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 * $FreeBSD: releng/5.1/sys/compat/linux/linux_stats.c 114230 2003-04-29 17:03:22Z mbr $ 29 */ 30 31 #include "opt_mac.h" 32 33 #include <sys/param.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/mac.h> 40 #include <sys/malloc.h> 41 #include <sys/mount.h> 42 #include <sys/namei.h> 43 #include <sys/stat.h> 44 #include <sys/systm.h> 45 #include <sys/vnode.h> 46 47 #include <machine/../linux/linux.h> 48 #include <machine/../linux/linux_proto.h> 49 50 #include <compat/linux/linux_util.h> 51 52 static int 53 newstat_copyout(struct stat *buf, void *ubuf) 54 { 55 struct l_newstat tbuf; 56 struct cdevsw *cdevsw; 57 dev_t dev; 58 59 bzero(&tbuf, sizeof(tbuf)); 60 tbuf.st_dev = uminor(buf->st_dev) | (umajor(buf->st_dev) << 8); 61 tbuf.st_ino = buf->st_ino; 62 tbuf.st_mode = buf->st_mode; 63 tbuf.st_nlink = buf->st_nlink; 64 tbuf.st_uid = buf->st_uid; 65 tbuf.st_gid = buf->st_gid; 66 tbuf.st_rdev = buf->st_rdev; 67 tbuf.st_size = buf->st_size; 68 tbuf.st_atime = buf->st_atime; 69 tbuf.st_mtime = buf->st_mtime; 70 tbuf.st_ctime = buf->st_ctime; 71 tbuf.st_blksize = buf->st_blksize; 72 tbuf.st_blocks = buf->st_blocks; 73 74 /* Lie about disk drives which are character devices 75 * in FreeBSD but block devices under Linux. 76 */ 77 if (S_ISCHR(tbuf.st_mode) && 78 (dev = udev2dev(buf->st_rdev, 0)) != NODEV) { 79 cdevsw = devsw(dev); 80 if (cdevsw != NULL && (cdevsw->d_flags & D_DISK)) { 81 tbuf.st_mode &= ~S_IFMT; 82 tbuf.st_mode |= S_IFBLK; 83 84 /* XXX this may not be quite right */ 85 /* Map major number to 0 */ 86 tbuf.st_dev = uminor(buf->st_dev) & 0xf; 87 tbuf.st_rdev = buf->st_rdev & 0xff; 88 } 89 } 90 91 return (copyout(&tbuf, ubuf, sizeof(tbuf))); 92 } 93 94 int 95 linux_newstat(struct thread *td, struct linux_newstat_args *args) 96 { 97 struct stat buf; 98 struct nameidata nd; 99 char *path; 100 int error; 101 102 LCONVPATHEXIST(td, args->path, &path); 103 104 #ifdef DEBUG 105 if (ldebug(newstat)) 106 printf(ARGS(newstat, "%s, *"), path); 107 #endif 108 109 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | NOOBJ, UIO_SYSSPACE, path, td); 110 error = namei(&nd); 111 LFREEPATH(path); 112 if (error) 113 return (error); 114 NDFREE(&nd, NDF_ONLY_PNBUF); 115 116 error = vn_stat(nd.ni_vp, &buf, td->td_ucred, NOCRED, td); 117 vput(nd.ni_vp); 118 if (error) 119 return (error); 120 121 return (newstat_copyout(&buf, args->buf)); 122 } 123 124 int 125 linux_newlstat(struct thread *td, struct linux_newlstat_args *args) 126 { 127 int error; 128 struct stat sb; 129 struct nameidata nd; 130 char *path; 131 132 LCONVPATHEXIST(td, args->path, &path); 133 134 #ifdef DEBUG 135 if (ldebug(newlstat)) 136 printf(ARGS(newlstat, "%s, *"), path); 137 #endif 138 139 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF | NOOBJ, UIO_SYSSPACE, path, 140 td); 141 error = namei(&nd); 142 LFREEPATH(path); 143 if (error) 144 return (error); 145 NDFREE(&nd, NDF_ONLY_PNBUF); 146 147 error = vn_stat(nd.ni_vp, &sb, td->td_ucred, NOCRED, td); 148 vput(nd.ni_vp); 149 if (error) 150 return (error); 151 152 return (newstat_copyout(&sb, args->buf)); 153 } 154 155 int 156 linux_newfstat(struct thread *td, struct linux_newfstat_args *args) 157 { 158 struct file *fp; 159 struct stat buf; 160 int error; 161 162 #ifdef DEBUG 163 if (ldebug(newfstat)) 164 printf(ARGS(newfstat, "%d, *"), args->fd); 165 #endif 166 167 if ((error = fget(td, args->fd, &fp)) != 0) 168 return (error); 169 170 error = fo_stat(fp, &buf, td->td_ucred, td); 171 fdrop(fp, td); 172 if (!error) 173 error = newstat_copyout(&buf, args->buf); 174 175 return (error); 176 } 177 178 /* XXX - All fields of type l_int are defined as l_long on i386 */ 179 struct l_statfs { 180 l_int f_type; 181 l_int f_bsize; 182 l_int f_blocks; 183 l_int f_bfree; 184 l_int f_bavail; 185 l_int f_files; 186 l_int f_ffree; 187 l_fsid_t f_fsid; 188 l_int f_namelen; 189 l_int f_spare[6]; 190 }; 191 192 #define LINUX_CODA_SUPER_MAGIC 0x73757245L 193 #define LINUX_EXT2_SUPER_MAGIC 0xEF53L 194 #define LINUX_HPFS_SUPER_MAGIC 0xf995e849L 195 #define LINUX_ISOFS_SUPER_MAGIC 0x9660L 196 #define LINUX_MSDOS_SUPER_MAGIC 0x4d44L 197 #define LINUX_NCP_SUPER_MAGIC 0x564cL 198 #define LINUX_NFS_SUPER_MAGIC 0x6969L 199 #define LINUX_NTFS_SUPER_MAGIC 0x5346544EL 200 #define LINUX_PROC_SUPER_MAGIC 0x9fa0L 201 #define LINUX_UFS_SUPER_MAGIC 0x00011954L /* XXX - UFS_MAGIC in Linux */ 202 203 static long 204 bsd_to_linux_ftype(const char *fstypename) 205 { 206 int i; 207 static struct {const char *bsd_name; long linux_type;} b2l_tbl[] = { 208 {"ufs", LINUX_UFS_SUPER_MAGIC}, 209 {"cd9660", LINUX_ISOFS_SUPER_MAGIC}, 210 {"nfs", LINUX_NFS_SUPER_MAGIC}, 211 {"ext2fs", LINUX_EXT2_SUPER_MAGIC}, 212 {"procfs", LINUX_PROC_SUPER_MAGIC}, 213 {"msdosfs", LINUX_MSDOS_SUPER_MAGIC}, 214 {"ntfs", LINUX_NTFS_SUPER_MAGIC}, 215 {"nwfs", LINUX_NCP_SUPER_MAGIC}, 216 {"hpfs", LINUX_HPFS_SUPER_MAGIC}, 217 {"coda", LINUX_CODA_SUPER_MAGIC}, 218 {NULL, 0L}}; 219 220 for (i = 0; b2l_tbl[i].bsd_name != NULL; i++) 221 if (strcmp(b2l_tbl[i].bsd_name, fstypename) == 0) 222 return (b2l_tbl[i].linux_type); 223 224 return (0L); 225 } 226 227 int 228 linux_statfs(struct thread *td, struct linux_statfs_args *args) 229 { 230 struct mount *mp; 231 struct nameidata *ndp; 232 struct statfs *bsd_statfs; 233 struct nameidata nd; 234 struct l_statfs linux_statfs; 235 char *path; 236 int error; 237 238 LCONVPATHEXIST(td, args->path, &path); 239 240 #ifdef DEBUG 241 if (ldebug(statfs)) 242 printf(ARGS(statfs, "%s, *"), path); 243 #endif 244 ndp = &nd; 245 NDINIT(ndp, LOOKUP, FOLLOW, UIO_SYSSPACE, path, td); 246 error = namei(ndp); 247 LFREEPATH(path); 248 if (error) 249 return error; 250 NDFREE(ndp, NDF_ONLY_PNBUF); 251 mp = ndp->ni_vp->v_mount; 252 bsd_statfs = &mp->mnt_stat; 253 vrele(ndp->ni_vp); 254 #ifdef MAC 255 error = mac_check_mount_stat(td->td_ucred, mp); 256 if (error) 257 return (error); 258 #endif 259 error = VFS_STATFS(mp, bsd_statfs, td); 260 if (error) 261 return error; 262 bsd_statfs->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 263 linux_statfs.f_type = bsd_to_linux_ftype(bsd_statfs->f_fstypename); 264 linux_statfs.f_bsize = bsd_statfs->f_bsize; 265 linux_statfs.f_blocks = bsd_statfs->f_blocks; 266 linux_statfs.f_bfree = bsd_statfs->f_bfree; 267 linux_statfs.f_bavail = bsd_statfs->f_bavail; 268 linux_statfs.f_ffree = bsd_statfs->f_ffree; 269 linux_statfs.f_files = bsd_statfs->f_files; 270 linux_statfs.f_fsid.val[0] = bsd_statfs->f_fsid.val[0]; 271 linux_statfs.f_fsid.val[1] = bsd_statfs->f_fsid.val[1]; 272 linux_statfs.f_namelen = MAXNAMLEN; 273 return