diff --git a/src/pxar/encoder.rs b/src/pxar/encoder.rs
index 400ab38a..15ff761b 100644
--- a/src/pxar/encoder.rs
+++ b/src/pxar/encoder.rs
@@ -224,8 +224,11 @@ impl <'a, W: Write> Encoder<'a, W> {
     }
 
     fn read_fat_attr(&self, fd: RawFd, magic: i64, entry: &mut CaFormatEntry) -> Result<(), Error> {
+        use fs::magic::*;
 
-        if magic != MSDOS_SUPER_MAGIC && magic != FUSE_SUPER_MAGIC { return Ok(()); }
+        if magic != MSDOS_SUPER_MAGIC && magic != FUSE_SUPER_MAGIC {
+            return Ok(());
+        }
 
         let mut attr: u32 = 0;
 
@@ -429,7 +432,10 @@ impl <'a, W: Write> Encoder<'a, W> {
         }
 
         match magic {
-            EXT4_SUPER_MAGIC | XFS_SUPER_MAGIC | FUSE_SUPER_MAGIC | ZFS_SUPER_MAGIC => {
+            fs::magic::EXT4_SUPER_MAGIC |
+            fs::magic::XFS_SUPER_MAGIC |
+            fs::magic::FUSE_SUPER_MAGIC |
+            fs::magic::ZFS_SUPER_MAGIC => {
                 let mut fsxattr = fs::FSXAttr::default();
                 let res = unsafe {
                     fs::fs_ioc_fsgetxattr(fd, &mut fsxattr)
@@ -1108,10 +1114,12 @@ fn detect_fs_type(fd: RawFd) -> Result<i64, Error> {
 
 #[inline(always)]
 pub fn is_temporary_file_system(magic: i64) -> bool {
+    use fs::magic::*;
     magic == RAMFS_MAGIC || magic == TMPFS_MAGIC
 }
 
 pub fn is_virtual_file_system(magic: i64) -> bool {
+    use fs::magic::*;
 
     match magic {
         BINFMTFS_MAGIC |
diff --git a/src/pxar/format_definition.rs b/src/pxar/format_definition.rs
index 2b675d2e..0986d5c9 100644
--- a/src/pxar/format_definition.rs
+++ b/src/pxar/format_definition.rs
@@ -389,35 +389,6 @@ pub fn ca_feature_flags_from_fat_attr(attr: u32) -> u64 {
     flags
 }
 
-// from /usr/include/linux/magic.h
-// and from casync util.h
-pub const BINFMTFS_MAGIC: i64 =        0x42494e4d;
-pub const CGROUP2_SUPER_MAGIC: i64 =   0x63677270;
-pub const CGROUP_SUPER_MAGIC: i64 =    0x0027e0eb;
-pub const CONFIGFS_MAGIC: i64 =        0x62656570;
-pub const DEBUGFS_MAGIC: i64 =         0x64626720;
-pub const DEVPTS_SUPER_MAGIC: i64 =    0x00001cd1;
-pub const EFIVARFS_MAGIC: i64 =        0xde5e81e4;
-pub const FUSE_CTL_SUPER_MAGIC: i64 =  0x65735543;
-pub const HUGETLBFS_MAGIC: i64 =       0x958458f6;
-pub const MQUEUE_MAGIC: i64 =          0x19800202;
-pub const NFSD_MAGIC: i64 =            0x6e667364;
-pub const PROC_SUPER_MAGIC: i64 =      0x00009fa0;
-pub const PSTOREFS_MAGIC: i64 =        0x6165676C;
-pub const RPCAUTH_GSSMAGIC: i64 =      0x67596969;
-pub const SECURITYFS_MAGIC: i64 =      0x73636673;
-pub const SELINUX_MAGIC: i64 =         0xf97cff8c;
-pub const SMACK_MAGIC: i64 =           0x43415d53;
-pub const RAMFS_MAGIC: i64 =           0x858458f6;
-pub const TMPFS_MAGIC: i64 =           0x01021994;
-pub const SYSFS_MAGIC: i64 =           0x62656572;
-pub const MSDOS_SUPER_MAGIC: i64 =     0x00004d44;
-pub const BTRFS_SUPER_MAGIC: i64 =     0x9123683E;
-pub const FUSE_SUPER_MAGIC: i64 =      0x65735546;
-pub const EXT4_SUPER_MAGIC: i64 =      0x0000EF53;
-pub const XFS_SUPER_MAGIC: i64 =       0x58465342;
-pub const ZFS_SUPER_MAGIC: i64 =       0x2FC12FC1;
-
 /// Definitions of typical feature flags for the *pxar* encoder/decoder.
 /// By this expensive syscalls for unsupported features are avoided.
 
