* Given any other file (or directory), find the mount table entry for its
* filesystem.
*/
-struct mntent *find_mount_point(const char *name, const char *table)
+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 0;
+ return NULL;
- if ((s.st_mode & S_IFMT) == S_IFBLK)
- 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(table ? table : bb_path_mtab_file, "r");
- if (!mountTable)
- return 0;
+ 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! */
+ if (strcmp(mountEntry->mnt_fsname, "rootfs") == 0)
+ continue;
- while ((mountEntry = getmntent(mountTable)) != 0) {
if (strcmp(name, mountEntry->mnt_dir) == 0
|| strcmp(name, mountEntry->mnt_fsname) == 0
) { /* String match. */
break;
}
- if (stat(mountEntry->mnt_fsname, &s) == 0 && s.st_rdev == mountDevice) /* Match the device. */
+
+ 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;
- if (stat(mountEntry->mnt_dir, &s) == 0 && s.st_dev == mountDevice) /* Match the directory's mount point. */
+ /* Match the directory's mount point. */
+ if (stat(mountEntry->mnt_dir, &s) == 0 && s.st_dev == devno_of_name)
break;
}
- endmntent(mountTable);
+ endmntent(mtab_fp);
+
return mountEntry;
}