1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 1994-1995 Søren Schmidt 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 __FBSDID("$FreeBSD$"); 31 32 #include "opt_compat.h" 33 34 #include <sys/param.h> 35 #include <sys/capsicum.h> 36 #include <sys/dirent.h> 37 #include <sys/file.h> 38 #include <sys/filedesc.h> 39 #include <sys/proc.h> 40 #include <sys/malloc.h> 41 #include <sys/mount.h> 42 #include <sys/namei.h> 43 #include <sys/stat.h> 44 #include <sys/syscallsubr.h> 45 #include <sys/systm.h> 46 #include <sys/tty.h> 47 #include <sys/vnode.h> 48 #include <sys/conf.h> 49 #include <sys/fcntl.h> 50 51 #ifdef COMPAT_LINUX32 52 #include <machine/../linux32/linux.h> 53 #include <machine/../linux32/linux32_proto.h> 54 #else 55 #include <machine/../linux/linux.h> 56 #include <machine/../linux/linux_proto.h> 57 #endif 58 59 #include <compat/linux/linux_util.h> 60 #include <compat/linux/linux_file.h> 61 62 63 static void 64 translate_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 75 static int 76 linux_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(td, flag, fd, path, pathseg, sbp, 81 translate_vnhook_major_minor)); 82 } 83 84 #ifdef LINUX_LEGACY_SYSCALLS 85 static int 86 linux_kern_stat(struct thread *td, char *path, enum uio_seg pathseg, 87 struct stat *sbp) 88 { 89 90 return (linux_kern_statat(td, 0, AT_FDCWD, path, pathseg, sbp)); 91 } 92 93 static int 94 linux_kern_lstat(struct thread *td, char *path, enum uio_seg pathseg, 95 struct stat *sbp) 96 { 97 98 return (linux_kern_statat(td, AT_SYMLINK_NOFOLLOW, AT_FDCWD, path, 99 pathseg, sbp)); 100 } 101 #endif 102 103 static void 104 translate_fd_major_minor(struct thread *td, int fd, struct stat *buf) 105 { 106 struct file *fp; 107 struct vnode *vp; 108 int major, minor; 109 110 /* 111 * No capability rights required here. 112 */ 113 if ((!S_ISCHR(buf->st_mode) && !S_ISBLK(buf->st_mode)) || 114 fget(td, fd, &cap_no_rights, &fp) != 0) 115 return; 116 vp = fp->f_vnode; 117 if (vp != NULL && vp->v_rdev != NULL && 118 linux_driver_get_major_minor(devtoname(vp->v_rdev), 119 &major, &minor) == 0) { 120 buf->st_rdev = (major << 8 | minor); 121 } else if (fp->f_type == DTYPE_PTS) { 122 struct tty *tp = fp->f_data; 123 124 /* Convert the numbers for the slave device. */ 125 if (linux_driver_get_major_minor(devtoname(tp->t_dev), 126 &major, &minor) == 0) { 127 buf->st_rdev = (major << 8 | minor); 128 } 129 } 130 fdrop(fp, td); 131 } 132 133 /* 134 * l_dev_t has the same encoding as dev_t in the latter's low 16 bits, so 135 * truncation of a dev_t to 16 bits gives the same result as unpacking 136 * using major() and minor() and repacking in the l_dev_t format. This 137 * detail is hidden in dev_to_ldev(). Overflow in conversions of dev_t's 138 * are not checked for, as for other fields. 139 * 140 * dev_to_ldev() is only used for translating st_dev. When we convert 141 * st_rdev for copying it out, it isn't really a dev_t, but has already 142 * been translated to an l_dev_t in a nontrivial way. Translating it 143 * again would be illogical but would have no effect since the low 16 144 * bits have the same encoding. 