xref: /freebsd/sys/compat/linux/linux_stats.c (revision 87569f75a91f298c52a71823c04d41cf53c88889) 
1 /*-
2  * Copyright (c) 1994-1995 S�ren 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("$FreeBSD$");
31 
32 #include "opt_compat.h"
33 #include "opt_mac.h"
34 
35 #include <sys/param.h>
36 #include <sys/dirent.h>
37 #include <sys/file.h>
38 #include <sys/filedesc.h>
39 #include <sys/proc.h>
40 #include <sys/jail.h>
41 #include <sys/mac.h>
42 #include <sys/malloc.h>
43 #include <sys/mount.h>
44 #include <sys/namei.h>
45 #include <sys/stat.h>
46 #include <sys/syscallsubr.h>
47 #include <sys/systm.h>
48 #include <sys/vnode.h>
49 
50 #ifdef COMPAT_LINUX32
51 #include <machine/../linux32/linux.h>
52 #include <machine/../linux32/linux32_proto.h>
53 #else
54 #include <machine/../linux/linux.h>
55 #include <machine/../linux/linux_proto.h>
56 #endif
57 
58 #include <compat/linux/linux_util.h>
59 
60 /*
61  * XXX: This was removed from newstat_copyout(), and almost identical
62  * XXX: code was in stat64_copyout().  findcdev() needs to be replaced
63  * XXX: with something that does lookup and locking properly.
64  * XXX: When somebody fixes this: please try to avoid duplicating it.
65  */
66 #if 0
67 static void
68 disk_foo(struct somestat *tbuf)
69 {
70 	struct cdevsw *cdevsw;
71 	struct cdev *dev;
72 
73 	/* Lie about disk drives which are character devices
74 	 * in FreeBSD but block devices under Linux.
75 	 */
76 	if (S_ISCHR(tbuf.st_mode) &&
77 	    (dev = findcdev(buf->st_rdev)) != NULL) {
78 		cdevsw = dev_refthread(dev);
79 		if (cdevsw != NULL) {
80 			if (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 			dev_relthread(dev);
90 		}
91 	}
92 
93 }
94 #endif
95 
96 static int
97 newstat_copyout(struct stat *buf, void *ubuf)
98 {
99 	struct l_newstat tbuf;
100 
101 	bzero(&tbuf, sizeof(tbuf));
102 	tbuf.st_dev = uminor(buf->st_dev) | (umajor(buf->st_dev) << 8);
103 	tbuf.st_ino = buf->st_ino;
104 	tbuf.st_mode = buf->st_mode;
105 	tbuf.st_nlink = buf->st_nlink;
106 	tbuf.st_uid = buf->st_uid;
107 	tbuf.st_gid = buf->st_gid;
108 	tbuf.st_rdev = buf->st_rdev;
109 	tbuf.st_size = buf->st_size;
110 	tbuf.st_atime = buf->st_atime;
111 	tbuf.st_mtime = buf->st_mtime;
112 	tbuf.st_ctime = buf->st_ctime;
113 	tbuf.st_blksize = buf->st_blksize;
114 	tbuf.st_blocks = buf->st_blocks;
115 
116 	return (copyout(&tbuf, ubuf, sizeof(tbuf)));
117 }
118 
119 int
120 linux_newstat(struct thread *td, struct linux_newstat_args *args)
121 {
122 	struct stat buf;
123 	char *path;
124 	int error;
125 
126 	LCONVPATHEXIST(td, args->path, &path);
127 
128 #ifdef DEBUG
129 	if (ldebug(newstat))
130 		printf(ARGS(newstat, "%s, *"), path);
131 #endif
132 
133 	error = kern_stat(td, path, UIO_SYSSPACE, &buf);
134 	  if (!error && strlen(path) > strlen("/dev/pts/") &&
135 	      !strncmp(path, "/dev/pts/", strlen("/dev/pts/"))
136 	      && path[9] >= '0' && path[9] <= '9') {
137 		  /*
138    		   * Linux checks major and minors of the slave device to make
139 		   * sure it's a pty device, so let's make him believe it is.
