1/* Header file for mounting/unmount Linux filesystems.
2 Copyright (C) 1996-2020 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <https://www.gnu.org/licenses/>. */
18
19/* This is taken from /usr/include/linux/fs.h. */
20
21#ifndef _SYS_MOUNT_H
22#define _SYS_MOUNT_H 1
23
24#include <features.h>
25#include <sys/ioctl.h>
26
27#define BLOCK_SIZE 1024
28#define BLOCK_SIZE_BITS 10
29
30
31/* These are the fs-independent mount-flags: up to 16 flags are
32 supported */
33enum
34{
35 MS_RDONLY = 1, /* Mount read-only. */
36#define MS_RDONLY MS_RDONLY
37 MS_NOSUID = 2, /* Ignore suid and sgid bits. */
38#define MS_NOSUID MS_NOSUID
39 MS_NODEV = 4, /* Disallow access to device special files. */
40#define MS_NODEV MS_NODEV
41 MS_NOEXEC = 8, /* Disallow program execution. */
42#define MS_NOEXEC MS_NOEXEC
43 MS_SYNCHRONOUS = 16, /* Writes are synced at once. */
44#define MS_SYNCHRONOUS MS_SYNCHRONOUS
45 MS_REMOUNT = 32, /* Alter flags of a mounted FS. */
46#define MS_REMOUNT MS_REMOUNT
47 MS_MANDLOCK = 64, /* Allow mandatory locks on an FS. */
48#define MS_MANDLOCK MS_MANDLOCK
49 MS_DIRSYNC = 128, /* Directory modifications are synchronous. */
50#define MS_DIRSYNC MS_DIRSYNC
51 MS_NOATIME = 1024, /* Do not update access times. */
52#define MS_NOATIME MS_NOATIME
53 MS_NODIRATIME = 2048, /* Do not update directory access times. */
54#define MS_NODIRATIME MS_NODIRATIME
55 MS_BIND = 4096, /* Bind directory at different place. */
56#define MS_BIND MS_BIND
57 MS_MOVE = 8192,
58#define MS_MOVE MS_MOVE
59 MS_REC = 16384,
60#define MS_REC MS_REC
61 MS_SILENT = 32768,
62#define MS_SILENT MS_SILENT
63 MS_POSIXACL = 1 << 16, /* VFS does not apply the umask. */
64#define MS_POSIXACL MS_POSIXACL
65 MS_UNBINDABLE = 1 << 17, /* Change to unbindable. */
66#define MS_UNBINDABLE MS_UNBINDABLE
67 MS_PRIVATE = 1 << 18, /* Change to private. */
68#define MS_PRIVATE MS_PRIVATE
69 MS_SLAVE = 1 << 19, /* Change to slave. */
70#define MS_SLAVE MS_SLAVE
71 MS_SHARED = 1 << 20, /* Change to shared. */
72#define MS_SHARED MS_SHARED
73 MS_RELATIME = 1 << 21, /* Update atime relative to mtime/ctime. */
74#define MS_RELATIME MS_RELATIME
75 MS_KERNMOUNT = 1 << 22, /* This is a kern_mount call. */
76#define MS_KERNMOUNT MS_KERNMOUNT
77 MS_I_VERSION = 1 << 23, /* Update inode I_version field. */
78#define MS_I_VERSION MS_I_VERSION
79 MS_STRICTATIME = 1 << 24, /* Always perform atime updates. */
80#define MS_STRICTATIME MS_STRICTATIME
81 MS_LAZYTIME = 1 << 25, /* Update the on-disk [acm]times lazily. */
82#define MS_LAZYTIME MS_LAZYTIME
83 MS_ACTIVE = 1 << 30,
84#define MS_ACTIVE MS_ACTIVE
85 MS_NOUSER = 1 << 31
86#define MS_NOUSER MS_NOUSER
87};
88
89/* Flags that can be altered by MS_REMOUNT */
90#define MS_RMT_MASK (MS_RDONLY|MS_SYNCHRONOUS|MS_MANDLOCK|MS_I_VERSION \
91 |MS_LAZYTIME)
92
93
94/* Magic mount flag number. Has to be or-ed to the flag values. */
95
96#define MS_MGC_VAL 0xc0ed0000 /* Magic flag number to indicate "new" flags */
97#define MS_MGC_MSK 0xffff0000 /* Magic flag number mask */
98
99
100/* The read-only stuff doesn't really belong here, but any other place
101 is probably as bad and I don't want to create yet another include
102 file. */
103
104#define BLKROSET _IO(0x12, 93) /* Set device read-only (0 = read-write). */
105#define BLKROGET _IO(0x12, 94) /* Get read-only status (0 = read_write). */
106#define BLKRRPART _IO(0x12, 95) /* Re-read partition table. */
107#define BLKGETSIZE _IO(0x12, 96) /* Return device size. */
108#define BLKFLSBUF _IO(0x12, 97) /* Flush buffer cache. */
109#define BLKRASET _IO(0x12, 98) /* Set read ahead for block device. */
110#define BLKRAGET _IO(0x12, 99) /* Get current read ahead setting. */
111#define BLKFRASET _IO(0x12,100) /* Set filesystem read-ahead. */
112#define BLKFRAGET _IO(0x12,101) /* Get filesystem read-ahead. */
113#define BLKSECTSET _IO(0x12,102) /* Set max sectors per request. */
114#define BLKSECTGET _IO(0x12,103) /* Get max sectors per request. */
115#define BLKSSZGET _IO(0x12,104) /* Get block device sector size. */
116#define BLKBSZGET _IOR(0x12,112,size_t)
117#define BLKBSZSET _IOW(0x12,113,size_t)
118#define BLKGETSIZE64 _IOR(0x12,114,size_t) /* return device size. */
119
120
121/* Possible value for FLAGS parameter of `umount2'. */
122enum
123{
124 MNT_FORCE = 1, /* Force unmounting. */
125#define MNT_FORCE MNT_FORCE
126 MNT_DETACH = 2, /* Just detach from the tree. */
127#define MNT_DETACH MNT_DETACH
128 MNT_EXPIRE = 4, /* Mark for expiry. */
129#define MNT_EXPIRE MNT_EXPIRE
130 UMOUNT_NOFOLLOW = 8 /* Don't follow symlink on umount. */
131#define UMOUNT_NOFOLLOW UMOUNT_NOFOLLOW
132};
133
134
135__BEGIN_DECLS
136
137/* Mount a filesystem. */
138extern int mount (const char *__special_file, const char *__dir,
139 const char *__fstype, unsigned long int __rwflag,
140 const void *__data) __THROW;
141
142/* Unmount a filesystem. */
143extern int umount (const char *__special_file) __THROW;
144
145/* Unmount a filesystem. Force unmounting if FLAGS is set to MNT_FORCE. */
146extern int umount2 (const char *__special_file, int __flags) __THROW;
147
148__END_DECLS
149
150#endif /* _SYS_MOUNT_H */
151