_LINUX32) */ 631