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: releng/6.0/sys/compat/linux/linux_stats.c 147559 2005-06-23 22:13:29Z pjd $");
31
32 #include "opt_mac.h"
33
34 #include <sys/param.h>
35 #include <sys/dirent.h>
36 #include <sys/file.h>
37 #include <sys/filedesc.h>
38 #include <sys/proc.h>
39 #include <sys/jail.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 /*
62 * XXX: This was removed from newstat_copyout(), and almost identical
63 * XXX: code was in stat64_copyout(). findcdev() needs to be replaced
64 * XXX: with something that does lookup and locking properly.
65 * XXX: When somebody fixes this: please try to avoid duplicating it.
66 */
67 #if 0
68 static void
69 disk_foo(struct somestat *tbuf)
70 {
71 struct cdevsw *cdevsw;
72 struct cdev *dev;
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 = findcdev(buf->st_rdev)) != NULL) {
79 cdevsw = dev_refthread(dev);
80 if (cdevsw != NULL) {
81 if (cdevsw->d_flags & D_DISK) {
82 tbuf.st_mode &= ~S_IFMT;
83 tbuf.st_mode |= S_IFBLK;
84
85 /* XXX this may not be quite right */
86 /* Map major number to 0 */
87 tbuf.st_dev = uminor(buf->st_dev) & 0xf;
88 tbuf.st_rdev = buf->st_rdev & 0xff;
89 }
90 dev_relthread(dev);
91 }
92 }
93
94 }
95 #endif
96
97 static int
98 newstat_copyout(struct stat *buf, void *ubuf)
99 {
100 struct l_newstat tbuf;
101
102 bzero(&tbuf, sizeof(tbuf));
103 tbuf.st_dev = uminor(buf->st_dev) | (umajor(buf->st_dev) << 8);
104 tbuf.st_ino = buf->st_ino;
105 tbuf.st_mode = buf->st_mode;
106 tbuf.st_nlink = buf->st_nlink;
107 tbuf.st_uid = buf->st_uid;
108 tbuf.st_gid = buf->st_gid;
109 tbuf.st_rdev = buf->st_rdev;
110 tbuf.st_size = buf->st_size;
111 tbuf.st_atime = buf->st_atime;
112 tbuf.st_mtime = buf->st_mtime;
113 tbuf.st_ctime = buf->st_ctime;
114 tbuf.st_blksize = buf->st_blksize;
115 tbuf.st_blocks = buf->st_blocks;
116
117 return (copyout(&tbuf, ubuf, sizeof(tbuf)));
118 }
119
120 int
121 linux_newstat(struct thread *td, struct linux_newstat_args *args)
122 {
123 struct stat buf;
124 char *path;
125 int error;
126
127 LCONVPATHEXIST(td, args->path, &path);
128
129 #ifdef DEBUG
130 if (ldebug(newstat))
131 printf(ARGS(newstat, "%s, *"), path);
132 #endif
133
134 error = kern_stat(td, path, UIO_SYSSPACE, &buf);
135 LFREEPATH(path);
136 if (error)
137 return (error);
138 return (newstat_copyout(&buf, args->buf));
139 }
140
141 int
142 linux_newlstat(struct thread *td, struct linux_newlstat_args *args)
143 {
144 struct stat sb;
145 char *path;
146 int error;
147
148 LCONVPATHEXIST(td, args->path, &path);
149
150 #ifdef DEBUG
151 if (ldebug(newlstat))
152 printf(ARGS(newlstat, "%s, *"), path);
153 #endif
154
155 error = kern_lstat(td, path, UIO_SYSSPACE, &sb);
156 LFREEPATH(path);
157 if (error)
158 return (error);
159 return (newstat_copyout(&sb, args->buf));
160 }
161
162 int
163 linux_newfstat(struct thread *td, struct linux_newfstat_args *args)
164 {
165 struct stat buf;
166 int error;
167
168 #ifdef DEBUG
169 if (ldebug(newfstat))
170 printf(ARGS(newfstat, "%d, *"), args->fd);
171 #endif
172
173 error = kern_fstat(td, args->fd, &buf);
174 if (!error)
175 error = newstat_copyout(&buf, args->buf);
176
177 return (error);
178 }
179
180 /* XXX - All fields of type l_int are defined as l_long on i386 */
181 struct l_statfs {
182 l_int f_type;
183 l_int f_bsize;
184 l_int f_blocks;
185 l_int f_bfree;
186 l_int f_bavail;
187 l_int f_files;
188 l_int f_ffree;
189 l_fsid_t f_fsid;
190 l_int f_namelen;
191 l_int f_spare[6];
192 };