145 * 146 * The nontrivial translation for st_rdev renumbers some devices, but not 147 * ones that can be mounted on, so it is consistent with the translation 148 * for st_dev except when the renumbering or truncation causes conflicts. 149 */ 150 #define dev_to_ldev(d) ((uint16_t)(d)) 151 152 static int 153 newstat_copyout(struct stat *buf, void *ubuf) 154 { 155 struct l_newstat tbuf; 156 157 bzero(&tbuf, sizeof(tbuf)); 158 tbuf.st_dev = dev_to_ldev(buf->st_dev); 159 tbuf.st_ino = buf->st_ino; 160 tbuf.st_mode = buf->st_mode; 161 tbuf.st_nlink = buf->st_nlink; 162 tbuf.st_uid = buf->st_uid; 163 tbuf.st_gid = buf->st_gid; 164 tbuf.st_rdev = buf->st_rdev; 165 tbuf.st_size = buf->st_size; 166 tbuf.st_atim.tv_sec = buf->st_atim.tv_sec; 167 tbuf.st_atim.tv_nsec = buf->st_atim.tv_nsec; 168 tbuf.st_mtim.tv_sec = buf->st_mtim.tv_sec; 169 tbuf.st_mtim.tv_nsec = buf->st_mtim.tv_nsec; 170 tbuf.st_ctim.tv_sec = buf->st_ctim.tv_sec; 171 tbuf.st_ctim.tv_nsec = buf->st_ctim.tv_nsec; 172 tbuf.st_blksize = buf->st_blksize; 173 tbuf.st_blocks = buf->st_blocks; 174 175 return (copyout(&tbuf, ubuf, sizeof(tbuf))); 176 } 177 178 #ifdef LINUX_LEGACY_SYSCALLS 179 int 180 linux_newstat(struct thread *td, struct linux_newstat_args *args) 181 { 182 struct stat buf; 183 char *path; 184 int error; 185 186 LCONVPATHEXIST(td, args->path, &path); 187 188 error = linux_kern_stat(td, path, UIO_SYSSPACE, &buf); 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 error = linux_kern_lstat(td, path, UIO_SYSSPACE, &sb); 205 LFREEPATH(path); 206 if (error) 207 return (error); 208 return (newstat_copyout(&sb, args->buf)); 209 } 210 #endif 211 212 int 213 linux_newfstat(struct thread *td, struct linux_newfstat_args *args) 214 { 215 struct stat buf; 216 int error; 217 218 error = kern_fstat(td, args->fd, &buf); 219 translate_fd_major_minor(td, args->fd, &buf); 220 if (!error) 221 error = newstat_copyout(&buf, args->buf); 222 223 return (error); 224 } 225 226 #if defined(__i386__) || (defined(__amd64__) && defined(COMPAT_LINUX32)) 227 static int 228 stat_copyout(struct stat *buf, void *ubuf) 229 { 230 struct l_stat lbuf; 231 232 bzero(&lbuf, sizeof(lbuf)); 233 lbuf.st_dev = dev_to_ldev(buf->st_dev); 234 lbuf.st_ino = buf->st_ino; 235 lbuf.st_mode = buf->st_mode; 236 lbuf.st_nlink = buf->st_nlink; 237 lbuf.st_uid = buf->st_uid; 238 lbuf.st_gid = buf->st_gid; 239 lbuf.st_rdev = buf->st_rdev; 240 lbuf.st_size = MIN(buf->st_size, INT32_MAX); 241 lbuf.st_atim.tv_sec = buf->st_atim.tv_sec; 242 lbuf.st_atim.tv_nsec = buf->st_atim.tv_nsec; 243 lbuf.st_mtim.tv_sec = buf->st_mtim.tv_sec; 244 lbuf.st_mtim.tv_nsec = buf->st_mtim.tv_nsec; 245 lbuf.st_ctim.tv_sec = buf->st_ctim.tv_sec; 246 lbuf.st_ctim.tv_nsec = buf->st_ctim.tv_nsec; 247 lbuf.st_blksize = buf->st_blksize; 248 lbuf.st_blocks = buf->st_blocks; 249 lbuf.st_flags = buf->st_flags; 250 lbuf.st_gen = buf->st_gen; 251 252 return (copyout(&lbuf, ubuf, sizeof(lbuf))); 253 } 254 255 int 256 