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253 lines · 6.8 KiB

1/* SPDX-License-Identifier: GPL-2.0 */
2
3#ifndef __SAMPLES_VFS_H
4#define __SAMPLES_VFS_H
5
6#include <errno.h>
7#include <linux/types.h>
8#include <sys/ioctl.h>
9#include <sys/syscall.h>
10
11#define die_errno(format, ...) \
12 do { \
13 fprintf(stderr, "%m | %s: %d: %s: " format "\n", __FILE__, \
14 __LINE__, __func__, ##__VA_ARGS__); \
15 exit(EXIT_FAILURE); \
16 } while (0)
17
18struct statmount {
19 __u32 size; /* Total size, including strings */
20 __u32 mnt_opts; /* [str] Options (comma separated, escaped) */
21 __u64 mask; /* What results were written */
22 __u32 sb_dev_major; /* Device ID */
23 __u32 sb_dev_minor;
24 __u64 sb_magic; /* ..._SUPER_MAGIC */
25 __u32 sb_flags; /* SB_{RDONLY,SYNCHRONOUS,DIRSYNC,LAZYTIME} */
26 __u32 fs_type; /* [str] Filesystem type */
27 __u64 mnt_id; /* Unique ID of mount */
28 __u64 mnt_parent_id; /* Unique ID of parent (for root == mnt_id) */
29 __u32 mnt_id_old; /* Reused IDs used in proc/.../mountinfo */
30 __u32 mnt_parent_id_old;
31 __u64 mnt_attr; /* MOUNT_ATTR_... */
32 __u64 mnt_propagation; /* MS_{SHARED,SLAVE,PRIVATE,UNBINDABLE} */
33 __u64 mnt_peer_group; /* ID of shared peer group */
34 __u64 mnt_master; /* Mount receives propagation from this ID */
35 __u64 propagate_from; /* Propagation from in current namespace */
36 __u32 mnt_root; /* [str] Root of mount relative to root of fs */
37 __u32 mnt_point; /* [str] Mountpoint relative to current root */
38 __u64 mnt_ns_id; /* ID of the mount namespace */
39 __u32 fs_subtype; /* [str] Subtype of fs_type (if any) */
40 __u32 sb_source; /* [str] Source string of the mount */
41 __u32 opt_num; /* Number of fs options */
42 __u32 opt_array; /* [str] Array of nul terminated fs options */
43 __u32 opt_sec_num; /* Number of security options */
44 __u32 opt_sec_array; /* [str] Array of nul terminated security options */
45 __u32 mnt_uidmap_num; /* Number of uid mappings */
46 __u32 mnt_uidmap; /* [str] Array of uid mappings */
47 __u32 mnt_gidmap_num; /* Number of gid mappings */
48 __u32 mnt_gidmap; /* [str] Array of gid mappings */
49 __u64 __spare2[44];
50 char str[]; /* Variable size part containing strings */
51};
52
53struct mnt_id_req {
54 __u32 size;
55 __u32 spare;
56 __u64 mnt_id;
57 __u64 param;
58 __u64 mnt_ns_id;
59};
60
61#ifndef MNT_ID_REQ_SIZE_VER0
62#define MNT_ID_REQ_SIZE_VER0 24 /* sizeof first published struct */
63#endif
64
65#ifndef MNT_ID_REQ_SIZE_VER1
66#define MNT_ID_REQ_SIZE_VER1 32 /* sizeof second published struct */
67#endif
68
69/* Get the id for a mount namespace */
70#ifndef NS_GET_MNTNS_ID
71#define NS_GET_MNTNS_ID _IO(0xb7, 0x5)
72#endif
73
74struct mnt_ns_info {
75 __u32 size;
76 __u32 nr_mounts;
77 __u64 mnt_ns_id;
78};
79
80#ifndef MNT_NS_INFO_SIZE_VER0
81#define MNT_NS_INFO_SIZE_VER0 16 /* size of first published struct */
82#endif
83
84#ifndef NS_MNT_GET_INFO
85#define NS_MNT_GET_INFO _IOR(0xb7, 10, struct mnt_ns_info)
86#endif
87
88#ifndef NS_MNT_GET_NEXT
89#define NS_MNT_GET_NEXT _IOR(0xb7, 11, struct mnt_ns_info)
90#endif
91
92#ifndef NS_MNT_GET_PREV
93#define NS_MNT_GET_PREV _IOR(0xb7, 12, struct mnt_ns_info)
94#endif
95
96#ifndef PIDFD_GET_MNT_NAMESPACE
97#define PIDFD_GET_MNT_NAMESPACE _IO(0xFF, 3)
98#endif
99
100#ifndef __NR_listmount
101#define __NR_listmount 458
102#endif
103
104#ifndef __NR_statmount
105#define __NR_statmount 457
106#endif
107
108#ifndef LSMT_ROOT
109#define LSMT_ROOT 0xffffffffffffffff /* root mount */
110#endif
111
112/* @mask bits for statmount(2) */
113#ifndef STATMOUNT_SB_BASIC
114#define STATMOUNT_SB_BASIC 0x00000001U /* Want/got sb_... */
115#endif
116
117#ifndef STATMOUNT_MNT_BASIC
118#define STATMOUNT_MNT_BASIC 0x00000002U /* Want/got mnt_... */
119#endif
