Head

GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	usr.bin/rdistd/filesys.c	Lines:	0	129	0.0 %
Date:	2016-12-06	Branches:	0	102	0.0 %


/*	$OpenBSD: filesys.c,v 1.19 2015/01/21 04:08:37 guenther Exp $	*/

/*
 * Copyright (c) 1983 Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <sys/types.h>
#include <sys/mount.h>
#include <errno.h>
#include <string.h>
#include <unistd.h>

#include "server.h"

/*
 * This file contains functions dealing with getting info
 * about mounted filesystems.
 */


jmp_buf env;

/*
 * Given a pathname, find the fullest component that exists.
 * If statbuf is not NULL, set it to point at our stat buffer.
 */
char *
find_file(char *pathname, struct stat *statbuf, int *isvalid)
{
	static char last_pathname[PATH_MAX];
	static char file[PATH_MAX + 3];
	static struct stat filestat;
	char *p;

	/*
	 * Mark the statbuf as invalid to start with.
	 */
	*isvalid = 0;

	/*
	 * If this is the same pathname as the last time, and
	 * the file buffer is valid and we're doing the same stat()
	 * or lstat(), then set statbuf to the last filestat and
	 * return the last file we found.
	 */
	if (strcmp(pathname, last_pathname) == 0 && file[0]) {
		if (statbuf)
			statbuf = &filestat;
		if (strcmp(pathname, file) == 0)
			*isvalid = 1;
		return(file);
	}

	if (strlen(pathname) > sizeof(file) + 3) {
		error("%s: Name to large for buffer.", pathname);
	        return(NULL);
	}

	/*
	 * Save for next time
	 */
	(void) strlcpy(last_pathname, pathname, sizeof(last_pathname));

	if (*pathname == '/')
	        (void) strlcpy(file, pathname, sizeof(file));
	else {
		/*
		 * Ensure we have a directory (".") in our path
		 * so we have something to stat in case the file
		 * does not exist.
		 */
	        (void) strlcpy(file, "./", sizeof(file));
		(void) strlcat(file, pathname, sizeof(file));
	}

	while (lstat(file, &filestat) != 0) {
		/*
		 * Trim the last part of the pathname to try next level up
		 */
		if (errno == ENOENT) {
			/*
			 * Trim file name to get directory name.
			 * Normally we want to change /dir1/dir2/file
			 * into "/dir1/dir2/."
			 */
			if ((p = strrchr(file, '/')) != NULL) {
				if (strcmp(p, "/.") == 0) {
					*p = CNULL;
				} else {
					*++p = '.';
					*++p = CNULL;
				}
			} else {
				/*
				 * Couldn't find anything, so give up.
				 */
				debugmsg(DM_MISC, "Cannot find dir of `%s'",
					 pathname);
				return(NULL);
			}
			continue;
		} else {
			error("%s: lstat failed: %s", pathname, SYSERR);
			return(NULL);
		}
	}

	if (statbuf)
		bcopy(&filestat, statbuf, sizeof(filestat));

	/*
	 * Trim the "/." that we added.
	 */
	p = &file[strlen(file) - 1];
	if (*p == '.')
		*p-- = CNULL;
	for ( ; p && *p && *p == '/' && p != file; --p)
		*p = CNULL;

	/*
	 * If this file is a symlink we really want the parent directory
	 * name in case the symlink points to another filesystem.
	 */
	if (S_ISLNK(filestat.st_mode))
		if ((p = strrchr(file, '/')) && *p+1) {
			/* Is this / (root)? */
			if (p == file)
				file[1] = CNULL;
			else
				*p = CNULL;
		}

	if (strcmp(pathname, file) == 0)
		*isvalid = 1;

	return(*file ? file : NULL);
}


/*
 * Find the device that "filest" is on in the "mntinfo" linked list.
 */
mntent_t *
findmnt(struct stat *filest, struct mntinfo *mntinfo)
{
	struct mntinfo *mi;

