[thirdparty/e2fsprogs.git] / lib / ext2fs / ismounted.c

/*
 * ismounted.c --- Check to see if the filesystem was mounted
 *
 * Copyright (C) 1995,1996,1997,1998,1999,2000 Theodore Ts'o.
 *
 * %Begin-Header%
 * This file may be redistributed under the terms of the GNU Public
 * License.
 * %End-Header%
 */

#include <stdio.h>
#if HAVE_UNISTD_H
#include <unistd.h>
#endif
#if HAVE_ERRNO_H
#include <errno.h>
#endif
#include <fcntl.h>
#ifdef HAVE_LINUX_FD_H
#include <linux/fd.h>
#endif
#ifdef HAVE_MNTENT_H
#include <mntent.h>
#endif
#ifdef HAVE_GETMNTINFO
#include <paths.h>
#include <sys/param.h>
#include <sys/mount.h>
#endif /* HAVE_GETMNTINFO */
#include <string.h>
#include <sys/stat.h>

#include "ext2_fs.h"
#include "ext2fs.h"

#ifdef HAVE_MNTENT_H
/*
 * Helper function which checks a file in /etc/mtab format to see if a
 * filesystem is mounted.  Returns an error if the file doesn't exist
 * or can't be opened.
 */
static errcode_t check_mntent_file(const char *mtab_file, const char *file,
				   int *mount_flags, char *mtpt, int mtlen)
{
	struct mntent 	*mnt;
	struct stat	st_buf;
	errcode_t	retval = 0;
	dev_t		file_dev=0, file_rdev=0;
	ino_t		file_ino=0;
	FILE 		*f;
	int		fd;

	*mount_flags = 0;
	if ((f = setmntent (mtab_file, "r")) == NULL)
		return errno;
	if (stat(file, &st_buf) == 0) {
		if (S_ISBLK(st_buf.st_mode)) {
#ifndef __GNU__ /* The GNU hurd is broken with respect to stat devices */
			file_rdev = st_buf.st_rdev;
#endif	/* __GNU__ */
		} else {
			file_dev = st_buf.st_dev;
			file_ino = st_buf.st_ino;
		}
	}
	while ((mnt = getmntent (f)) != NULL) {
		if (strcmp(file, mnt->mnt_fsname) == 0)
			break;
		if (stat(mnt->mnt_fsname, &st_buf) == 0) {
			if (S_ISBLK(st_buf.st_mode)) {
#ifndef __GNU__
				if (file_rdev && (file_rdev == st_buf.st_rdev))
					break;
#endif	/* __GNU__ */
			} else {
				if (file_dev && ((file_dev == st_buf.st_dev) &&
						 (file_ino == st_buf.st_ino)))
					break;
			}
		}
	}

	if (mnt == 0) {
#ifndef __GNU__ /* The GNU hurd is broken with respect to stat devices */
		/*
		 * Do an extra check to see if this is the root device.  We
		 * can't trust /etc/mtab, and /proc/mounts will only list
		 * /dev/root for the root filesystem.  Argh.  Instead we
		 * check if the given device has the same major/minor number
		 * as the device that the root directory is on.
		 */
		if (file_rdev && stat("/", &st_buf) == 0) {
			if (st_buf.st_dev == file_rdev) {
				*mount_flags = EXT2_MF_MOUNTED;
				if (mtpt)
					strncpy(mtpt, "/", mtlen);
				goto is_root;
			}
		}
#endif	/* __GNU__ */
		goto errout;
	}
#ifndef __GNU__ /* The GNU hurd is deficient; what else is new? */
	/* Validate the entry in case /etc/mtab is out of date */
	/*
	 * We need to be paranoid, because some broken distributions
	 * (read: Slackware) don't initialize /etc/mtab before checking
	 * all of the non-root filesystems on the disk.
	 */
	if (stat(mnt->mnt_dir, &st_buf) < 0) {
		retval = errno;
		if (retval == ENOENT) {
#ifdef DEBUG
			printf("Bogus entry in %s!  (%s does not exist)\n",
			       mtab_file, mnt->mnt_dir);
#endif /* DEBUG */
			retval = 0;
		}
		goto errout;
	}
	if (file_rdev && (st_buf.st_dev != file_rdev)) {
#ifdef DEBUG
		printf("Bogus entry in %s!  (%s not mounted on %s)\n",
		       mtab_file, file, mnt->mnt_dir);
#endif /* DEBUG */
		goto errout;
	}
#endif /* __GNU__ */
	*mount_flags = EXT2_MF_MOUNTED;

