fix mountpoint test to not prevemt mkfs_xxx from making image in any file
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git a/libbb/find_mount_point.c b/libbb/find_mount_point.c
index 12b2cfc..bcb18ef 100644
--- a/libbb/find_mount_point.c
+++ b/libbb/find_mount_point.c
@@ -17,27 +17,29 @@
* Given any other file (or directory), find the mount table entry for its
* filesystem.
*/
-struct mntent* FAST_FUNC find_mount_point(const char *name)
+struct mntent* FAST_FUNC find_mount_point(const char *name, int subdir_too)
{
struct stat s;
- dev_t mountDevice;
- FILE *mountTable;
+ FILE *mtab_fp;
struct mntent *mountEntry;
+ dev_t devno_of_name;
+ bool block_dev;
if (stat(name, &s) != 0)
return NULL;
- if (S_ISBLK(s.st_mode))
- mountDevice = s.st_rdev;
- else
- mountDevice = s.st_dev;
+ devno_of_name = s.st_dev;
+ block_dev = 0;
+ if (S_ISBLK(s.st_mode)) {
+ devno_of_name = s.st_rdev;
+ block_dev = 1;
+ }
+ mtab_fp = setmntent(bb_path_mtab_file, "r");
+ if (!mtab_fp)
+ return NULL;
- mountTable = setmntent(bb_path_mtab_file, "r");
- if (!mountTable)
- return 0;
-
- while ((mountEntry = getmntent(mountTable)) != NULL) {
+ while ((mountEntry = getmntent(mtab_fp)) != NULL) {
/* rootfs mount in Linux 2.6 exists always,
* and it makes sense to always ignore it.
* Otherwise people can't reference their "real" root! */
@@ -49,13 +51,18 @@
) { /* String match. */
break;
}
- /* Match the device. */
- if (stat(mountEntry->mnt_fsname, &s) == 0 && s.st_rdev == mountDevice)
+
+ if (!(subdir_too || block_dev))
+ continue;
+
+ /* Is device's dev_t == name's dev_t? */
+ if (stat(mountEntry->mnt_fsname, &s) == 0 && s.st_rdev == devno_of_name)
break;
/* Match the directory's mount point. */
- if (stat(mountEntry->mnt_dir, &s) == 0 && s.st_dev == mountDevice)
+ if (stat(mountEntry->mnt_dir, &s) == 0 && s.st_dev == devno_of_name)
break;
}
- endmntent(mountTable);
+ endmntent(mtab_fp);
+
return mountEntry;
}