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Diffstat (limited to 'fs/jffs2/summary.h')
| -rw-r--r-- | fs/jffs2/summary.h | 183 |
1 files changed, 183 insertions, 0 deletions
diff --git a/fs/jffs2/summary.h b/fs/jffs2/summary.h new file mode 100644 index 00000000000..e6b0a69acbd --- /dev/null +++ b/fs/jffs2/summary.h @@ -0,0 +1,183 @@ +/* + * JFFS2 -- Journalling Flash File System, Version 2. + * + * Copyright (C) 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. + * + * $Id: summary.h,v 1.1 2005/09/07 08:34:54 havasi Exp $ + * + */ + +#ifndef JFFS2_SUMMARY_H +#define JFFS2_SUMMARY_H + +#include <linux/uio.h> +#include <linux/jffs2.h> + +#define DIRTY_SPACE(x) do { typeof(x) _x = (x); \ + c->free_size -= _x; c->dirty_size += _x; \ + jeb->free_size -= _x ; jeb->dirty_size += _x; \ + }while(0) +#define USED_SPACE(x) do { typeof(x) _x = (x); \ + c->free_size -= _x; c->used_size += _x; \ + jeb->free_size -= _x ; jeb->used_size += _x; \ + }while(0) +#define WASTED_SPACE(x) do { typeof(x) _x = (x); \ + c->free_size -= _x; c->wasted_size += _x; \ + jeb->free_size -= _x ; jeb->wasted_size += _x; \ + }while(0) +#define UNCHECKED_SPACE(x) do { typeof(x) _x = (x); \ + c->free_size -= _x; c->unchecked_size += _x; \ + jeb->free_size -= _x ; jeb->unchecked_size += _x; \ + }while(0) + +#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)) + +/* Summary structures used on flash */ + +struct jffs2_sum_unknown_flash +{ + jint16_t nodetype; /* node type */ +}; + +struct jffs2_sum_inode_flash +{ + jint16_t nodetype; /* node type */ + jint32_t inode; /* inode number */ + jint32_t version; /* inode version */ + jint32_t offset; /* offset on jeb */ + jint32_t totlen; /* record length */ +} __attribute__((packed)); + +struct jffs2_sum_dirent_flash +{ + jint16_t nodetype; /* == JFFS_NODETYPE_DIRENT */ + jint32_t totlen; /* record length */ + jint32_t offset; /* offset on jeb */ + jint32_t pino; /* parent inode */ + jint32_t version; /* dirent version */ + jint32_t ino; /* == zero for unlink */ + uint8_t nsize; /* dirent name size */ + uint8_t type; /* dirent type */ + uint8_t name[0]; /* dirent name */ +} __attribute__((packed)); + +union jffs2_sum_flash +{ + struct jffs2_sum_unknown_flash u; + struct jffs2_sum_inode_flash i; + struct jffs2_sum_dirent_flash d; +}; + +/* Summary structures used in the memory */ + +struct jffs2_sum_unknown_mem +{ + union jffs2_sum_mem *next; + jint16_t nodetype; /* node type */ +}; + +struct jffs2_sum_inode_mem +{ + union jffs2_sum_mem *next; + jint16_t nodetype; /* node type */ + jint32_t inode; /* inode number */ + jint32_t version; /* inode version */ + jint32_t offset; /* offset on jeb */ + jint32_t totlen; /* record length */ +} __attribute__((packed)); + +struct jffs2_sum_dirent_mem +{ + union jffs2_sum_mem *next; + jint16_t nodetype; /* == JFFS_NODETYPE_DIRENT */ + jint32_t totlen; /* record length */ + jint32_t offset; /* ofset on jeb */ + jint32_t pino; /* parent inode */ + jint32_t version; /* dirent version */ + jint32_t ino; /* == zero for unlink */ + uint8_t nsize; /* dirent name size */ + uint8_t type; /* dirent type */ + uint8_t name[0]; /* dirent name */ +} __attribute__((packed)); + +union jffs2_sum_mem +{ + struct jffs2_sum_unknown_mem u; + struct jffs2_sum_inode_mem i; + struct jffs2_sum_dirent_mem d; +}; + +/* 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; + + jint32_t *sum_buf; /* buffer for writing out summary */ +}; + +/* Summary marker is stored at the end of every sumarized erase block */ + +struct jffs2_sum_marker +{ + jint32_t offset; /* offset of the summary node in the jeb */ + jint32_t magic; /* == JFFS2_SUM_MAGIC */ +}; + +#define JFFS2_SUMMARY_FRAME_SIZE (sizeof(struct jffs2_summary_node) + sizeof(struct jffs2_sum_marker)) + +#ifdef CONFIG_JFFS2_SUMMARY /* SUMMARY SUPPORT ENABLED */ + +#define jffs2_sum_active() (1) +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_scan_sumnode(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, + uint32_t ofs, uint32_t *pseudo_random); + +#else /* SUMMARY DISABLED */ + +#define jffs2_sum_active() (0) +#define jffs2_sum_init(a) (0) +#define jffs2_sum_exit(a) +#define jffs2_sum_disable_collecting(a) +#define jffs2_sum_is_disabled(a) (0) +#define jffs2_sum_reset_collected(a) +#define jffs2_sum_add_kvec(a,b,c,d) (0) +#define jffs2_sum_move_collected(a,b) +#define jffs2_sum_write_sumnode(a) (0) +#define jffs2_sum_add_padding_mem(a,b) +#define jffs2_sum_add_inode_mem(a,b,c) +#define jffs2_sum_add_dirent_mem(a,b,c) +#define jffs2_sum_scan_sumnode(a,b,c,d) (0) + +#endif /* CONFIG_JFFS2_SUMMARY */ + +#endif /* JFFS2_SUMMARY_H */ |