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
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD: src/sys/compat/linux/linux_stats.c,v 1.62.2.2 2005/04/23 21:57:43 ps Exp $");
31
32 #include "opt_mac.h"
33
34 #include <sys/param.h>
35 #include <sys/conf.h>
36 #include <sys/dirent.h>
37 #include <sys/file.h>
38 #include <sys/filedesc.h>
39 #include <sys/proc.h>
40 #include <sys/mac.h>
41 #include <sys/malloc.h>
42 #include <sys/mount.h>
43 #include <sys/namei.h>
44 #include <sys/stat.h>
45 #include <sys/syscallsubr.h>
46 #include <sys/systm.h>
47 #include <sys/vnode.h>
48
49 #include "opt_compat.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
61 static int
62 newstat_copyout(struct stat *buf, void *ubuf)
63 {
64 struct l_newstat tbuf;
65 struct cdevsw *cdevsw;
66 struct cdev *dev;
67
68 bzero(&tbuf, sizeof(tbuf));
69 tbuf.st_dev = uminor(buf->st_dev) | (umajor(buf->st_dev) << 8);
70 tbuf.st_ino = buf->st_ino;
71 tbuf.st_mode = buf->st_mode;
72 tbuf.st_nlink = buf->st_nlink;
73 tbuf.st_uid = buf->st_uid;
74 tbuf.st_gid = buf->st_gid;
75 tbuf.st_rdev = buf->st_rdev;
76 tbuf.st_size = buf->st_size;
77 tbuf.st_atime = buf->st_atime;
78 tbuf.st_mtime = buf->st_mtime;
79 tbuf.st_ctime = buf->st_ctime;
80 tbuf.st_blksize = buf->st_blksize;
81 tbuf.st_blocks = buf->st_blocks;
82
83 /* Lie about disk drives which are character devices
84 * in FreeBSD but block devices under Linux.
85 */
86 if (S_ISCHR(tbuf.st_mode) &&
87 (dev = findcdev(buf->st_rdev)) != NULL) {
88 cdevsw = devsw(dev);
89 if (cdevsw != NULL && (cdevsw->d_flags & D_DISK)) {
90 tbuf.st_mode &= ~S_IFMT;
91 tbuf.st_mode |= S_IFBLK;
92
93 /* XXX this may not be quite right */
94 /* Map major number to 0 */
95 tbuf.st_dev = uminor(buf->st_dev) & 0xf;
96 tbuf.st_rdev = buf->st_rdev & 0xff;
97 }
98 }
99
100 return (copyout(&tbuf, ubuf, sizeof(tbuf)));
101 }
102
103 int
104 linux_newstat(struct thread *td, struct linux_newstat_args *args)
105 {
106 struct stat buf;
107 char *path;
108 int error;
109
110 LCONVPATHEXIST(td, args->path, &path);
111
112 #ifdef DEBUG
113 if (ldebug(newstat))
114 printf(ARGS(newstat, "%s, *"), path);
115 #endif
116
117 error = kern_stat(td, path, UIO_SYSSPACE, &buf);
118 LFREEPATH(path);
119 if (error)
120 return (error);
121 return (newstat_copyout(&buf, args->buf));
122 }
123
124 int
125 linux_newlstat(struct thread *td, struct linux_newlstat_args *args)
126 {
127 struct stat sb;
128 char *path;
129 int error;
130
131 LCONVPATHEXIST(td, args->path, &path);
132
133 #ifdef DEBUG
134 if (ldebug(newlstat))
135 printf(ARGS(newlstat, "%s, *"), path);