#ifdef MNTOPT_RO
	/* Check to see if the ro option is set */
	if (hasmntopt(mnt, MNTOPT_RO))
		*mount_flags |= EXT2_MF_READONLY;
#endif

	if (mtpt)
		strncpy(mtpt, mnt->mnt_dir, mtlen);
	/*
	 * Check to see if we're referring to the root filesystem.
	 * If so, do a manual check to see if we can open /etc/mtab
	 * read/write, since if the root is mounted read/only, the
	 * contents of /etc/mtab may not be accurate.
	 */
	if (!strcmp(mnt->mnt_dir, "/")) {
is_root:
#define TEST_FILE "/.ismount-test-file"
		*mount_flags |= EXT2_MF_ISROOT;
		fd = open(TEST_FILE, O_RDWR|O_CREAT, 0600);
		if (fd < 0) {
			if (errno == EROFS)
				*mount_flags |= EXT2_MF_READONLY;
		} else
			close(fd);
		(void) unlink(TEST_FILE);
	}
	retval = 0;
errout:
	endmntent (f);
	return retval;
}

static errcode_t check_mntent(const char *file, int *mount_flags,
			      char *mtpt, int mtlen)
{
	errcode_t	retval;

#ifdef DEBUG
	retval = check_mntent_file("/tmp/mtab", file, mount_flags,
				   mtpt, mtlen);
	if (retval == 0)
		return 0;
#endif /* DEBUG */
#ifdef __linux__
	retval = check_mntent_file("/proc/mounts", file, mount_flags,
				   mtpt, mtlen);
	if (retval == 0 && (*mount_flags != 0))
		return 0;
#endif /* __linux__ */
#if defined(MOUNTED) || defined(_PATH_MOUNTED)
#ifndef MOUNTED
#define MOUNTED _PATH_MOUNTED
#endif /* MOUNTED */
	retval = check_mntent_file(MOUNTED, file, mount_flags, mtpt, mtlen);
	return retval;
#else
	*mount_flags = 0;
	return 0;
#endif /* defined(MOUNTED) || defined(_PATH_MOUNTED) */
}

#else
#if defined(HAVE_GETMNTINFO)

static errcode_t check_getmntinfo(const char *file, int *mount_flags,
				  char *mtpt, int mtlen)
{
	struct statfs *mp;
        int    len, n;
        const  char   *s1;
	char	*s2;

        n = getmntinfo(&mp, MNT_NOWAIT);
        if (n == 0)
		return errno;

        len = sizeof(_PATH_DEV) - 1;
        s1 = file;
        if (strncmp(_PATH_DEV, s1, len) == 0)
                s1 += len;

	*mount_flags = 0;
        while (--n >= 0) {
                s2 = mp->f_mntfromname;
                if (strncmp(_PATH_DEV, s2, len) == 0) {
                        s2 += len - 1;
                        *s2 = 'r';
                }
                if (strcmp(s1, s2) == 0 || strcmp(s1, &s2[1]) == 0) {
			*mount_flags = EXT2_MF_MOUNTED;
			break;
		}
                ++mp;
	}
	if (mtpt)
		strncpy(mtpt, mp->f_mntonname, mtlen);
	return 0;
}
#endif /* HAVE_GETMNTINFO */
#endif /* HAVE_MNTENT_H */

