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jffs2: summary support

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This patch adds support for reading fs information from summary
node instead of scanning full eraseblock.

Signed-off-by: Ilya Yanok <yanok@emcraft.com>
This commit is contained in:
Ilya Yanok
2008-11-13 19:49:35 +03:00
committed by Wolfgang Denk
parent 70741004dc
commit 9b7076229e
3 changed files with 368 additions and 1 deletions
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19
include/jffs2/jffs2.h
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@ -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 @@ struct jffs2_raw_inode
/* __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));