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mount.h
/* Header file for mounting/unmount Linux filesystems. Copyright (C) 1996-2024 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. The GNU C Library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with the GNU C Library; if not, see <https://www.gnu.org/licenses/>. */ /* This is taken from /usr/include/linux/fs.h. */ #ifndef _SYS_MOUNT_H #define _SYS_MOUNT_H 1 #include <fcntl.h> #include <features.h> #include <stdint.h> #include <stddef.h> #include <sys/ioctl.h> #ifdef __has_include # if __has_include ("linux/mount.h") # include "linux/mount.h" # endif #endif #define BLOCK_SIZE_BITS 10 #define BLOCK_SIZE (1<<BLOCK_SIZE_BITS) /* These are the fs-independent mount-flags: up to 16 flags are supported */ enum { #undef MS_RDONLY MS_RDONLY = 1, /* Mount read-only. */ #define MS_RDONLY MS_RDONLY #undef MS_NOSUID MS_NOSUID = 2, /* Ignore suid and sgid bits. */ #define MS_NOSUID MS_NOSUID #undef MS_NODEV MS_NODEV = 4, /* Disallow access to device special files. */ #define MS_NODEV MS_NODEV #undef MS_NOEXEC MS_NOEXEC = 8, /* Disallow program execution. */ #define MS_NOEXEC MS_NOEXEC #undef MS_SYNCHRONOUS MS_SYNCHRONOUS = 16, /* Writes are synced at once. */ #define MS_SYNCHRONOUS MS_SYNCHRONOUS #undef MS_REMOUNT MS_REMOUNT = 32, /* Alter flags of a mounted FS. */ #define MS_REMOUNT MS_REMOUNT #undef MS_MANDLOCK MS_MANDLOCK = 64, /* Allow mandatory locks on an FS. */ #define MS_MANDLOCK MS_MANDLOCK #undef MS_DIRSYNC MS_DIRSYNC = 128, /* Directory modifications are synchronous. */ #define MS_DIRSYNC MS_DIRSYNC #undef MS_NOSYMFOLLOW MS_NOSYMFOLLOW = 256, /* Do not follow symlinks. */ #define MS_NOSYMFOLLOW MS_NOSYMFOLLOW #undef MS_NOATIME MS_NOATIME = 1024, /* Do not update access times. */ #define MS_NOATIME MS_NOATIME #undef MS_NODIRATIME MS_NODIRATIME = 2048, /* Do not update directory access times. */ #define MS_NODIRATIME MS_NODIRATIME #undef MS_BIND MS_BIND = 4096, /* Bind directory at different place. */ #define MS_BIND MS_BIND #undef MS_MOVE MS_MOVE = 8192, #define MS_MOVE MS_MOVE #undef MS_REC MS_REC = 16384, #define MS_REC MS_REC #undef MS_SILENT MS_SILENT = 32768, #define MS_SILENT MS_SILENT #undef MS_POSIXACL MS_POSIXACL = 1 << 16, /* VFS does not apply the umask. */ #define MS_POSIXACL MS_POSIXACL #undef MS_UNBINDABLE MS_UNBINDABLE = 1 << 17, /* Change to unbindable. */ #define MS_UNBINDABLE MS_UNBINDABLE #undef MS_PRIVATE MS_PRIVATE = 1 << 18, /* Change to private. */ #define MS_PRIVATE MS_PRIVATE #undef MS_SLAVE MS_SLAVE = 1 << 19, /* Change to slave. */ #define MS_SLAVE MS_SLAVE #undef MS_SHARED MS_SHARED = 1 << 20, /* Change to shared. */ #define MS_SHARED MS_SHARED #undef MS_RELATIME MS_RELATIME = 1 << 21, /* Update atime relative to mtime/ctime. */ #define MS_RELATIME MS_RELATIME #undef MS_KERNMOUNT MS_KERNMOUNT = 1 << 22, /* This is a kern_mount call. */ #define MS_KERNMOUNT MS_KERNMOUNT #undef MS_I_VERSION MS_I_VERSION = 1 << 23, /* Update inode I_version field. */ #define MS_I_VERSION MS_I_VERSION #undef MS_STRICTATIME MS_STRICTATIME = 1 << 24, /* Always perform atime updates. */ #define MS_STRICTATIME MS_STRICTATIME #undef MS_LAZYTIME MS_LAZYTIME = 1 << 25, /* Update the on-disk [acm]times lazily. */ #define MS_LAZYTIME MS_LAZYTIME #undef MS_ACTIVE MS_ACTIVE = 1 << 30, #define MS_ACTIVE MS_ACTIVE #undef MS_NOUSER MS_NOUSER = 1 << 31 #define MS_NOUSER MS_NOUSER }; /* Flags that can be altered by MS_REMOUNT */ #undef