218 lines
8.1 KiB
C
218 lines
8.1 KiB
C
#ifndef _UAPI_LINUX_MOUNT_H
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#define _UAPI_LINUX_MOUNT_H
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#include <linux/types.h>
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/*
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* These are the fs-independent mount-flags: up to 32 flags are supported
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*
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* Usage of these is restricted within the kernel to core mount(2) code and
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* callers of sys_mount() only. Filesystems should be using the SB_*
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* equivalent instead.
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*/
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#define MS_RDONLY 1 /* Mount read-only */
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#define MS_NOSUID 2 /* Ignore suid and sgid bits */
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#define MS_NODEV 4 /* Disallow access to device special files */
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#define MS_NOEXEC 8 /* Disallow program execution */
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#define MS_SYNCHRONOUS 16 /* Writes are synced at once */
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#define MS_REMOUNT 32 /* Alter flags of a mounted FS */
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#define MS_MANDLOCK 64 /* Allow mandatory locks on an FS */
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#define MS_DIRSYNC 128 /* Directory modifications are synchronous */
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#define MS_NOSYMFOLLOW 256 /* Do not follow symlinks */
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#define MS_NOATIME 1024 /* Do not update access times. */
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#define MS_NODIRATIME 2048 /* Do not update directory access times */
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#define MS_BIND 4096
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#define MS_MOVE 8192
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#define MS_REC 16384
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#define MS_VERBOSE 32768 /* War is peace. Verbosity is silence.
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MS_VERBOSE is deprecated. */
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#define MS_SILENT 32768
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#define MS_POSIXACL (1<<16) /* VFS does not apply the umask */
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#define MS_UNBINDABLE (1<<17) /* change to unbindable */
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#define MS_PRIVATE (1<<18) /* change to private */
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#define MS_SLAVE (1<<19) /* change to slave */
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#define MS_SHARED (1<<20) /* change to shared */
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#define MS_RELATIME (1<<21) /* Update atime relative to mtime/ctime. */
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#define MS_KERNMOUNT (1<<22) /* this is a kern_mount call */
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#define MS_I_VERSION (1<<23) /* Update inode I_version field */
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#define MS_STRICTATIME (1<<24) /* Always perform atime updates */
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#define MS_LAZYTIME (1<<25) /* Update the on-disk [acm]times lazily */
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/* These sb flags are internal to the kernel */
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#define MS_SUBMOUNT (1<<26)
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#define MS_NOREMOTELOCK (1<<27)
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#define MS_NOSEC (1<<28)
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#define MS_BORN (1<<29)
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#define MS_ACTIVE (1<<30)
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#define MS_NOUSER (1<<31)
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/*
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* Superblock flags that can be altered by MS_REMOUNT
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*/
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#define MS_RMT_MASK (MS_RDONLY|MS_SYNCHRONOUS|MS_MANDLOCK|MS_I_VERSION|\
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MS_LAZYTIME)
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/*
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* Old magic mount flag and mask
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*/
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#define MS_MGC_VAL 0xC0ED0000
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#define MS_MGC_MSK 0xffff0000
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/*
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* open_tree() flags.
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*/
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#define OPEN_TREE_CLONE 1 /* Clone the target tree and attach the clone */
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#define OPEN_TREE_CLOEXEC O_CLOEXEC /* Close the file on execve() */
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/*
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* move_mount() flags.
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*/
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#define MOVE_MOUNT_F_SYMLINKS 0x00000001 /* Follow symlinks on from path */
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#define MOVE_MOUNT_F_AUTOMOUNTS 0x00000002 /* Follow automounts on from path */
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#define MOVE_MOUNT_F_EMPTY_PATH 0x00000004 /* Empty from path permitted */
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#define MOVE_MOUNT_T_SYMLINKS 0x00000010 /* Follow symlinks on to path */
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#define MOVE_MOUNT_T_AUTOMOUNTS 0x00000020 /* Follow automounts on to path */
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#define MOVE_MOUNT_T_EMPTY_PATH 0x00000040 /* Empty to path permitted */
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#define MOVE_MOUNT_SET_GROUP 0x00000100 /* Set sharing group instead */
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#define MOVE_MOUNT_BENEATH 0x00000200 /* Mount beneath top mount */
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#define MOVE_MOUNT__MASK 0x00000377
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/*
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* fsopen() flags.
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*/
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#define FSOPEN_CLOEXEC 0x00000001
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/*
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* fspick() flags.
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*/
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#define FSPICK_CLOEXEC 0x00000001
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#define FSPICK_SYMLINK_NOFOLLOW 0x00000002
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#define FSPICK_NO_AUTOMOUNT 0x00000004
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#define FSPICK_EMPTY_PATH 0x00000008
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/*
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* The type of fsconfig() call made.
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*/
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enum fsconfig_command {
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FSCONFIG_SET_FLAG = 0, /* Set parameter, supplying no value */
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FSCONFIG_SET_STRING = 1, /* Set parameter, supplying a string value */
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FSCONFIG_SET_BINARY = 2, /* Set parameter, supplying a binary blob value */
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FSCONFIG_SET_PATH = 3, /* Set parameter, supplying an object by path */
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FSCONFIG_SET_PATH_EMPTY = 4, /* Set parameter, supplying an object by (empty) path */
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FSCONFIG_SET_FD = 5, /* Set parameter, supplying an object by fd */
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FSCONFIG_CMD_CREATE = 6, /* Create new or reuse existing superblock */
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FSCONFIG_CMD_RECONFIGURE = 7, /* Invoke superblock reconfiguration */
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FSCONFIG_CMD_CREATE_EXCL = 8, /* Create new superblock, fail if reusing existing superblock */
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};
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/*
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* fsmount() flags.
