linux/fs/jffs2/summary.h

/*
 * JFFS2 -- Journalling Flash File System, Version 2.
 *
 * Copyright © 2004  Ferenc Havasi <[email protected]>,
 *		     Zoltan Sogor <[email protected]>,
 *		     Patrik Kluba <[email protected]>,
 *		     University of Szeged, Hungary
 *
 * For licensing information, see the file 'LICENCE' in this directory.
 *
 */

#ifndef JFFS2_SUMMARY_H
#define JFFS2_SUMMARY_H

/* Limit summary size to 64KiB so that we can kmalloc it. If the summary
   is larger than that, we have to just ditch it and avoid using summary
   for the eraseblock in question... and it probably doesn't hurt us much
   anyway. */
#define MAX_SUMMARY_SIZE …

#include <linux/uio.h>
#include <linux/jffs2.h>

#define BLK_STATE_ALLFF …
#define BLK_STATE_CLEAN …
#define BLK_STATE_PARTDIRTY …
#define BLK_STATE_CLEANMARKER …
#define BLK_STATE_ALLDIRTY …
#define BLK_STATE_BADBLOCK …

#define JFFS2_SUMMARY_NOSUM_SIZE …
#define JFFS2_SUMMARY_INODE_SIZE …
#define JFFS2_SUMMARY_DIRENT_SIZE(x) …
#define JFFS2_SUMMARY_XATTR_SIZE …
#define JFFS2_SUMMARY_XREF_SIZE …

/* Summary structures used on flash */

struct jffs2_sum_unknown_flash
{ … };

struct jffs2_sum_inode_flash
{ … } __attribute__((packed));

struct jffs2_sum_dirent_flash
{ … } __attribute__((packed));

struct jffs2_sum_xattr_flash
{ … } __attribute__((packed));

struct jffs2_sum_xref_flash
{ … } __attribute__((packed));

jffs2_sum_flash;

/* Summary structures used in the memory */

struct jffs2_sum_unknown_mem
{ … };

struct jffs2_sum_inode_mem
{ … } __attribute__((packed));

struct jffs2_sum_dirent_mem
{ … } __attribute__((packed));

struct jffs2_sum_xattr_mem
{ … } __attribute__((packed));

struct jffs2_sum_xref_mem
{ … } __attribute__((packed));

jffs2_sum_mem;

/* Summary related information stored in superblock */

struct jffs2_summary
{ … };

/* Summary marker is stored at the end of every sumarized erase block */

struct jffs2_sum_marker
{ … };

#define JFFS2_SUMMARY_FRAME_SIZE …

#ifdef CONFIG_JFFS2_SUMMARY	/* SUMMARY SUPPORT ENABLED */

#define jffs2_sum_active() …
int jffs2_sum_init(struct jffs2_sb_info *c);
void jffs2_sum_exit(struct jffs2_sb_info *c);
void jffs2_sum_disable_collecting(struct jffs2_summary *s);
int jffs2_sum_is_disabled(struct jffs2_summary *s);
void jffs2_sum_reset_collected(struct jffs2_summary *s);
void jffs2_sum_move_collected(struct jffs2_sb_info *c, struct jffs2_summary *s);
int jffs2_sum_add_kvec(struct jffs2_sb_info *c, const struct kvec *invecs,
			unsigned long count,  uint32_t to);
int jffs2_sum_write_sumnode(struct jffs2_sb_info *c);
int jffs2_sum_add_padding_mem(struct jffs2_summary *s, uint32_t size);
int jffs2_sum_add_inode_mem(struct jffs2_summary *s, struct jffs2_raw_inode *ri, uint32_t ofs);
int jffs2_sum_add_dirent_mem(struct jffs2_summary *s, struct jffs2_raw_dirent *rd, uint32_t ofs);
int jffs2_sum_add_xattr_mem(struct jffs2_summary *s, struct jffs2_raw_xattr *rx, uint32_t ofs);
int jffs2_sum_add_xref_mem(struct jffs2_summary *s, struct jffs2_raw_xref *rr, uint32_t ofs);
int jffs2_sum_scan_sumnode(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb,
			   struct jffs2_raw_summary *summary, uint32_t sumlen,
			   uint32_t *pseudo_random);

#else				/* SUMMARY DISABLED */

#define jffs2_sum_active …
#define jffs2_sum_init …
#define jffs2_sum_exit …
#define jffs2_sum_disable_collecting …
#define jffs2_sum_is_disabled …
#define jffs2_sum_reset_collected …
#define jffs2_sum_add_kvec …
#define jffs2_sum_move_collected …
#define jffs2_sum_write_sumnode …
#define jffs2_sum_add_padding_mem …
#define jffs2_sum_add_inode_mem …
#define jffs2_sum_add_dirent_mem …
#define jffs2_sum_add_xattr_mem …
#define jffs2_sum_add_xref_mem …
#define jffs2_sum_scan_sumnode …

#endif /* CONFIG_JFFS2_SUMMARY */

#endif /* JFFS2_SUMMARY_H */