/* * 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
/* * 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 */
};
/* 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] Options (comma separated, escaped) */
__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 */
__u32 fs_subtype; /* [str] Subtype of fs_type (if any) */
__u32 sb_source; /* [str] Source string of the mount */
__u32 opt_num; /* Number of fs options */
__u32 opt_array; /* [str] Array of nul terminated fs options */
__u32 opt_sec_num; /* Number of security options */
__u32 opt_sec_array; /* [str] Array of nul terminated security options */
__u64 supported_mask; /* Mask flags that this kernel supports */
__u32 mnt_uidmap_num; /* Number of uid mappings */
__u32 mnt_uidmap; /* [str] Array of uid mappings (as seen from callers namespace) */
__u32 mnt_gidmap_num; /* Number of gid mappings */
__u32 mnt_gidmap; /* [str] Array of gid mappings (as seen from callers namespace) */
__u64 __spare2[43]; 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 mnt_ns_fd;
__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 */
/* * 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 */
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