copyout(&linux_statfs, args->buf, sizeof(linux_statfs)); 274 } 275 276 int 277 linux_fstatfs(struct thread *td, struct linux_fstatfs_args *args) 278 { 279 struct file *fp; 280 struct mount *mp; 281 struct statfs *bsd_statfs; 282 struct l_statfs linux_statfs; 283 int error; 284 285 #ifdef DEBUG 286 if (ldebug(fstatfs)) 287 printf(ARGS(fstatfs, "%d, *"), args->fd); 288 #endif 289 error = getvnode(td->td_proc->p_fd, args->fd, &fp); 290 if (error) 291 return error; 292 mp = ((struct vnode *)fp->f_data)->v_mount; 293 #ifdef MAC 294 error = mac_check_mount_stat(td->td_ucred, mp); 295 if (error) { 296 fdrop(fp, td); 297 return (error); 298 } 299 #endif 300 bsd_statfs = &mp->mnt_stat; 301 error = VFS_STATFS(mp, bsd_statfs, td); 302 if (error) { 303 fdrop(fp, td); 304 return error; 305 } 306 bsd_statfs->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 307 linux_statfs.f_type = bsd_to_linux_ftype(bsd_statfs->f_fstypename); 308 linux_statfs.f_bsize = bsd_statfs->f_bsize; 309 linux_statfs.f_blocks = bsd_statfs->f_blocks; 310 linux_statfs.f_bfree = bsd_statfs->f_bfree; 311 linux_statfs.f_bavail = bsd_statfs->f_bavail; 312 linux_statfs.f_ffree = bsd_statfs->f_ffree; 313 linux_statfs.f_files = bsd_statfs->f_files; 314 linux_statfs.f_fsid.val[0] = bsd_statfs->f_fsid.val[0]; 315 linux_statfs.f_fsid.val[1] = bsd_statfs->f_fsid.val[1]; 316 linux_statfs.f_namelen = MAXNAMLEN; 317 error = copyout(&linux_statfs, args->buf, sizeof(linux_statfs)); 318 fdrop(fp, td); 319 return error; 320 } 321 322 struct l_ustat 323 { 324 l_daddr_t f_tfree; 325 l_ino_t f_tinode; 326 char f_fname[6]; 327 char f_fpack[6]; 328 }; 329 330 int 331 linux_ustat(struct thread *td, struct linux_ustat_args *args) 332 { 333 struct l_ustat lu; 334 dev_t dev; 335 struct vnode *vp; 336 struct statfs *stat; 337 int error; 338 339 #ifdef DEBUG 340 if (ldebug(ustat)) 341 printf(ARGS(ustat, "%d, *"), args->dev); 342 #endif 343 344 /* 345 * lu.f_fname and lu.f_fpack are not used. They are always zeroed. 346 * lu.f_tinode and lu.f_tfree are set from the device's super block. 347 */ 348 bzero(&lu, sizeof(lu)); 349 350 /* 351 * XXX - Don't return an error if we can't find a vnode for the 352 * device. Our dev_t is 32-bits whereas Linux only has a 16-bits 353 * dev_t. The dev_t that is used now may as well be a truncated 354 * dev_t returned from previous syscalls. Just return a bzeroed 355 * ustat in that case. 356 */ 357 dev = makedev(args->dev >> 8, args->dev & 0xFF); 358 if (vfinddev(dev, VCHR, &vp)) { 359 if (vp->v_mount == NULL) 360 return (EINVAL); 361 #ifdef MAC 362 error = mac_check_mount_stat(td->td_ucred, vp->v_mount); 363 if (error) 364 return (error); 365 #endif 366 stat = &(vp->v_mount->mnt_stat); 367 error = VFS_STATFS(vp->v_mount, stat, td); 368 if (error) 369 return (error); 370 371 lu.f_tfree = stat->f_bfree; 372 lu.f_tinode = stat->f_ffree; 373 } 374 375 return (copyout(&lu, args->ubuf, sizeof(lu))); 376 } 377 378 #if defined(__i386__) 379 380 static int 381 stat64_copyout(struct stat *buf, void *ubuf) 382 { 383 struct l_stat64 lbuf; 384 struct cdevsw *cdevsw; 385 dev_t dev; 386 387 bzero(&lbuf, sizeof(lbuf)); 388 lbuf.st_dev = uminor(buf->st_dev) | (umajor(buf->st_dev) << 8); 389 lbuf.st_ino = buf->st_ino; 390 lbuf.st_mode = buf->st_mode; 391 lbuf.st_nlink = buf->st_nlink; 392 lbuf.st_uid = buf->st_uid; 393 lbuf.st_gid = buf->st_gid; 394 lbuf.st_rdev = buf->st_rdev; 395 lbuf.st_size = buf->st_size; 396 lbuf.st_atime = buf->st_atime; 397 lbuf.st_mtime = buf->st_mtime; 398 lbuf.st_ctime = buf->st_ctime; 399 lbuf.st_blksize = buf->st_blksize; 400 lbuf.st_blocks = buf->st_blocks; 401 402 /* Lie about disk drives which are character devices 403 * in FreeBSD but block devices under Linux. 