136 #endif
137
138 error = kern_lstat(td, path, UIO_SYSSPACE, &sb);
139 LFREEPATH(path);
140 if (error)
141 return (error);
142 return (newstat_copyout(&sb, args->buf));
143 }
144
145 int
146 linux_newfstat(struct thread *td, struct linux_newfstat_args *args)
147 {
148 struct stat buf;
149 int error;
150
151 #ifdef DEBUG
152 if (ldebug(newfstat))
153 printf(ARGS(newfstat, "%d, *"), args->fd);
154 #endif
155
156 error = kern_fstat(td, args->fd, &buf);
157 if (!error)
158 error = newstat_copyout(&buf, args->buf);
159
160 return (error);
161 }
162
163 /* XXX - All fields of type l_int are defined as l_long on i386 */
164 struct l_statfs {
165 l_int f_type;
166 l_int f_bsize;
167 l_int f_blocks;
168 l_int f_bfree;
169 l_int f_bavail;
170 l_int f_files;
171 l_int f_ffree;
172 l_fsid_t f_fsid;
173 l_int f_namelen;
174 l_int f_spare[6];
175 };
176
177 #define LINUX_CODA_SUPER_MAGIC 0x73757245L
178 #define LINUX_EXT2_SUPER_MAGIC 0xEF53L
179 #define LINUX_HPFS_SUPER_MAGIC 0xf995e849L
180 #define LINUX_ISOFS_SUPER_MAGIC 0x9660L
181 #define LINUX_MSDOS_SUPER_MAGIC 0x4d44L
182 #define LINUX_NCP_SUPER_MAGIC 0x564cL
183 #define LINUX_NFS_SUPER_MAGIC 0x6969L
184 #define LINUX_NTFS_SUPER_MAGIC 0x5346544EL
185 #define LINUX_PROC_SUPER_MAGIC 0x9fa0L
186 #define LINUX_UFS_SUPER_MAGIC 0x00011954L /* XXX - UFS_MAGIC in Linux */
187
188 static long
189 bsd_to_linux_ftype(const char *fstypename)
190 {
191 int i;
192 static struct {const char *bsd_name; long linux_type;} b2l_tbl[] = {
193 {"ufs", LINUX_UFS_SUPER_MAGIC},
194 {"cd9660", LINUX_ISOFS_SUPER_MAGIC},
195 {"nfs", LINUX_NFS_SUPER_MAGIC},
196 {"ext2fs", LINUX_EXT2_SUPER_MAGIC},
197 {"procfs", LINUX_PROC_SUPER_MAGIC},
198 {"msdosfs", LINUX_MSDOS_SUPER_MAGIC},
199 {"ntfs", LINUX_NTFS_SUPER_MAGIC},
200 {"nwfs", LINUX_NCP_SUPER_MAGIC},
201 {"hpfs", LINUX_HPFS_SUPER_MAGIC},
202 {"coda", LINUX_CODA_SUPER_MAGIC},
203 {NULL, 0L}};
204
205 for (i = 0; b2l_tbl[i].bsd_name != NULL; i++)
206 if (strcmp(b2l_tbl[i].bsd_name, fstypename) == 0)
207 return (b2l_tbl[i].linux_type);
208
209 return (0L);
210 }
211
212 static void
213 bsd_to_linux_statfs(struct thread *td, struct statfs *bsd_statfs,
214 struct l_statfs *linux_statfs)
215 {
216
217 linux_statfs->f_type = bsd_to_linux_ftype(bsd_statfs->f_fstypename);
218 linux_statfs->f_bsize = bsd_statfs->f_bsize;
219 linux_statfs->f_blocks = bsd_statfs->f_blocks;
220 linux_statfs->f_bfree = bsd_statfs->f_bfree;
221 linux_statfs->f_bavail = bsd_statfs->f_bavail;
222 linux_statfs->f_ffree = bsd_statfs->f_ffree;
223 linux_statfs->f_files = bsd_statfs->f_files;