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*/
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#define FSMOUNT_CLOEXEC 0x00000001
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/*
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* Mount attributes.
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*/
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#define MOUNT_ATTR_RDONLY 0x00000001 /* Mount read-only */
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#define MOUNT_ATTR_NOSUID 0x00000002 /* Ignore suid and sgid bits */
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#define MOUNT_ATTR_NODEV 0x00000004 /* Disallow access to device special files */
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#define MOUNT_ATTR_NOEXEC 0x00000008 /* Disallow program execution */
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#define MOUNT_ATTR__ATIME 0x00000070 /* Setting on how atime should be updated */
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#define MOUNT_ATTR_RELATIME 0x00000000 /* - Update atime relative to mtime/ctime. */
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#define MOUNT_ATTR_NOATIME 0x00000010 /* - Do not update access times. */
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#define MOUNT_ATTR_STRICTATIME 0x00000020 /* - Always perform atime updates */
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#define MOUNT_ATTR_NODIRATIME 0x00000080 /* Do not update directory access times */
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#define MOUNT_ATTR_IDMAP 0x00100000 /* Idmap mount to @userns_fd in struct mount_attr. */
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#define MOUNT_ATTR_NOSYMFOLLOW 0x00200000 /* Do not follow symlinks */
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/*
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* mount_setattr()
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*/
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struct mount_attr {
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__u64 attr_set;
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__u64 attr_clr;
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__u64 propagation;
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__u64 userns_fd;
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};
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/* List of all mount_attr versions. */
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#define MOUNT_ATTR_SIZE_VER0 32 /* sizeof first published struct */
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/*
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* Structure for getting mount/superblock/filesystem info with statmount(2).
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*
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* The interface is similar to statx(2): individual fields or groups can be
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* selected with the @mask argument of statmount(). Kernel will set the @mask
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* field according to the supported fields.
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*
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* If string fields are selected, then the caller needs to pass a buffer that
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* has space after the fixed part of the structure. Nul terminated strings are
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* copied there and offsets relative to @str are stored in the relevant fields.
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* If the buffer is too small, then EOVERFLOW is returned. The actually used
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* size is returned in @size.
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*/
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struct statmount {
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__u32 size; /* Total size, including strings */
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__u32 mnt_opts; /* [str] Mount options of the mount */
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__u64 mask; /* What results were written */
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__u32 sb_dev_major; /* Device ID */
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__u32 sb_dev_minor;
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__u64 sb_magic; /* ..._SUPER_MAGIC */
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__u32 sb_flags; /* SB_{RDONLY,SYNCHRONOUS,DIRSYNC,LAZYTIME} */
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__u32 fs_type; /* [str] Filesystem type */
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__u64 mnt_id; /* Unique ID of mount */
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__u64 mnt_parent_id; /* Unique ID of parent (for root == mnt_id) */
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__u32 mnt_id_old; /* Reused IDs used in proc/.../mountinfo */
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__u32 mnt_parent_id_old;
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__u64 mnt_attr; /* MOUNT_ATTR_... */
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__u64 mnt_propagation; /* MS_{SHARED,SLAVE,PRIVATE,UNBINDABLE} */
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__u64 mnt_peer_group; /* ID of shared peer group */
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__u64 mnt_master; /* Mount receives propagation from this ID */
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__u64 propagate_from; /* Propagation from in current namespace */
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__u32 mnt_root; /* [str] Root of mount relative to root of fs */
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__u32 mnt_point; /* [str] Mountpoint relative to current root */
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__u64 mnt_ns_id; /* ID of the mount namespace */
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__u64 __spare2[49];
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char str[]; /* Variable size part containing strings */
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};
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/*
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* Structure for passing mount ID and miscellaneous parameters to statmount(2)
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* and listmount(2).
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*
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* For statmount(2) @param represents the request mask.
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* For listmount(2) @param represents the last listed mount id (or zero).
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*/
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struct mnt_id_req {
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__u32 size;
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__u32 spare;
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__u64 mnt_id;
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__u64 param;
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__u64 mnt_ns_id;
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};
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/* List of all mnt_id_req versions. */
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#define MNT_ID_REQ_SIZE_VER0 24 /* sizeof first published struct */
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#define MNT_ID_REQ_SIZE_VER1 32 /* sizeof second published struct */
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/*
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* @mask bits for statmount(2)
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*/
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#define STATMOUNT_SB_BASIC 0x00000001U /* Want/got sb_... */
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#define STATMOUNT_MNT_BASIC 0x00000002U /* Want/got mnt_... */
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#define STATMOUNT_PROPAGATE_FROM 0x00000004U /* Want/got propagate_from */
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#define STATMOUNT_MNT_ROOT 0x00000008U /* Want/got mnt_root */
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#define STATMOUNT_MNT_POINT 0x00000010U /* Want/got mnt_point */
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#define STATMOUNT_FS_TYPE 0x00000020U /* Want/got fs_type */
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#define STATMOUNT_MNT_NS_ID 0x00000040U /* Want/got mnt_ns_id */
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#define STATMOUNT_MNT_OPTS 0x00000080U /* Want/got mnt_opts */
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/*
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* Special @mnt_id values that can be passed to listmount
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*/
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#define LSMT_ROOT 0xffffffffffffffff /* root mount */
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#define LISTMOUNT_REVERSE (1 << 0) /* List later mounts first */
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#endif /* _UAPI_LINUX_MOUNT_H */
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