linux_stat(struct thread *td, struct linux_stat_args *args) 257 { 258 struct stat buf; 259 char *path; 260 int error; 261 262 LCONVPATHEXIST(td, args->path, &path); 263 264 error = linux_kern_stat(td, path, UIO_SYSSPACE, &buf); 265 if (error) { 266 LFREEPATH(path); 267 return (error); 268 } 269 LFREEPATH(path); 270 return (stat_copyout(&buf, args->up)); 271 } 272 273 int 274 linux_lstat(struct thread *td, struct linux_lstat_args *args) 275 { 276 struct stat buf; 277 char *path; 278 int error; 279 280 LCONVPATHEXIST(td, args->path, &path); 281 282 error = linux_kern_lstat(td, path, UIO_SYSSPACE, &buf); 283 if (error) { 284 LFREEPATH(path); 285 return (error); 286 } 287 LFREEPATH(path); 288 return (stat_copyout(&buf, args->up)); 289 } 290 #endif /* __i386__ || (__amd64__ && COMPAT_LINUX32) */ 291 292 struct l_statfs { 293 l_long f_type; 294 l_long f_bsize; 295 l_long f_blocks; 296 l_long f_bfree; 297 l_long f_bavail; 298 l_long f_files; 299 l_long f_ffree; 300 l_fsid_t f_fsid; 301 l_long f_namelen; 302 l_long f_frsize; 303 l_long f_flags; 304 l_long f_spare[4]; 305 }; 306 307 #define LINUX_CODA_SUPER_MAGIC 0x73757245L 308 #define LINUX_EXT2_SUPER_MAGIC 0xEF53L 309 #define LINUX_HPFS_SUPER_MAGIC 0xf995e849L 310 #define LINUX_ISOFS_SUPER_MAGIC 0x9660L 311 #define LINUX_MSDOS_SUPER_MAGIC 0x4d44L 312 #define LINUX_NCP_SUPER_MAGIC 0x564cL 313 #define LINUX_NFS_SUPER_MAGIC 0x6969L 314 #define LINUX_NTFS_SUPER_MAGIC 0x5346544EL 315 #define LINUX_PROC_SUPER_MAGIC 0x9fa0L 316 #define LINUX_UFS_SUPER_MAGIC 0x00011954L /* XXX - UFS_MAGIC in Linux */ 317 #define LINUX_ZFS_SUPER_MAGIC 0x2FC12FC1 318 #define LINUX_DEVFS_SUPER_MAGIC 0x1373L 319 #define LINUX_SHMFS_MAGIC 0x01021994 320 321 static long 322 bsd_to_linux_ftype(const char *fstypename) 323 { 324 int i; 325 static struct {const char *bsd_name; long linux_type;} b2l_tbl[] = { 326 {"ufs", LINUX_UFS_SUPER_MAGIC}, 327 {"zfs", LINUX_ZFS_SUPER_MAGIC}, 328 {"cd9660", LINUX_ISOFS_SUPER_MAGIC}, 329 {"nfs", LINUX_NFS_SUPER_MAGIC}, 330 {"ext2fs", LINUX_EXT2_SUPER_MAGIC}, 331 {"procfs", LINUX_PROC_SUPER_MAGIC}, 332 {"msdosfs", LINUX_MSDOS_SUPER_MAGIC}, 333 {"ntfs", LINUX_NTFS_SUPER_MAGIC}, 334 {"nwfs", LINUX_NCP_SUPER_MAGIC}, 335 {"hpfs", LINUX_HPFS_SUPER_MAGIC}, 336 {"coda", LINUX_CODA_SUPER_MAGIC}, 337 {"devfs", LINUX_DEVFS_SUPER_MAGIC}, 338 {"tmpfs", LINUX_SHMFS_MAGIC}, 339 {NULL, 0L}}; 340 341 for (i = 0; b2l_tbl[i].bsd_name != NULL; i++) 342 if (strcmp(b2l_tbl[i].bsd_name, fstypename) == 0) 343 return (b2l_tbl[i].linux_type); 344 345 return (0L); 346 } 347 348 static int 349 bsd_to_linux_statfs(struct statfs *bsd_statfs, struct l_statfs *linux_statfs) 350 { 351 #if defined(__i386__) || (defined(__amd64__) && defined(COMPAT_LINUX32)) 352 uint64_t tmp; 353 354 #define LINUX_HIBITS 0xffffffff00000000ULL 355 356 tmp = bsd_statfs->f_blocks | bsd_statfs->f_bfree | bsd_statfs->f_files | 357 bsd_statfs->f_bsize; 358 if ((bsd_statfs->f_bavail != -1 && (bsd_statfs->f_bavail & LINUX_HIBITS)) || 359 (bsd_statfs->f_ffree != -1 && (bsd_statfs->f_ffree & LINUX_HIBITS)) || 