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#ifndef LOGFS_H
#define LOGFS_H
#include <asm/types.h>
#include <zlib.h>
#include "btree.h"
#include "kerncompat.h"
#include "logfs_abi.h"
struct super_block;
struct logfs_device_operations {
int (*prepare_sb)(struct super_block *sb);
int (*write)(struct super_block *sb, u64 ofs, size_t size, void *buf);
int (*erase)(struct super_block *sb, u64 ofs, size_t size);
s64 (*scan_super)(struct super_block *sb);
};
struct logfs_area {
u32 segno;
u32 used_bytes;
void *buf;
};
struct super_block {
int fd;
u64 fssize;
u32 segsize;
u32 erasesize;
u32 blocksize;
int blocksize_bits;
u32 writesize;
u32 no_segs;
u32 journal_seg[LOGFS_JOURNAL_SEGS];
u64 used_bytes;
u32 lastseg;
struct logfs_area area[LOGFS_NO_AREAS];
struct logfs_segment_entry *segment_entry;
void *erase_buf;
u64 sb_ofs1;
u64 sb_ofs2;
struct btree_head64 ino_tree;
struct btree_head128 block_tree[LOGFS_NO_AREAS];
const struct logfs_device_operations *dev_ops;
};
struct inode {
struct btree_head64 block_tree[LOGFS_MAX_LEVELS];
struct logfs_disk_inode di;
};
void check_crc32(void);
void fail(const char *s) __attribute__ ((__noreturn__));
struct super_block *open_device(const char *name);
static inline __be32 logfs_crc32(void *data, size_t len, size_t skip)
{
return cpu_to_be32(~crc32(0, data+skip, len-skip));
}
static inline void *zalloc(size_t bytes)
{
void *p = malloc(bytes);
memset(p, 0, bytes);
return p;
}
/* readwrite.c */
struct inode *find_or_create_inode(struct super_block *sb, u64 ino);
int logfs_file_write(struct super_block *sb, u64 ino, u64 bix, u8 level,
u8 type, void *buf);
int logfs_file_flush(struct super_block *sb, u64 ino);
/* segment.c */
u32 get_segment(struct super_block *sb);
s64 logfs_segment_write(struct super_block *sb, void *buf, u8 type,
u64 ino, u64 bix, u8 level);
int flush_segments(struct super_block *sb);
static inline __be32 ec_level(u32 ec, u8 level)
{
return cpu_to_be32((ec << 4) | (level & 0xf));
}
#endif
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