	for (mi = mntinfo; mi; mi = mi->mi_nxt) {
		if (mi->mi_mnt->me_flags & MEFLAG_IGNORE)
			continue;
		if (filest->st_dev == mi->mi_dev)
			return(mi->mi_mnt);
	}

	return(NULL);
}

/*
 * Is "mnt" a duplicate of any of the mntinfo->mi_mnt elements?
 */
int
isdupmnt(mntent_t *mnt, struct mntinfo *mntinfo)
{
	struct mntinfo *m;

	for (m = mntinfo; m; m = m->mi_nxt)
		if (strcmp(m->mi_mnt->me_path, mnt->me_path) == 0)
			return(1);

	return(0);
}

/*
 * Alarm clock
 */
void
wakeup(int dummy)
{
	debugmsg(DM_CALL, "wakeup() in filesys.c called");
	longjmp(env, 1);
}

/*
 * Make a linked list of mntinfo structures.
 * Use "mi" as the base of the list if it's non NULL.
 */
struct mntinfo *
makemntinfo(struct mntinfo *mi)
{
	static struct mntinfo *mntinfo;
	struct mntinfo *newmi, *m;
	struct stat mntstat;
	mntent_t *mnt;
	int timeo = 310;

	if (!setmountent()) {
		message(MT_NERROR, "setmntent failed: %s", SYSERR);
		return(NULL);
	}

	(void) signal(SIGALRM, wakeup);
	(void) alarm(timeo);
	if (setjmp(env)) {
		message(MT_NERROR, "Timeout getting mount info");
		return(NULL);
	}

	mntinfo = mi;
	while ((mnt = getmountent()) != NULL) {
		debugmsg(DM_MISC, "mountent = '%s'", mnt->me_path);

		/*
		 * Make sure we don't already have it for some reason
		 */
		if (isdupmnt(mnt, mntinfo))
			continue;

		/*
		 * Get stat info
		 */
		if (stat(mnt->me_path, &mntstat) != 0) {
			message(MT_WARNING, "%s: Cannot stat filesystem: %s",
				mnt->me_path, SYSERR);
			continue;
		}

		/*
		 * Create new entry
		 */
		newmi = xcalloc(1, sizeof(*newmi));
		newmi->mi_mnt = newmountent(mnt);
		newmi->mi_dev = mntstat.st_dev;

		/*
		 * Add entry to list
		 */
		if (mntinfo) {
			for (m = mntinfo; m->mi_nxt; m = m->mi_nxt)
				continue;
			m->mi_nxt = newmi;
		} else
			mntinfo = newmi;
	}

	alarm(0);
	endmountent();

	return(mntinfo);
}

/*
 * Given a name like /usr/src/etc/foo.c returns the mntent
 * structure for the file system it lives in.
 *
 * If "statbuf" is not NULL it is used as the stat buffer too avoid
 * stat()'ing the file again back in server.c.
 */
mntent_t *
getmntpt(char *pathname, struct stat *statbuf, int *isvalid)
{
	static struct mntinfo *mntinfo = NULL;
	static struct stat filestat;
	struct stat *pstat;
	struct mntinfo *tmpmi;
	mntent_t *mnt;

	/*
	 * Use the supplied stat buffer if not NULL or our own.
	 */
	if (statbuf)
		pstat = statbuf;
	else
		pstat = &filestat;

	if (!find_file(pathname, pstat, isvalid))
	        return(NULL);

	/*
	 * Make mntinfo if it doesn't exist.
	 */
	if (!mntinfo)
		mntinfo = makemntinfo(NULL);

	/*
	 * Find the mnt that pathname is on.
	 */
	if ((mnt = findmnt(pstat, mntinfo)) != NULL)
		return(mnt);

