1#ifndef _UAPI_LINUX_MOUNT_H 2#define _UAPI_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_BENEATH 0x00000200 /* Mount beneath top mount */ 78#define MOVE_MOUNT__MASK 0x00000377 79 80/* 81 * fsopen() flags. 82 */ 83#define FSOPEN_CLOEXEC 0x00000001 84 85/* 86 * fspick() flags. 87 */ 88#define FSPICK_CLOEXEC 0x00000001 89#define FSPICK_SYMLINK_NOFOLLOW 0x00000002 90#define FSPICK_NO_AUTOMOUNT 0x00000004 91#define FSPICK_EMPTY_PATH 0x00000008 92 93/* 94 * The type of fsconfig() call made. 95 */ 96enum fsconfig_command { 97 FSCONFIG_SET_FLAG = 0, /* Set parameter, supplying no value */ 98 FSCONFIG_SET_STRING = 1, /* Set parameter, supplying a string value */ 99 FSCONFIG_SET_BINARY = 2, /* Set parameter, supplying a binary blob value */ 100 FSCONFIG_SET_PATH = 3, /* Set parameter, supplying an object by path */ 101 FSCONFIG_SET_PATH_EMPTY = 4, /* Set parameter, supplying an object by (empty) path */ 102 FSCONFIG_SET_FD = 5, /* Set parameter, supplying an object by fd */ 103 FSCONFIG_CMD_CREATE = 6, /* Create new or reuse existing superblock */ 104 FSCONFIG_CMD_RECONFIGURE = 7, /* Invoke superblock reconfiguration */ 105 FSCONFIG_CMD_CREATE_EXCL = 8, /* Create new superblock, fail if reusing existing superblock */ 106}; 107 108/* 109 * fsmount() flags. 110 */ 111#define FSMOUNT_CLOEXEC 0x00000001 112 113/* 114 * Mount attributes. 115 */ 116#define MOUNT_ATTR_RDONLY 0x00000001 /* Mount read-only */ 117#define MOUNT_ATTR_NOSUID 0x00000002 /* Ignore suid and sgid bits */ 118#define MOUNT_ATTR_NODEV 0x00000004 /* Disallow access to device special files */ 119#define MOUNT_ATTR_NOEXEC 0x00000008 /* Disallow program execution */ 120#define MOUNT_ATTR__ATIME 0x00000070 /* Setting on how atime should be updated */ 121#define MOUNT_ATTR_RELATIME 0x00000000 /* - Update atime relative to mtime/ctime. */ 122#define MOUNT_ATTR_NOATIME 0x00000010 /* - Do not update access times. */ 123#define MOUNT_ATTR_STRICTATIME 0x00000020 /* - Always perform atime updates */ 124#define MOUNT_ATTR_NODIRATIME 0x00000080 /* Do not update directory access times */ 125#define MOUNT_ATTR_IDMAP 0x00100000 /* Idmap mount to @userns_fd in struct mount_attr. */ 126#define MOUNT_ATTR_NOSYMFOLLOW 0x00200000 /* Do not follow symlinks */ 127 128/* 129 * mount_setattr() 130 */ 131struct mount_attr { 132 __u64 attr_set; 133 __u64 attr_clr; 134 __u64 propagation; 135 __u64 userns_fd; 136}; 137 138/* List of all mount_attr versions. */ 139#define MOUNT_ATTR_SIZE_VER0 32 /* sizeof first published struct */ 140 141 142/* 143 * Structure for getting mount/superblock/filesystem info with statmount(2). 144 * 145 * The interface is similar to statx(2): individual fields or groups can be 146 * selected with the @mask argument of statmount(). Kernel will set the @mask 147 * field according to the supported fields. 148 * 149 * If string fields are selected, then the caller needs to pass a buffer that 150 * has space after the fixed part of the structure. Nul terminated strings are 151 * copied there and offsets relative to @str are stored in the relevant fields. 152 * If the buffer is too small, then EOVERFLOW is returned. The actually used 153 * size is returned in @size. 154 */ 155struct statmount { 156 __u32 size; /* Total size, including strings */ 157 __u32 __spare1; 158 __u64 mask; /* What results were written */ 159 __u32 sb_dev_major; /* Device ID */ 160 __u32 sb_dev_minor; 161 __u64 sb_magic; /* ..._SUPER_MAGIC */ 162 __u32 sb_flags; /* SB_{RDONLY,SYNCHRONOUS,DIRSYNC,LAZYTIME} */ 163 __u32 fs_type; /* [str] Filesystem type */ 164 __u64 mnt_id; /* Unique ID of mount */ 165 __u64 mnt_parent_id; /* Unique ID of parent (for root == mnt_id) */ 166 __u32 mnt_id_old; /* Reused IDs used in proc/.../mountinfo */ 167 __u32 mnt_parent_id_old; 168 __u64 mnt_attr; /* MOUNT_ATTR_... */ 169 __u64 mnt_propagation; /* MS_{SHARED,SLAVE,PRIVATE,UNBINDABLE} */ 170 __u64 mnt_peer_group; /* ID of shared peer group */ 171 __u64 mnt_master; /* Mount receives propagation from this ID */ 172 __u64 propagate_from; /* Propagation from in current namespace */ 173 __u32 mnt_root; /* [str] Root of mount relative to root of fs */ 174 __u32 mnt_point; /* [str] Mountpoint relative to current root */ 175 __u64 __spare2[50]; 176 char str[]; /* Variable size part containing strings */ 177}; 178 179/* 180 * Structure for passing mount ID and miscellaneous parameters to statmount(2) 181 * and listmount(2). 182 * 183 * For statmount(2) @param represents the request mask. 184 * For listmount(2) @param represents the last listed mount id (or zero). 185 */ 186struct mnt_id_req { 187 __u32 size; 188 __u32 spare; 189 __u64 mnt_id; 190 __u64 param; 191}; 192 193/* List of all mnt_id_req versions. */ 194#define MNT_ID_REQ_SIZE_VER0 24 /* sizeof first published struct */ 195 196/* 197 * @mask bits for statmount(2) 198 */ 199#define STATMOUNT_SB_BASIC 0x00000001U /* Want/got sb_... */ 200#define STATMOUNT_MNT_BASIC 0x00000002U /* Want/got mnt_... */ 201#define STATMOUNT_PROPAGATE_FROM 0x00000004U /* Want/got propagate_from */ 202#define STATMOUNT_MNT_ROOT 0x00000008U /* Want/got mnt_root */ 203#define STATMOUNT_MNT_POINT 0x00000010U /* Want/got mnt_point */ 204#define STATMOUNT_FS_TYPE 0x00000020U /* Want/got fs_type */ 205 206/* 207 * Special @mnt_id values that can be passed to listmount 208 */ 209#define LSMT_ROOT 0xffffffffffffffff /* root mount */ 210 211#endif /* _UAPI_LINUX_MOUNT_H */ 212