/*
 * Check to see if we're dealing with the swap device.
 */
static int is_swap_device(const char *file)
{
	FILE		*f;
	char		buf[1024], *cp;
	dev_t		file_dev;
	struct stat	st_buf;
	int		ret = 0;

	file_dev = 0;
#ifndef __GNU__ /* The GNU hurd is broken with respect to stat devices */
	if ((stat(file, &st_buf) == 0) &&
	    S_ISBLK(st_buf.st_mode))
		file_dev = st_buf.st_rdev;
#endif	/* __GNU__ */

	if (!(f = fopen("/proc/swaps", "r")))
		return 0;
	/* Skip the first line */
	if (fgets(buf, sizeof(buf), f))
	while (fgets(buf, sizeof(buf), f)) {
		if ((cp = strchr(buf, ' ')) != NULL)
			*cp = 0;
		if ((cp = strchr(buf, '\t')) != NULL)
			*cp = 0;
		if (strcmp(buf, file) == 0) {
			ret++;
			break;
		}
#ifndef __GNU__
		if (file_dev && (stat(buf, &st_buf) == 0) &&
		    S_ISBLK(st_buf.st_mode) &&
		    file_dev == st_buf.st_rdev) {
			ret++;
			break;
		}
#endif 	/* __GNU__ */
	}
	fclose(f);
	return ret;
}


/*
 * ext2fs_check_mount_point() fills determines if the device is
 * mounted or otherwise busy, and fills in mount_flags with one or
 * more of the following flags: EXT2_MF_MOUNTED, EXT2_MF_ISROOT,
 * EXT2_MF_READONLY, EXT2_MF_SWAP, and EXT2_MF_BUSY.  If mtpt is
 * non-NULL, the directory where the device is mounted is copied to
 * where mtpt is pointing, up to mtlen characters.
 */
#ifdef __TURBOC__
 #pragma argsused
#endif
errcode_t ext2fs_check_mount_point(const char *device, int *mount_flags,
				  char *mtpt, int mtlen)
{
	struct stat	st_buf;
	errcode_t	retval = 0;
	int		fd;

	if (is_swap_device(device)) {
		*mount_flags = EXT2_MF_MOUNTED | EXT2_MF_SWAP;
		strncpy(mtpt, "<swap>", mtlen);
	} else {
#ifdef HAVE_MNTENT_H
		retval = check_mntent(device, mount_flags, mtpt, mtlen);
#else
#ifdef HAVE_GETMNTINFO
		retval = check_getmntinfo(device, mount_flags, mtpt, mtlen);
#else
#ifdef __GNUC__
 #warning "Can't use getmntent or getmntinfo to check for mounted filesystems!"
#endif
		*mount_flags = 0;
#endif /* HAVE_GETMNTINFO */
#endif /* HAVE_MNTENT_H */
	}
	if (retval)
		return retval;

#ifdef __linux__ /* This only works on Linux 2.6+ systems */
	if ((stat(device, &st_buf) != 0) ||
	    !S_ISBLK(st_buf.st_mode))
		return 0;
	fd = open(device, O_RDONLY | O_EXCL);
	if (fd < 0) {
		if (errno == EBUSY)
			*mount_flags |= EXT2_MF_BUSY;
	} else
		close(fd);
#endif

	return 0;
}

/*
 * ext2fs_check_if_mounted() sets the mount_flags EXT2_MF_MOUNTED,
 * EXT2_MF_READONLY, and EXT2_MF_ROOT
 *
 */
errcode_t ext2fs_check_if_mounted(const char *file, int *mount_flags)
{
	return ext2fs_check_mount_point(file, mount_flags, NULL, 0);
}

