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From: Zheng Liu <lz@FreeBSD.org>
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Subject: PERFORCE change 180105 for review
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http://p4web.freebsd.org/@@180105?ac=10

Change 180105 by lz@gnehzuil-freebsd on 2010/06/22 11:32:20

	       Add three data structures into ext2_extents.h.

Affected files ...

.. //depot/projects/soc2010/ext4fs/src/sys/fs/ext2fs/ext2_extents.h#2 edit

Differences ...

==== //depot/projects/soc2010/ext4fs/src/sys/fs/ext2fs/ext2_extents.h#2 (text+ko) ====

@@ -28,4 +28,37 @@
 #ifndef _FS_EXT2FS_EXT2_EXTENTS_H_
 #define _FS_EXT2FS_EXT2_EXTENTS_H_
 
+#define EXT4_EXT_MAGIC  0xf30a
+
+/*
+ * ext4 file system extent on disk
+ */
+struct ext4_extent {
+        u_int32_t e_blk;        /* first logical block */
+        u_int16_t e_len;        /* number of blocks */
+        u_int16_t e_start_hi;   /* high 16 bits of physical block */
+        u_int32_t e_start_lo;   /* low 32 bits of physical block */
+};
+
+/*
+ * extent index on disk
+ */
+struct ext4_extent_index {
+        u_int32_t ei_blk;       /* indexes logical blocks */
+        u_int32_t ei_leaf_lo;   /* pointes to physical block of the next level */
+        u_int16_t ei_leaf_hi;   /* high 16 bits of physical block */
+        u_int16_t ei_unused;
+};
+
+/*
+ * extent tree header
+ */
+struct ext4_extent_header {
+        u_int16_t eh_magic;     /* magic number: 0xf30a */
+        u_int16_t eh_ecount;    /* number of valid entries */
+        u_int16_t eh_max;       /* capacity of store in entries */
+        u_int16_t eh_depth;     /* the depth of extent tree */
+        u_int32_t eh_gen;       /* generation of extent tree */
+};
+
 #endif /* !_FS_EXT2FS_EXT2_EXTENTS_H_ */