Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/emulation/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 * $FreeBSD: src/sys/compat/linux/linux_stats.c,v 1.22.2.3 2001/11/05 19:08:23 marcel Exp $ 29 * $DragonFly: src/sys/emulation/linux/linux_stats.c,v 1.27 2008/09/28 05:08:16 dillon Exp $ 30 */ 31 32 #include <sys/param.h> 33 #include <sys/systm.h> 34 #include <sys/conf.h> 35 #include <sys/dirent.h> 36 #include <sys/file.h> 37 #include <sys/filedesc.h> 38 #include <sys/proc.h> 39 #include <sys/mount.h> 40 #include <sys/nlookup.h> 41 #include <sys/stat.h> 42 #include <sys/sysctl.h> 43 #include <sys/systm.h> 44 #include <sys/unistd.h> 45 #include <sys/vnode.h> 46 #include <sys/device.h> 47 #include <sys/kern_syscall.h> 48 #include <emulation/43bsd/stat.h> 49 50 #include <sys/file2.h> 51 #include <sys/mplock2.h> 52 53 #include <arch_linux/linux.h> 54 #include <arch_linux/linux_proto.h> 55 #include "linux_util.h" 56 57 static int 58 newstat_copyout(struct stat *buf, void *ubuf) 59 { 60 struct l_newstat tbuf; 61 int error; 62 63 bzero(&tbuf, sizeof(tbuf)); 64 tbuf.st_dev = uminor(buf->st_dev) | (umajor(buf->st_dev) << 8); 65 tbuf.st_ino = INO64TO32(buf->st_ino); 66 tbuf.st_mode = buf->st_mode; 67 tbuf.st_nlink = buf->st_nlink; 68 tbuf.st_uid = buf->st_uid; 69 tbuf.st_gid = buf->st_gid; 70 tbuf.st_rdev = buf->st_rdev; 71 tbuf.st_size = buf->st_size; 72 tbuf.st_atime = buf->st_atime; 73 tbuf.st_mtime = buf->st_mtime; 74 tbuf.st_ctime = buf->st_ctime; 75 tbuf.st_blksize = buf->st_blksize; 76 tbuf.st_blocks = buf->st_blocks; 77 78 error = copyout(&tbuf, ubuf, sizeof(tbuf)); 79 return (error); 80 } 81 82 static int 83 ostat_copyout(struct stat *st, struct ostat *uaddr) 84 { 85 struct ostat ost; 86 int error; 87 88 ost.st_dev = st->st_dev; 89 ost.st_ino = st->st_ino; 90 ost.st_mode = st->st_mode; 91 ost.st_nlink = st->st_nlink; 92 ost.st_uid = st->st_uid; 93 ost.st_gid = st->st_gid; 94 ost.st_rdev = st->st_rdev; 95 if (st->st_size < (quad_t)1 << 32) 96 ost.st_size = st->st_size; 97 else 98 ost.st_size = -2; 99 ost.st_atime = st->st_atime; 100 ost.st_mtime = st->st_mtime; 101 ost.st_ctime = st->st_ctime; 102 ost.st_blksize = st->st_blksize; 103 ost.st_blocks = st->st_blocks; 104 ost.st_flags = st->st_flags; 105 ost.st_gen = st->st_gen; 106 107 error = copyout(&ost, uaddr, sizeof(ost)); 108 return (error); 109 } 110 111 /* 112 * MPALMOSTSAFE 113 */ 114 int 115 sys_linux_newstat(struct linux_newstat_args *args) 116 { 117 struct stat buf; 118 struct nlookupdata nd; 119 char *path; 120 int error; 121 122 error = linux_copyin_path(args->path, &path, LINUX_PATH_EXISTS); 123 if (error) 124 return (error); 125 #ifdef DEBUG 126 if (ldebug(newstat)) 127 kprintf(ARGS(newstat, "%s, *"), path); 128 #endif 129 get_mplock(); 130 error = nlookup_init(&nd, path, UIO_SYSSPACE, NLC_FOLLOW); 