include/mount-api-utils.h

   1 /*
   2  * No copyright is claimed.  This code is in the public domain; do with
   3  * it what you wish.
   4  */
   5 #ifndef UTIL_LINUX_MOUNT_API_UTILS
   6 #define UTIL_LINUX_MOUNT_API_UTILS
   7
   8 #ifdef HAVE_MOUNTFD_API
   9
  10 #include <sys/syscall.h>
  11 #include <linux/mount.h>
  12
  13 /* Accepted by both open_tree() and mount_setattr(). */
  14 #ifndef AT_RECURSIVE
  15 # define AT_RECURSIVE 0x8000
  16 #endif
  17
  18 #ifndef OPEN_TREE_CLONE
  19 # define OPEN_TREE_CLONE 1
  20 #endif
  21
  22 #ifndef OPEN_TREE_CLOEXEC
  23 # define OPEN_TREE_CLOEXEC O_CLOEXEC
  24 #endif
  25
  26 #if !defined(HAVE_OPEN_TREE) && defined(SYS_open_tree)
  27 static inline int open_tree(int dfd, const char *filename, unsigned int flags)
  28 {
  29         return syscall(SYS_open_tree, dfd, filename, flags);
  30 }
  31 #endif
  32
  33 #ifndef MOVE_MOUNT_F_SYMLINKS
  34 # define MOVE_MOUNT_F_SYMLINKS 0x00000001 /* Follow symlinks on from path */
  35 #endif
  36
  37 #ifndef MOVE_MOUNT_F_AUTOMOUNTS
  38 # define MOVE_MOUNT_F_AUTOMOUNTS 0x00000002 /* Follow automounts on from path */
  39 #endif
  40
  41 #ifndef MOVE_MOUNT_F_EMPTY_PATH
  42 # define MOVE_MOUNT_F_EMPTY_PATH 0x00000004 /* Empty from path permitted */
  43 #endif
  44
  45 #ifndef MOVE_MOUNT_T_SYMLINKS
  46 # define MOVE_MOUNT_T_SYMLINKS 0x00000010 /* Follow symlinks on to path */
  47 #endif
  48
  49 #ifndef MOVE_MOUNT_T_AUTOMOUNTS
  50 # define MOVE_MOUNT_T_AUTOMOUNTS 0x00000020 /* Follow automounts on to path */
  51 #endif
  52
  53 #ifndef MOVE_MOUNT_T_EMPTY_PATH
  54 # define MOVE_MOUNT_T_EMPTY_PATH 0x00000040 /* Empty to path permitted */
  55 #endif
  56
  57 #ifndef MOVE_MOUNT_SET_GROUP
  58 # define MOVE_MOUNT_SET_GROUP   0x00000100 /* Set sharing group instead */
  59 #endif
  60
  61 #ifndef MOVE_MOUNT__MASK
  62 # define MOVE_MOUNT__MASK 0x00000077
  63 #endif
  64
  65 #if !defined(HAVE_MOVE_MOUNT) && defined(SYS_move_mount)
  66 static inline int move_mount(int from_dfd, const char *from_pathname, int to_dfd,
  67                              const char *to_pathname, unsigned int flags)
  68 {
  69         return syscall(SYS_move_mount, from_dfd, from_pathname, to_dfd,
  70                        to_pathname, flags);
  71 }
  72 #endif
  73
  74 #ifndef MOUNT_ATTR_RDONLY
  75 # define MOUNT_ATTR_RDONLY 0x00000001
  76 #endif
  77
  78 #ifndef MOUNT_ATTR_NOSUID
  79 # define MOUNT_ATTR_NOSUID 0x00000002
  80 #endif
  81
  82 #ifndef MOUNT_ATTR_NODEV
  83 # define MOUNT_ATTR_NODEV 0x00000004
  84 #endif
  85
  86 #ifndef MOUNT_ATTR_NOEXEC
  87 # define MOUNT_ATTR_NOEXEC 0x00000008
  88 #endif
  89
  90 #ifndef MOUNT_ATTR__ATIME
  91 # define MOUNT_ATTR__ATIME 0x00000070
  92 #endif
  93
  94 #ifndef MOUNT_ATTR_RELATIME
  95 # define MOUNT_ATTR_RELATIME 0x00000000
  96 #endif
  97
  98 #ifndef MOUNT_ATTR_NOATIME
  99 # define MOUNT_ATTR_NOATIME 0x00000010
 100 #endif
 101
 102 #ifndef MOUNT_ATTR_STRICTATIME
 103 # define MOUNT_ATTR_STRICTATIME 0x00000020
 104 #endif
 105
 106 #ifndef MOUNT_ATTR_NODIRATIME
 107 # define MOUNT_ATTR_NODIRATIME 0x00000080
 108 #endif
 109
 110 #ifndef MOUNT_ATTR_IDMAP
 111 # define MOUNT_ATTR_IDMAP 0x00100000
 112 #endif
 113
 114 #ifndef MOUNT_ATTR_NOSYMFOLLOW
 115 # define MOUNT_ATTR_NOSYMFOLLOW 0x00200000
