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213 lines
6.4 KiB
213 lines
6.4 KiB
/* |
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* JFFS2 -- Journalling Flash File System, Version 2. |
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* |
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* Copyright © 2004 Ferenc Havasi <[email protected]>, |
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* Zoltan Sogor <[email protected]>, |
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* Patrik Kluba <[email protected]>, |
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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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/* Limit summary size to 64KiB so that we can kmalloc it. If the summary |
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is larger than that, we have to just ditch it and avoid using summary |
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for the eraseblock in question... and it probably doesn't hurt us much |
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anyway. */ |
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#define MAX_SUMMARY_SIZE 65536 |
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#include <linux/uio.h> |
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#include <linux/jffs2.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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jint16_t nodetype; /* node type */ |
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}; |
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struct jffs2_sum_inode_flash |
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{ |
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jint16_t nodetype; /* node type */ |
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jint32_t inode; /* inode number */ |
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jint32_t version; /* inode version */ |
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jint32_t offset; /* offset on jeb */ |
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jint32_t 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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jint16_t nodetype; /* == JFFS_NODETYPE_DIRENT */ |
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jint32_t totlen; /* record length */ |
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jint32_t offset; /* offset on jeb */ |
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jint32_t pino; /* parent inode */ |
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jint32_t version; /* dirent version */ |
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jint32_t 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[]; /* 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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jint16_t nodetype; /* == JFFS2_NODETYPE_XATR */ |
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jint32_t xid; /* xattr identifier */ |
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jint32_t version; /* version number */ |
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jint32_t offset; /* offset on jeb */ |
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jint32_t 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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jint16_t nodetype; /* == JFFS2_NODETYPE_XREF */ |
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jint32_t 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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jint16_t 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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jint16_t nodetype; /* node type */ |
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jint32_t inode; /* inode number */ |
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jint32_t version; /* inode version */ |
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jint32_t offset; /* offset on jeb */ |
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jint32_t 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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jint16_t nodetype; /* == JFFS_NODETYPE_DIRENT */ |
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jint32_t totlen; /* record length */ |
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jint32_t offset; /* ofset on jeb */ |
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jint32_t pino; /* parent inode */ |
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jint32_t version; /* dirent version */ |
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jint32_t 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[]; /* 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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jint16_t nodetype; |
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jint32_t xid; |
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jint32_t version; |
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jint32_t offset; |
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jint32_t 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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jint16_t nodetype; |
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jint32_t 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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jint32_t *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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jint32_t offset; /* offset of the summary node in the jeb */ |
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jint32_t 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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#ifdef CONFIG_JFFS2_SUMMARY /* SUMMARY SUPPORT ENABLED */ |
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#define jffs2_sum_active() (1) |
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int jffs2_sum_init(struct jffs2_sb_info *c); |
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void jffs2_sum_exit(struct jffs2_sb_info *c); |
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void jffs2_sum_disable_collecting(struct jffs2_summary *s); |
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int jffs2_sum_is_disabled(struct jffs2_summary *s); |
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void jffs2_sum_reset_collected(struct jffs2_summary *s); |
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void jffs2_sum_move_collected(struct jffs2_sb_info *c, struct jffs2_summary *s); |
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int jffs2_sum_add_kvec(struct jffs2_sb_info *c, const struct kvec *invecs, |
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unsigned long count, uint32_t to); |
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int jffs2_sum_write_sumnode(struct jffs2_sb_info *c); |
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int jffs2_sum_add_padding_mem(struct jffs2_summary *s, uint32_t size); |
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int jffs2_sum_add_inode_mem(struct jffs2_summary *s, struct jffs2_raw_inode *ri, uint32_t ofs); |
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int jffs2_sum_add_dirent_mem(struct jffs2_summary *s, struct jffs2_raw_dirent *rd, uint32_t ofs); |
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int jffs2_sum_add_xattr_mem(struct jffs2_summary *s, struct jffs2_raw_xattr *rx, uint32_t ofs); |
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int jffs2_sum_add_xref_mem(struct jffs2_summary *s, struct jffs2_raw_xref *rr, uint32_t ofs); |
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int jffs2_sum_scan_sumnode(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, |
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struct jffs2_raw_summary *summary, uint32_t sumlen, |
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uint32_t *pseudo_random); |
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#else /* SUMMARY DISABLED */ |
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#define jffs2_sum_active() (0) |
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#define jffs2_sum_init(a) (0) |
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#define jffs2_sum_exit(a) do { } while (0) |
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#define jffs2_sum_disable_collecting(a) |
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#define jffs2_sum_is_disabled(a) (0) |
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#define jffs2_sum_reset_collected(a) do { } while (0) |
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#define jffs2_sum_add_kvec(a,b,c,d) (0) |
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#define jffs2_sum_move_collected(a,b) do { } while (0) |
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#define jffs2_sum_write_sumnode(a) (0) |
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#define jffs2_sum_add_padding_mem(a,b) do { } while (0) |
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#define jffs2_sum_add_inode_mem(a,b,c) do { } while (0) |
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#define jffs2_sum_add_dirent_mem(a,b,c) do { } while (0) |
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#define jffs2_sum_add_xattr_mem(a,b,c) do { } while (0) |
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#define jffs2_sum_add_xref_mem(a,b,c) do { } while (0) |
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#define jffs2_sum_scan_sumnode(a,b,c,d,e) (0) |
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#endif /* CONFIG_JFFS2_SUMMARY */ |
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#endif /* JFFS2_SUMMARY_H */
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