MS_RMT_MASK #define MS_RMT_MASK (MS_RDONLY|MS_SYNCHRONOUS|MS_MANDLOCK|MS_I_VERSION \ |MS_LAZYTIME) /* Magic mount flag number. Has to be or-ed to the flag values. */ #undef MS_MGC_VAL #define MS_MGC_VAL 0xc0ed0000 /* Magic flag number to indicate "new" flags */ #define MS_MGC_MSK 0xffff0000 /* Magic flag number mask */ /* The read-only stuff doesn't really belong here, but any other place is probably as bad and I don't want to create yet another include file. */ #undef BLKROSET #define BLKROSET _IO(0x12, 93) /* Set device read-only (0 = read-write). */ #undef BLKROGET #define BLKROGET _IO(0x12, 94) /* Get read-only status (0 = read_write). */ #undef BLKRRPART #define BLKRRPART _IO(0x12, 95) /* Re-read partition table. */ #undef BLKGETSIZE #define BLKGETSIZE _IO(0x12, 96) /* Return device size. */ #undef BLKFLSBUF #define BLKFLSBUF _IO(0x12, 97) /* Flush buffer cache. */ #undef BLKRASET #define BLKRASET _IO(0x12, 98) /* Set read ahead for block device. */ #undef BLKRAGET #define BLKRAGET _IO(0x12, 99) /* Get current read ahead setting. */ #undef BLKFRASET #define BLKFRASET _IO(0x12,100) /* Set filesystem read-ahead. */ #undef BLKFRAGET #define BLKFRAGET _IO(0x12,101) /* Get filesystem read-ahead. */ #undef BLKSECTSET #define BLKSECTSET _IO(0x12,102) /* Set max sectors per request. */ #undef BLKSECTGET #define BLKSECTGET _IO(0x12,103) /* Get max sectors per request. */ #undef BLKSSZGET #define BLKSSZGET _IO(0x12,104) /* Get block device sector size. */ #undef BLKBSZGET #define BLKBSZGET _IOR(0x12,112,size_t) #undef BLKBSZSET #define BLKBSZSET _IOW(0x12,113,size_t) #undef BLKGETSIZE64 #define BLKGETSIZE64 _IOR(0x12,114,size_t) /* return device size. */ /* Possible value for FLAGS parameter of `umount2'. */ enum { MNT_FORCE = 1, /* Force unmounting. */ #define MNT_FORCE MNT_FORCE MNT_DETACH = 2, /* Just detach from the tree. */ #define MNT_DETACH MNT_DETACH MNT_EXPIRE = 4, /* Mark for expiry. */ #define MNT_EXPIRE MNT_EXPIRE UMOUNT_NOFOLLOW = 8 /* Don't follow symlink on umount. */ #define UMOUNT_NOFOLLOW UMOUNT_NOFOLLOW }; /* fsmount flags. */ #define FSMOUNT_CLOEXEC 0x00000001 /* mount attributes used on fsmount. */ #define MOUNT_ATTR_RDONLY 0x00000001 /* Mount read-only. */ #define MOUNT_ATTR_NOSUID 0x00000002 /* Ignore suid and sgid bits. */ #define MOUNT_ATTR_NODEV 0x00000004 /* Disallow access to device special files. */ #define MOUNT_ATTR_NOEXEC 0x00000008 /* Disallow program execution. */ #define MOUNT_ATTR__ATIME 0x00000070 /* Setting on how atime should be updated. */ #define MOUNT_ATTR_RELATIME 0x00000000 /* - Update atime relative to mtime/ctime. */ #define MOUNT_ATTR_NOATIME 0x00000010 /* - Do not update access times. */ #define MOUNT_ATTR_STRICTATIME 0x00000020 /* - Always perform atime updates */ #define MOUNT_ATTR_NODIRATIME 0x00000080 /* Do not update directory access times. */ #define MOUNT_ATTR_IDMAP 0x00100000 /* Idmap mount to @userns_fd in struct mount_attr. */ #define MOUNT_ATTR_NOSYMFOLLOW 0x00200000 /* Do not follow symlinks. */ #ifndef MOUNT_ATTR_SIZE_VER0 /* For mount_setattr. */ struct mount_attr { uint64_t attr_set; uint64_t attr_clr; uint64_t propagation; uint64_t userns_fd; }; #endif #define MOUNT_ATTR_SIZE_VER0 32 /* sizeof first published struct */ /* 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 */ /* fspick flags. */ #define FSPICK_CLOEXEC 0x00000001 #define FSPICK_SYMLINK_NOFOLLOW 0x00000002 #define FSPICK_NO_AUTOMOUNT 0x00000004 #define FSPICK_EMPTY_PATH 