battfs.h

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#ifndef FS_BATTFS_H
#define FS_BATTFS_H

#include <cfg/compiler.h> // uintXX_t; STATIC_ASSERT
#include <cpu/types.h> // CPU_BITS_PER_CHAR
#include <algo/rotating_hash.h>
#include <mware/list.h>
#include <kern/kfile.h>

typedef uint16_t fill_t;    
typedef fill_t   pgaddr_t;  
typedef uint16_t pgcnt_t;   
typedef pgcnt_t  pgoff_t;   
typedef uint32_t mark_t;    
typedef uint8_t  inode_t;   
typedef uint8_t  seq_t;     
typedef rotating_t fcs_t;   

STATIC_ASSERT(sizeof(mark_t) > sizeof(pgcnt_t));

typedef struct BattFsPageHeader
{
    inode_t  inode; 
    seq_t    seq;   
    fill_t   fill;  
    pgoff_t  pgoff; 
    mark_t   mark;  

    fcs_t fcs_free;

    fcs_t fcs;
} BattFsPageHeader;

#define BATTFS_HEADER_LEN 12

#define MARK_PAGE_VALID ((1 << (CPU_BITS_PER_CHAR * sizeof(pgcnt_t) + 1)) - 1)
#define FCS_FREE_VALID  ((1 << (CPU_BITS_PER_CHAR * sizeof(fcs_t))) - 1)
/* \} */


#define MARK_HALF_SIZE (1 << (CPU_BITS_PER_CHAR * sizeof(pgcnt_t) + 1))

#define MAX_PAGE_ADDR ((1 << (CPU_BITS_PER_CHAR * sizeof(pgcnt_t))) - 1)

#define BATTFS_MAX_FILES (1 << (CPU_BITS_PER_CHAR * sizeof(inode_t)))

/* Fwd decl */
struct BattFsSuper;

#define PAGE_UNSET_SENTINEL ((1 << (CPU_BITS_PER_CHAR * sizeof(pgcnt_t))) - 1)

typedef bool (*disk_open_t) (struct BattFsSuper *d);

typedef size_t (*disk_page_read_t) (struct BattFsSuper *d, pgcnt_t page, pgaddr_t addr, void *buf, size_t);

typedef size_t  (*disk_page_write_t) (struct BattFsSuper *d, pgcnt_t page, pgaddr_t addr, const void *buf, size_t);

typedef bool (*disk_page_erase_t) (struct BattFsSuper *d, pgcnt_t page);

typedef bool (*disk_close_t) (struct BattFsSuper *d);


typedef uint32_t disk_size_t; 

typedef struct BattFsSuper
{
    disk_open_t open;        
    disk_page_read_t  read;  
    disk_page_write_t write; 
    disk_page_erase_t erase; 
    disk_close_t close;      

    pgaddr_t page_size;      
    pgcnt_t page_count;      

    pgcnt_t *page_array;

    mark_t free_start;

    mark_t free_next;

    disk_size_t disk_size;   
    disk_size_t free_bytes;  

    List file_opened_list;       
    /* TODO add other fields. */
} BattFsSuper;

typedef uint8_t filemode_t; 
typedef uint32_t file_size_t; 

#define BATTFS_CREATE BV(0)  
#define BATTFS_RD     BV(1)  
#define BATTFS_WR     BV(2)  
/*/}*/


typedef struct KFileBattFs
{
    KFile fd;           
    Node link;          
    inode_t inode;      
    BattFsSuper *disk;  
    filemode_t mode;    
    pgcnt_t *start;     
} KFileBattFs;

#define KFT_BATTFS MAKE_ID('B', 'T', 'F', 'S')

INLINE KFileBattFs * KFILEBATTFS(KFile *fd)
{
    ASSERT(fd->_type == KFT_BATTFS);
    return (KFileBattFs *)fd;
}

bool battfs_init(struct BattFsSuper *d);
bool battfs_close(struct BattFsSuper *disk);

bool battfs_fileExists(BattFsSuper *disk, inode_t inode);
bool battfs_fileopen(BattFsSuper *disk, KFileBattFs *fd, inode_t inode, filemode_t mode);

bool battfs_writeTestBlock(struct BattFsSuper *disk, pgcnt_t page, inode_t inode, seq_t seq, fill_t fill, pgoff_t pgoff, mark_t mark);

#endif /* FS_BATTFS_H */