140 		   */
141 		  buf.st_rdev = (136 << 8);
142 	  }
143 
144 	LFREEPATH(path);
145 	if (error)
146 		return (error);
147 	return (newstat_copyout(&buf, args->buf));
148 }
149 
150 int
151 linux_newlstat(struct thread *td, struct linux_newlstat_args *args)
152 {
153 	struct stat sb;
154 	char *path;
155 	int error;
156 
157 	LCONVPATHEXIST(td, args->path, &path);
158 
159 #ifdef DEBUG
160 	if (ldebug(newlstat))
161 		printf(ARGS(newlstat, "%s, *"), path);
162 #endif
163 
164 	error = kern_lstat(td, path, UIO_SYSSPACE, &sb);
165 	LFREEPATH(path);
166 	if (error)
167 		return (error);
168 	return (newstat_copyout(&sb, args->buf));
169 }
170 
171 int
172 linux_newfstat(struct thread *td, struct linux_newfstat_args *args)
173 {
174 	struct stat buf;
175 	int error;
176 
177 #ifdef DEBUG
178 	if (ldebug(newfstat))
179 		printf(ARGS(newfstat, "%d, *"), args->fd);
180 #endif
181 
182 	error = kern_fstat(td, args->fd, &buf);
183 	if (!error)
184 		error = newstat_copyout(&buf, args->buf);
185 
186 	return (error);
187 }
188 
189 static int
190 stat_copyout(struct stat *buf, void *ubuf)
191 {
192 	struct l_stat lbuf;
193 
194 	bzero(&lbuf, sizeof(lbuf));
195 	lbuf.st_dev = buf->st_dev;
196 	lbuf.st_ino = buf->st_ino;
197 	lbuf.st_mode = buf->st_mode;
198 	lbuf.st_nlink = buf->st_nlink;
199 	lbuf.st_uid = buf->st_uid;
200 	lbuf.st_gid = buf->st_gid;
201 	lbuf.st_rdev = buf->st_rdev;
202 	if (buf->st_size < (quad_t)1 << 32)
203 		lbuf.st_size = buf->st_size;
204 	else
205 		lbuf.st_size = -2;
206 	lbuf.st_atime = buf->st_atime;
207 	lbuf.st_mtime = buf->st_mtime;
208 	lbuf.st_ctime = buf->st_ctime;
209 	lbuf.st_blksize = buf->st_blksize;
210 	lbuf.st_blocks = buf->st_blocks;
211 	lbuf.st_flags = buf->st_flags;
212 	lbuf.st_gen = buf->st_gen;
213 
214 	return (copyout(&lbuf, ubuf, sizeof(lbuf)));
215 }
216 
217 int
218 linux_stat(struct thread *td, struct linux_stat_args *args)
219 {
220 	struct stat buf;
221 	int error;
222 #ifdef DEBUG
223 	if (ldebug(stat))
224 	printf(ARGS(stat, "%s, *"), args->path);
225 #endif
226 	error = kern_stat(td, args->path, UIO_SYSSPACE, &buf);
227 	if (error)
228 		return (error);
229 	return(stat_copyout(&buf, args->up));
230 }
231 
232 int
233 linux_lstat(struct thread *td, struct linux_lstat_args *args)
234 {
235 	struct stat buf;
236 	int error;
237 
238 #ifdef DEBUG
239 	if (ldebug(lstat))
240 	printf(ARGS(lstat, "%s, *"), args->path);
241 #endif
242 	error = kern_lstat(td, args->path, UIO_SYSSPACE, &buf);
243 	if (error)
244 		return (error);
245 	return(stat_copyout(&buf, args->up));
246 }
247 
248 /* XXX - All fields of type l_int are defined as l_long on i386 */
249 struct l_statfs {
250 	l_int		f_type;
251 	l_int		f_bsize;
252 	l_int		f_blocks;
253 	l_int		f_bfree;
254 	l_int		f_bavail;
255 	l_int		f_files;
256 	l_int		f_ffree;
257 	l_fsid_t	f_fsid;
258 	l_int		f_namelen;
259 	l_int		f_spare[6];
260 };
261 
262 #define	LINUX_CODA_SUPER_MAGIC	0x73757245L
263 #define	LINUX_EXT2_SUPER_MAGIC	0xEF53L
264 #define	LINUX_HPFS_SUPER_MAGIC	0xf995e849L
265 #define	LINUX_ISOFS_SUPER_MAGIC	0x9660L
266 #define	LINUX_MSDOS_SUPER_MAGIC	0x4d44L
