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29 * Copyright 2007 Develer S.r.l. (http://www.develer.com/)
35 * \author Francesco Sacchi <batt@develer.com>
37 * \brief BattFS: a filesystem for embedded platforms (interface).
38 * TODO: Add detailed filesystem description.
44 #include <cfg/compiler.h> // uintXX_t; STATIC_ASSERT
45 #include <algo/rotating_hash.h>
47 typedef uint16_t filled_t;
48 typedef uint16_t pgoff_t;
49 typedef uint8_t inode_t;
50 typedef uint8_t seqnum_t;
51 typedef rotating_t fsc_t;
55 * \note fields order is chosen to comply
58 typedef struct BattFsPageHeader
60 inode_t inode; ///< File inode (file identifier).
61 seqnum_t seqnum; ///< bit[1:0]: Page sequence number; bit[7:2] unused for now, must be set to 1.
62 filled_t filled; ///< Filled bytes in page.
63 pgoff_t pgoff; ///< Page offset inside file.
64 fsc_t fsc; ///< CRC of the page header.
67 /* Ensure structure has no padding added */
68 STATIC_ASSERT(sizeof(BattFsPageHeader) == sizeof(filled_t) + sizeof(pgoff_t)
69 + sizeof(inode_t) + sizeof(seqnum_t) + sizeof(fsc_t));
72 * Reset page sequence number of struct \a m to default value (0xFF).
74 #define RESET_SEQ(m) ((m).seqnum = 0xFF)
77 * Get page sequence number from struct \a m.
79 #define SEQ(m) ((m).seqnum & 0x03)
82 * Set sequence number of struct \a m to \a d.
84 #define SET_SEQ(m, d) ((m).seqnum = ((m).seqnum & 0xFC) | ((d) & 0x03))
87 * Increment sequence number of struct \a m.
89 #define INC_SEQ(m) SET_SEQ((m), SEQ(m) + 1)
95 * Type interface for disk init function.
96 * \return true if all is ok, false otherwise.
98 typedef bool (*disk_init_t) (struct BattFsSuper *d);
101 * Type interface for disk page read function.
102 * \a page is the page address, \a size the lenght to be read.
103 * \return the number of bytes read.
105 typedef size_t (*disk_page_read_t) (struct BattFsSuper *d, void *buf, battfs_page_t page, size_t size);
108 * Type interface for disk page write function.
109 * \a page is the page address, \a size the lenght to be written.
110 * \return the number of bytes written.
112 typedef size_t (*disk_page_write_t) (struct BattFsSuper *d, const void *buf, battfs_page_t page, size_t size);
115 * Type interface for disk page erase function.
116 * \a page is the page address.
117 * \return true if all is ok, false otherwise.
119 typedef bool (*disk_page_erase_t) (struct BattFsSuper *d, battfs_page_t page);
121 typedef uint32_t disk_size_t ///< Type for disk sizes.
124 * Context used to describe a disk.
125 * This context structure will be used to access disk.
126 * Must be initialized by hw memory driver.
128 typedef struct BattFsSuper
130 disk_init_t init; ///< Disk init.
131 disk_page_read_t read; ///< Page read.
132 disk_page_write_t write; ///< Page write.
133 disk_page_erase_t erase; ///< Page erase.
135 disk_size_t disk_size; ///< Size of the disk, in bytes.
136 disk_size_t free_bytes; ///< Free space on the disk.
137 /* TODO add other fields. */
140 #endif /* FS_BATTFS_H */