Diff of /trunk/mkinitrd-magellan/busybox/libbb/find_mount_point.c

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	revision 983 by niro, Fri Apr 24 18:33:46 2009 UTC	revision 984 by niro, Sun May 30 11:32:42 2010 UTC
#	Line 17	Line 17
17	* Given any other file (or directory), find the mount table entry for its	* Given any other file (or directory), find the mount table entry for its
18	* filesystem.	* filesystem.
19	*/	*/
20	struct mntent* FAST_FUNC find_mount_point(const char *name, const char *table)	struct mntent* FAST_FUNC find_mount_point(const char *name, int subdir_too)
21	{	{
22	struct stat s;	struct stat s;
23	dev_t mountDevice;	FILE *mtab_fp;
	FILE *mountTable;
24	struct mntent *mountEntry;	struct mntent *mountEntry;
25		dev_t devno_of_name;
26		bool block_dev;
27
28	if (stat(name, &s) != 0)	if (stat(name, &s) != 0)
29	return 0;	return NULL;
30
31	if ((s.st_mode & S_IFMT) == S_IFBLK)	devno_of_name = s.st_dev;
32	mountDevice = s.st_rdev;	block_dev = 0;
33	else	if (S_ISBLK(s.st_mode)) {
34	mountDevice = s.st_dev;	devno_of_name = s.st_rdev;
35		block_dev = 1;
36		}
37
38		mtab_fp = setmntent(bb_path_mtab_file, "r");
39		if (!mtab_fp)
40		return NULL;
41
42	mountTable = setmntent(table ? table : bb_path_mtab_file, "r");	while ((mountEntry = getmntent(mtab_fp)) != NULL) {
43	if (!mountTable)	/* rootfs mount in Linux 2.6 exists always,
44	return 0;	* and it makes sense to always ignore it.
45		* Otherwise people can't reference their "real" root! */
46		if (strcmp(mountEntry->mnt_fsname, "rootfs") == 0)
47		continue;
48
	while ((mountEntry = getmntent(mountTable)) != 0) {
49	if (strcmp(name, mountEntry->mnt_dir) == 0	if (strcmp(name, mountEntry->mnt_dir) == 0
50	|| strcmp(name, mountEntry->mnt_fsname) == 0	|| strcmp(name, mountEntry->mnt_fsname) == 0
51	) { /* String match. */	) { /* String match. */
52	break;	break;
53	}	}
54	if (stat(mountEntry->mnt_fsname, &s) == 0 && s.st_rdev == mountDevice) /* Match the device. */
55		if (!(subdir_too || block_dev))
56		continue;
57
58		/* Is device's dev_t == name's dev_t? */
59		if (stat(mountEntry->mnt_fsname, &s) == 0 && s.st_rdev == devno_of_name)
60	break;	break;
61	if (stat(mountEntry->mnt_dir, &s) == 0 && s.st_dev == mountDevice) /* Match the directory's mount point. */	/* Match the directory's mount point. */
62		if (stat(mountEntry->mnt_dir, &s) == 0 && s.st_dev == devno_of_name)
63	break;	break;
64	}	}
65	endmntent(mountTable);	endmntent(mtab_fp);
66
67	return mountEntry;	return mountEntry;
68	}	}

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