120
121#ifndef STATMOUNT_PROPAGATE_FROM
122#define STATMOUNT_PROPAGATE_FROM 0x00000004U /* Want/got propagate_from */
123#endif
124
125#ifndef STATMOUNT_MNT_ROOT
126#define STATMOUNT_MNT_ROOT 0x00000008U /* Want/got mnt_root */
127#endif
128
129#ifndef STATMOUNT_MNT_POINT
130#define STATMOUNT_MNT_POINT 0x00000010U /* Want/got mnt_point */
131#endif
132
133#ifndef STATMOUNT_FS_TYPE
134#define STATMOUNT_FS_TYPE 0x00000020U /* Want/got fs_type */
135#endif
136
137#ifndef STATMOUNT_MNT_NS_ID
138#define STATMOUNT_MNT_NS_ID 0x00000040U /* Want/got mnt_ns_id */
139#endif
140
141#ifndef STATMOUNT_MNT_OPTS
142#define STATMOUNT_MNT_OPTS 0x00000080U /* Want/got mnt_opts */
143#endif
144
145#ifndef STATMOUNT_FS_SUBTYPE
146#define STATMOUNT_FS_SUBTYPE 0x00000100U /* Want/got fs_subtype */
147#endif
148
149#ifndef STATMOUNT_SB_SOURCE
150#define STATMOUNT_SB_SOURCE 0x00000200U /* Want/got sb_source */
151#endif
152
153#ifndef STATMOUNT_OPT_ARRAY
154#define STATMOUNT_OPT_ARRAY 0x00000400U /* Want/got opt_... */
155#endif
156
157#ifndef STATMOUNT_OPT_SEC_ARRAY
158#define STATMOUNT_OPT_SEC_ARRAY 0x00000800U /* Want/got opt_sec... */
159#endif
160
161#ifndef STATX_MNT_ID_UNIQUE
162#define STATX_MNT_ID_UNIQUE 0x00004000U /* Want/got extended stx_mount_id */
163#endif
164
165#ifndef STATMOUNT_MNT_UIDMAP
166#define STATMOUNT_MNT_UIDMAP 0x00002000U /* Want/got uidmap... */
167#endif
168
169#ifndef STATMOUNT_MNT_GIDMAP
170#define STATMOUNT_MNT_GIDMAP 0x00004000U /* Want/got gidmap... */
171#endif
172
173#ifndef MOUNT_ATTR_RDONLY
174#define MOUNT_ATTR_RDONLY 0x00000001 /* Mount read-only */
175#endif
176
177#ifndef MOUNT_ATTR_NOSUID
178#define MOUNT_ATTR_NOSUID 0x00000002 /* Ignore suid and sgid bits */
179#endif
180
181#ifndef MOUNT_ATTR_NODEV
182#define MOUNT_ATTR_NODEV 0x00000004 /* Disallow access to device special files */
183#endif
184
185#ifndef MOUNT_ATTR_NOEXEC
186#define MOUNT_ATTR_NOEXEC 0x00000008 /* Disallow program execution */
187#endif
188
189#ifndef MOUNT_ATTR__ATIME
190#define MOUNT_ATTR__ATIME 0x00000070 /* Setting on how atime should be updated */
191#endif
192
193#ifndef MOUNT_ATTR_RELATIME
194#define MOUNT_ATTR_RELATIME 0x00000000 /* - Update atime relative to mtime/ctime. */
195#endif
196
197#ifndef MOUNT_ATTR_NOATIME
198#define MOUNT_ATTR_NOATIME 0x00000010 /* - Do not update access times. */
199#endif
200
201#ifndef MOUNT_ATTR_STRICTATIME
202#define MOUNT_ATTR_STRICTATIME 0x00000020 /* - Always perform atime updates */
203#endif
204
205#ifndef MOUNT_ATTR_NODIRATIME
206#define MOUNT_ATTR_NODIRATIME 0x00000080 /* Do not update directory access times */
207#endif
208
209#ifndef MOUNT_ATTR_IDMAP
210#define MOUNT_ATTR_IDMAP 0x00100000 /* Idmap mount to @userns_fd in struct mount_attr. */
211#endif
212
213#ifndef MOUNT_ATTR_NOSYMFOLLOW
214#define MOUNT_ATTR_NOSYMFOLLOW 0x00200000 /* Do not follow symlinks */
215#endif
216
217#ifndef MS_RDONLY
218#define MS_RDONLY 1 /* Mount read-only */
219#endif
220
221#ifndef MS_SYNCHRONOUS
222#define MS_SYNCHRONOUS 16 /* Writes are synced at once */
223#endif
224
225#ifndef MS_MANDLOCK
226#define MS_MANDLOCK 64 /* Allow mandatory locks on an FS */
227#endif
228
229#ifndef MS_DIRSYNC
230#define MS_DIRSYNC 128 /* Directory modifications are synchronous */
231#endif
232
233#ifndef MS_UNBINDABLE
234#define MS_UNBINDABLE (1<<17) /* change to unbindable */
235#endif
236
237#ifndef MS_PRIVATE
238#define MS_PRIVATE (1<<18) /* change to private */
239#endif
240
241#ifndef MS_SLAVE
242#define MS_SLAVE (1<<19) /* change to slave */
243#endif
244
245#ifndef MS_SHARED
246#define MS_SHARED (1<<20) /* change to shared */
247#endif
248
249#ifndef MS_LAZYTIME
250#define MS_LAZYTIME (1<<25) /* Update the on-disk [acm]times lazily */
251#endif
252
253#endif /* __SAMPLES_VFS_H */