#ifdef DEBUG
int main(int argc, char **argv)
{
	int	retval, mount_flags;
	char	mntpt[80];

	if (argc < 2) {
		fprintf(stderr, "Usage: %s device\n", argv[0]);
		exit(1);
	}

	mntpt[0] = 0;
	retval = ext2fs_check_mount_point(argv[1], &mount_flags,
					  mntpt, sizeof(mntpt));
	if (retval) {
		com_err(argv[0], retval,
			"while calling ext2fs_check_if_mounted");
		exit(1);
	}
	printf("Device %s reports flags %02x\n", argv[1], mount_flags);
	if (mount_flags & EXT2_MF_BUSY)
		printf("\t%s is apparently in use.\n", argv[1]);
	if (mount_flags & EXT2_MF_MOUNTED)
		printf("\t%s is mounted.\n", argv[1]);
	if (mount_flags & EXT2_MF_SWAP)
		printf("\t%s is a swap device.\n", argv[1]);
	if (mount_flags & EXT2_MF_READONLY)
		printf("\t%s is read-only.\n", argv[1]);
	if (mount_flags & EXT2_MF_ISROOT)
		printf("\t%s is the root filesystem.\n", argv[1]);
	if (mntpt[0])
		printf("\t%s is mounted on %s.\n", argv[1], mntpt);
	exit(0);
}
#endif /* DEBUG */
Commit	Line	Data
50e1e10f	1	/*
19c78dc0	2	* ismounted.c --- Check to see if the filesystem was mounted
efc6f628	3	*
cc86017b	4	* Copyright (C) 1995,1996,1997,1998,1999,2000 Theodore Ts'o.
19c78dc0 TT	5	*
	6	* %Begin-Header%
	7	* This file may be redistributed under the terms of the GNU Public
	8	* License.
	9	* %End-Header%
50e1e10f TT	10	*/
	11
	12	#include <stdio.h>
	13	#if HAVE_UNISTD_H
	14	#include <unistd.h>
	15	#endif
c4e749ab TT	16	#if HAVE_ERRNO_H
	17	#include <errno.h>
	18	#endif
50e1e10f	19	#include <fcntl.h>
50e1e10f TT	20	#ifdef HAVE_LINUX_FD_H
	21	#include <linux/fd.h>
	22	#endif
	23	#ifdef HAVE_MNTENT_H
	24	#include <mntent.h>
	25	#endif
	26	#ifdef HAVE_GETMNTINFO
	27	#include <paths.h>
	28	#include <sys/param.h>
	29	#include <sys/mount.h>
	30	#endif /* HAVE_GETMNTINFO */
31dbecd4	31	#include <string.h>
cc86017b	32	#include <sys/stat.h>
50e1e10f	33
b5abe6fa	34	#include "ext2_fs.h"
50e1e10f TT	35	#include "ext2fs.h"
	36
	37	#ifdef HAVE_MNTENT_H
	38	/*
52db0b41 TT	39	* Helper function which checks a file in /etc/mtab format to see if a
52db0b41 TT	40	* filesystem is mounted. Returns an error if the file doesn't exist
efc6f628	41	* or can't be opened.
50e1e10f	42	*/
efc6f628	43	static errcode_t check_mntent_file(const char mtab_file, const char file,
52db0b41	44	int mount_flags, char mtpt, int mtlen)
50e1e10f	45	{
2038b636	46	struct mntent *mnt;
a8fd6e36	47	struct stat st_buf;
2038b636	48	errcode_t retval = 0;
3a42fe22 TT	49	dev_t file_dev=0, file_rdev=0;
3a42fe22 TT	50	ino_t file_ino=0;
2038b636 TT	51	FILE *f;
2038b636 TT	52	int fd;
50e1e10f TT	53
50e1e10f TT	54	*mount_flags = 0;
52db0b41	55	if ((f = setmntent (mtab_file, "r")) == NULL)
