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 withough 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 * $FreeBSD$ 29 */ 30 31 #include <sys/param.h> 32 #include <sys/conf.h> 33 #include <sys/dirent.h> 34 #include <sys/file.h> 35 #include <sys/filedesc.h> 36 #include <sys/proc.h> 37 #include <sys/mount.h> 38 #include <sys/namei.h> 39 #include <sys/stat.h> 40 #include <sys/sysctl.h> 41 #include <sys/systm.h> 42 #include <sys/vnode.h> 43 44 #include <machine/../linux/linux.h> 45 #include <machine/../linux/linux_proto.h> 46 #include <compat/linux/linux_util.h> 47 48 static int 49 newstat_copyout(struct stat *buf, void *ubuf) 50 { 51 struct l_newstat tbuf; 52 struct cdevsw *cdevsw; 53 dev_t dev; 54 55 tbuf.st_dev = uminor(buf->st_dev) | (umajor(buf->st_dev) << 8); 56 tbuf.st_ino = buf->st_ino; 57 tbuf.st_mode = buf->st_mode; 58 tbuf.st_nlink = buf->st_nlink; 59 tbuf.st_uid = buf->st_uid; 60 tbuf.st_gid = buf->st_gid; 61 tbuf.st_rdev = buf->st_rdev; 62 tbuf.st_size = buf->st_size; 63 tbuf.st_atime = buf->st_atime; 64 tbuf.st_mtime = buf->st_mtime; 65 tbuf.st_ctime = buf->st_ctime; 66 tbuf.st_blksize = buf->st_blksize; 67 tbuf.st_blocks = buf->st_blocks; 68 69 /* Lie about disk drives which are character devices 70 * in FreeBSD but block devices under Linux. 71 */ 72 if (S_ISCHR(tbuf.st_mode) && 73 (dev = udev2dev(buf->st_rdev, 0)) != NODEV) { 74 cdevsw = devsw(dev); 75 if (cdevsw != NULL && (cdevsw->d_flags & D_DISK)) { 76 tbuf.st_mode &= ~S_IFMT; 77 tbuf.st_mode |= S_IFBLK; 78 79 /* XXX this may not be quite right */ 80 /* Map major number to 0 */ 81 tbuf.st_dev = uminor(buf->st_dev) & 0xf; 82 tbuf.st_rdev = buf->st_rdev & 0xff; 83 } 84 } 85 86 return (copyout(&tbuf, ubuf, sizeof(tbuf))); 87 } 88 89 int 90 linux_newstat(struct proc *p, struct linux_newstat_args *args) 91 { 92 struct stat buf; 93 struct nameidata nd; 94 int error; 95 caddr_t sg; 96 97 sg = stackgap_init(); 98 CHECKALTEXIST(p, &sg, args->path); 99 100 #ifdef DEBUG 101 if (ldebug(newstat)) 102 printf(ARGS(newstat, "%s, *"), args->path); 103 #endif 104 105 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | NOOBJ, UIO_USERSPACE, 106 args->path, p); 107 error = namei(&nd); 108 if (error) 109 return (error); 110 NDFREE(&nd, NDF_ONLY_PNBUF); 111 112 error = vn_stat(nd.ni_vp, &buf, p); 113 vput(nd.ni_vp); 114 if (error) 115 return (error); 116 117 return (newstat_copyout(&buf, args->buf)); 118 } 119 120 int 121 linux_newlstat(struct proc *p, struct linux_newlstat_args *args) 122 { 123 int error; 124 struct stat sb; 125 struct nameidata nd; 126 caddr_t sg; 127 128 sg = stackgap_init(); 129 CHECKALTEXIST(p, &sg, args->path); 130 131 #ifdef DEBUG 132 if (ldebug(newlstat)) 133 printf(ARGS(newlstat, "%s, *"), args->path); 134 #endif 135 136 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF | NOOBJ, UIO_USERSPACE, 137 args->path, p); 138 error = namei(&nd); 139 if (error) 140 return (error); 141 NDFREE(&nd, NDF_ONLY_PNBUF); 142 143 error = vn_stat(nd.ni_vp, &sb, p); 144 vput(nd.ni_vp); 145 if (error) 146 return (error); 147 148 return (newstat_copyout(&sb, args->buf)); 149 } 150 