import ext2fs lib to prep for new e2fsprogs

e2fsprogs/ext2fs/jfs_dat.h

@@ -0,0 +1,64 @@
+/*
+ * jfs_dat.h --- stripped down header file which only contains the JFS
+ * 	on-disk data structures
+ */
+
+#define JFS_MAGIC_NUMBER 0xc03b3998U /* The first 4 bytes of /dev/random! */
+
+/*
+ * On-disk structures
+ */
+
+/* 
+ * Descriptor block types:
+ */
+
+#define JFS_DESCRIPTOR_BLOCK	1
+#define JFS_COMMIT_BLOCK	2
+#define JFS_SUPERBLOCK		3
+
+/*
+ * Standard header for all descriptor blocks:
+ */
+typedef struct journal_header_s
+{
+	__u32		h_magic;
+	__u32		h_blocktype;
+	__u32		h_sequence;
+} journal_header_t;
+
+
+/* 
+ * The block tag: used to describe a single buffer in the journal 
+ */
+typedef struct journal_block_tag_s
+{
+	__u32		t_blocknr;	/* The on-disk block number */
+	__u32		t_flags;	/* See below */
+} journal_block_tag_t;
+
+/* Definitions for the journal tag flags word: */
+#define JFS_FLAG_ESCAPE		1	/* on-disk block is escaped */
+#define JFS_FLAG_SAME_UUID	2	/* block has same uuid as previous */
+#define JFS_FLAG_DELETED	4	/* block deleted by this transaction */
+#define JFS_FLAG_LAST_TAG	8	/* last tag in this descriptor block */
+
+
+/*
+ * The journal superblock
+ */
+typedef struct journal_superblock_s
+{
+	journal_header_t s_header;
+
+	/* Static information describing the journal */
+	__u32		s_blocksize;	/* journal device blocksize */
+	__u32		s_maxlen;	/* total blocks in journal file */
+	__u32		s_first;	/* first block of log information */
+	
+	/* Dynamic information describing the current state of the log */
+	__u32		s_sequence;	/* first commit ID expected in log */
+	__u32		s_start;	/* blocknr of start of log */
+	
+} journal_superblock_t;
+