 116 #endif
 117
 118 #ifndef HAVE_STRUCT_MOUNT_ATTR
 119 # ifndef MOUNT_ATTR_SIZE_VER0 /* For case mount.h comes from a place invisible for autotools/meson */
 120 # include <inttypes.h>
 121 struct mount_attr {
 122         uint64_t attr_set;
 123         uint64_t attr_clr;
 124         uint64_t propagation;
 125         uint64_t userns_fd;
 126 };
 127 # endif
 128 #endif
 129
 130 #if !defined(HAVE_MOUNT_SETATTR) && defined(SYS_mount_setattr)
 131 static inline int mount_setattr(int dfd, const char *path, unsigned int flags,
 132                                 struct mount_attr *attr, size_t size)
 133 {
 134         return syscall(SYS_mount_setattr, dfd, path, flags, attr, size);
 135 }
 136 #endif
 137
 138 #ifndef HAVE_ENUM_FSCONFIG_COMMAND
 139 # ifndef FSOPEN_CLOEXEC /* For case mount.h comes from a place invisible for autotools/meson */
 140 enum fsconfig_command {
 141         FSCONFIG_SET_FLAG       = 0,    /* Set parameter, supplying no value */
 142         FSCONFIG_SET_STRING     = 1,    /* Set parameter, supplying a string value */
 143         FSCONFIG_SET_BINARY     = 2,    /* Set parameter, supplying a binary blob value */
 144         FSCONFIG_SET_PATH       = 3,    /* Set parameter, supplying an object by path */
 145         FSCONFIG_SET_PATH_EMPTY = 4,    /* Set parameter, supplying an object by (empty) path */
 146         FSCONFIG_SET_FD         = 5,    /* Set parameter, supplying an object by fd */
 147         FSCONFIG_CMD_CREATE     = 6,    /* Invoke superblock creation */
 148         FSCONFIG_CMD_RECONFIGURE = 7,   /* Invoke superblock reconfiguration */
 149 };
 150 # endif
 151 #endif
 152
 153 #if !defined(HAVE_FSCONFIG) && defined(SYS_fsconfig)
 154 static inline int fsconfig(int fd, unsigned int cmd, const char *key,
 155                     const void *value, int aux)
 156 {
 157         return syscall(SYS_fsconfig, fd, cmd, key, value, aux);
 158 }
 159 #endif
 160
 161 #ifndef FSOPEN_CLOEXEC
 162 # define FSOPEN_CLOEXEC          0x00000001
 163 #endif
 164
 165 #if !defined(HAVE_FSOPEN) && defined(SYS_fsopen)
 166 static inline int fsopen(const char *fsname, unsigned int flags)
 167 {
 168         return syscall(SYS_fsopen, fsname, flags);
 169 }
 170 #endif
 171
 172 #ifndef FSMOUNT_CLOEXEC
 173 # define FSMOUNT_CLOEXEC         0x00000001
 174 #endif
 175
 176 #if !defined(HAVE_FSMOUNT) && defined(SYS_fsmount)
 177 static inline int fsmount(int fd, unsigned int flags, unsigned int mount_attrs)
 178 {
 179         return syscall(SYS_fsmount, fd, flags, mount_attrs);
 180 }
 181 #endif
 182
 183 #ifndef FSPICK_CLOEXEC
 184 # define FSPICK_CLOEXEC          0x00000001
 185 #endif
 186
 187 #ifndef FSPICK_SYMLINK_NOFOLLOW
 188 # define FSPICK_SYMLINK_NOFOLLOW 0x00000002
 189 #endif
 190
 191 #ifndef FSPICK_NO_AUTOMOUNT
 192 # define FSPICK_NO_AUTOMOUNT     0x00000004
 193 #endif
 194
 195 #ifdef FSPICK_EMPTY_PATH
 196 # define FSPICK_EMPTY_PATH       0x00000008
 197 #endif
 198
 199 #if !defined(HAVE_FSPICK) && defined(SYS_fspick)
 200 static inline int fspick(int dfd, const char *pathname, unsigned int flags)
 201 {
 202         return syscall(SYS_fspick, dfd, pathname, flags);
 203 }
 204 #endif
 205
 206 #endif /* HAVE_MOUNTFD_API */
 207 #endif /* UTIL_LINUX_MOUNT_API_UTILS */
 208