0x00000008 #ifndef FSOPEN_CLOEXEC /* The type of fsconfig call made. */ enum fsconfig_command { FSCONFIG_SET_FLAG = 0, /* Set parameter, supplying no value */ # define FSCONFIG_SET_FLAG FSCONFIG_SET_FLAG FSCONFIG_SET_STRING = 1, /* Set parameter, supplying a string value */ # define FSCONFIG_SET_STRING FSCONFIG_SET_STRING FSCONFIG_SET_BINARY = 2, /* Set parameter, supplying a binary blob value */ # define FSCONFIG_SET_BINARY FSCONFIG_SET_BINARY FSCONFIG_SET_PATH = 3, /* Set parameter, supplying an object by path */ # define FSCONFIG_SET_PATH FSCONFIG_SET_PATH FSCONFIG_SET_PATH_EMPTY = 4, /* Set parameter, supplying an object by (empty) path */ # define FSCONFIG_SET_PATH_EMPTY FSCONFIG_SET_PATH_EMPTY FSCONFIG_SET_FD = 5, /* Set parameter, supplying an object by fd */ # define FSCONFIG_SET_FD FSCONFIG_SET_FD FSCONFIG_CMD_CREATE = 6, /* Invoke superblock creation */ # define FSCONFIG_CMD_CREATE FSCONFIG_CMD_CREATE FSCONFIG_CMD_RECONFIGURE = 7, /* Invoke superblock reconfiguration */ # define FSCONFIG_CMD_RECONFIGURE FSCONFIG_CMD_RECONFIGURE FSCONFIG_CMD_CREATE_EXCL = 8, /* Create new superblock, fail if reusing existing superblock */ # define FSCONFIG_CMD_CREATE_EXCL FSCONFIG_CMD_CREATE_EXCL }; #endif /* fsopen flags. */ #define FSOPEN_CLOEXEC 0x00000001 /* 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() */ __BEGIN_DECLS /* Mount a filesystem. */ extern int mount (const char *__special_file, const char *__dir, const char *__fstype, unsigned long int __rwflag, const void *__data) __THROW; /* Unmount a filesystem. */ extern int umount (const char *__special_file) __THROW; /* Unmount a filesystem. Force unmounting if FLAGS is set to MNT_FORCE. */ extern int umount2 (const char *__special_file, int __flags) __THROW; /* Open the filesystem referenced by FS_NAME so it can be configured for mouting. */ extern int fsopen (const char *__fs_name, unsigned int __flags) __THROW; /* Create a mount representation for the FD created by fsopen using FLAGS with ATTR_FLAGS describing how the mount is to be performed. */ extern int fsmount (int __fd, unsigned int __flags, unsigned int __ms_flags) __THROW; /* Add the mounted FROM_DFD referenced by FROM_PATHNAME filesystem returned by fsmount in the hierarchy in the place TO_DFD reference by TO_PATHNAME using FLAGS. */ extern int move_mount (int __from_dfd, const char *__from_pathname, int __to_dfd, const char *__to_pathname, unsigned int flags) __THROW; /* Set parameters and trigger CMD action on the FD context. KEY, VALUE, and AUX are used depending ng of the CMD. */ extern int fsconfig (int __fd, unsigned int __cmd, const char *__key, const void *__value, int __aux) __THROW; /* Equivalent of fopen for an existing mount point. */ extern int fspick (int __dfd, const char *__path, unsigned int __flags) __THROW; /* Open the mount point FILENAME in directory DFD using FLAGS. */ extern int open_tree (int __dfd, const char *__filename, unsigned int __flags) __THROW; /* Change the mount properties of the mount or an entire mount tree. If PATH is a relative pathname, then it is interpreted relative to the directory referred to by the file descriptor dirfd. Otherwise if DFD is the special value AT_FDCWD then PATH is interpreted relative to the current working directory of the calling process. */ extern int mount_setattr (int __dfd, const char *__path, unsigned int __flags, struct mount_attr *__uattr, size_t __usize) __THROW; __END_DECLS #endif /* _SYS_MOUNT_H */