	/*
	 * We failed to find correct mnt, so maybe it's a newly
	 * mounted filesystem.  We rebuild mntinfo and try again.
	 */
	if ((tmpmi = makemntinfo(mntinfo)) != NULL) {
		mntinfo = tmpmi;
		if ((mnt = findmnt(pstat, mntinfo)) != NULL)
			return(mnt);
	}

	error("%s: Could not find mount point", pathname);
	return(NULL);
}


/*
 * Is "path" NFS mounted?  Return 1 if it is, 0 if not, or -1 on error.
 */
int
is_nfs_mounted(char *path, struct stat *statbuf, int *isvalid)
{
	mntent_t *mnt;

	if ((mnt = getmntpt(path, statbuf, isvalid)) == NULL)
		return(-1);

	if (mnt->me_flags & MEFLAG_NFS)
		return(1);

	return(0);
}

/*
 * Is "path" on a read-only mounted filesystem?
 * Return 1 if it is, 0 if not, or -1 on error.
 */
int
is_ro_mounted(char *path, struct stat *statbuf, int *isvalid)
{
	mntent_t *mnt;

	if ((mnt = getmntpt(path, statbuf, isvalid)) == NULL)
		return(-1);

	if (mnt->me_flags & MEFLAG_READONLY)
		return(1);

	return(0);
}

/*
 * Is "path" a symlink?
 * Return 1 if it is, 0 if not, or -1 on error.
 */
int
is_symlinked(char *path, struct stat *statbuf, int *isvalid)
{
	static struct stat stb;

	if (!(*isvalid)) {
		if (lstat(path, &stb) != 0)
			return(-1);
		statbuf = &stb;
	}

	if (S_ISLNK(statbuf->st_mode))
		return(1);

	return(0);
}

/*
 * Get filesystem information for "file".  Set freespace
 * to the amount of free (available) space and number of free
 * files (inodes) on the filesystem "file" resides on.
 * Returns 0 on success or -1 on failure.
 * Filesystem values < 0 indicate unsupported or unavailable
 * information.
 */
int
getfilesysinfo(char *file, int64_t *freespace, int64_t *freefiles)
{
	struct statfs statfsbuf;
	char *mntpt;
	int64_t val;
	int t, r;

	/*
	 * Get the mount point of the file.
	 */
	mntpt = find_file(file, NULL, &t);
	if (!mntpt) {
		debugmsg(DM_MISC, "unknown mount point for `%s'", file);
		return(-1);
	}

	r = statfs(mntpt, &statfsbuf);
	if (r < 0) {
		error("%s: Cannot statfs filesystem: %s.", mntpt, SYSERR);
		return(-1);
	}

	/*
	 * If values are < 0, then assume the value is unsupported
	 * or unavailable for that filesystem type.
	 */
	val = -1;
	if (statfsbuf.f_bavail >= 0)
		val = (statfsbuf.f_bavail * (statfsbuf.f_bsize / 512)) / 2;
	*freespace = val;

	val = -1;
	if (statfsbuf.f_favail >= 0)
		val = statfsbuf.f_favail;
	*freefiles = val;

	return(0);
}


Generated by: GCOVR (Version 3.3)

