summaryrefslogtreecommitdiff
path: root/tools/perf/trace/beauty/include/uapi/linux/mount.h
blob: 225bc366ffcbf0319929e2f55f1fbea88e4d7b81 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
#ifndef _UAPI_LINUX_MOUNT_H
#define _UAPI_LINUX_MOUNT_H

#include <linux/types.h>

/*
 * These are the fs-independent mount-flags: up to 32 flags are supported
 *
 * Usage of these is restricted within the kernel to core mount(2) code and
 * callers of sys_mount() only.  Filesystems should be using the SB_*
 * equivalent instead.
 */
#define MS_RDONLY	 1	/* Mount read-only */
#define MS_NOSUID	 2	/* Ignore suid and sgid bits */
#define MS_NODEV	 4	/* Disallow access to device special files */
#define MS_NOEXEC	 8	/* Disallow program execution */
#define MS_SYNCHRONOUS	16	/* Writes are synced at once */
#define MS_REMOUNT	32	/* Alter flags of a mounted FS */
#define MS_MANDLOCK	64	/* Allow mandatory locks on an FS */
#define MS_DIRSYNC	128	/* Directory modifications are synchronous */
#define MS_NOSYMFOLLOW	256	/* Do not follow symlinks */
#define MS_NOATIME	1024	/* Do not update access times. */
#define MS_NODIRATIME	2048	/* Do not update directory access times */
#define MS_BIND		4096
#define MS_MOVE		8192
#define MS_REC		16384
#define MS_VERBOSE	32768	/* War is peace. Verbosity is silence.
				   MS_VERBOSE is deprecated. */
#define MS_SILENT	32768
#define MS_POSIXACL	(1<<16)	/* VFS does not apply the umask */
#define MS_UNBINDABLE	(1<<17)	/* change to unbindable */
#define MS_PRIVATE	(1<<18)	/* change to private */
#define MS_SLAVE	(1<<19)	/* change to slave */
#define MS_SHARED	(1<<20)	/* change to shared */
#define MS_RELATIME	(1<<21)	/* Update atime relative to mtime/ctime. */
#define MS_KERNMOUNT	(1<<22) /* this is a kern_mount call */
#define MS_I_VERSION	(1<<23) /* Update inode I_version field */
#define MS_STRICTATIME	(1<<24) /* Always perform atime updates */
#define MS_LAZYTIME	(1<<25) /* Update the on-disk [acm]times lazily */

/* These sb flags are internal to the kernel */
#define MS_SUBMOUNT     (1<<26)
#define MS_NOREMOTELOCK	(1<<27)
#define MS_NOSEC	(1<<28)
#define MS_BORN		(1<<29)
#define MS_ACTIVE	(1<<30)
#define MS_NOUSER	(1<<31)

/*
 * Superblock flags that can be altered by MS_REMOUNT
 */
#define MS_RMT_MASK	(MS_RDONLY|MS_SYNCHRONOUS|MS_MANDLOCK|MS_I_VERSION|\
			 MS_LAZYTIME)

/*
 * Old magic mount flag and mask
 */
#define MS_MGC_VAL 0xC0ED0000
#define MS_MGC_MSK 0xffff0000

/*
 * open_tree() flags.
 */
#define OPEN_TREE_CLONE		1		/* Clone the target tree and attach the clone */
#define OPEN_TREE_CLOEXEC	O_CLOEXEC	/* Close the file on execve() */

/*
 * move_mount() flags.
 */
#define MOVE_MOUNT_F_SYMLINKS		0x00000001 /* Follow symlinks on from path */
#define MOVE_MOUNT_F_AUTOMOUNTS		0x00000002 /* Follow automounts on from path */
#define MOVE_MOUNT_F_EMPTY_PATH		0x00000004 /* Empty from path permitted */
#define MOVE_MOUNT_T_SYMLINKS		0x00000010 /* Follow symlinks on to path */
#define MOVE_MOUNT_T_AUTOMOUNTS		0x00000020 /* Follow automounts on to path */
#define MOVE_MOUNT_T_EMPTY_PATH		0x00000040 /* Empty to path permitted */
#define MOVE_MOUNT_SET_GROUP		0x00000100 /* Set sharing group instead */
#define MOVE_MOUNT_BENEATH		0x00000200 /* Mount beneath top mount */
#define MOVE_MOUNT__MASK		0x00000377

/*
 * fsopen() flags.
 */
#define FSOPEN_CLOEXEC		0x00000001

/*
 * fspick() flags.
 */
#define FSPICK_CLOEXEC		0x00000001
#define FSPICK_SYMLINK_NOFOLLOW	0x00000002
#define FSPICK_NO_AUTOMOUNT	0x00000004
#define FSPICK_EMPTY_PATH	0x00000008

/*
 * The type of fsconfig() call made.
 */
enum fsconfig_command {
	FSCONFIG_SET_FLAG	= 0,	/* Set parameter, supplying no value */
	FSCONFIG_SET_STRING	= 1,	/* Set parameter, supplying a string value */
	FSCONFIG_SET_BINARY	= 2,	/* Set parameter, supplying a binary blob value */
	FSCONFIG_SET_PATH	= 3,	/* Set parameter, supplying an object by path */
	FSCONFIG_SET_PATH_EMPTY	= 4,	/* Set parameter, supplying an object by (empty) path */
	FSCONFIG_SET_FD		= 5,	/* Set parameter, supplying an object by fd */
	FSCONFIG_CMD_CREATE	= 6,	/* Create new or reuse existing superblock */
	FSCONFIG_CMD_RECONFIGURE = 7,	/* Invoke superblock reconfiguration */
	FSCONFIG_CMD_CREATE_EXCL = 8,	/* Create new superblock, fail if reusing existing superblock */
};