50e1e10f	56	return errno;
3a42fe22 TT	57	if (stat(file, &st_buf) == 0) {
3a42fe22 TT	58	if (S_ISBLK(st_buf.st_mode)) {
a8fd6e36	59	#ifndef __GNU__ /* The GNU hurd is broken with respect to stat devices */
3a42fe22	60	file_rdev = st_buf.st_rdev;
f0efd297	61	#endif /* __GNU__ */
3a42fe22 TT	62	} else {
	63	file_dev = st_buf.st_dev;
	64	file_ino = st_buf.st_ino;
	65	}
	66	}
a8fd6e36	67	while ((mnt = getmntent (f)) != NULL) {
50e1e10f TT	68	if (strcmp(file, mnt->mnt_fsname) == 0)
50e1e10f TT	69	break;
3a42fe22 TT	70	if (stat(mnt->mnt_fsname, &st_buf) == 0) {
3a42fe22 TT	71	if (S_ISBLK(st_buf.st_mode)) {
a8fd6e36	72	#ifndef __GNU__
3a42fe22 TT	73	if (file_rdev && (file_rdev == st_buf.st_rdev))
3a42fe22 TT	74	break;
f0efd297	75	#endif /* __GNU__ */
3a42fe22 TT	76	} else {
	77	if (file_dev && ((file_dev == st_buf.st_dev) &&
	78	(file_ino == st_buf.st_ino)))
	79	break;
	80	}
	81	}
a8fd6e36	82	}
cc86017b TT	83
cc86017b TT	84	if (mnt == 0) {
66a46146	85	#ifndef __GNU__ /* The GNU hurd is broken with respect to stat devices */
cc86017b TT	86	/*
cc86017b TT	87	* Do an extra check to see if this is the root device. We
2038b636	88	* can't trust /etc/mtab, and /proc/mounts will only list
cc86017b TT	89	* /dev/root for the root filesystem. Argh. Instead we
	90	* check if the given device has the same major/minor number
	91	* as the device that the root directory is on.
	92	*/
3a42fe22 TT	93	if (file_rdev && stat("/", &st_buf) == 0) {
3a42fe22 TT	94	if (st_buf.st_dev == file_rdev) {
cc86017b TT	95	*mount_flags = EXT2_MF_MOUNTED;
cc86017b TT	96	if (mtpt)
d5f858dd	97	strncpy(mtpt, "/", mtlen);
cc86017b TT	98	goto is_root;
	99	}
	100	}
f0efd297	101	#endif /* __GNU__ */
48e6e813	102	goto errout;
2038b636 TT	103	}
	104	#ifndef __GNU__ /* The GNU hurd is deficient; what else is new? */
	105	/* Validate the entry in case /etc/mtab is out of date */
efc6f628	106	/*
2038b636 TT	107	* We need to be paranoid, because some broken distributions
	108	* (read: Slackware) don't initialize /etc/mtab before checking
	109	* all of the non-root filesystems on the disk.
	110	*/
a8fd6e36	111	if (stat(mnt->mnt_dir, &st_buf) < 0) {
2038b636 TT	112	retval = errno;
	113	if (retval == ENOENT) {
	114	#ifdef DEBUG
	115	printf("Bogus entry in %s! (%s does not exist)\n",
	116	mtab_file, mnt->mnt_dir);
f0efd297	117	#endif /* DEBUG */
2038b636 TT	118	retval = 0;
2038b636 TT	119	}
48e6e813	120	goto errout;
2038b636	121	}
3a42fe22	122	if (file_rdev && (st_buf.st_dev != file_rdev)) {
2038b636	123	#ifdef DEBUG
a8fd6e36 TT	124	printf("Bogus entry in %s! (%s not mounted on %s)\n",
a8fd6e36 TT	125	mtab_file, file, mnt->mnt_dir);