404 */ 405 if (S_ISCHR(lbuf.st_mode) && 406 (dev = udev2dev(buf->st_rdev, 0)) != NODEV) { 407 cdevsw = devsw(dev); 408 if (cdevsw != NULL && (cdevsw->d_flags & D_DISK)) { 409 lbuf.st_mode &= ~S_IFMT; 410 lbuf.st_mode |= S_IFBLK; 411 412 /* XXX this may not be quite right */ 413 /* Map major number to 0 */ 414 lbuf.st_dev = uminor(buf->st_dev) & 0xf; 415 lbuf.st_rdev = buf->st_rdev & 0xff; 416 } 417 } 418 419 /* 420 * The __st_ino field makes all the difference. In the Linux kernel 421 * it is conditionally compiled based on STAT64_HAS_BROKEN_ST_INO, 422 * but without the assignment to __st_ino the runtime linker refuses 423 * to mmap(2) any shared libraries. I guess it's broken alright :-) 424 */ 425 lbuf.__st_ino = buf->st_ino; 426 427 return (copyout(&lbuf, ubuf, sizeof(lbuf))); 428 } 429 430 int 431 linux_stat64(struct thread *td, struct linux_stat64_args *args) 432 { 433 struct stat buf; 434 struct nameidata nd; 435 int error; 436 char *filename; 437 438 LCONVPATHEXIST(td, args->filename, &filename); 439 440 #ifdef DEBUG 441 if (ldebug(stat64)) 442 printf(ARGS(stat64, "%s, *"), filename); 443 #endif 444 445 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | NOOBJ, UIO_SYSSPACE, filename, 446 td); 447 error = namei(&nd); 448 LFREEPATH(filename); 449 if (error) 450 return (error); 451 NDFREE(&nd, NDF_ONLY_PNBUF); 452 453 error = vn_stat(nd.ni_vp, &buf, td->td_ucred, NOCRED, td); 454 vput(nd.ni_vp); 455 if (error) 456 return (error); 457 458 return (stat64_copyout(&buf, args->statbuf)); 459 } 460 461 int 462 linux_lstat64(struct thread *td, struct linux_lstat64_args *args) 463 { 464 int error; 465 struct stat sb; 466 struct nameidata nd; 467 char *filename; 468 469 LCONVPATHEXIST(td, args->filename, &filename); 470 471 #ifdef DEBUG 472 if (ldebug(lstat64)) 473 printf(ARGS(lstat64, "%s, *"), args->filename); 474 #endif 475 476 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF | NOOBJ, UIO_SYSSPACE, filename, 477 td); 478 error = namei(&nd); 479 LFREEPATH(filename); 480 if (error) 481 return (error); 482 NDFREE(&nd, NDF_ONLY_PNBUF); 483 484 error = vn_stat(nd.ni_vp, &sb, td->td_ucred, NOCRED, td); 485 vput(nd.ni_vp); 486 if (error) 487 return (error); 488 489 return (stat64_copyout(&sb, args->statbuf)); 490 } 491 492 int 493 linux_fstat64(struct thread *td, struct linux_fstat64_args *args) 494 { 495 struct filedesc *fdp; 496 struct file *fp; 497 struct stat buf; 498 int error; 499 500 #ifdef DEBUG 501 if (ldebug(fstat64)) 502 printf(ARGS(fstat64, "%d, *"), args->fd); 503 #endif 504 505 fdp = td->td_proc->p_fd; 506 if ((unsigned)args->fd >= fdp->fd_nfiles || 507 (fp = fdp->fd_ofiles[args->fd]) == NULL) 508 return (EBADF); 509 510 error = fo_stat(fp, &buf, td->td_ucred, td); 511 if (!error) 512 error = stat64_copyout(&buf, args->statbuf); 513 514 return (error); 515 } 516 517 #endif /* __i386__ */
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