@@ -489,6 +460,8 @@ pub const CA_FORMAT_DEFAULT: u64 =
 
 /// Return the supported *pxar* feature flags based on the magic number of the filesystem.
 pub fn feature_flags_from_magic(magic: i64) -> u64 {
+    use crate::tools::fs::magic::*;
+
     match magic {
         MSDOS_SUPER_MAGIC => {
             CA_FORMAT_WITH_2SEC_TIME|
diff --git a/src/tools/fs.rs b/src/tools/fs.rs
index a51d50ce..13f8d085 100644
--- a/src/tools/fs.rs
+++ b/src/tools/fs.rs
@@ -259,3 +259,5 @@ impl Default for FSXAttr {
         }
     }
 }
+
+pub (crate) mod magic;
diff --git a/src/tools/fs/magic.rs b/src/tools/fs/magic.rs
new file mode 100644
index 00000000..8ca0e8dc
--- /dev/null
+++ b/src/tools/fs/magic.rs
@@ -0,0 +1,30 @@
+//! Filesystem related magic numbers
+
+// from /usr/include/linux/magic.h
+// and from casync util.h
+pub const BINFMTFS_MAGIC: i64 =        0x42494e4d;
+pub const CGROUP2_SUPER_MAGIC: i64 =   0x63677270;
+pub const CGROUP_SUPER_MAGIC: i64 =    0x0027e0eb;
+pub const CONFIGFS_MAGIC: i64 =        0x62656570;
+pub const DEBUGFS_MAGIC: i64 =         0x64626720;
+pub const DEVPTS_SUPER_MAGIC: i64 =    0x00001cd1;
+pub const EFIVARFS_MAGIC: i64 =        0xde5e81e4;
+pub const FUSE_CTL_SUPER_MAGIC: i64 =  0x65735543;
+pub const HUGETLBFS_MAGIC: i64 =       0x958458f6;
+pub const MQUEUE_MAGIC: i64 =          0x19800202;
+pub const NFSD_MAGIC: i64 =            0x6e667364;
+pub const PROC_SUPER_MAGIC: i64 =      0x00009fa0;
+pub const PSTOREFS_MAGIC: i64 =        0x6165676C;
+pub const RPCAUTH_GSSMAGIC: i64 =      0x67596969;
+pub const SECURITYFS_MAGIC: i64 =      0x73636673;
+pub const SELINUX_MAGIC: i64 =         0xf97cff8c;
+pub const SMACK_MAGIC: i64 =           0x43415d53;
+pub const RAMFS_MAGIC: i64 =           0x858458f6;
+pub const TMPFS_MAGIC: i64 =           0x01021994;
+pub const SYSFS_MAGIC: i64 =           0x62656572;
+pub const MSDOS_SUPER_MAGIC: i64 =     0x00004d44;
+pub const BTRFS_SUPER_MAGIC: i64 =     0x9123683E;
+pub const FUSE_SUPER_MAGIC: i64 =      0x65735546;
+pub const EXT4_SUPER_MAGIC: i64 =      0x0000EF53;
+pub const XFS_SUPER_MAGIC: i64 =       0x58465342;
+pub const ZFS_SUPER_MAGIC: i64 =       0x2FC12FC1;