/*
 * fsmount() flags.
 */
#define FSMOUNT_CLOEXEC		0x00000001

/*
 * Mount attributes.
 */
#define MOUNT_ATTR_RDONLY	0x00000001 /* Mount read-only */
#define MOUNT_ATTR_NOSUID	0x00000002 /* Ignore suid and sgid bits */
#define MOUNT_ATTR_NODEV	0x00000004 /* Disallow access to device special files */
#define MOUNT_ATTR_NOEXEC	0x00000008 /* Disallow program execution */
#define MOUNT_ATTR__ATIME	0x00000070 /* Setting on how atime should be updated */
#define MOUNT_ATTR_RELATIME	0x00000000 /* - Update atime relative to mtime/ctime. */
#define MOUNT_ATTR_NOATIME	0x00000010 /* - Do not update access times. */
#define MOUNT_ATTR_STRICTATIME	0x00000020 /* - Always perform atime updates */
#define MOUNT_ATTR_NODIRATIME	0x00000080 /* Do not update directory access times */
#define MOUNT_ATTR_IDMAP	0x00100000 /* Idmap mount to @userns_fd in struct mount_attr. */
#define MOUNT_ATTR_NOSYMFOLLOW	0x00200000 /* Do not follow symlinks */

/*
 * mount_setattr()
 */
struct mount_attr {
	__u64 attr_set;
	__u64 attr_clr;
	__u64 propagation;
	__u64 userns_fd;
};

/* List of all mount_attr versions. */
#define MOUNT_ATTR_SIZE_VER0	32 /* sizeof first published struct */


/*
 * Structure for getting mount/superblock/filesystem info with statmount(2).
 *
 * The interface is similar to statx(2): individual fields or groups can be
 * selected with the @mask argument of statmount().  Kernel will set the @mask
 * field according to the supported fields.
 *
 * If string fields are selected, then the caller needs to pass a buffer that
 * has space after the fixed part of the structure.  Nul terminated strings are
 * copied there and offsets relative to @str are stored in the relevant fields.
 * If the buffer is too small, then EOVERFLOW is returned.  The actually used
 * size is returned in @size.
 */
struct statmount {
	__u32 size;		/* Total size, including strings */
	__u32 mnt_opts;		/* [str] Mount options of the mount */
	__u64 mask;		/* What results were written */
	__u32 sb_dev_major;	/* Device ID */
	__u32 sb_dev_minor;
	__u64 sb_magic;		/* ..._SUPER_MAGIC */
	__u32 sb_flags;		/* SB_{RDONLY,SYNCHRONOUS,DIRSYNC,LAZYTIME} */
	__u32 fs_type;		/* [str] Filesystem type */
	__u64 mnt_id;		/* Unique ID of mount */
	__u64 mnt_parent_id;	/* Unique ID of parent (for root == mnt_id) */
	__u32 mnt_id_old;	/* Reused IDs used in proc/.../mountinfo */
	__u32 mnt_parent_id_old;
	__u64 mnt_attr;		/* MOUNT_ATTR_... */
	__u64 mnt_propagation;	/* MS_{SHARED,SLAVE,PRIVATE,UNBINDABLE} */
	__u64 mnt_peer_group;	/* ID of shared peer group */
	__u64 mnt_master;	/* Mount receives propagation from this ID */
	__u64 propagate_from;	/* Propagation from in current namespace */
	__u32 mnt_root;		/* [str] Root of mount relative to root of fs */
	__u32 mnt_point;	/* [str] Mountpoint relative to current root */
	__u64 mnt_ns_id;	/* ID of the mount namespace */
	__u64 __spare2[49];
	char str[];		/* Variable size part containing strings */
};

/*
 * Structure for passing mount ID and miscellaneous parameters to statmount(2)
 * and listmount(2).
 *
 * For statmount(2) @param represents the request mask.
 * For listmount(2) @param represents the last listed mount id (or zero).
 */
struct mnt_id_req {
	__u32 size;
	__u32 spare;
	__u64 mnt_id;
	__u64 param;
	__u64 mnt_ns_id;
};

/* List of all mnt_id_req versions. */
#define MNT_ID_REQ_SIZE_VER0	24 /* sizeof first published struct */
#define MNT_ID_REQ_SIZE_VER1	32 /* sizeof second published struct */

/*
 * @mask bits for statmount(2)
 */
#define STATMOUNT_SB_BASIC		0x00000001U     /* Want/got sb_... */
#define STATMOUNT_MNT_BASIC		0x00000002U	/* Want/got mnt_... */
#define STATMOUNT_PROPAGATE_FROM	0x00000004U	/* Want/got propagate_from */
#define STATMOUNT_MNT_ROOT		0x00000008U	/* Want/got mnt_root  */
#define STATMOUNT_MNT_POINT		0x00000010U	/* Want/got mnt_point */
#define STATMOUNT_FS_TYPE		0x00000020U	/* Want/got fs_type */
#define STATMOUNT_MNT_NS_ID		0x00000040U	/* Want/got mnt_ns_id */
#define STATMOUNT_MNT_OPTS		0x00000080U	/* Want/got mnt_opts */

/*
 * Special @mnt_id values that can be passed to listmount
 */
#define LSMT_ROOT		0xffffffffffffffff	/* root mount */
#define LISTMOUNT_REVERSE	(1 << 0) /* List later mounts first */

#endif /* _UAPI_LINUX_MOUNT_H */