f0efd297	126	#endif /* DEBUG */
48e6e813	127	goto errout;
cc86017b	128	}
f0efd297	129	#endif /* __GNU__ */
50e1e10f	130	*mount_flags = EXT2_MF_MOUNTED;
efc6f628	131
fff45483	132	#ifdef MNTOPT_RO
52db0b41 TT	133	/* Check to see if the ro option is set */
	134	if (hasmntopt(mnt, MNTOPT_RO))
	135	*mount_flags \|= EXT2_MF_READONLY;
fff45483	136	#endif
52db0b41	137
cc86017b TT	138	if (mtpt)
cc86017b TT	139	strncpy(mtpt, mnt->mnt_dir, mtlen);
52db0b41 TT	140	/*
	141	* Check to see if we're referring to the root filesystem.
	142	* If so, do a manual check to see if we can open /etc/mtab
cc86017b TT	143	* read/write, since if the root is mounted read/only, the
cc86017b TT	144	* contents of /etc/mtab may not be accurate.
52db0b41	145	*/
50e1e10f	146	if (!strcmp(mnt->mnt_dir, "/")) {
cc86017b	147	is_root:
efc6f628	148	#define TEST_FILE "/.ismount-test-file"
50e1e10f	149	*mount_flags \|= EXT2_MF_ISROOT;
8cdd6a6f	150	fd = open(TEST_FILE, O_RDWR\|O_CREAT, 0600);
50e1e10f TT	151	if (fd < 0) {
	152	if (errno == EROFS)
	153	*mount_flags \|= EXT2_MF_READONLY;
	154	} else
	155	close(fd);
997b820e	156	(void) unlink(TEST_FILE);
50e1e10f	157	}
2038b636	158	retval = 0;
48e6e813	159	errout:
cc86017b	160	endmntent (f);
2038b636	161	return retval;
50e1e10f	162	}
52db0b41 TT	163
	164	static errcode_t check_mntent(const char file, int mount_flags,
	165	char *mtpt, int mtlen)
	166	{
	167	errcode_t retval;
	168
2038b636 TT	169	#ifdef DEBUG
	170	retval = check_mntent_file("/tmp/mtab", file, mount_flags,
	171	mtpt, mtlen);
	172	if (retval == 0)
	173	return 0;
f0efd297	174	#endif /* DEBUG */
52db0b41 TT	175	#ifdef __linux__
	176	retval = check_mntent_file("/proc/mounts", file, mount_flags,
	177	mtpt, mtlen);
3a42fe22	178	if (retval == 0 && (*mount_flags != 0))
52db0b41	179	return 0;
f0efd297	180	#endif /* __linux__ */
5818d678 TT	181	#if defined(MOUNTED) \|\| defined(_PATH_MOUNTED)
	182	#ifndef MOUNTED
	183	#define MOUNTED _PATH_MOUNTED
	184	#endif /* MOUNTED */
52db0b41 TT	185	retval = check_mntent_file(MOUNTED, file, mount_flags, mtpt, mtlen);
52db0b41 TT	186	return retval;
efc6f628	187	#else
5818d678 TT	188	*mount_flags = 0;
	189	return 0;
	190	#endif /* defined(MOUNTED) \|\| defined(_PATH_MOUNTED) */
52db0b41 TT	191	}
52db0b41 TT	192
48e6e813 TT	193	#else
48e6e813 TT	194	#if defined(HAVE_GETMNTINFO)
50e1e10f	195
43ec8734 TT	196	static errcode_t check_getmntinfo(const char file, int mount_flags,
43ec8734 TT	197	char *mtpt, int mtlen)
50e1e10f TT	198	{
	199	struct statfs *mp;
	200	int len, n;
	201	const char *s1;
	202	char *s2;
	203
	204	n = getmntinfo(&mp, MNT_NOWAIT);
	205	if (n == 0)
	206	return errno;