193
194 #define LINUX_CODA_SUPER_MAGIC 0x73757245L
195 #define LINUX_EXT2_SUPER_MAGIC 0xEF53L
196 #define LINUX_HPFS_SUPER_MAGIC 0xf995e849L
197 #define LINUX_ISOFS_SUPER_MAGIC 0x9660L
198 #define LINUX_MSDOS_SUPER_MAGIC 0x4d44L
199 #define LINUX_NCP_SUPER_MAGIC 0x564cL
200 #define LINUX_NFS_SUPER_MAGIC 0x6969L
201 #define LINUX_NTFS_SUPER_MAGIC 0x5346544EL
202 #define LINUX_PROC_SUPER_MAGIC 0x9fa0L
203 #define LINUX_UFS_SUPER_MAGIC 0x00011954L /* XXX - UFS_MAGIC in Linux */
204
205 static long
206 bsd_to_linux_ftype(const char *fstypename)
207 {
208 int i;
209 static struct {const char *bsd_name; long linux_type;} b2l_tbl[] = {
210 {"ufs", LINUX_UFS_SUPER_MAGIC},
211 {"cd9660", LINUX_ISOFS_SUPER_MAGIC},
212 {"nfs", LINUX_NFS_SUPER_MAGIC},
213 {"ext2fs", LINUX_EXT2_SUPER_MAGIC},
214 {"procfs", LINUX_PROC_SUPER_MAGIC},
215 {"msdosfs", LINUX_MSDOS_SUPER_MAGIC},
216 {"ntfs", LINUX_NTFS_SUPER_MAGIC},
217 {"nwfs", LINUX_NCP_SUPER_MAGIC},
218 {"hpfs", LINUX_HPFS_SUPER_MAGIC},
219 {"coda", LINUX_CODA_SUPER_MAGIC},
220 {NULL, 0L}};
221
222 for (i = 0; b2l_tbl[i].bsd_name != NULL; i++)
223 if (strcmp(b2l_tbl[i].bsd_name, fstypename) == 0)
224 return (b2l_tbl[i].linux_type);
225
226 return (0L);
227 }
228
229 static void
230 bsd_to_linux_statfs(struct statfs *bsd_statfs, struct l_statfs *linux_statfs)
231 {
232
233 linux_statfs->f_type = bsd_to_linux_ftype(bsd_statfs->f_fstypename);
234 linux_statfs->f_bsize = bsd_statfs->f_bsize;
235 linux_statfs->f_blocks = bsd_statfs->f_blocks;
236 linux_statfs->f_bfree = bsd_statfs->f_bfree;
237 linux_statfs->f_bavail = bsd_statfs->f_bavail;
238 linux_statfs->f_ffree = bsd_statfs->f_ffree;
239 linux_statfs->f_files = bsd_statfs->f_files;
240 linux_statfs->f_fsid.val[0] = bsd_statfs->f_fsid.val[0];
241 linux_statfs->f_fsid.val[1] = bsd_statfs->f_fsid.val[1];
242 linux_statfs->f_namelen = MAXNAMLEN;
243 }
244
245 int
246 linux_statfs(struct thread *td, struct linux_statfs_args *args)
247 {
248 struct l_statfs linux_statfs;
249 struct statfs bsd_statfs;
250 char *path;
251 int error;
252
253 LCONVPATHEXIST(td, args->path, &path);
254
255 #ifdef DEBUG
256 if (ldebug(statfs))
257 printf(ARGS(statfs, "%s, *"), path);
258 #endif
259 error = kern_statfs(td, path, UIO_SYSSPACE, &bsd_statfs);
260 LFREEPATH(path);
261 if (error)
262 return (error);
263 bsd_to_linux_statfs(&bsd_statfs, &linux_statfs);
264 return copyout(&linux_statfs, args->buf, sizeof(linux_statfs));
265 }
266
267 int
268 linux_fstatfs(struct thread *td, struct linux_fstatfs_args *args)
269 {
270 struct l_statfs linux_statfs;
271 struct statfs bsd_statfs;
272 int error;
273
274 #ifdef DEBUG
275 if (ldebug(fstatfs))
276 printf(ARGS(fstatfs, "%d, *"), args->fd);
277 #endif
278 error = kern_fstatfs(td, args->fd, &bsd_statfs);
279 if (error)
280 return error;
281 bsd_to_linux_statfs(&bsd_statfs, &linux_statfs);
282 return copyout(&linux_statfs, args->buf, sizeof(linux_statfs));
283 }
284
285 struct l_ustat
286 {
287 l_daddr_t f_tfree;
288 l_ino_t f_tinode;
289 char f_fname[6];
290 char f_fpack[6];
291 };
292
293 int
294 linux_ustat(struct thread *td, struct linux_ustat_args *args)
295 {
296 #ifdef DEBUG
297 if (ldebug(ustat))
298 printf(ARGS(ustat, "%d, *"), args->dev);
299 #endif
300
301 return (EOPNOTSUPP);
302
303 #ifdef not_that_way
304 struct l_ustat lu;
305 struct cdev *dev;
306 struct vnode *vp;
307 struct statfs *stat;
308 int error;
309
310
311 /*
312 * lu.f_fname and lu.f_fpack are not used. They are always zeroed.