360 (tmp & LINUX_HIBITS)) 361 return (EOVERFLOW); 362 #undef LINUX_HIBITS 363 #endif 364 linux_statfs->f_type = bsd_to_linux_ftype(bsd_statfs->f_fstypename); 365 linux_statfs->f_bsize = bsd_statfs->f_bsize; 366 linux_statfs->f_blocks = bsd_statfs->f_blocks; 367 linux_statfs->f_bfree = bsd_statfs->f_bfree; 368 linux_statfs->f_bavail = bsd_statfs->f_bavail; 369 linux_statfs->f_ffree = bsd_statfs->f_ffree; 370 linux_statfs->f_files = bsd_statfs->f_files; 371 linux_statfs->f_fsid.val[0] = bsd_statfs->f_fsid.val[0]; 372 linux_statfs->f_fsid.val[1] = bsd_statfs->f_fsid.val[1]; 373 linux_statfs->f_namelen = MAXNAMLEN; 374 linux_statfs->f_frsize = bsd_statfs->f_bsize; 375 linux_statfs->f_flags = 0; 376 memset(linux_statfs->f_spare, 0, sizeof(linux_statfs->f_spare)); 377 378 return (0); 379 } 380 381 int 382 linux_statfs(struct thread *td, struct linux_statfs_args *args) 383 { 384 struct l_statfs linux_statfs; 385 struct statfs *bsd_statfs; 386 char *path; 387 int error; 388 389 LCONVPATHEXIST(td, args->path, &path); 390 391 bsd_statfs = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK); 392 error = kern_statfs(td, path, UIO_SYSSPACE, bsd_statfs); 393 LFREEPATH(path); 394 if (error == 0) 395 error = bsd_to_linux_statfs(bsd_statfs, &linux_statfs); 396 free(bsd_statfs, M_STATFS); 397 if (error != 0) 398 return (error); 399 return (copyout(&linux_statfs, args->buf, sizeof(linux_statfs))); 400 } 401 402 #if defined(__i386__) || (defined(__amd64__) && defined(COMPAT_LINUX32)) 403 static void 404 bsd_to_linux_statfs64(struct statfs *bsd_statfs, struct l_statfs64 *linux_statfs) 405 { 406 407 linux_statfs->f_type = bsd_to_linux_ftype(bsd_statfs->f_fstypename); 408 linux_statfs->f_bsize = bsd_statfs->f_bsize; 409 linux_statfs->f_blocks = bsd_statfs->f_blocks; 410 linux_statfs->f_bfree = bsd_statfs->f_bfree; 411 linux_statfs->f_bavail = bsd_statfs->f_bavail; 412 linux_statfs->f_ffree = bsd_statfs->f_ffree; 413 linux_statfs->f_files = bsd_statfs->f_files; 414 linux_statfs->f_fsid.val[0] = bsd_statfs->f_fsid.val[0]; 415 linux_statfs->f_fsid.val[1] = bsd_statfs->f_fsid.val[1]; 416 linux_statfs->f_namelen = MAXNAMLEN; 417 linux_statfs->f_frsize = bsd_statfs->f_bsize; 418 linux_statfs->f_flags = 0; 419 memset(linux_statfs->f_spare, 0, sizeof(linux_statfs->f_spare)); 420 } 421 422 int 423 linux_statfs64(struct thread *td, struct linux_statfs64_args *args) 424 { 425 struct l_statfs64 linux_statfs; 426 struct statfs *bsd_statfs; 427 char *path; 428 int error; 429 430 if (args->bufsize != sizeof(struct l_statfs64)) 431 return (EINVAL); 432 433 LCONVPATHEXIST(td, args->path, &path); 434 435 bsd_statfs = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK); 436 error = kern_statfs(td, path, UIO_SYSSPACE, bsd_statfs); 437 LFREEPATH(path); 438 if (error == 0) 439 bsd_to_linux_statfs64(bsd_statfs, &linux_statfs); 440 free(bsd_statfs, M_STATFS); 441 if (error != 0) 442 return (error); 443 return (copyout(&linux_statfs, args->buf, sizeof(linux_statfs))); 444 } 445 446 int 447 linux_fstatfs64(struct thread *td, struct linux_fstatfs64_args *args) 448 { 449 struct l_statfs64 linux_statfs; 450 struct statfs *bsd_statfs; 451 int error; 452 453 if (args->bufsize != sizeof(struct l_statfs64)) 454 return (EINVAL); 455 456 bsd_statfs = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK); 457 error = kern_fstatfs(td, args->fd, bsd_statfs); 458 if (error == 0) 459 bsd_to_linux_statfs64(bsd_statfs, &linux_statfs); 460 free(bsd_statfs, M_STATFS); 461 if (error != 0) 462 return (error); 463 return (copyout(&linux_statfs, args->buf, sizeof(linux_statfs))); 464 } 465 #endif /* __i386__ || (__amd64__ && COMPAT_LINUX32) */ 466 467 int 468 linux_fstatfs(struct thread *td, struct linux_fstatfs_args *args) 469 { 470 struct l_statfs linux_statfs; 471 struct statfs *bsd_statfs; 472 int error; 473 474 bsd_statfs = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK); 475 error = kern_fstatfs(td, args->fd, bsd_statfs); 476 if (error == 0) 477 error = bsd_to_linux_statfs(bsd_statfs, &linux_statfs); 478 free(bsd_statfs, M_STATFS); 479 if (error != 0) 480 return (error); 481 return (copyout(&linux_statfs, args->buf, sizeof(linux_statfs))); 482 } 483 484 struct l_ustat 485 { 486 l_daddr_t f_tfree; 487 l_ino_t f_tinode; 488 char f_fname[6]; 489 char f_fpack[6]; 490 }; 491 492 #ifdef LINUX_LEGACY_SYSCALLS 493 int 494 linux_ustat(struct thread *td, struct linux_ustat_args *args) 495 { 496 497 return (EOPNOTSUPP); 498 } 499 #endif 500 501 #if defined(__i386__) || (defined(__amd64__) && defined(COMPAT_LINUX32)) 502 503 static int 504 stat64_copyout(struct stat *buf, void *ubuf) 505 { 506 struct l_stat64 lbuf; 507 508 bzero(&lbuf, sizeof(lbuf)); 509 lbuf.st_dev = dev_to_ldev(buf->st_dev); 510 lbuf.st_ino = buf->st_ino; 511 lbuf.st_mode = buf->st_mode; 512 lbuf.st_nlink = buf->st_nlink; 513 lbuf.st_uid = buf->st_uid; 514 lbuf.st_gid = buf->st_gid; 515 lbuf.st_rdev = buf->st_rdev; 516 lbuf.st_size = buf->st_size; 517 lbuf.st_atim.tv_sec = buf->st_atim.tv_sec; 518 lbuf.st_atim.tv_nsec = buf->st_atim.tv_nsec; 519 lbuf.st_mtim.tv_sec = buf->st_mtim.tv_sec; 520 lbuf.st_mtim.tv_nsec = buf->st_mtim.tv_nsec; 521 lbuf.st_ctim.tv_sec = buf->st_ctim.tv_sec; 522 lbuf.st_ctim.tv_nsec = buf->st_ctim.tv_nsec; 523 lbuf.st_blksize = buf->st_blksize; 524 lbuf.st_blocks = buf->st_blocks; 525 526 /* 527 * The __st_ino field makes all the difference. In the Linux kernel 528 * it is conditionally compiled based on STAT64_HAS_BROKEN_ST_INO, 529 * but without the assignment to __st_ino the runtime linker refuses 530 * to mmap(2) any shared libraries. I guess it's broken alright :-) 531 */ 532 lbuf.