	207
	208	len = sizeof(_PATH_DEV) - 1;
	209	s1 = file;
	210	if (strncmp(_PATH_DEV, s1, len) == 0)
	211	s1 += len;
efc6f628	212
50e1e10f TT	213	*mount_flags = 0;
	214	while (--n >= 0) {
	215	s2 = mp->f_mntfromname;
	216	if (strncmp(_PATH_DEV, s2, len) == 0) {
	217	s2 += len - 1;
	218	*s2 = 'r';
	219	}
	220	if (strcmp(s1, s2) == 0 \|\| strcmp(s1, &s2[1]) == 0) {
	221	*mount_flags = EXT2_MF_MOUNTED;
	222	break;
	223	}
	224	++mp;
	225	}
43ec8734 TT	226	if (mtpt)
43ec8734 TT	227	strncpy(mtpt, mp->f_mntonname, mtlen);
50e1e10f TT	228	return 0;
	229	}
	230	#endif /* HAVE_GETMNTINFO */
48e6e813	231	#endif /* HAVE_MNTENT_H */
50e1e10f	232
f0efd297 TT	233	/*
	234	* Check to see if we're dealing with the swap device.
	235	*/
	236	static int is_swap_device(const char *file)
	237	{
	238	FILE *f;
	239	char buf[1024], *cp;
	240	dev_t file_dev;
	241	struct stat st_buf;
	242	int ret = 0;
	243
	244	file_dev = 0;
	245	#ifndef __GNU__ /* The GNU hurd is broken with respect to stat devices */
	246	if ((stat(file, &st_buf) == 0) &&
	247	S_ISBLK(st_buf.st_mode))
	248	file_dev = st_buf.st_rdev;
	249	#endif /* __GNU__ */
	250
	251	if (!(f = fopen("/proc/swaps", "r")))
	252	return 0;
	253	/* Skip the first line */
d9039ae0 DL	254	if (fgets(buf, sizeof(buf), f))
d9039ae0 DL	255	while (fgets(buf, sizeof(buf), f)) {
f0efd297 TT	256	if ((cp = strchr(buf, ' ')) != NULL)
	257	*cp = 0;
	258	if ((cp = strchr(buf, '\t')) != NULL)
	259	*cp = 0;
	260	if (strcmp(buf, file) == 0) {
	261	ret++;
	262	break;
	263	}
	264	#ifndef __GNU__
	265	if (file_dev && (stat(buf, &st_buf) == 0) &&
	266	S_ISBLK(st_buf.st_mode) &&
	267	file_dev == st_buf.st_rdev) {
	268	ret++;
	269	break;
	270	}
	271	#endif /* __GNU__ */
	272	}
	273	fclose(f);
	274	return ret;
	275	}
	276
	277
50e1e10f	278	/*
2fa8f37f TT	279	* ext2fs_check_mount_point() fills determines if the device is
	280	* mounted or otherwise busy, and fills in mount_flags with one or
	281	* more of the following flags: EXT2_MF_MOUNTED, EXT2_MF_ISROOT,
	282	* EXT2_MF_READONLY, EXT2_MF_SWAP, and EXT2_MF_BUSY. If mtpt is
	283	* non-NULL, the directory where the device is mounted is copied to
	284	* where mtpt is pointing, up to mtlen characters.
43ec8734 TT	285	*/
43ec8734 TT	286	#ifdef __TURBOC__
31dbecd4	287	#pragma argsused
43ec8734 TT	288	#endif
	289	errcode_t ext2fs_check_mount_point(const char device, int mount_flags,
	290	char *mtpt, int mtlen)
	291	{
2fa8f37f TT	292	struct stat st_buf;
	293	errcode_t retval = 0;
	294	int fd;
	295
07cefe7a TT	296	if (is_swap_device(device)) {
	297	*mount_flags = EXT2_MF_MOUNTED \| EXT2_MF_SWAP;
	298	strncpy(mtpt, "<swap>", mtlen);
