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