X-Git-Url: https://codewiz.org/gitweb?a=blobdiff_plain;f=fs%2Fbattfs.h;h=846027271b2a484c9f95c915a10bee5ab5828f00;hb=HEAD;hp=6558877f838d9ce607db1677aab8563508b72054;hpb=427cddc05729eee614b076b86651d0210ab4155b;p=bertos.git diff --git a/fs/battfs.h b/fs/battfs.h deleted file mode 100644 index 6558877f..00000000 --- a/fs/battfs.h +++ /dev/null @@ -1,219 +0,0 @@ -/** - * \file - * - * - * \version $Id:$ - * - * \author Francesco Sacchi - * - * \brief BattFS: a filesystem for embedded platforms (interface). - * TODO: Add detailed filesystem description. - */ - -#ifndef FS_BATTFS_H -#define FS_BATTFS_H - -#include // uintXX_t; STATIC_ASSERT -#include // CPU_BITS_PER_CHAR -#include - -typedef uint16_t fill_t; -typedef fill_t pgaddr_t; -typedef uint16_t pgoff_t; -typedef uint32_t mark_t; -typedef uint8_t mark_roll_t; -typedef uint8_t inode_t; -typedef uint8_t seq_t; -typedef rotating_t fcs_t; - -/** - * Size required for free block allocation is at least 1 bit more - * than page addressing. - */ -STATIC_ASSERT(sizeof(mark_t) > sizeof(pgaddr_t)); - -/** - * BattFS page header, used to represent a page - * header in memory. - * To see how this is stored on disk: - * \see battfs_to_disk - * \see disk_to_battfs - */ -typedef struct BattFsPageHeader -{ - inode_t inode; ///< File inode (file identifier). - seq_t seq; ///< Page sequence number. - fill_t fill; ///< Filled bytes in page. - pgoff_t pgoff; ///< Page offset inside file. - mark_t mark; ///< Marker used to keep trace of free/used pages. - - /** - * FCS (Frame Check Sequence) of the page header once the page - * as been marked as free. - */ - fcs_t fcs_free; - - /** - * FCS (Frame Check Sequence) of the page header. - */ - fcs_t fcs; -} BattFsPageHeader; - -/** - * Size of the header once saved on disk. - * \see battfs_to_disk - * \see disk_to_battfs - */ -#define BATTFS_HEADER_LEN 13 - -/** - * Marks for valid pages. - * Simply set to 1 all field bits. - * \{ - */ -#define MARK_PAGE_VALID ((1LL << (CPU_BITS_PER_CHAR * sizeof(mark_t))) - 1) -#define FCS_FREE_VALID ((1 << (CPU_BITS_PER_CHAR * sizeof(fcs_t))) - 1) -/* \} */ - - -/** - * Half-size of free page marker. - * Used to keep trace of free marker wrap-arounds. - */ -#define MARK_HALF_SIZE (1 << (CPU_BITS_PER_CHAR * sizeof(pgaddr_t) + 1)) - -/** - * Maximum page address. - */ -#define MAX_PAGE_ADDR ((1 << (CPU_BITS_PER_CHAR * sizeof(pgaddr_t))) - 1) - -/** - * Max number of files. - */ -#define BATTFS_MAX_FILES (1 << (CPU_BITS_PER_CHAR * sizeof(inode_t))) - -/* Fwd decl */ -struct BattFsSuper; - -/** - * Type for disk page addressing. - */ -typedef uint16_t pgcnt_t; - -/** - * Sentinel used to keep trace of unset pages in disk->page_array. - */ -#define PAGE_UNSET_SENTINEL ((1 << (CPU_BITS_PER_CHAR * sizeof(pgcnt_t))) - 1) - -/** - * Type interface for disk init function. - * \return true if all is ok, false otherwise. - */ -typedef bool (*disk_open_t) (struct BattFsSuper *d); - -/** - * Type interface for disk page read function. - * \a page is the page address, \a addr the address inside the page, - * \a size the lenght to be read. - * \return the number of bytes read. - */ -typedef size_t (*disk_page_read_t) (struct BattFsSuper *d, pgcnt_t page, pgaddr_t addr, void *buf, size_t); - -/** - * Type interface for disk page write function. - * \a page is the page address, \a addr the address inside the page, - * \a size the lenght to be written. - * \return the number of bytes written. - */ -typedef size_t (*disk_page_write_t) (struct BattFsSuper *d, pgcnt_t page, pgaddr_t addr, void *buf, size_t); - -/** - * Type interface for disk page erase function. - * \a page is the page address. - * \return true if all is ok, false otherwise. - */ -typedef bool (*disk_page_erase_t) (struct BattFsSuper *d, pgcnt_t page); - -/** - * Type interface for disk deinit function. - * \return true if all is ok, false otherwise. - */ -typedef bool (*disk_close_t) (struct BattFsSuper *d); - - -typedef uint32_t disk_size_t; ///< Type for disk sizes. - -/** - * Context used to describe a disk. - * This context structure will be used to access disk. - * Must be initialized by hw memory driver. - */ -typedef struct BattFsSuper -{ - disk_open_t open; ///< Disk init. - disk_page_read_t read; ///< Page read. - disk_page_write_t write; ///< Page write. - disk_page_erase_t erase; ///< Page erase. - disk_close_t close; ///< Disk deinit. - - pgaddr_t page_size; ///< Size of a disk page, in bytes. - pgcnt_t page_count; ///< Number of pages on disk. - - /** - * Page allocation array. - * This array must be allocated somewhere and - * must have enough space for page_count elements. - * Is used by the filesystem to represent - * the entire disk in memory. - */ - pgcnt_t *page_array; - - /** - * Lowest free page counter. - * This is the counter of the first availble free page. - */ - mark_t free_start; - - /** - * Highest free page counter. - * This value is the next to be used to mark a block as free. - */ - mark_t free_next; - - disk_size_t disk_size; ///< Size of the disk, in bytes (page_count * page_size). - disk_size_t free_bytes; ///< Free space on the disk. - - /* TODO add other fields. */ -} BattFsSuper; - -bool battfs_init(struct BattFsSuper *d); - -#endif /* FS_BATTFS_H */