1#ifndef _LINUX_MOUNT_H
2#define _LINUX_MOUNT_H
3
4#include <linux/types.h>
5
6/*
7 * These are the fs-independent mount-flags: up to 32 flags are supported
8 *
9 * Usage of these is restricted within the kernel to core mount(2) code and
10 * callers of sys_mount() only. Filesystems should be using the SB_*
11 * equivalent instead.
12 */
13#define MS_RDONLY 1 /* Mount read-only */
14#define MS_NOSUID 2 /* Ignore suid and sgid bits */
15#define MS_NODEV 4 /* Disallow access to device special files */
16#define MS_NOEXEC 8 /* Disallow program execution */
17#define MS_SYNCHRONOUS 16 /* Writes are synced at once */
18#define MS_REMOUNT 32 /* Alter flags of a mounted FS */
19#define MS_MANDLOCK 64 /* Allow mandatory locks on an FS */
20#define MS_DIRSYNC 128 /* Directory modifications are synchronous */
21#define MS_NOSYMFOLLOW 256 /* Do not follow symlinks */
22#define MS_NOATIME 1024 /* Do not update access times. */
23#define MS_NODIRATIME 2048 /* Do not update directory access times */
24#define MS_BIND 4096
25#define MS_MOVE 8192
26#define MS_REC 16384
27#define MS_VERBOSE 32768 /* War is peace. Verbosity is silence.
28 MS_VERBOSE is deprecated. */
29#define MS_SILENT 32768
30#define MS_POSIXACL (1<<16) /* VFS does not apply the umask */
31#define MS_UNBINDABLE (1<<17) /* change to unbindable */
32#define MS_PRIVATE (1<<18) /* change to private */
33#define MS_SLAVE (1<<19) /* change to slave */
34#define MS_SHARED (1<<20) /* change to shared */
35#define MS_RELATIME (1<<21) /* Update atime relative to mtime/ctime. */
36#define MS_KERNMOUNT (1<<22) /* this is a kern_mount call */
37#define MS_I_VERSION (1<<23) /* Update inode I_version field */
38#define MS_STRICTATIME (1<<24) /* Always perform atime updates */
39#define MS_LAZYTIME (1<<25) /* Update the on-disk [acm]times lazily */
40
41/* These sb flags are internal to the kernel */
42#define MS_SUBMOUNT (1<<26)
43#define MS_NOREMOTELOCK (1<<27)
44#define MS_NOSEC (1<<28)
45#define MS_BORN (1<<29)
46#define MS_ACTIVE (1<<30)
47#define MS_NOUSER (1<<31)
48
49/*
50 * Superblock flags that can be altered by MS_REMOUNT
51 */
52#define MS_RMT_MASK (MS_RDONLY|MS_SYNCHRONOUS|MS_MANDLOCK|MS_I_VERSION|\
53 MS_LAZYTIME)
54
55/*
56 * Old magic mount flag and mask
57 */
58#define MS_MGC_VAL 0xC0ED0000
59#define MS_MGC_MSK 0xffff0000
60
61/*
62 * open_tree() flags.
63 */
64#define OPEN_TREE_CLONE 1 /* Clone the target tree and attach the clone */
65#define OPEN_TREE_CLOEXEC O_CLOEXEC /* Close the file on execve() */
66
67/*
68 * move_mount() flags.
69 */
70#define MOVE_MOUNT_F_SYMLINKS 0x00000001 /* Follow symlinks on from path */
71#define MOVE_MOUNT_F_AUTOMOUNTS 0x00000002 /* Follow automounts on from path */
72#define MOVE_MOUNT_F_EMPTY_PATH 0x00000004 /* Empty from path permitted */
73#define MOVE_MOUNT_T_SYMLINKS 0x00000010 /* Follow symlinks on to path */
74#define MOVE_MOUNT_T_AUTOMOUNTS 0x00000020 /* Follow automounts on to path */
75#define MOVE_MOUNT_T_EMPTY_PATH 0x00000040 /* Empty to path permitted */
76#define MOVE_MOUNT_SET_GROUP 0x00000100 /* Set sharing group instead */
77#define MOVE_MOUNT__MASK 0x00000177
78
79/*
80 * fsopen() flags.
81 */
82#define FSOPEN_CLOEXEC 0x00000001
83
84/*
85 * fspick() flags.
86 */
87#define FSPICK_CLOEXEC 0x00000001
88#define FSPICK_SYMLINK_NOFOLLOW 0x00000002
89#define FSPICK_NO_AUTOMOUNT 0x00000004
90#define FSPICK_EMPTY_PATH 0x00000008
91
92/*
93 * The type of fsconfig() call made.
94 */
95enum fsconfig_command {
96 FSCONFIG_SET_FLAG = 0, /* Set parameter, supplying no value */
97 FSCONFIG_SET_STRING = 1, /* Set parameter, supplying a string value */
98 FSCONFIG_SET_BINARY = 2, /* Set parameter, supplying a binary blob value */
99 FSCONFIG_SET_PATH = 3, /* Set parameter, supplying an object by path */
100 FSCONFIG_SET_PATH_EMPTY = 4, /* Set parameter, supplying an object by (empty) path */
101 FSCONFIG_SET_FD = 5, /* Set parameter, supplying an object by fd */
102 FSCONFIG_CMD_CREATE = 6, /* Invoke superblock creation */
103 FSCONFIG_CMD_RECONFIGURE = 7, /* Invoke superblock reconfiguration */
104};
105
106/*
107 * fsmount() flags.
108 */
109#define FSMOUNT_CLOEXEC 0x00000001
110
111/*
112 * Mount attributes.
113 */
114#define MOUNT_ATTR_RDONLY 0x00000001 /* Mount read-only */
115#define MOUNT_ATTR_NOSUID 0x00000002 /* Ignore suid and sgid bits */
116#define MOUNT_ATTR_NODEV 0x00000004 /* Disallow access to device special files */
117#define MOUNT_ATTR_NOEXEC 0x00000008 /* Disallow program execution */
118#define MOUNT_ATTR__ATIME 0x00000070 /* Setting on how atime should be updated */
119#define MOUNT_ATTR_RELATIME 0x00000000 /* - Update atime relative to mtime/ctime. */
120#define MOUNT_ATTR_NOATIME 0x00000010 /* - Do not update access times. */
121#define MOUNT_ATTR_STRICTATIME 0x00000020 /* - Always perform atime updates */
122#define MOUNT_ATTR_NODIRATIME 0x00000080 /* Do not update directory access times */
123#define MOUNT_ATTR_IDMAP 0x00100000 /* Idmap mount to @userns_fd in struct mount_attr. */
124#define MOUNT_ATTR_NOSYMFOLLOW 0x00200000 /* Do not follow symlinks */
125
126/*
127 * mount_setattr()
128 */
129struct mount_attr {
130 __u64 attr_set;
131 __u64 attr_clr;
132 __u64 propagation;
133 __u64 userns_fd;
134};
135
136/* List of all mount_attr versions. */
137#define MOUNT_ATTR_SIZE_VER0 32 /* sizeof first published struct */
138
139#endif /* _LINUX_MOUNT_H */
140

source code of include/linux/mount.h