1 files changed, 64 insertions, 0 deletions

diff --git a/e2fsprogs/ext2fs/jfs_dat.h b/e2fsprogs/ext2fs/jfs_dat.h
new file mode 100644
index 000000000..d6ad9c489
--- /dev/null
+++ b/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;
+