fs_mgr.h revision d4cea0bc16d1ad96cc6d6177232d7b339785460c 
1/*
2 * Copyright (C) 2012 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#ifndef __CORE_FS_MGR_H
18#define __CORE_FS_MGR_H
19
20#include <stdint.h>
21#include <linux/dm-ioctl.h>
22
23// Magic number at start of verity metadata
24#define VERITY_METADATA_MAGIC_NUMBER 0xb001b001
25
26// Replacement magic number at start of verity metadata to cleanly
27// turn verity off in userdebug builds.
28#define VERITY_METADATA_MAGIC_DISABLE 0x46464f56 // "VOFF"
29
30#ifdef __cplusplus
31extern "C" {
32#endif
33
34/*
35 * The entries must be kept in the same order as they were seen in the fstab.
36 * Unless explicitly requested, a lookup on mount point should always
37 * return the 1st one.
38 */
39struct fstab {
40    int num_entries;
41    struct fstab_rec *recs;
42    char *fstab_filename;
43};
44
45struct fstab_rec {
46    char *blk_device;
47    char *mount_point;
48    char *fs_type;
49    unsigned long flags;
50    char *fs_options;
51    int fs_mgr_flags;
52    char *key_loc;
53    char *verity_loc;
54    long long length;
55    char *label;
56    int partnum;
57    int swap_prio;
58    unsigned int zram_size;
59};
60
61struct fstab *fs_mgr_read_fstab(const char *fstab_path);
62void fs_mgr_free_fstab(struct fstab *fstab);
63
64#define FS_MGR_MNTALL_DEV_NEEDS_RECOVERY 3
65#define FS_MGR_MNTALL_DEV_NEEDS_ENCRYPTION 2
66#define FS_MGR_MNTALL_DEV_MIGHT_BE_ENCRYPTED 1
67#define FS_MGR_MNTALL_DEV_NOT_ENCRYPTED 0
68int fs_mgr_mount_all(struct fstab *fstab);
69
70#define FS_MGR_DOMNT_FAILED -1
71#define FS_MGR_DOMNT_BUSY -2
72int fs_mgr_do_mount(struct fstab *fstab, char *n_name, char *n_blk_device,
73                    char *tmp_mount_point);
74int fs_mgr_do_tmpfs_mount(char *n_name);
75int fs_mgr_unmount_all(struct fstab *fstab);
76int fs_mgr_get_crypt_info(struct fstab *fstab, char *key_loc,
77                          char *real_blk_device, int size);
78int fs_mgr_add_entry(struct fstab *fstab,
79                     const char *mount_point, const char *fs_type,
80                     const char *blk_device);
81struct fstab_rec *fs_mgr_get_entry_for_mount_point(struct fstab *fstab, const char *path);
82int fs_mgr_is_voldmanaged(struct fstab_rec *fstab);
83int fs_mgr_is_nonremovable(struct fstab_rec *fstab);
84int fs_mgr_is_verified(struct fstab_rec *fstab);
85int fs_mgr_is_encryptable(struct fstab_rec *fstab);
86int fs_mgr_is_noemulatedsd(struct fstab_rec *fstab);
87int fs_mgr_swapon_all(struct fstab *fstab);
88#ifdef __cplusplus
89}
90#endif
91
92#endif /* __CORE_FS_MGR_H */
93
94