224 if (suser(td)) {
225 linux_statfs->f_fsid.val[0] = 0;
226 linux_statfs->f_fsid.val[1] = 0;
227 } else {
228 linux_statfs->f_fsid.val[0] = bsd_statfs->f_fsid.val[0];
229 linux_statfs->f_fsid.val[1] = bsd_statfs->f_fsid.val[1];
230 }
231 linux_statfs->f_namelen = MAXNAMLEN;
232 }
233
234 int
235 linux_statfs(struct thread *td, struct linux_statfs_args *args)
236 {
237 struct l_statfs linux_statfs;
238 struct statfs bsd_statfs;
239 char *path;
240 int error;
241
242 LCONVPATHEXIST(td, args->path, &path);
243
244 #ifdef DEBUG
245 if (ldebug(statfs))
246 printf(ARGS(statfs, "%s, *"), path);
247 #endif
248 error = kern_statfs(td, path, UIO_SYSSPACE, &bsd_statfs);
249 LFREEPATH(path);
250 if (error)
251 return (error);
252 bsd_to_linux_statfs(td, &bsd_statfs, &linux_statfs);
253 return copyout(&linux_statfs, args->buf, sizeof(linux_statfs));
254 }
255
256 int
257 linux_fstatfs(struct thread *td, struct linux_fstatfs_args *args)
258 {
259 struct l_statfs linux_statfs;
260 struct statfs bsd_statfs;
261 int error;
262
263 #ifdef DEBUG
264 if (ldebug(fstatfs))
265 printf(ARGS(fstatfs, "%d, *"), args->fd);
266 #endif
267 error = kern_fstatfs(td, args->fd, &bsd_statfs);
268 if (error)
269 return error;
270 bsd_to_linux_statfs(td, &bsd_statfs, &linux_statfs);
271 return copyout(&linux_statfs, args->buf, sizeof(linux_statfs));
272 }
273
274 struct l_ustat
275 {
276 l_daddr_t f_tfree;
277 l_ino_t f_tinode;
278 char f_fname[6];
279 char f_fpack[6];
280 };
281
282 int
283 linux_ustat(struct thread *td, struct linux_ustat_args *args)
284 {
285 struct l_ustat lu;
286 struct cdev *dev;
287 struct vnode *vp;
288 struct statfs *stat;
289 int error;
290
291 #ifdef DEBUG
292 if (ldebug(ustat))
293 printf(ARGS(ustat, "%d, *"), args->dev);
294 #endif
295
296 /*
297 * lu.f_fname and lu.f_fpack are not used. They are always zeroed.
298 * lu.f_tinode and lu.f_tfree are set from the device's super block.
299 */
300 bzero(&lu, sizeof(lu));
301
302 /*
303 * XXX - Don't return an error if we can't find a vnode for the
304 * device. Our struct cdev *is 32-bits whereas Linux only has a 16-bits
305 * struct cdev *. The struct cdev *that is used now may as well be a truncated
306 * struct cdev *returned from previous syscalls. Just return a bzeroed
307 * ustat in that case.
308 *
309 * XXX: findcdev() SHALL not be used this way. Somebody (TM) will
310 * have to find a better way. It may be that we should stick
311 * a dev_t into struct mount, and walk the mountlist for a
312 * perfect match and failing that try again looking for a
313 * minor-truncated match.