__st_ino = buf->st_ino; 533 534 return (copyout(&lbuf, ubuf, sizeof(lbuf))); 535 } 536 537 int 538 linux_stat64(struct thread *td, struct linux_stat64_args *args) 539 { 540 struct stat buf; 541 char *filename; 542 int error; 543 544 LCONVPATHEXIST(td, args->filename, &filename); 545 546 error = linux_kern_stat(td, filename, UIO_SYSSPACE, &buf); 547 LFREEPATH(filename); 548 if (error) 549 return (error); 550 return (stat64_copyout(&buf, args->statbuf)); 551 } 552 553 int 554 linux_lstat64(struct thread *td, struct linux_lstat64_args *args) 555 { 556 struct stat sb; 557 char *filename; 558 int error; 559 560 LCONVPATHEXIST(td, args->filename, &filename); 561 562 error = linux_kern_lstat(td, filename, UIO_SYSSPACE, &sb); 563 LFREEPATH(filename); 564 if (error) 565 return (error); 566 return (stat64_copyout(&sb, args->statbuf)); 567 } 568 569 int 570 linux_fstat64(struct thread *td, struct linux_fstat64_args *args) 571 { 572 struct stat buf; 573 int error; 574 575 error = kern_fstat(td, args->fd, &buf); 576 translate_fd_major_minor(td, args->fd, &buf); 577 if (!error) 578 error = stat64_copyout(&buf, args->statbuf); 579 580 return (error); 581 } 582 583 int 584 linux_fstatat64(struct thread *td, struct linux_fstatat64_args *args) 585 { 586 char *path; 587 int error, dfd, flag; 588 struct stat buf; 589 590 if (args->flag & ~LINUX_AT_SYMLINK_NOFOLLOW) 591 return (EINVAL); 592 flag = (args->flag & LINUX_AT_SYMLINK_NOFOLLOW) ? 593 AT_SYMLINK_NOFOLLOW : 0; 594 595 dfd = (args->dfd == LINUX_AT_FDCWD) ? AT_FDCWD : args->dfd; 596 LCONVPATHEXIST_AT(td, args->pathname, &path, dfd); 597 598 error = linux_kern_statat(td, flag, dfd, path, UIO_SYSSPACE, &buf); 599 if (!error) 600 error = stat64_copyout(&buf, args->statbuf); 601 LFREEPATH(path); 602 603 return (error); 604 } 605 606 #else /* __amd64__ && !COMPAT_LINUX32 */ 607 608 int 609 linux_newfstatat(struct thread *td, struct linux_newfstatat_args *args) 610 { 611 char *path; 612 int error, dfd, flag; 613 struct stat buf; 614 615 if (args->flag & ~LINUX_AT_SYMLINK_NOFOLLOW) 616 return (EINVAL); 617 flag = (args->flag & LINUX_AT_SYMLINK_NOFOLLOW) ? 618 AT_SYMLINK_NOFOLLOW : 0; 619 620 dfd = (args->dfd == LINUX_AT_FDCWD) ? AT_FDCWD : args->dfd; 621 LCONVPATHEXIST_AT(td, args->pathname, &path, dfd); 622 623 error = linux_kern_statat(td, flag, dfd, path, UIO_SYSSPACE, &buf); 624 if (error == 0) 625 error = newstat_copyout(&buf, args->statbuf); 626 LFREEPATH(path); 627 628 return (error); 629 } 630 631 #endif /* __i386__ || (__amd64__ && COMPAT_LINUX32) */ 632 633 int 634 linux_syncfs(struct thread *td, struct linux_syncfs_args *args) 635 { 636 struct mount *mp; 637 struct vnode *vp; 638 int error, save; 639 640 error = fgetvp(td, args->fd, &cap_fsync_rights, &vp); 641 if (error != 0) 642 /* 643 * Linux syncfs() returns only EBADF, however fgetvp() 644 * can return EINVAL in case of file descriptor does 645 * not represent a vnode. XXX. 646 */ 647 return (error); 648 649 mp = vp->v_mount; 650 mtx_lock(&mountlist_mtx); 651 error = vfs_busy(mp, MBF_MNTLSTLOCK); 652 if (error != 0) { 653 /* See comment above. */ 654 mtx_unlock(&mountlist_mtx); 655 goto out; 656 } 657 if ((mp->mnt_flag & MNT_RDONLY) == 0 && 658 vn_start_write(NULL, &mp, V_NOWAIT) == 0) { 659 save = curthread_pflags_set(TDP_SYNCIO); 660 vfs_msync(mp, MNT_NOWAIT); 661 VFS_SYNC(mp, MNT_NOWAIT); 662 curthread_pflags_restore(save); 663 vn_finished_write(mp); 664 } 665 vfs_unbusy(mp); 666 667 out: 668 vrele(vp); 669 return (error); 670 } 671