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1#ifndef _UAPI_LINUX_MOUNT_H2#define _UAPI_LINUX_MOUNT_H3 4#include <linux/types.h>5 6/*7 * These are the fs-independent mount-flags: up to 32 flags are supported8 *9 * Usage of these is restricted within the kernel to core mount(2) code and10 * 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 409625#define MS_MOVE 819226#define MS_REC 1638427#define MS_VERBOSE 32768 /* War is peace. Verbosity is silence.28 MS_VERBOSE is deprecated. */29#define MS_SILENT 3276830#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_REMOUNT51 */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 mask57 */58#define MS_MGC_VAL 0xC0ED000059#define MS_MGC_MSK 0xffff000060 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 0x0000037779 80/*81 * fsopen() flags.82 */83#define FSOPEN_CLOEXEC 0x0000000184 85/*86 * fspick() flags.87 */88#define FSPICK_CLOEXEC 0x0000000189#define FSPICK_SYMLINK_NOFOLLOW 0x0000000290#define FSPICK_NO_AUTOMOUNT 0x0000000491#define FSPICK_EMPTY_PATH 0x0000000892 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 0x00000001112 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 be146 * selected with the @mask argument of statmount(). Kernel will set the @mask147 * field according to the supported fields.148 *149 * If string fields are selected, then the caller needs to pass a buffer that150 * has space after the fixed part of the structure. Nul terminated strings are151 * 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 used153 * size is returned in @size.154 */155struct statmount {156 __u32 size; /* Total size, including strings */157 __u32 mnt_opts; /* [str] Mount options of the mount */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 mnt_ns_id; /* ID of the mount namespace */176 __u64 __spare2[49];177 char str[]; /* Variable size part containing strings */178};179 180/*181 * Structure for passing mount ID and miscellaneous parameters to statmount(2)182 * and listmount(2).183 *184 * For statmount(2) @param represents the request mask.185 * For listmount(2) @param represents the last listed mount id (or zero).186 */187struct mnt_id_req {188 __u32 size;189 __u32 spare;190 __u64 mnt_id;191 __u64 param;192 __u64 mnt_ns_id;193};194 195/* List of all mnt_id_req versions. */196#define MNT_ID_REQ_SIZE_VER0 24 /* sizeof first published struct */197#define MNT_ID_REQ_SIZE_VER1 32 /* sizeof second published struct */198 199/*200 * @mask bits for statmount(2)201 */202#define STATMOUNT_SB_BASIC 0x00000001U /* Want/got sb_... */203#define STATMOUNT_MNT_BASIC 0x00000002U /* Want/got mnt_... */204#define STATMOUNT_PROPAGATE_FROM 0x00000004U /* Want/got propagate_from */205#define STATMOUNT_MNT_ROOT 0x00000008U /* Want/got mnt_root */206#define STATMOUNT_MNT_POINT 0x00000010U /* Want/got mnt_point */207#define STATMOUNT_FS_TYPE 0x00000020U /* Want/got fs_type */208#define STATMOUNT_MNT_NS_ID 0x00000040U /* Want/got mnt_ns_id */209#define STATMOUNT_MNT_OPTS 0x00000080U /* Want/got mnt_opts */210 211/*212 * Special @mnt_id values that can be passed to listmount213 */214#define LSMT_ROOT 0xffffffffffffffff /* root mount */215#define LISTMOUNT_REVERSE (1 << 0) /* List later mounts first */216 217#endif /* _UAPI_LINUX_MOUNT_H */218