131 if (error == 0) { 132 error = kern_stat(&nd, &buf); 133 if (error == 0) 134 error = newstat_copyout(&buf, args->buf); 135 nlookup_done(&nd); 136 } 137 rel_mplock(); 138 linux_free_path(&path); 139 return (error); 140 } 141 142 /* 143 * MPALMOSTSAFE 144 */ 145 int 146 sys_linux_newlstat(struct linux_newlstat_args *args) 147 { 148 struct stat sb; 149 struct nlookupdata nd; 150 char *path; 151 int error; 152 153 error = linux_copyin_path(args->path, &path, LINUX_PATH_EXISTS); 154 if (error) 155 return (error); 156 #ifdef DEBUG 157 if (ldebug(newlstat)) 158 kprintf(ARGS(newlstat, "%s, *"), path); 159 #endif 160 get_mplock(); 161 error = nlookup_init(&nd, path, UIO_SYSSPACE, 0); 162 if (error == 0) { 163 error = kern_stat(&nd, &sb); 164 if (error == 0) 165 error = newstat_copyout(&sb, args->buf); 166 nlookup_done(&nd); 167 } 168 rel_mplock(); 169 linux_free_path(&path); 170 return (error); 171 } 172 173 /* 174 * MPALMOSTSAFE 175 */ 176 int 177 sys_linux_newfstat(struct linux_newfstat_args *args) 178 { 179 struct stat buf; 180 int error; 181 182 #ifdef DEBUG 183 if (ldebug(newfstat)) 184 kprintf(ARGS(newfstat, "%d, *"), args->fd); 185 #endif 186 get_mplock(); 187 error = kern_fstat(args->fd, &buf); 188 rel_mplock(); 189 190 if (error == 0) 191 error = newstat_copyout(&buf, args->buf); 192 return (error); 193 } 194 195 /* XXX - All fields of type l_int are defined as l_long on i386 */ 196 struct l_statfs { 197 l_int f_type; 198 l_int f_bsize; 199 l_int f_blocks; 200 l_int f_bfree; 201 l_int f_bavail; 202 l_int f_files; 203 l_int f_ffree; 204 l_fsid_t f_fsid; 205 l_int f_namelen; 206 l_int f_spare[6]; 207 }; 208 209 #define LINUX_CODA_SUPER_MAGIC 0x73757245L 210 #define LINUX_EXT2_SUPER_MAGIC 0xEF53L 211 #define LINUX_HPFS_SUPER_MAGIC 0xf995e849L 212 #define LINUX_ISOFS_SUPER_MAGIC 0x9660L 213 #define LINUX_MSDOS_SUPER_MAGIC 0x4d44L 214 #define LINUX_NCP_SUPER_MAGIC 0x564cL 215 #define LINUX_NFS_SUPER_MAGIC 0x6969L 216 #define LINUX_NTFS_SUPER_MAGIC 0x5346544EL 217 #define LINUX_PROC_SUPER_MAGIC 0x9fa0L 218 #define LINUX_UFS_SUPER_MAGIC 0x00011954L /* XXX - UFS_MAGIC in Linux */ 219 220 static long 221 bsd_to_linux_ftype(const char *fstypename) 222 { 223 int i; 224 static struct {const char *bsd_name; long linux_type;} b2l_tbl[] = { 225 {"ufs", LINUX_UFS_SUPER_MAGIC}, 226 {"cd9660", LINUX_ISOFS_SUPER_MAGIC}, 227 {"nfs", LINUX_NFS_SUPER_MAGIC}, 228 {"ext2fs", LINUX_EXT2_SUPER_MAGIC}, 229 {"procfs", LINUX_PROC_SUPER_MAGIC}, 230 {"msdosfs", LINUX_MSDOS_SUPER_MAGIC}, 231 {"ntfs", LINUX_NTFS_SUPER_MAGIC}, 232 {"nwfs", LINUX_NCP_SUPER_MAGIC}, 233 {"hpfs", LINUX_HPFS_SUPER_MAGIC}, 234 {NULL, 0L}}; 235 236 for (i = 0; b2l_tbl[i].bsd_name != NULL; i++) 237 if (strcmp(b2l_tbl[i].bsd_name, fstypename) == 0) 238 return (b2l_tbl[i].linux_type); 239 