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69 lines
1.7 KiB
C
69 lines
1.7 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Utility routines.
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*
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* Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
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*
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* Licensed under GPLv2 or later, see file LICENSE in this source tree.
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*/
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#include "libbb.h"
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#include <mntent.h>
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/*
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* Given a block device, find the mount table entry if that block device
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* is mounted.
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*
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* Given any other file (or directory), find the mount table entry for its
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* filesystem.
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*/
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struct mntent* FAST_FUNC find_mount_point(const char *name, int subdir_too)
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{
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struct stat s;
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FILE *mtab_fp;
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struct mntent *mountEntry;
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dev_t devno_of_name;
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bool block_dev;
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if (stat(name, &s) != 0)
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return NULL;
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devno_of_name = s.st_dev;
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block_dev = 0;
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/* Why S_ISCHR? - UBI volumes use char devices, not block */
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if (S_ISBLK(s.st_mode) || S_ISCHR(s.st_mode)) {
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devno_of_name = s.st_rdev;
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block_dev = 1;
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}
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mtab_fp = setmntent(bb_path_mtab_file, "r");
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if (!mtab_fp)
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return NULL;
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while ((mountEntry = getmntent(mtab_fp)) != NULL) {
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/* rootfs mount in Linux 2.6 exists always,
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* and it makes sense to always ignore it.
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* Otherwise people can't reference their "real" root! */
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if (ENABLE_FEATURE_SKIP_ROOTFS && strcmp(mountEntry->mnt_fsname, "rootfs") == 0)
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continue;
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if (strcmp(name, mountEntry->mnt_dir) == 0
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|| strcmp(name, mountEntry->mnt_fsname) == 0
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) { /* String match. */
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break;
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}
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if (!(subdir_too || block_dev))
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continue;
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/* Is device's dev_t == name's dev_t? */
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if (stat(mountEntry->mnt_fsname, &s) == 0 && s.st_rdev == devno_of_name)
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break;
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/* Match the directory's mount point. */
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if (stat(mountEntry->mnt_dir, &s) == 0 && s.st_dev == devno_of_name)
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break;
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}
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endmntent(mtab_fp);
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return mountEntry;
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}
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