summary.h
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/*
* JFFS2 -- Journalling Flash File System, Version 2.
*
* Copyright © 2004 Ferenc Havasi <havasi@inf.u-szeged.hu>,
* Zoltan Sogor <weth@inf.u-szeged.hu>,
* Patrik Kluba <pajko@halom.u-szeged.hu>,
* University of Szeged, Hungary
*
* For licensing information, see the file 'LICENCE' in this directory.
*
*/
#ifndef JFFS2_SUMMARY_H
#define JFFS2_SUMMARY_H
#define BLK_STATE_ALLFF 0
#define BLK_STATE_CLEAN 1
#define BLK_STATE_PARTDIRTY 2
#define BLK_STATE_CLEANMARKER 3
#define BLK_STATE_ALLDIRTY 4
#define BLK_STATE_BADBLOCK 5
#define JFFS2_SUMMARY_NOSUM_SIZE 0xffffffff
#define JFFS2_SUMMARY_INODE_SIZE (sizeof(struct jffs2_sum_inode_flash))
#define JFFS2_SUMMARY_DIRENT_SIZE(x) (sizeof(struct jffs2_sum_dirent_flash) + (x))
#define JFFS2_SUMMARY_XATTR_SIZE (sizeof(struct jffs2_sum_xattr_flash))
#define JFFS2_SUMMARY_XREF_SIZE (sizeof(struct jffs2_sum_xref_flash))
/* Summary structures used on flash */
struct jffs2_sum_unknown_flash
{
__u16 nodetype; /* node type */
};
struct jffs2_sum_inode_flash
{
__u16 nodetype; /* node type */
__u32 inode; /* inode number */
__u32 version; /* inode version */
__u32 offset; /* offset on jeb */
__u32 totlen; /* record length */
} __attribute__((packed));
struct jffs2_sum_dirent_flash
{
__u16 nodetype; /* == JFFS_NODETYPE_DIRENT */
__u32 totlen; /* record length */
__u32 offset; /* offset on jeb */
__u32 pino; /* parent inode */
__u32 version; /* dirent version */
__u32 ino; /* == zero for unlink */
uint8_t nsize; /* dirent name size */
uint8_t type; /* dirent type */
uint8_t name[0]; /* dirent name */
} __attribute__((packed));
struct jffs2_sum_xattr_flash
{
__u16 nodetype; /* == JFFS2_NODETYPE_XATR */
__u32 xid; /* xattr identifier */
__u32 version; /* version number */
__u32 offset; /* offset on jeb */
__u32 totlen; /* node length */
} __attribute__((packed));
struct jffs2_sum_xref_flash
{
__u16 nodetype; /* == JFFS2_NODETYPE_XREF */
__u32 offset; /* offset on jeb */
} __attribute__((packed));
union jffs2_sum_flash
{
struct jffs2_sum_unknown_flash u;
struct jffs2_sum_inode_flash i;
struct jffs2_sum_dirent_flash d;
struct jffs2_sum_xattr_flash x;
struct jffs2_sum_xref_flash r;
};
/* Summary structures used in the memory */
struct jffs2_sum_unknown_mem
{
union jffs2_sum_mem *next;
__u16 nodetype; /* node type */
};
struct jffs2_sum_inode_mem
{
union jffs2_sum_mem *next;
__u16 nodetype; /* node type */
__u32 inode; /* inode number */
__u32 version; /* inode version */
__u32 offset; /* offset on jeb */
__u32 totlen; /* record length */
} __attribute__((packed));
struct jffs2_sum_dirent_mem
{
union jffs2_sum_mem *next;
__u16 nodetype; /* == JFFS_NODETYPE_DIRENT */
__u32 totlen; /* record length */
__u32 offset; /* ofset on jeb */
__u32 pino; /* parent inode */
__u32 version; /* dirent version */
__u32 ino; /* == zero for unlink */
uint8_t nsize; /* dirent name size */
uint8_t type; /* dirent type */
uint8_t name[0]; /* dirent name */
} __attribute__((packed));
struct jffs2_sum_xattr_mem
{
union jffs2_sum_mem *next;
__u16 nodetype;
__u32 xid;
__u32 version;
__u32 offset;
__u32 totlen;
} __attribute__((packed));
struct jffs2_sum_xref_mem
{
union jffs2_sum_mem *next;
__u16 nodetype;
__u32 offset;
} __attribute__((packed));
union jffs2_sum_mem
{
struct jffs2_sum_unknown_mem u;
struct jffs2_sum_inode_mem i;
struct jffs2_sum_dirent_mem d;
struct jffs2_sum_xattr_mem x;
struct jffs2_sum_xref_mem r;
};
/* Summary related information stored in superblock */
struct jffs2_summary
{
uint32_t sum_size; /* collected summary information for nextblock */
uint32_t sum_num;
uint32_t sum_padded;
union jffs2_sum_mem *sum_list_head;
union jffs2_sum_mem *sum_list_tail;
__u32 *sum_buf; /* buffer for writing out summary */
};
/* Summary marker is stored at the end of every sumarized erase block */
struct jffs2_sum_marker
{
__u32 offset; /* offset of the summary node in the jeb */
__u32 magic; /* == JFFS2_SUM_MAGIC */
};
#define JFFS2_SUMMARY_FRAME_SIZE (sizeof(struct jffs2_raw_summary) + sizeof(struct jffs2_sum_marker))
#endif /* JFFS2_SUMMARY_H */