151 int 152 linux_newfstat(struct proc *p, struct linux_newfstat_args *args) 153 { 154 struct filedesc *fdp; 155 struct file *fp; 156 struct stat buf; 157 int error; 158 159 #ifdef DEBUG 160 if (ldebug(newfstat)) 161 printf(ARGS(newfstat, "%d, *"), args->fd); 162 #endif 163 164 fdp = p->p_fd; 165 if ((unsigned)args->fd >= fdp->fd_nfiles || 166 (fp = fdp->fd_ofiles[args->fd]) == NULL) 167 return (EBADF); 168 169 error = fo_stat(fp, &buf, p); 170 if (!error) 171 error = newstat_copyout(&buf, args->buf); 172 173 return (error); 174 } 175 176 /* XXX - All fields of type l_int are defined as l_long on i386 */ 177 struct l_statfs { 178 l_int f_type; 179 l_int f_bsize; 180 l_int f_blocks; 181 l_int f_bfree; 182 l_int f_bavail; 183 l_int f_files; 184 l_int f_ffree; 185 l_fsid_t f_fsid; 186 l_int f_namelen; 187 l_int f_spare[6]; 188 }; 189 190 #define LINUX_CODA_SUPER_MAGIC 0x73757245L 191 #define LINUX_EXT2_SUPER_MAGIC 0xEF53L 192 #define LINUX_HPFS_SUPER_MAGIC 0xf995e849L 193 #define LINUX_ISOFS_SUPER_MAGIC 0x9660L 194 #define LINUX_MSDOS_SUPER_MAGIC 0x4d44L 195 #define LINUX_NCP_SUPER_MAGIC 0x564cL 196 #define LINUX_NFS_SUPER_MAGIC 0x6969L 197 #define LINUX_NTFS_SUPER_MAGIC 0x5346544EL 198 #define LINUX_PROC_SUPER_MAGIC 0x9fa0L 199 #define LINUX_UFS_SUPER_MAGIC 0x00011954L /* XXX - UFS_MAGIC in Linux */ 200 201 static long 202 bsd_to_linux_ftype(const char *fstypename) 203 { 204 int i; 205 static struct {const char *bsd_name; long linux_type;} b2l_tbl[] = { 206 {"ufs", LINUX_UFS_SUPER_MAGIC}, 207 {"cd9660", LINUX_ISOFS_SUPER_MAGIC}, 208 {"nfs", LINUX_NFS_SUPER_MAGIC}, 209 {"ext2fs", LINUX_EXT2_SUPER_MAGIC}, 210 {"procfs", LINUX_PROC_SUPER_MAGIC}, 211 {"msdosfs", LINUX_MSDOS_SUPER_MAGIC}, 212 {"ntfs", LINUX_NTFS_SUPER_MAGIC}, 213 {"nwfs", LINUX_NCP_SUPER_MAGIC}, 214 {"hpfs", LINUX_HPFS_SUPER_MAGIC}, 215 {"coda", LINUX_CODA_SUPER_MAGIC}, 216 {NULL, 0L}}; 217 218 for (i = 0; b2l_tbl[i].bsd_name != NULL; i++) 219 if (strcmp(b2l_tbl[i].bsd_name, fstypename) == 0) 220 return (b2l_tbl[i].linux_type); 221 222 return (0L); 223 } 224 225 int 226 linux_statfs(struct proc *p, struct linux_statfs_args *args) 227 { 228 struct mount *mp; 229 struct nameidata *ndp; 230 struct statfs *bsd_statfs; 231 struct nameidata nd; 232 struct l_statfs linux_statfs; 233 int error; 234 caddr_t sg; 235 236 sg = stackgap_init(); 237 CHECKALTEXIST(p, &sg, args->path); 238 239 #ifdef DEBUG 240 if (ldebug(statfs)) 241 printf(ARGS(statfs, "%s, *"), args->path); 242 #endif 243 ndp = &nd; 244 NDINIT(ndp, LOOKUP, FOLLOW, UIO_USERSPACE, args->path, curproc); 245 error = namei(ndp); 246 if (error) 247 return error; 248 NDFREE(ndp, NDF_ONLY_PNBUF); 249 mp = ndp->ni_vp->v_mount; 250 bsd_statfs = &mp->mnt_stat; 251 vrele(ndp->ni_vp); 252 error = VFS_STATFS(mp, bsd_statfs, p); 253 if (error) 254 return error; 255 bsd_statfs->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 256 linux_statfs.f_type = bsd_to_linux_ftype(bsd_statfs->f_fstypename); 257 linux_statfs.f_bsize = bsd_statfs->f_bsize; 258 linux_statfs.f_blocks = bsd_statfs->f_blocks; 259 linux_statfs.f_bfree = bsd_statfs->f_bfree; 260 