/* vi: set sw=4 ts=4: */ /* * Utility routines. * * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org> * * Licensed under GPLv2 or later, see file LICENSE in this tarball for details. */ #include "libbb.h" #include <mntent.h> /* * Given a block device, find the mount table entry if that block device * is mounted. * * Given any other file (or directory), find the mount table entry for its * filesystem. */ struct mntent* FAST_FUNC find_mount_point(const char *name, int subdir_too) { struct stat s; FILE *mtab_fp; struct mntent *mountEntry; dev_t devno_of_name; bool block_dev; if (stat(name, &s) != 0) return NULL; 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; 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; if (strcmp(name, mountEntry->mnt_dir) == 0 || strcmp(name, mountEntry->mnt_fsname) == 0 ) { /* String match. */ break; } 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 == devno_of_name) break; } endmntent(mtab_fp); return mountEntry; }