Line	Branch	Exec	Source
1			/* $OpenBSD: filesys.c,v 1.19 2015/01/21 04:08:37 guenther Exp $ */
2
3			/*
4			* Copyright (c) 1983 Regents of the University of California.
5			* All rights reserved.
6			*
7			* Redistribution and use in source and binary forms, with or without
8			* modification, are permitted provided that the following conditions
9			* are met:
10			* 1. Redistributions of source code must retain the above copyright
11			* notice, this list of conditions and the following disclaimer.
12			* 2. Redistributions in binary form must reproduce the above copyright
13			* notice, this list of conditions and the following disclaimer in the
14			* documentation and/or other materials provided with the distribution.
15			* 3. Neither the name of the University nor the names of its contributors
16			* may be used to endorse or promote products derived from this software
17			* without specific prior written permission.
18			*
19			* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20			* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21			* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22			* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23			* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24			* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25			* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26			* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27			* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28			* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29			* SUCH DAMAGE.
30			*/
31
32			#include <sys/types.h>
33			#include <sys/mount.h>
34			#include <errno.h>
35			#include <string.h>
36			#include <unistd.h>
37
38			#include "server.h"
39
40			/*
41			* This file contains functions dealing with getting info
42			* about mounted filesystems.
43			*/
44
45
46			jmp_buf env;
47
48			/*
49			* Given a pathname, find the fullest component that exists.
50			* If statbuf is not NULL, set it to point at our stat buffer.
51			*/
52			char *
53			find_file(char pathname, struct stat statbuf, int *isvalid)
54			{
55			static char last_pathname[PATH_MAX];
56			static char file[PATH_MAX + 3];
57			static struct stat filestat;
58			char *p;
59
60			/*
61			* Mark the statbuf as invalid to start with.
62			*/
63			*isvalid = 0;
64
65			/*
66			* If this is the same pathname as the last time, and
67			* the file buffer is valid and we're doing the same stat()
68			* or lstat(), then set statbuf to the last filestat and
69			* return the last file we found.
70			*/
71			if (strcmp(pathname, last_pathname) == 0 && file[0]) {
72			if (statbuf)
73			statbuf = &filestat;
74			if (strcmp(pathname, file) == 0)
75			*isvalid = 1;
76			return(file);
77			}
78
79			if (strlen(pathname) > sizeof(file) + 3) {
80			error("%s: Name to large for buffer.", pathname);
81			return(NULL);
82			}
83
84			/*
85			* Save for next time
86			*/
87			(void) strlcpy(last_pathname, pathname, sizeof(last_pathname));
88
89			if (*pathname == '/')
90			(void) strlcpy(file, pathname, sizeof(file));
91			else {
92			/*
93			* Ensure we have a directory (".") in our path
94			* so we have something to stat in case the file
95			* does not exist.
96			*/
97			(void) strlcpy(file, "./", sizeof(file));
98			(void) strlcat(file, pathname, sizeof(file));
99			}
100
101			while (lstat(file, &filestat) != 0) {
102			/*
103			* Trim the last part of the pathname to try next level up
104			*/
105			if (errno == ENOENT) {
106			/*
107			* Trim file name to get directory name.
108			* Normally we want to change /dir1/dir2/file
109			* into "/dir1/dir2/."
110			*/
111			if ((p = strrchr(file, '/')) != NULL) {
112			if (strcmp(p, "/.") == 0) {
113			*p = CNULL;