240 return (0L); 241 } 242 243 static int 244 statfs_copyout(struct statfs *statfs, struct l_statfs_buf *buf, l_int namelen) 245 { 246 struct l_statfs linux_statfs; 247 int error; 248 249 linux_statfs.f_type = bsd_to_linux_ftype(statfs->f_fstypename); 250 linux_statfs.f_bsize = statfs->f_bsize; 251 linux_statfs.f_blocks = statfs->f_blocks; 252 linux_statfs.f_bfree = statfs->f_bfree; 253 linux_statfs.f_bavail = statfs->f_bavail; 254 linux_statfs.f_ffree = statfs->f_ffree; 255 linux_statfs.f_files = statfs->f_files; 256 linux_statfs.f_fsid.val[0] = statfs->f_fsid.val[0]; 257 linux_statfs.f_fsid.val[1] = statfs->f_fsid.val[1]; 258 linux_statfs.f_namelen = namelen; 259 260 error = copyout(&linux_statfs, buf, sizeof(linux_statfs)); 261 return (error); 262 } 263 264 /* 265 * MPALMOSTSAFE 266 */ 267 int 268 sys_linux_statfs(struct linux_statfs_args *args) 269 { 270 struct statfs statfs; 271 struct nlookupdata nd; 272 char *path; 273 int error, namelen; 274 275 error = linux_copyin_path(args->path, &path, LINUX_PATH_EXISTS); 276 if (error) 277 return (error); 278 #ifdef DEBUG 279 if (ldebug(statfs)) 280 kprintf(ARGS(statfs, "%s, *"), path); 281 #endif 282 get_mplock(); 283 error = nlookup_init(&nd, path, UIO_SYSSPACE, NLC_FOLLOW); 284 if (error == 0) 285 error = kern_statfs(&nd, &statfs); 286 if (error == 0) { 287 if (nd.nl_nch.ncp->nc_vp != NULL) 288 error = vn_get_namelen(nd.nl_nch.ncp->nc_vp, &namelen); 289 else 290 error = EINVAL; 291 } 292 nlookup_done(&nd); 293 rel_mplock(); 294 if (error == 0) 295 error = statfs_copyout(&statfs, args->buf, (l_int)namelen); 296 linux_free_path(&path); 297 return (error); 298 } 299 300 /* 301 * MPALMOSTSAFE 302 */ 303 int 304 sys_linux_fstatfs(struct linux_fstatfs_args *args) 305 { 306 struct proc *p = curthread->td_proc; 307 struct file *fp; 308 struct statfs statfs; 309 int error, namelen; 310 311 #ifdef DEBUG 312 if (ldebug(fstatfs)) 313 kprintf(ARGS(fstatfs, "%d, *"), args->fd); 314 #endif 315 get_mplock(); 316 if ((error = kern_fstatfs(args->fd, &statfs)) != 0) 317 return (error); 318 if ((error = holdvnode(p->p_fd, args->fd, &fp)) != 0) 319 return (error); 320 error = vn_get_namelen((struct vnode *)fp->f_data, &namelen); 321 rel_mplock(); 322 fdrop(fp); 323 if (error == 0) 324 error = statfs_copyout(&statfs, args->buf, (l_int)namelen); 325 return (error); 326 } 327 328 struct l_ustat 329 { 330 l_daddr_t f_tfree; 331 l_ino_t f_tinode; 332 char f_fname[6]; 333 char f_fpack[6]; 334 }; 335 336 /* 337 * MPALMOSTSAFE 338 */ 339 int 340 sys_linux_ustat(struct linux_ustat_args *args) 341 { 342 struct thread *td = curthread; 343 struct l_ustat lu; 344 cdev_t dev; 345 struct vnode *vp; 346 struct statfs *stat; 347 int error; 348 349 #ifdef DEBUG 350 if (ldebug(ustat)) 351 kprintf(ARGS(ustat, "%d, *"), args->dev); 352 #endif 353 354 /* 355 * lu.f_fname and lu.f_fpack are not used. They are always zeroed. 