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 18 struct 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 __u64 __spare2[46]; 46 char str[]; /* Variable size part containing strings */ 47 }; 48 49 struct mnt_id_req { 50 __u32 size; 51 __u32 spare; 52 __u64 mnt_id; 53 __u64 param; 54 __u64 mnt_ns_id; 55 }; 56 57 #ifndef MNT_ID_REQ_SIZE_VER0 58 #define MNT_ID_REQ_SIZE_VER0 24 /* sizeof first published struct */ 59 #endif 60 61 #ifndef MNT_ID_REQ_SIZE_VER1 62 #define MNT_ID_REQ_SIZE_VER1 32 /* sizeof second published struct */ 63 #endif 64 65 /* Get the id for a mount namespace */ 66 #ifndef NS_GET_MNTNS_ID 67 #define NS_GET_MNTNS_ID _IO(0xb7, 0x5) 68 #endif 69 70 struct mnt_ns_info { 71 __u32 size; 72 __u32 nr_mounts; 73 __u64 mnt_ns_id; 74 }; 75 76 #ifndef MNT_NS_INFO_SIZE_VER0 77 #define MNT_NS_INFO_SIZE_VER0 16 /* size of first published struct */ 78 #endif 79 80 #ifndef NS_MNT_GET_INFO 81 #define NS_MNT_GET_INFO _IOR(0xb7, 10, struct mnt_ns_info) 82 #endif 83 84 #ifndef NS_MNT_GET_NEXT 85 #define NS_MNT_GET_NEXT _IOR(0xb7, 11, struct mnt_ns_info) 86 #endif 87 88 #ifndef NS_MNT_GET_PREV 89 #define NS_MNT_GET_PREV _IOR(0xb7, 12, struct mnt_ns_info) 90 #endif 91 92 #ifndef PIDFD_GET_MNT_NAMESPACE 93 #define PIDFD_GET_MNT_NAMESPACE _IO(0xFF, 3) 94 #endif 95 96 #ifndef __NR_listmount 97 #define __NR_listmount 458 98 #endif 99 100 #ifndef __NR_statmount 101 #define __NR_statmount 457 102 #endif 103 104 #ifndef LSMT_ROOT 105 #define LSMT_ROOT 0xffffffffffffffff /* root mount */ 106 #endif 107 108 /* @mask bits for statmount(2) */ 109 #ifndef STATMOUNT_SB_BASIC 110 #define STATMOUNT_SB_BASIC 0x00000001U /* Want/got sb_... */ 111 #endif 112 113 #ifndef STATMOUNT_MNT_BASIC 114 #define STATMOUNT_MNT_BASIC 0x00000002U /* Want/got mnt_... */ 115 #endif 116 117 #ifndef STATMOUNT_PROPAGATE_FROM 118 #define STATMOUNT_PROPAGATE_FROM 0x00000004U /* Want/got propagate_from */ 119 #endif 120 121 #ifndef STATMOUNT_MNT_ROOT 122 #define STATMOUNT_MNT_ROOT 0x00000008U /* Want/got mnt_root */ 123 #endif 124 125 #ifndef STATMOUNT_MNT_POINT 126 #define STATMOUNT_MNT_POINT 0x00000010U /* Want/got mnt_point */ 127 #endif 128 129 #ifndef STATMOUNT_FS_TYPE 130 #define STATMOUNT_FS_TYPE 0x00000020U /* Want/got fs_type */ 131 #endif 132 133 #ifndef STATMOUNT_MNT_NS_ID 134 #define STATMOUNT_MNT_NS_ID 0x00000040U /* Want/got mnt_ns_id */ 135 #endif 136 137 #ifndef STATMOUNT_MNT_OPTS 138 #define STATMOUNT_MNT_OPTS 0x00000080U /* Want/got mnt_opts */ 139 #endif 140 141 #ifndef STATMOUNT_FS_SUBTYPE 142 #define STATMOUNT_FS_SUBTYPE 0x00000100U /* Want/got fs_subtype */ 143 #endif 144 145 #ifndef STATMOUNT_SB_SOURCE 146 #define STATMOUNT_SB_SOURCE 0x00000200U /* Want/got sb_source */ 147 #endif 148 149 #ifndef STATMOUNT_OPT_ARRAY 150 #define STATMOUNT_OPT_ARRAY 0x00000400U /* Want/got opt_... */ 151 #endif 152 153 #ifndef STATMOUNT_OPT_SEC_ARRAY 154 #define STATMOUNT_OPT_SEC_ARRAY 0x00000800U /* Want/got opt_sec... */ 155 #endif 156 157 #ifndef STATX_MNT_ID_UNIQUE 158 #define STATX_MNT_ID_UNIQUE 0x00004000U /* Want/got extended stx_mount_id */ 159 #endif 160 161 #ifndef MOUNT_ATTR_RDONLY 162 #define MOUNT_ATTR_RDONLY 0x00000001 /* Mount read-only */ 163 #endif 164 165 #ifndef MOUNT_ATTR_NOSUID 166 #define MOUNT_ATTR_NOSUID 0x00000002 /* Ignore suid and sgid bits */ 167 #endif 168 169 #ifndef MOUNT_ATTR_NODEV 170 #define MOUNT_ATTR_NODEV 0x00000004 /* Disallow access to device special files */ 171 #endif 172 173 #ifndef MOUNT_ATTR_NOEXEC 174 #define MOUNT_ATTR_NOEXEC 0x00000008 /* Disallow program execution */ 175 #endif 176 177 #ifndef MOUNT_ATTR__ATIME 178 #define MOUNT_ATTR__ATIME 0x00000070 /* Setting on how atime should be updated */ 179 #endif 180 181 #ifndef MOUNT_ATTR_RELATIME 182 #define MOUNT_ATTR_RELATIME 0x00000000 /* - Update atime relative to mtime/ctime. */ 183 #endif 184 185 #ifndef MOUNT_ATTR_NOATIME 186 #define MOUNT_ATTR_NOATIME 0x00000010 /* - Do not update access times. */ 187 #endif 188 189 #ifndef MOUNT_ATTR_STRICTATIME 190 #define MOUNT_ATTR_STRICTATIME 0x00000020 /* - Always perform atime updates */ 191 #endif 192 193 #ifndef MOUNT_ATTR_NODIRATIME 194 #define MOUNT_ATTR_NODIRATIME 0x00000080 /* Do not update directory access times */ 195 #endif 196 197 #ifndef MOUNT_ATTR_IDMAP 198 #define MOUNT_ATTR_IDMAP 0x00100000 /* Idmap mount to @userns_fd in struct mount_attr. */ 199 #endif 200 201 #ifndef MOUNT_ATTR_NOSYMFOLLOW 202 #define MOUNT_ATTR_NOSYMFOLLOW 0x00200000 /* Do not follow symlinks */ 203 #endif 204 205 #ifndef MS_RDONLY 206 #define MS_RDONLY 1 /* Mount read-only */ 207 #endif 208 209 #ifndef MS_SYNCHRONOUS 210 #define MS_SYNCHRONOUS 16 /* Writes are synced at once */ 211 #endif 212 213 #ifndef MS_MANDLOCK 214 #define MS_MANDLOCK 64 /* Allow mandatory locks on an FS */ 215 #endif 216 217 #ifndef MS_DIRSYNC 218 #define MS_DIRSYNC 128 /* Directory modifications are synchronous */ 219 #endif 220 221 #ifndef MS_UNBINDABLE 222 #define MS_UNBINDABLE (1<<17) /* change to unbindable */ 223 #endif 224 225 #ifndef MS_PRIVATE 226 #define MS_PRIVATE (1<<18) /* change to private */ 227 #endif 228 229 #ifndef MS_SLAVE 230 #define MS_SLAVE (1<<19) /* change to slave */ 231 #endif 232 233 #ifndef MS_SHARED 234 #define MS_SHARED (1<<20) /* change to shared */ 235 #endif 236 237 #ifndef MS_LAZYTIME 238 #define MS_LAZYTIME (1<<25) /* Update the on-disk [acm]times lazily */ 239 #endif 240 241 #endif /* __SAMPLES_VFS_H */ 242