1 #ifndef _UAPI_LINUX_MOUNT_H
2 #define _UAPI_LINUX_MOUNT_H
3
4 /*
5 * These are the fs-independent mount-flags: up to 32 flags are supported
6 *
7 * Usage of these is restricted within the kernel to core mount(2) code and
8 * callers of sys_mount() only. Filesystems should be using the SB_*
9 * equivalent instead.
10 */
11 #define MS_RDONLY 1 /* Mount read-only */
12 #define MS_NOSUID 2 /* Ignore suid and sgid bits */
13 #define MS_NODEV 4 /* Disallow access to device special files */
14 #define MS_NOEXEC 8 /* Disallow program execution */
15 #define MS_SYNCHRONOUS 16 /* Writes are synced at once */
16 #define MS_REMOUNT 32 /* Alter flags of a mounted FS */
17 #define MS_MANDLOCK 64 /* Allow mandatory locks on an FS */
18 #define MS_DIRSYNC 128 /* Directory modifications are synchronous */
19 #define MS_NOATIME 1024 /* Do not update access times. */
20 #define MS_NODIRATIME 2048 /* Do not update directory access times */
21 #define MS_BIND 4096
22 #define MS_MOVE 8192
23 #define MS_REC 16384
24 #define MS_VERBOSE 32768 /* War is peace. Verbosity is silence.
25 MS_VERBOSE is deprecated. */
26 #define MS_SILENT 32768
27 #define MS_POSIXACL (1<<16) /* VFS does not apply the umask */
28 #define MS_UNBINDABLE (1<<17) /* change to unbindable */
29 #define MS_PRIVATE (1<<18) /* change to private */
30 #define MS_SLAVE (1<<19) /* change to slave */
31 #define MS_SHARED (1<<20) /* change to shared */
32 #define MS_RELATIME (1<<21) /* Update atime relative to mtime/ctime. */
33 #define MS_KERNMOUNT (1<<22) /* this is a kern_mount call */
34 #define MS_I_VERSION (1<<23) /* Update inode I_version field */
35 #define MS_STRICTATIME (1<<24) /* Always perform atime updates */
36 #define MS_LAZYTIME (1<<25) /* Update the on-disk [acm]times lazily */
37
38 /* These sb flags are internal to the kernel */
39 #define MS_SUBMOUNT (1<<26)
40 #define MS_NOREMOTELOCK (1<<27)
41 #define MS_NOSEC (1<<28)
42 #define MS_BORN (1<<29)
43 #define MS_ACTIVE (1<<30)
44 #define MS_NOUSER (1<<31)
45
46 /*
47 * Superblock flags that can be altered by MS_REMOUNT
48 */
49 #define MS_RMT_MASK (MS_RDONLY|MS_SYNCHRONOUS|MS_MANDLOCK|MS_I_VERSION|\
50 MS_LAZYTIME)
51
52 /*
53 * Old magic mount flag and mask
54 */
55 #define MS_MGC_VAL 0xC0ED0000
56 #define MS_MGC_MSK 0xffff0000
57
58 /*
59 * open_tree() flags.
60 */
61 #define OPEN_TREE_CLONE 1 /* Clone the target tree and attach the clone */
62 #define OPEN_TREE_CLOEXEC O_CLOEXEC /* Close the file on execve() */
63
64 /*
65 * move_mount() flags.
66 */
67 #define MOVE_MOUNT_F_SYMLINKS 0x00000001 /* Follow symlinks on from path */
68 #define MOVE_MOUNT_F_AUTOMOUNTS 0x00000002 /* Follow automounts on from path */
69 #define MOVE_MOUNT_F_EMPTY_PATH 0x00000004 /* Empty from path permitted */
70 #define MOVE_MOUNT_T_SYMLINKS 0x00000010 /* Follow symlinks on to path */
71 #define MOVE_MOUNT_T_AUTOMOUNTS 0x00000020 /* Follow automounts on to path */
72 #define MOVE_MOUNT_T_EMPTY_PATH 0x00000040 /* Empty to path permitted */
73 #define MOVE_MOUNT__MASK 0x00000077
74
75 /*
76 * fsopen() flags.
77 */
78 #define FSOPEN_CLOEXEC 0x00000001
79
80 /*
81 * fspick() flags.
82 */
83 #define FSPICK_CLOEXEC 0x00000001
84 #define FSPICK_SYMLINK_NOFOLLOW 0x00000002
85 #define FSPICK_NO_AUTOMOUNT 0x00000004
86 #define FSPICK_EMPTY_PATH 0x00000008
87
88 /*
89 * The type of fsconfig() call made.
90 */
91 enum fsconfig_command {
92 FSCONFIG_SET_FLAG = 0, /* Set parameter, supplying no value */
93 FSCONFIG_SET_STRING = 1, /* Set parameter, supplying a string value */
94 FSCONFIG_SET_BINARY = 2, /* Set parameter, supplying a binary blob value */
95 FSCONFIG_SET_PATH = 3, /* Set parameter, supplying an object by path */
96 FSCONFIG_SET_PATH_EMPTY = 4, /* Set parameter, supplying an object by (empty) path */
97 FSCONFIG_SET_FD = 5, /* Set parameter, supplying an object by fd */
98 FSCONFIG_CMD_CREATE = 6, /* Invoke superblock creation */
99 FSCONFIG_CMD_RECONFIGURE = 7, /* Invoke superblock reconfiguration */
100 };
101
102 /*
103 * fsmount() flags.
104 */
105 #define FSMOUNT_CLOEXEC 0x00000001
106
107 /*
108 * Mount attributes.
109 */
110 #define MOUNT_ATTR_RDONLY 0x00000001 /* Mount read-only */
111 #define MOUNT_ATTR_NOSUID 0x00000002 /* Ignore suid and sgid bits */
112 #define MOUNT_ATTR_NODEV 0x00000004 /* Disallow access to device special files */
113 #define MOUNT_ATTR_NOEXEC 0x00000008 /* Disallow program execution */
114 #define MOUNT_ATTR__ATIME 0x00000070 /* Setting on how atime should be updated */
115 #define MOUNT_ATTR_RELATIME 0x00000000 /* - Update atime relative to mtime/ctime. */
116 #define MOUNT_ATTR_NOATIME 0x00000010 /* - Do not update access times. */
117 #define MOUNT_ATTR_STRICTATIME 0x00000020 /* - Always perform atime updates */
118 #define MOUNT_ATTR_NODIRATIME 0x00000080 /* Do not update directory access times */
119
120 #endif /* _UAPI_LINUX_MOUNT_H */