114			} else {
115			*++p = '.';
116			*++p = CNULL;
117			}
118			} else {
119			/*
120			* Couldn't find anything, so give up.
121			*/
122			debugmsg(DM_MISC, "Cannot find dir of `%s'",
123			pathname);
124			return(NULL);
125			}
126			continue;
127			} else {
128			error("%s: lstat failed: %s", pathname, SYSERR);
129			return(NULL);
130			}
131			}
132
133			if (statbuf)
134			bcopy(&filestat, statbuf, sizeof(filestat));
135
136			/*
137			* Trim the "/." that we added.
138			*/
139			p = &file[strlen(file) - 1];
140			if (*p == '.')
141			*p-- = CNULL;
142			for ( ; p && p && p == '/' && p != file; --p)
143			*p = CNULL;
144
145			/*
146			* If this file is a symlink we really want the parent directory
147			* name in case the symlink points to another filesystem.
148			*/
149			if (S_ISLNK(filestat.st_mode))
150			if ((p = strrchr(file, '/')) && *p+1) {
151			/* Is this / (root)? */
152			if (p == file)
153			file[1] = CNULL;
154			else
155			*p = CNULL;
156			}
157
158			if (strcmp(pathname, file) == 0)
159			*isvalid = 1;
160
161			return(*file ? file : NULL);
162			}
163
164
165			/*
166			* Find the device that "filest" is on in the "mntinfo" linked list.
167			*/
168			mntent_t *
169			findmnt(struct stat filest, struct mntinfo mntinfo)
170			{
171			struct mntinfo *mi;
172
173			for (mi = mntinfo; mi; mi = mi->mi_nxt) {
174			if (mi->mi_mnt->me_flags & MEFLAG_IGNORE)
175			continue;
176			if (filest->st_dev == mi->mi_dev)
177			return(mi->mi_mnt);
178			}
179
180			return(NULL);
181			}
182
183			/*
184			* Is "mnt" a duplicate of any of the mntinfo->mi_mnt elements?
185			*/
186			int
187			isdupmnt(mntent_t mnt, struct mntinfo mntinfo)
188			{
189			struct mntinfo *m;
190
191			for (m = mntinfo; m; m = m->mi_nxt)
192			if (strcmp(m->mi_mnt->me_path, mnt->me_path) == 0)
193			return(1);
194
195			return(0);
196			}
197
198			/*
199			* Alarm clock
200			*/
201			void
202			wakeup(int dummy)
203			{
204			debugmsg(DM_CALL, "wakeup() in filesys.c called");
205			longjmp(env, 1);
206			}
207
208			/*
209			* Make a linked list of mntinfo structures.
210			* Use "mi" as the base of the list if it's non NULL.
211			*/
212			struct mntinfo *
213			makemntinfo(struct mntinfo *mi)
214			{
215			static struct mntinfo *mntinfo;
216			struct mntinfo newmi, m;
217			struct stat mntstat;
218			mntent_t *mnt;
219			int timeo = 310;
220
221			if (!setmountent()) {
222			message(MT_NERROR, "setmntent failed: %s", SYSERR);
223			return(NULL);
224			}
225
226			(void) signal(SIGALRM, wakeup);
227			(void) alarm(timeo);
228			if (setjmp(env)) {
229			message(MT_NERROR, "Timeout getting mount info");
230			return(NULL);
231			}
232
233			mntinfo = mi;
234			while ((mnt = getmountent()) != NULL) {
235			debugmsg(DM_MISC, "mountent = '%s'", mnt->me_path);
236
237			/*
238			* Make sure we don't already have it for some reason
239			*/
240			if (isdupmnt(mnt, mntinfo))
241			continue;
242
243			/*
244			* Get stat info
245			*/
246			if (stat(mnt->me_path, &mntstat) != 0) {
247			message(MT_WARNING, "%s: Cannot stat filesystem: %s",
248			mnt->me_path, SYSERR);
249			continue;
250			}
251
252			/*
253			* Create new entry
254			*/
255			newmi = xcalloc(1, sizeof(*newmi));
256			newmi->mi_mnt = newmountent(mnt);
257			newmi->mi_dev = mntstat.st_dev;
258
259			/*
260			* Add entry to list
261			*/
262			if (mntinfo) {
263			for (m = mntinfo; m->mi_nxt; m = m->mi_nxt)
264			continue;
265			m->mi_nxt = newmi;
266			} else
267			mntinfo = newmi;
268			}
269
270			alarm(0);
271			endmountent();
272
273			return(mntinfo);
274			}
275
276			/*
277			* Given a name like /usr/src/etc/foo.c returns the mntent
278			* structure for the file system it lives in.
279			*
