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bootloader/u-boot_2015_04/fs/jffs2/summary.h 4.07 KB
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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 */