356 * lu.f_tinode and lu.f_tfree are set from the device's super block. 357 */ 358 bzero(&lu, sizeof(lu)); 359 360 /* 361 * XXX - Don't return an error if we can't find a vnode for the 362 * device. Our cdev_t is 32-bits whereas Linux only has a 16-bits 363 * cdev_t. The dev_t that is used now may as well be a truncated 364 * cdev_t returned from previous syscalls. Just return a bzeroed 365 * ustat in that case. 366 */ 367 get_mplock(); 368 dev = udev2dev(makeudev(args->dev >> 8, args->dev & 0xFF), 0); 369 if (dev != NULL && vfinddev(dev, VCHR, &vp)) { 370 if (vp->v_mount == NULL) { 371 vrele(vp); 372 error = EINVAL; 373 goto done; 374 } 375 stat = &(vp->v_mount->mnt_stat); 376 error = VFS_STATFS(vp->v_mount, stat, td->td_ucred); 377 vrele(vp); 378 if (error == 0) { 379 lu.f_tfree = stat->f_bfree; 380 lu.f_tinode = stat->f_ffree; 381 } 382 } else { 383 error = 0; 384 } 385 done: 386 rel_mplock(); 387 if (error == 0) 388 error = copyout(&lu, args->ubuf, sizeof(lu)); 389 return (error); 390 } 391 392 #if defined(__i386__) 393 394 static int 395 stat64_copyout(struct stat *buf, void *ubuf) 396 { 397 struct l_stat64 lbuf; 398 int error; 399 400 bzero(&lbuf, sizeof(lbuf)); 401 lbuf.st_dev = uminor(buf->st_dev) | (umajor(buf->st_dev) << 8); 402 lbuf.st_ino = INO64TO32(buf->st_ino); 403 lbuf.st_mode = buf->st_mode; 404 lbuf.st_nlink = buf->st_nlink; 405 lbuf.st_uid = buf->st_uid; 406 lbuf.st_gid = buf->st_gid; 407 lbuf.st_rdev = buf->st_rdev; 408 lbuf.st_size = buf->st_size; 409 lbuf.st_atime = buf->st_atime; 410 lbuf.st_mtime = buf->st_mtime; 411 lbuf.st_ctime = buf->st_ctime; 412 lbuf.st_blksize = buf->st_blksize; 413 lbuf.st_blocks = buf->st_blocks; 414 415 /* 416 * The __st_ino field makes all the difference. In the Linux kernel 417 * it is conditionally compiled based on STAT64_HAS_BROKEN_ST_INO, 418 * but without the assignment to __st_ino the runtime linker refuses 419 * to mmap(2) any shared libraries. I guess it's broken alright :-) 420 */ 421 lbuf.__st_ino = INO64TO32(buf->st_ino); 422 423 error = copyout(&lbuf, ubuf, sizeof(lbuf)); 424 return (error); 425 } 426 427 /* 428 * MPALMOSTSAFE 429 */ 430 int 431 sys_linux_stat64(struct linux_stat64_args *args) 432 { 433 struct nlookupdata nd; 434 struct stat buf; 435 char *path; 436 int error; 437 438 error = linux_copyin_path(args->filename, &path, LINUX_PATH_EXISTS); 439 if (error) 440 return (error); 441 #ifdef DEBUG 442 if (ldebug(stat64)) 443 kprintf(ARGS(stat64, "%s, *"), path); 444 #endif 445 get_mplock(); 446 error = nlookup_init(&nd, path, UIO_SYSSPACE, NLC_FOLLOW); 447 if (error == 0) { 448 error = kern_stat(&nd, &buf); 449 nlookup_done(&nd); 450 } 451 rel_mplock(); 452 if (error == 0) 453 error = stat64_copyout(&buf, args->statbuf); 