267 #define	LINUX_NCP_SUPER_MAGIC	0x564cL
268 #define	LINUX_NFS_SUPER_MAGIC	0x6969L
269 #define	LINUX_NTFS_SUPER_MAGIC	0x5346544EL
270 #define	LINUX_PROC_SUPER_MAGIC	0x9fa0L
271 #define	LINUX_UFS_SUPER_MAGIC	0x00011954L	/* XXX - UFS_MAGIC in Linux */
272 #define LINUX_DEVFS_SUPER_MAGIC	0x1373L
273 
274 static long
275 bsd_to_linux_ftype(const char *fstypename)
276 {
277 	int i;
278 	static struct {const char *bsd_name; long linux_type;} b2l_tbl[] = {
279 		{"ufs",     LINUX_UFS_SUPER_MAGIC},
280 		{"cd9660",  LINUX_ISOFS_SUPER_MAGIC},
281 		{"nfs",     LINUX_NFS_SUPER_MAGIC},
282 		{"ext2fs",  LINUX_EXT2_SUPER_MAGIC},
283 		{"procfs",  LINUX_PROC_SUPER_MAGIC},
284 		{"msdosfs", LINUX_MSDOS_SUPER_MAGIC},
285 		{"ntfs",    LINUX_NTFS_SUPER_MAGIC},
286 		{"nwfs",    LINUX_NCP_SUPER_MAGIC},
287 		{"hpfs",    LINUX_HPFS_SUPER_MAGIC},
288 		{"coda",    LINUX_CODA_SUPER_MAGIC},
289 		{"devfs",   LINUX_DEVFS_SUPER_MAGIC},
290 		{NULL,      0L}};
291 
292 	for (i = 0; b2l_tbl[i].bsd_name != NULL; i++)
293 		if (strcmp(b2l_tbl[i].bsd_name, fstypename) == 0)
294 			return (b2l_tbl[i].linux_type);
295 
296 	return (0L);
297 }
298 
299 static void
300 bsd_to_linux_statfs(struct statfs *bsd_statfs, struct l_statfs *linux_statfs)
301 {
302 
303 	linux_statfs->f_type = bsd_to_linux_ftype(bsd_statfs->f_fstypename);
304 	linux_statfs->f_bsize = bsd_statfs->f_bsize;
305 	linux_statfs->f_blocks = bsd_statfs->f_blocks;
306 	linux_statfs->f_bfree = bsd_statfs->f_bfree;
307 	linux_statfs->f_bavail = bsd_statfs->f_bavail;
308 	linux_statfs->f_ffree = bsd_statfs->f_ffree;
309 	linux_statfs->f_files = bsd_statfs->f_files;
310 	linux_statfs->f_fsid.val[0] = bsd_statfs->f_fsid.val[0];
311 	linux_statfs->f_fsid.val[1] = bsd_statfs->f_fsid.val[1];
312 	linux_statfs->f_namelen = MAXNAMLEN;
313 }
314 
315 int
316 linux_statfs(struct thread *td, struct linux_statfs_args *args)
317 {
318 	struct l_statfs linux_statfs;
319 	struct statfs bsd_statfs;
320 	char *path;
321 	int error;
322 
323 	LCONVPATHEXIST(td, args->path, &path);
324 
325 #ifdef DEBUG
326 	if (ldebug(statfs))
327 		printf(ARGS(statfs, "%s, *"), path);
328 #endif
329 	error = kern_statfs(td, path, UIO_SYSSPACE, &bsd_statfs);
330 	LFREEPATH(path);
331 	if (error)
332 		return (error);
333 	bsd_to_linux_statfs(&bsd_statfs, &linux_statfs);
334 	return copyout(&linux_statfs, args->buf, sizeof(linux_statfs));
335 }
336 
337 int
338 linux_fstatfs(struct thread *td, struct linux_fstatfs_args *args)
339 {
340 	struct l_statfs linux_statfs;
341 	struct statfs bsd_statfs;
342 	int error;
343 
344 #ifdef DEBUG
345 	if (ldebug(fstatfs))
346 		printf(ARGS(fstatfs, "%d, *"), args->fd);
347 #endif
348 	error = kern_fstatfs(td, args->fd, &bsd_statfs);
349 	if (error)
350 		return error;
351 	bsd_to_linux_statfs(&bsd_statfs, &linux_statfs);
352 	return copyout(&linux_statfs, args->buf, sizeof(linux_statfs));
353 }
354 
355 struct l_ustat
356 {
357 	l_daddr_t	f_tfree;
358 	l_ino_t		f_tinode;
359 	char		f_fname[6];
360 	char		f_fpack[6];
361 };
362 
363 int
364 linux_ustat(struct thread *td, struct linux_ustat_args *args)