280			* If "statbuf" is not NULL it is used as the stat buffer too avoid
281			* stat()'ing the file again back in server.c.
282			*/
283			mntent_t *
284			getmntpt(char pathname, struct stat statbuf, int *isvalid)
285			{
286			static struct mntinfo *mntinfo = NULL;
287			static struct stat filestat;
288			struct stat *pstat;
289			struct mntinfo *tmpmi;
290			mntent_t *mnt;
291
292			/*
293			* Use the supplied stat buffer if not NULL or our own.
294			*/
295			if (statbuf)
296			pstat = statbuf;
297			else
298			pstat = &filestat;
299
300			if (!find_file(pathname, pstat, isvalid))
301			return(NULL);
302
303			/*
304			* Make mntinfo if it doesn't exist.
305			*/
306			if (!mntinfo)
307			mntinfo = makemntinfo(NULL);
308
309			/*
310			* Find the mnt that pathname is on.
311			*/
312			if ((mnt = findmnt(pstat, mntinfo)) != NULL)
313			return(mnt);
314
315			/*
316			* We failed to find correct mnt, so maybe it's a newly
317			* mounted filesystem. We rebuild mntinfo and try again.
318			*/
319			if ((tmpmi = makemntinfo(mntinfo)) != NULL) {
320			mntinfo = tmpmi;
321			if ((mnt = findmnt(pstat, mntinfo)) != NULL)
322			return(mnt);
323			}
324
325			error("%s: Could not find mount point", pathname);
326			return(NULL);
327			}
328
329
330			/*
331			* Is "path" NFS mounted? Return 1 if it is, 0 if not, or -1 on error.
332			*/
333			int
334			is_nfs_mounted(char path, struct stat statbuf, int *isvalid)
335			{
336			mntent_t *mnt;
337
338			if ((mnt = getmntpt(path, statbuf, isvalid)) == NULL)
339			return(-1);
340
341			if (mnt->me_flags & MEFLAG_NFS)
342			return(1);
343
344			return(0);
345			}
346
347			/*
348			* Is "path" on a read-only mounted filesystem?
349			* Return 1 if it is, 0 if not, or -1 on error.
350			*/
351			int
352			is_ro_mounted(char path, struct stat statbuf, int *isvalid)
353			{
354			mntent_t *mnt;
355
356			if ((mnt = getmntpt(path, statbuf, isvalid)) == NULL)
357			return(-1);
358
359			if (mnt->me_flags & MEFLAG_READONLY)
360			return(1);
361
362			return(0);
363			}
364
365			/*
366			* Is "path" a symlink?
367			* Return 1 if it is, 0 if not, or -1 on error.
368			*/
369			int
370			is_symlinked(char path, struct stat statbuf, int *isvalid)
371			{
372			static struct stat stb;
373
374			if (!(*isvalid)) {
375			if (lstat(path, &stb) != 0)
376			return(-1);
377			statbuf = &stb;
378			}
379
380			if (S_ISLNK(statbuf->st_mode))
381			return(1);
382
383			return(0);
384			}
385
386			/*
387			* Get filesystem information for "file". Set freespace
388			* to the amount of free (available) space and number of free
389			* files (inodes) on the filesystem "file" resides on.
390			* Returns 0 on success or -1 on failure.
391			* Filesystem values < 0 indicate unsupported or unavailable
392			* information.
393			*/
394			int
395			getfilesysinfo(char file, int64_t freespace, int64_t *freefiles)
396			{
397			struct statfs statfsbuf;
398			char *mntpt;
399			int64_t val;
400			int t, r;
401
402			/*
403			* Get the mount point of the file.
404			*/
405			mntpt = find_file(file, NULL, &t);
406			if (!mntpt) {
407			debugmsg(DM_MISC, "unknown mount point for `%s'", file);
408			return(-1);
409			}
410
411			r = statfs(mntpt, &statfsbuf);
412			if (r < 0) {
413			error("%s: Cannot statfs filesystem: %s.", mntpt, SYSERR);
414			return(-1);
415			}
416
417			/*
418			* If values are < 0, then assume the value is unsupported
419			* or unavailable for that filesystem type.
420			*/
421			val = -1;
422			if (statfsbuf.f_bavail >= 0)
423			val = (statfsbuf.f_bavail * (statfsbuf.f_bsize / 512)) / 2;
424			*freespace = val;
425
426			val = -1;
427			if (statfsbuf.f_favail >= 0)
428			val = statfsbuf.f_favail;
429			*freefiles = val;
430
431			return(0);
432			}