2fa8f37f	299	} else {
43ec8734	300	#ifdef HAVE_MNTENT_H
2fa8f37f	301	retval = check_mntent(device, mount_flags, mtpt, mtlen);
efc6f628	302	#else
43ec8734	303	#ifdef HAVE_GETMNTINFO
2fa8f37f	304	retval = check_getmntinfo(device, mount_flags, mtpt, mtlen);
43ec8734	305	#else
ed78c021	306	#ifdef __GNUC__
48e6e813	307	#warning "Can't use getmntent or getmntinfo to check for mounted filesystems!"
ed78c021	308	#endif
2fa8f37f	309	*mount_flags = 0;
43ec8734 TT	310	#endif /* HAVE_GETMNTINFO */
43ec8734 TT	311	#endif /* HAVE_MNTENT_H */
2fa8f37f TT	312	}
	313	if (retval)
	314	return retval;
	315
	316	#ifdef __linux__ /* This only works on Linux 2.6+ systems */
	317	if ((stat(device, &st_buf) != 0) \|\|
	318	!S_ISBLK(st_buf.st_mode))
	319	return 0;
	320	fd = open(device, O_RDONLY \| O_EXCL);
	321	if (fd < 0) {
	322	if (errno == EBUSY)
	323	*mount_flags \|= EXT2_MF_BUSY;
	324	} else
	325	close(fd);
406ba674	326	#endif
2fa8f37f TT	327
2fa8f37f TT	328	return 0;
43ec8734 TT	329	}
	330
	331	/*
6bd13480	332	* ext2fs_check_if_mounted() sets the mount_flags EXT2_MF_MOUNTED,
d5f858dd	333	* EXT2_MF_READONLY, and EXT2_MF_ROOT
efc6f628	334	*
50e1e10f TT	335	*/
	336	errcode_t ext2fs_check_if_mounted(const char file, int mount_flags)
	337	{
d5f858dd	338	return ext2fs_check_mount_point(file, mount_flags, NULL, 0);
50e1e10f	339	}
52db0b41 TT	340
	341	#ifdef DEBUG
	342	int main(int argc, char **argv)
	343	{
52db0b41	344	int retval, mount_flags;
a8fd6e36	345	char mntpt[80];
efc6f628	346
52db0b41 TT	347	if (argc < 2) {
	348	fprintf(stderr, "Usage: %s device\n", argv[0]);
	349	exit(1);
	350	}
	351
a8fd6e36 TT	352	mntpt[0] = 0;
	353	retval = ext2fs_check_mount_point(argv[1], &mount_flags,
	354	mntpt, sizeof(mntpt));
52db0b41 TT	355	if (retval) {
	356	com_err(argv[0], retval,
	357	"while calling ext2fs_check_if_mounted");
	358	exit(1);
	359	}
	360	printf("Device %s reports flags %02x\n", argv[1], mount_flags);
2fa8f37f TT	361	if (mount_flags & EXT2_MF_BUSY)
2fa8f37f TT	362	printf("\t%s is apparently in use.\n", argv[1]);
52db0b41	363	if (mount_flags & EXT2_MF_MOUNTED)
cc86017b	364	printf("\t%s is mounted.\n", argv[1]);
07cefe7a TT	365	if (mount_flags & EXT2_MF_SWAP)
07cefe7a TT	366	printf("\t%s is a swap device.\n", argv[1]);
52db0b41	367	if (mount_flags & EXT2_MF_READONLY)
cc86017b	368	printf("\t%s is read-only.\n", argv[1]);
52db0b41	369	if (mount_flags & EXT2_MF_ISROOT)
cc86017b	370	printf("\t%s is the root filesystem.\n", argv[1]);
a8fd6e36 TT	371	if (mntpt[0])
a8fd6e36 TT	372	printf("\t%s is mounted on %s.\n", argv[1], mntpt);
52db0b41 TT	373	exit(0);
52db0b41 TT	374	}
f0efd297	375	#endif /* DEBUG */