jffs2: summary support
This patch adds support for reading fs information from summary
node instead of scanning full eraseblock.
Signed-off-by: Ilya Yanok <yanok@emcraft.com>
diff --git a/include/jffs2/jffs2.h b/include/jffs2/jffs2.h
index d142cd1..ed96bab 100644
--- a/include/jffs2/jffs2.h
+++ b/include/jffs2/jffs2.h
@@ -50,6 +50,9 @@
#define JFFS2_EMPTY_BITMASK 0xffff
#define JFFS2_DIRTY_BITMASK 0x0000
+/* Summary node MAGIC marker */
+#define JFFS2_SUM_MAGIC 0x02851885
+
/* We only allow a single char for length, and 0xFF is empty flash so
we don't want it confused with a real length. Hence max 254.
*/
@@ -89,6 +92,7 @@
#define JFFS2_NODETYPE_INODE (JFFS2_FEATURE_INCOMPAT | JFFS2_NODE_ACCURATE | 2)
#define JFFS2_NODETYPE_CLEANMARKER (JFFS2_FEATURE_RWCOMPAT_DELETE | JFFS2_NODE_ACCURATE | 3)
#define JFFS2_NODETYPE_PADDING (JFFS2_FEATURE_RWCOMPAT_DELETE | JFFS2_NODE_ACCURATE | 4)
+#define JFFS2_NODETYPE_SUMMARY (JFFS2_FEATURE_RWCOMPAT_DELETE | JFFS2_NODE_ACCURATE | 6)
/* Maybe later... */
/*#define JFFS2_NODETYPE_CHECKPOINT (JFFS2_FEATURE_RWCOMPAT_DELETE | JFFS2_NODE_ACCURATE | 3) */
@@ -166,9 +170,24 @@
/* __u8 data[dsize]; */
} __attribute__((packed));
+struct jffs2_raw_summary
+{
+ __u16 magic;
+ __u16 nodetype; /* = JFFS2_NODETYPE_SUMMARY */
+ __u32 totlen;
+ __u32 hdr_crc;
+ __u32 sum_num; /* number of sum entries*/
+ __u32 cln_mkr; /* clean marker size, 0 = no cleanmarker */
+ __u32 padded; /* sum of the size of padding nodes */
+ __u32 sum_crc; /* summary information crc */
+ __u32 node_crc; /* node crc */
+ __u32 sum[0]; /* inode summary info */
+};
+
union jffs2_node_union {
struct jffs2_raw_inode i;
struct jffs2_raw_dirent d;
+ struct jffs2_raw_summary s;
struct jffs2_unknown_node u;
} __attribute__((packed));