313 * lu.f_tinode and lu.f_tfree are set from the device's super block.
314 */
315 bzero(&lu, sizeof(lu));
316
317 /*
318 * XXX - Don't return an error if we can't find a vnode for the
319 * device. Our struct cdev *is 32-bits whereas Linux only has a 16-bits
320 * struct cdev *. The struct cdev *that is used now may as well be a truncated
321 * struct cdev *returned from previous syscalls. Just return a bzeroed
322 * ustat in that case.
323 *
324 * XXX: findcdev() SHALL not be used this way. Somebody (TM) will
325 * have to find a better way. It may be that we should stick
326 * a dev_t into struct mount, and walk the mountlist for a
327 * perfect match and failing that try again looking for a
328 * minor-truncated match.
329 */
330 dev = findcdev(makedev(args->dev >> 8, args->dev & 0xFF));
331 if (dev != NULL && vfinddev(dev, &vp)) {
332 if (vp->v_mount == NULL)
333 return (EINVAL);
334 #ifdef MAC
335 error = mac_check_mount_stat(td->td_ucred, vp->v_mount);
336 if (error)
337 return (error);
338 #endif
339 stat = &(vp->v_mount->mnt_stat);
340 error = VFS_STATFS(vp->v_mount, stat, td);
341 if (error)
342 return (error);
343
344 lu.f_tfree = stat->f_bfree;
345 lu.f_tinode = stat->f_ffree;
346 }
347
348 return (copyout(&lu, args->ubuf, sizeof(lu)));
349 #endif
350 }
351
352 #if defined(__i386__) || (defined(__amd64__) && defined(COMPAT_LINUX32))
353
354 static int
355 stat64_copyout(struct stat *buf, void *ubuf)
356 {
357 struct l_stat64 lbuf;
358
359 bzero(&lbuf, sizeof(lbuf));
360 lbuf.st_dev = uminor(buf->st_dev) | (umajor(buf->st_dev) << 8);
361 lbuf.st_ino = buf->st_ino;
362 lbuf.st_mode = buf->st_mode;
363 lbuf.st_nlink = buf->st_nlink;
364 lbuf.st_uid = buf->st_uid;
365 lbuf.st_gid = buf->st_gid;
366 lbuf.st_rdev = buf->st_rdev;
367 lbuf.st_size = buf->st_size;
368 lbuf.st_atime = buf->st_atime;
369 lbuf.st_mtime = buf->st_mtime;
370 lbuf.st_ctime = buf->st_ctime;
371 lbuf.st_blksize = buf->st_blksize;
372 lbuf.st_blocks = buf->st_blocks;
373
374 /*
375 * The __st_ino field makes all the difference. In the Linux kernel
376 * it is conditionally compiled based on STAT64_HAS_BROKEN_ST_INO,
377 * but without the assignment to __st_ino the runtime linker refuses
378 * to mmap(2) any shared libraries. I guess it's broken alright :-)
379 */
380 lbuf.__st_ino = buf->st_ino;
381
382 return (copyout(&lbuf, ubuf, sizeof(lbuf)));
383 }
384
385 int
386 linux_stat64(struct thread *td, struct linux_stat64_args *args)
387 {
388 struct stat buf;
389 char *filename;
390 int error;
391
392 LCONVPATHEXIST(td, args->filename, &filename);
393
394 #ifdef DEBUG
395 if (ldebug(stat64))
396 printf(ARGS(stat64, "%s, *"), filename);
397 #endif
398
399 error = kern_stat(td, filename, UIO_SYSSPACE, &buf);
400 LFREEPATH(filename);
401 if (error)
402 return (error);
403 return (stat64_copyout(&buf, args->statbuf));
404 }
405
406 int
407 linux_lstat64(struct thread *td, struct linux_lstat64_args *args)
408 {
409 struct stat sb;
410 char *filename;
411 int error;
412
413 LCONVPATHEXIST(td, args->filename, &filename);
414
415 #ifdef DEBUG
416 if (ldebug(lstat64))
417 printf(ARGS(lstat64, "%s, *"), args->filename);
418 #endif
419
420 error = kern_lstat(td, filename, UIO_SYSSPACE, &sb);
421 LFREEPATH(filename);
422 if (error)
423 return (error);
424 return (stat64_copyout(&sb, args->statbuf));
425 }
426
427 int
428 linux_fstat64(struct thread *td, struct linux_fstat64_args *args)
429 {
430 struct stat buf;
431 int error;
432
433 #ifdef DEBUG
434 if (ldebug(fstat64))
435 printf(ARGS(fstat64, "%d, *"), args->fd);
436 #endif
437
438 error = kern_fstat(td, args->fd, &buf);
439 if (!error)
440 error = stat64_copyout(&buf, args->statbuf);
441
442 return (error);
443 }
444
445 #endif /* __i386__ || (__amd64__ && COMPAT_LINUX32) */
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