314 */
315 dev = findcdev(makedev(args->dev >> 8, args->dev & 0xFF));
316 if (dev != NULL && vfinddev(dev, &vp)) {
317 if (vp->v_mount == NULL)
318 return (EINVAL);
319 #ifdef MAC
320 error = mac_check_mount_stat(td->td_ucred, vp->v_mount);
321 if (error)
322 return (error);
323 #endif
324 stat = &(vp->v_mount->mnt_stat);
325 error = VFS_STATFS(vp->v_mount, stat, td);
326 if (error)
327 return (error);
328
329 lu.f_tfree = stat->f_bfree;
330 lu.f_tinode = stat->f_ffree;
331 }
332
333 return (copyout(&lu, args->ubuf, sizeof(lu)));
334 }
335
336 #if defined(__i386__) || (defined(__amd64__) && defined(COMPAT_LINUX32))
337
338 static int
339 stat64_copyout(struct stat *buf, void *ubuf)
340 {
341 struct l_stat64 lbuf;
342 struct cdevsw *cdevsw;
343 struct cdev *dev;
344
345 bzero(&lbuf, sizeof(lbuf));
346 lbuf.st_dev = uminor(buf->st_dev) | (umajor(buf->st_dev) << 8);
347 lbuf.st_ino = buf->st_ino;
348 lbuf.st_mode = buf->st_mode;
349 lbuf.st_nlink = buf->st_nlink;
350 lbuf.st_uid = buf->st_uid;
351 lbuf.st_gid = buf->st_gid;
352 lbuf.st_rdev = buf->st_rdev;
353 lbuf.st_size = buf->st_size;
354 lbuf.st_atime = buf->st_atime;
355 lbuf.st_mtime = buf->st_mtime;
356 lbuf.st_ctime = buf->st_ctime;
357 lbuf.st_blksize = buf->st_blksize;
358 lbuf.st_blocks = buf->st_blocks;
359
360 /* Lie about disk drives which are character devices
361 * in FreeBSD but block devices under Linux.
362 */
363 if (S_ISCHR(lbuf.st_mode) &&
364 (dev = findcdev(buf->st_rdev)) != NULL) {
365 cdevsw = devsw(dev);
366 if (cdevsw != NULL && (cdevsw->d_flags & D_DISK)) {
367 lbuf.st_mode &= ~S_IFMT;
368 lbuf.st_mode |= S_IFBLK;
369
370 /* XXX this may not be quite right */
371 /* Map major number to 0 */
372 lbuf.st_dev = uminor(buf->st_dev) & 0xf;
373 lbuf.st_rdev = buf->st_rdev & 0xff;
374 }
375 }
376
377 /*
378 * The __st_ino field makes all the difference. In the Linux kernel
379 * it is conditionally compiled based on STAT64_HAS_BROKEN_ST_INO,
380 * but without the assignment to __st_ino the runtime linker refuses
381 * to mmap(2) any shared libraries. I guess it's broken alright :-)
382 */
383 lbuf.__st_ino = buf->st_ino;
384
385 return (copyout(&lbuf, ubuf, sizeof(lbuf)));
386 }
387
388 int
389 linux_stat64(struct thread *td, struct linux_stat64_args *args)
390 {
391 struct stat buf;
392 char *filename;
393 int error;
394
395 LCONVPATHEXIST(td, args->filename, &filename);
396
397 #ifdef DEBUG
398 if (ldebug(stat64))
399 printf(ARGS(stat64, "%s, *"), filename);
400 #endif
401
402 error = kern_stat(td, filename, UIO_SYSSPACE, &buf);
403 LFREEPATH(filename);
404 if (error)
405 return (error);
406 return (stat64_copyout(&buf, args->statbuf));
407 }
408
409 int
410 linux_lstat64(struct thread *td, struct linux_lstat64_args *args)
411 {
412 struct stat sb;
413 char *filename;
414 int error;
415
416 LCONVPATHEXIST(td, args->filename, &filename);
417
418 #ifdef DEBUG
419 if (ldebug(lstat64))
420 printf(ARGS(lstat64, "%s, *"), args->filename);
421 #endif
422
423 error = kern_lstat(td, filename, UIO_SYSSPACE, &sb);
424 LFREEPATH(filename);
425 if (error)
426 return (error);
427 return (stat64_copyout(&sb, args->statbuf));
428 }
429
430 int
431 linux_fstat64(struct thread *td, struct linux_fstat64_args *args)
432 {
433 struct stat buf;
434 int error;
435
436 #ifdef DEBUG
437 if (ldebug(fstat64))
438 printf(ARGS(fstat64, "%d, *"), args->fd);
439 #endif
440
441 error = kern_fstat(td, args->fd, &buf);
442 if (!error)
443 error = stat64_copyout(&buf, args->statbuf);
444
445 return (error);
446 }
447
448 #endif /* __i386__ || (__amd64__ && COMPAT_LINUX32) */
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