454 linux_free_path(&path); 455 return (error); 456 } 457 458 /* 459 * MPALMOSTSAFE 460 */ 461 int 462 sys_linux_lstat64(struct linux_lstat64_args *args) 463 { 464 struct nlookupdata nd; 465 struct stat sb; 466 char *path; 467 int error; 468 469 error = linux_copyin_path(args->filename, &path, LINUX_PATH_EXISTS); 470 if (error) 471 return (error); 472 #ifdef DEBUG 473 if (ldebug(lstat64)) 474 kprintf(ARGS(lstat64, "%s, *"), path); 475 #endif 476 get_mplock(); 477 error = nlookup_init(&nd, path, UIO_SYSSPACE, 0); 478 if (error == 0) { 479 error = kern_stat(&nd, &sb); 480 nlookup_done(&nd); 481 } 482 rel_mplock(); 483 if (error == 0) 484 error = stat64_copyout(&sb, args->statbuf); 485 linux_free_path(&path); 486 return (error); 487 } 488 489 /* 490 * MPALMOSTSAFE 491 */ 492 int 493 sys_linux_fstat64(struct linux_fstat64_args *args) 494 { 495 struct stat buf; 496 int error; 497 498 #ifdef DEBUG 499 if (ldebug(fstat64)) 500 kprintf(ARGS(fstat64, "%d, *"), args->fd); 501 #endif 502 get_mplock(); 503 error = kern_fstat(args->fd, &buf); 504 rel_mplock(); 505 506 if (error == 0) 507 error = stat64_copyout(&buf, args->statbuf); 508 return (error); 509 } 510 511 int 512 sys_linux_fstatat64(struct linux_fstatat64_args *args) 513 { 514 struct nlookupdata nd; 515 struct file *fp; 516 struct stat st; 517 char *path; 518 int error, flags, dfd; 519 520 if (args->flag & ~LINUX_AT_SYMLINK_NOFOLLOW) 521 return (EINVAL); 522 523 error = linux_copyin_path(args->path, &path, LINUX_PATH_EXISTS); 524 if (error) 525 return (error); 526 #ifdef DEBUG 527 if (ldebug(fstatat64)) 528 kprintf(ARGS(fstatat64, "%s"), path); 529 #endif 530 dfd = (args->dfd == LINUX_AT_FDCWD) ? AT_FDCWD : args->dfd; 531 flags = (args->flag & LINUX_AT_SYMLINK_NOFOLLOW) ? 0 : NLC_FOLLOW; 532 533 error = nlookup_init_at(&nd, &fp, dfd, path, UIO_SYSSPACE, flags); 534 if (error == 0) { 535 error = kern_stat(&nd, &st); 536 if (error == 0) 537 error = stat64_copyout(&st, args->statbuf); 538 } 539 nlookup_done_at(&nd, fp); 540 linux_free_path(&path); 541 return (error); 542 } 543 544 int 545 sys_linux_ostat(struct linux_ostat_args *args) 546 { 547 struct nlookupdata nd; 548 struct stat buf; 549 char *path; 550 int error; 551 552 error = linux_copyin_path(args->path, &path, LINUX_PATH_EXISTS); 553 if (error) 554 return (error); 555 #ifdef DEBUG 556 if (ldebug(ostat)) 557 kprintf(ARGS(ostat, "%s, *"), path); 558 #endif 559 get_mplock(); 560 error = nlookup_init(&nd, path, UIO_SYSSPACE, NLC_FOLLOW); 561 if (error == 0) { 562 error = kern_stat(&nd, &buf); 563 nlookup_done(&nd); 564 } 565 rel_mplock(); 566 if (error == 0) 567 error = ostat_copyout(&buf, args->statbuf); 568 linux_free_path(&path); 569 return (error); 570 } 571 572 #endif /* __i386__ */
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