365 {
366 #ifdef DEBUG
367 	if (ldebug(ustat))
368 		printf(ARGS(ustat, "%d, *"), args->dev);
369 #endif
370 
371 	return (EOPNOTSUPP);
372 }
373 
374 #if defined(__i386__) || (defined(__amd64__) && defined(COMPAT_LINUX32))
375 
376 static int
377 stat64_copyout(struct stat *buf, void *ubuf)
378 {
379 	struct l_stat64 lbuf;
380 
381 	bzero(&lbuf, sizeof(lbuf));
382 	lbuf.st_dev = uminor(buf->st_dev) | (umajor(buf->st_dev) << 8);
383 	lbuf.st_ino = buf->st_ino;
384 	lbuf.st_mode = buf->st_mode;
385 	lbuf.st_nlink = buf->st_nlink;
386 	lbuf.st_uid = buf->st_uid;
387 	lbuf.st_gid = buf->st_gid;
388 	lbuf.st_rdev = buf->st_rdev;
389 	lbuf.st_size = buf->st_size;
390 	lbuf.st_atime = buf->st_atime;
391 	lbuf.st_mtime = buf->st_mtime;
392 	lbuf.st_ctime = buf->st_ctime;
393 	lbuf.st_blksize = buf->st_blksize;
394 	lbuf.st_blocks = buf->st_blocks;
395 
396 	/*
397 	 * The __st_ino field makes all the difference. In the Linux kernel
398 	 * it is conditionally compiled based on STAT64_HAS_BROKEN_ST_INO,
399 	 * but without the assignment to __st_ino the runtime linker refuses
400 	 * to mmap(2) any shared libraries. I guess it's broken alright :-)
401 	 */
402 	lbuf.__st_ino = buf->st_ino;
403 
404 	return (copyout(&lbuf, ubuf, sizeof(lbuf)));
405 }
406 
407 int
408 linux_stat64(struct thread *td, struct linux_stat64_args *args)
409 {
410 	struct stat buf;
411 	char *filename;
412 	int error;
413 
414 	LCONVPATHEXIST(td, args->filename, &filename);
415 
416 #ifdef DEBUG
417 	if (ldebug(stat64))
418 		printf(ARGS(stat64, "%s, *"), filename);
419 #endif
420 
421 	error = kern_stat(td, filename, UIO_SYSSPACE, &buf);
422 	if (!error && strlen(filename) > strlen("/dev/pts/") &&
423 	    !strncmp(filename, "/dev/pts/", strlen("/dev/pts/"))
424 	    && filename[9] >= '0' && filename[9] <= '9') {
425 		/*
426 		 * Linux checks major and minors of the slave device to make
427 		 * sure it's a pty deivce, so let's make him believe it is.
428 		 */
429 		buf.st_rdev = (136 << 8);
430 	}
431 
432 	LFREEPATH(filename);
433 	if (error)
434 		return (error);
435 	return (stat64_copyout(&buf, args->statbuf));
436 }
437 
438 int
439 linux_lstat64(struct thread *td, struct linux_lstat64_args *args)
440 {
441 	struct stat sb;
442 	char *filename;
443 	int error;
444 
445 	LCONVPATHEXIST(td, args->filename, &filename);
446 
447 #ifdef DEBUG
448 	if (ldebug(lstat64))
449 		printf(ARGS(lstat64, "%s, *"), args->filename);
450 #endif
451 
452 	error = kern_lstat(td, filename, UIO_SYSSPACE, &sb);
453 	LFREEPATH(filename);
454 	if (error)
455 		return (error);
456 	return (stat64_copyout(&sb, args->statbuf));
457 }
458 
459 int
460 linux_fstat64(struct thread *td, struct linux_fstat64_args *args)
461 {
462 	struct stat buf;
463 	int error;
464 
465 #ifdef DEBUG
466 	if (ldebug(fstat64))
467 		printf(ARGS(fstat64, "%d, *"), args->fd);
468 #endif
469 
470 	error = kern_fstat(td, args->fd, &buf);
471 	if (!error)
472 		error = stat64_copyout(&buf, args->statbuf);
473 
474 	return (error);
475 }
476 
477 #endif /* __i386__ || (__amd64__ && COMPAT_LINUX32) */
478