| /* |
| * 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 |
| |
| /* 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 65536 |
| |
| #include <linux/uio.h> |
| #include <linux/jffs2.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 |
| { |
| 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)); |
| |
| struct jffs2_sum_xattr_flash |
| { |
| jint16_t nodetype; /* == JFFS2_NODETYPE_XATR */ |
| jint32_t xid; /* xattr identifier */ |
| jint32_t version; /* version number */ |
| jint32_t offset; /* offset on jeb */ |
| jint32_t totlen; /* node length */ |
| } __attribute__((packed)); |
| |
| struct jffs2_sum_xref_flash |
| { |
| jint16_t nodetype; /* == JFFS2_NODETYPE_XREF */ |
| jint32_t 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; |
| 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)); |
| |
| struct jffs2_sum_xattr_mem |
| { |
| union jffs2_sum_mem *next; |
| jint16_t nodetype; |
| jint32_t xid; |
| jint32_t version; |
| jint32_t offset; |
| jint32_t totlen; |
| } __attribute__((packed)); |
| |
| struct jffs2_sum_xref_mem |
| { |
| union jffs2_sum_mem *next; |
| jint16_t nodetype; |
| jint32_t 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; |
| |
| 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_raw_summary) + 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_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() (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_add_xattr_mem(a,b,c) |
| #define jffs2_sum_add_xref_mem(a,b,c) |
| #define jffs2_sum_scan_sumnode(a,b,c,d,e) (0) |
| |
| #endif /* CONFIG_JFFS2_SUMMARY */ |
| |
| #endif /* JFFS2_SUMMARY_H */ |