linux_statfs.f_bavail = bsd_statfs->f_bavail; 261 linux_statfs.f_ffree = bsd_statfs->f_ffree; 262 linux_statfs.f_files = bsd_statfs->f_files; 263 if (suser(p)) { 264 linux_statfs.f_fsid.val[0] = 0; 265 linux_statfs.f_fsid.val[1] = 0; 266 } else { 267 linux_statfs.f_fsid.val[0] = bsd_statfs->f_fsid.val[0]; 268 linux_statfs.f_fsid.val[1] = bsd_statfs->f_fsid.val[1]; 269 } 270 linux_statfs.f_namelen = MAXNAMLEN; 271 return copyout((caddr_t)&linux_statfs, (caddr_t)args->buf, 272 sizeof(linux_statfs)); 273 } 274 275 int 276 linux_fstatfs(struct proc *p, struct linux_fstatfs_args *args) 277 { 278 struct file *fp; 279 struct mount *mp; 280 struct statfs *bsd_statfs; 281 struct l_statfs linux_statfs; 282 int error; 283 284 #ifdef DEBUG 285 if (ldebug(fstatfs)) 286 printf(ARGS(fstatfs, "%d, *"), args->fd); 287 #endif 288 error = getvnode(p->p_fd, args->fd, &fp); 289 if (error) 290 return error; 291 mp = ((struct vnode *)fp->f_data)->v_mount; 292 bsd_statfs = &mp->mnt_stat; 293 error = VFS_STATFS(mp, bsd_statfs, p); 294 if (error) 295 return error; 296 bsd_statfs->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 297 linux_statfs.f_type = bsd_to_linux_ftype(bsd_statfs->f_fstypename); 298 linux_statfs.f_bsize = bsd_statfs->f_bsize; 299 linux_statfs.f_blocks = bsd_statfs->f_blocks; 300 linux_statfs.f_bfree = bsd_statfs->f_bfree; 301 linux_statfs.f_bavail = bsd_statfs->f_bavail; 302 linux_statfs.f_ffree = bsd_statfs->f_ffree; 303 linux_statfs.f_files = bsd_statfs->f_files; 304 if (suser(p)) { 305 linux_statfs.f_fsid.val[0] = 0; 306 linux_statfs.f_fsid.val[1] = 0; 307 } else { 308 linux_statfs.f_fsid.val[0] = bsd_statfs->f_fsid.val[0]; 309 linux_statfs.f_fsid.val[1] = bsd_statfs->f_fsid.val[1]; 310 } 311 linux_statfs.f_namelen = MAXNAMLEN; 312 return copyout((caddr_t)&linux_statfs, (caddr_t)args->buf, 313 sizeof(linux_statfs)); 314 } 315 316 struct l_ustat 317 { 318 l_daddr_t f_tfree; 319 l_ino_t f_tinode; 320 char f_fname[6]; 321 char f_fpack[6]; 322 }; 323 324 int 325 linux_ustat(struct proc *p, struct linux_ustat_args *args) 326 { 327 struct l_ustat lu; 328 dev_t dev; 329 struct vnode *vp; 330 struct statfs *stat; 331 int error; 332 333 #ifdef DEBUG 334 if (ldebug(ustat)) 335 printf(ARGS(ustat, "%d, *"), args->dev); 336 #endif 337 338 /* 339 * lu.f_fname and lu.f_fpack are not used. They are always zeroed. 340 * lu.f_tinode and lu.f_tfree are set from the device's super block. 341 */ 342 bzero(&lu, sizeof(lu)); 343 344 /* 345 * XXX - Don't return an error if we can't find a vnode for the 346 * device. Our dev_t is 32-bits whereas Linux only has a 16-bits 347 * dev_t. The dev_t that is used now may as well be a truncated 348 * dev_t returned from previous syscalls. Just return a bzeroed 349 * ustat in that case. 350 */ 351 dev = makedev(args->dev >> 8, args->dev & 0xFF); 352 if (vfinddev(dev, VCHR, &vp)) { 353 if (vp->v_mount == NULL) 354 return (EINVAL); 355 stat = &(vp->v_mount->mnt_stat); 356 error = VFS_STATFS(vp->v_mount, stat, p); 357 if (error) 358 return (error); 359 360 lu.f_tfree = stat->f_bfree; 361 lu.f_tinode = stat->f_ffree; 362 } 363 364 return (copyout(&lu, args->ubuf, sizeof(lu))); 365 } 366 367 #if defined(__i386__) 368 369 static int 370 stat64_copyout(struct stat *buf, void *ubuf) 371 { 372 struct l_stat64 lbuf; 373 374 bzero(&lbuf, sizeof(lbuf)); 375 lbuf.st_dev = uminor(buf->st_dev) | (umajor(buf->st_dev) << 8); 376 lbuf.st_ino = buf->st_ino; 377 lbuf.st_mode = buf->st_mode; 378 lbuf.st_nlink = buf->st_nlink; 379 lbuf.st_uid = buf->st_uid; 380 lbuf.st_gid = buf->st_gid; 381 lbuf.st_rdev = buf->st_rdev; 382 lbuf.st_size = buf->st_size; 383 lbuf.st_atime = buf->st_atime; 384 lbuf.st_mtime = buf->st_mtime; 385 lbuf.st_ctime = buf->st_ctime; 386 lbuf.st_blksize = buf->st_blksize; 387 lbuf.st_blocks = buf->st_blocks; 388 389 /* 390 * The __st_ino field makes all the difference. In the Linux kernel 391 * it is conditionally compiled based on STAT64_HAS_BROKEN_ST_INO, 392 * but without the assignment to __st_ino the runtime linker refuses 393 * to mmap(2) any shared libraries. I guess it's broken alright :-) 394 */ 395 lbuf.__st_ino = buf->st_ino; 396 397 return (copyout(&lbuf, ubuf, sizeof(lbuf))); 398 } 399 400 int 401 linux_stat64(struct proc *p, struct linux_stat64_args *args) 402 { 403 struct stat buf; 404 struct nameidata nd; 405 int error; 406 caddr_t sg; 407 408 sg = stackgap_init(); 409 CHECKALTEXIST(p, &sg, args->filename); 410 411 #ifdef DEBUG 412 if (ldebug(stat64)) 413 printf(ARGS(stat64, "%s, *"), args->filename); 414 #endif 415 416 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | NOOBJ, UIO_USERSPACE, 417 args->filename, p); 418 error = namei(&nd); 419 if (error) 420 return (error); 421 NDFREE(&nd, NDF_ONLY_PNBUF); 422 423 error = vn_stat(nd.ni_vp, &buf, p); 424 vput(nd.ni_vp); 425 if (error) 426 return (error); 427 428 return (stat64_copyout(&buf, args->statbuf)); 429 } 430 431 int 432 linux_lstat64(struct proc *p, struct linux_lstat64_args *args) 433 { 434 int error; 435 struct stat sb; 436 struct nameidata nd; 437 caddr_t sg; 438 439 sg = stackgap_init(); 440 CHECKALTEXIST(p, &sg, args->filename); 441 442 #ifdef DEBUG 443 if (ldebug(lstat64)) 444 printf(ARGS(lstat64, "%s, *"), args->filename); 445 #endif 446 447 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF | NOOBJ, UIO_USERSPACE, 448 args->filename, p); 449 error = namei(&nd); 450 if (error) 451 return (error); 452 NDFREE(&nd, NDF_ONLY_PNBUF); 453 454 error = vn_stat(nd.ni_vp, &sb, p); 455 vput(nd.ni_vp); 456 if (error) 457 return (error); 458 459 return (stat64_copyout(&sb, args->statbuf)); 460 } 461 462 int 463 linux_fstat64(struct proc *p, struct linux_fstat64_args *args) 464 { 465 struct filedesc *fdp; 466 struct file *fp; 467 struct stat buf; 468 int error; 469 470 #ifdef DEBUG 471 if (ldebug(fstat64)) 472 printf(ARGS(fstat64, "%d, *"), args->fd); 473 #endif 474 475 fdp = p->p_fd; 476 if ((unsigned)args->fd >= fdp->fd_nfiles || 477 (fp = fdp->fd_ofiles[args->fd]) == NULL) 478 return (EBADF); 479 480 error = fo_stat(fp, &buf, p); 481 if (!error) 482 error = stat64_copyout(&buf, args->statbuf); 483 484 return (error); 485 } 486 487 #endif /* __i386__ */
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