group flags bitmasks

src/ext4_structs/block_group_descriptor.rs

@@ -1,5 +1,19 @@
+use bitflags::bitflags;
+
 use super::loadable::LoadAble;
 
+bitflags! {
+    #[derive(Debug, Clone, Copy, PartialEq, Eq)]
+    pub struct GroupFlags: u16 {
+        /// inode table and bitmap are not initialized
+        const INODE_UNINIT = 0x1;
+        /// block bitmap is not initialized
+        const BLOCK_UNINIT = 0x2;
+        /// inode table is zeroed
+        const INODE_ZEROED = 0x4;
+    }
+}
+
 #[allow(dead_code)]
 #[derive(Debug)]
 #[repr(C)]
@@ -22,6 +36,9 @@ pub struct Ext4GroupDesc {
     /// Lower 16-bits of directory count.
     pub bg_used_dirs_count_lo: u16,
 
+    /// Block group flags
+    pub bg_flags: GroupFlags,
+
     /// Lower 32-bits of location of snapshot exclusion bitmap.
     pub bg_exclude_bitmap_lo: u32,
 
@@ -31,10 +48,16 @@ pub struct Ext4GroupDesc {
     /// Lower 16-bits of the inode bitmap checksum.
     pub bg_inode_bitmap_csum_lo: u16,
 
-    /// Lower 16-bits of unused inode count. If set, we needn’t scan past the (sb.s_inodes_per_group - gdt.bg_itable_unused) th entry in the inode table for this group.
+    /// Lower 16-bits of unused inode count.
+    /// If set, we needn’t scan past the (sb.s_inodes_per_group - gdt.bg_itable_unused) th
+    /// entry in the inode table for this group.
     pub bg_itable_unused_lo: u16,
 
-    /// Group descriptor checksum; crc16(sb_uuid+group_num+bg_desc) if the RO_COMPAT_GDT_CSUM feature is set, or crc32c(sb_uuid+group_num+bg_desc) & 0xFFFF if the RO_COMPAT_METADATA_CSUM feature is set. The bg_checksum field in bg_desc is skipped when calculating crc16 checksum, and set to zero if crc32c checksum is used.
+    /// Group descriptor checksum;
+    /// crc16(sb_uuid+group_num+bg_desc) if the RO_COMPAT_GDT_CSUM feature is set,
+    /// or crc32c(sb_uuid+group_num+bg_desc) & 0xFFFF if the RO_COMPAT_METADATA_CSUM feature is set.
+    /// The bg_checksum field in bg_desc is skipped when calculating crc16 checksum, 
+    /// and set to zero if crc32c checksum is used.
     pub bg_checksum: u16,
 
     /// Upper 32-bits of location of block bitmap.
@@ -69,13 +92,6 @@ pub struct Ext4GroupDesc {
 
     /// Padding to 64 bytes.
     pub bg_reserved: u32,
-
-    /// Block group flags.
-    /// Value   Description
-    /// 0x1     inode table and bitmap are not initialized (EXT4_BG_INODE_UNINIT).
-    /// 0x2     block bitmap is not initialized (EXT4_BG_BLOCK_UNINIT).
-    /// 0x3     inode table is zeroed (EXT4_BG_INODE_ZEROED).
-    pub bg_flags: u16,
 }
 
 impl LoadAble for Ext4GroupDesc {}

src/ext4_structs/inode.rs

@@ -62,6 +62,7 @@ bitflags! {
         const Ext4NodumpFl = 0x00000040;
         /// do not update atime
         const Ext4NoatimeFl = 0x00000080;
+        ///
         const Ext4DirtyFl = 0x00000100;
         /// One or more compressed clusters
         const Ext4ComprblkFl = 0x00000200;