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Restructured the major interfaces of the filesystem

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This commit is contained in:
Christopher Haster
2017-03-25 16:20:31 -05:00
parent f566846223
commit 84a57642e5
8 changed files with 481 additions and 444 deletions
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lfs.h
+45 -42
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@@ -38,63 +38,61 @@ enum lfs_open_flags {
LFS_O_SYNC = 0x1000,
};
typedef struct lfs_free {
lfs_disk_struct lfs_disk_free {
lfs_word_t begin;
lfs_word_t end;
} d;
} lfs_free_t;
typedef struct lfs_dir {
lfs_ino_t pair[2];
lfs_off_t i;
lfs_disk_struct lfs_disk_dir {
lfs_word_t rev;
lfs_size_t size;
lfs_ino_t tail[2];
struct lfs_disk_free free;
} d;
} lfs_dir_t;
typedef struct lfs_entry {
lfs_ino_t dir[2];
lfs_block_t dir[2];
lfs_off_t off;
lfs_disk_struct lfs_disk_entry {
struct lfs_disk_entry {
uint16_t type;
uint16_t len;
union {
lfs_disk_struct {
lfs_ino_t head;
struct {
lfs_block_t head;
lfs_size_t size;
} file;
lfs_ino_t dir[2];
lfs_block_t dir[2];
} u;
} d;
} lfs_entry_t;
typedef struct lfs_file {
lfs_ino_t head;
lfs_block_t head;
lfs_size_t size;
lfs_ino_t wblock;
lfs_word_t windex;
lfs_block_t wblock;
uint32_t windex;
lfs_ino_t rblock;
lfs_word_t rindex;
lfs_block_t rblock;
uint32_t rindex;
lfs_off_t roff;
struct lfs_entry entry;
} lfs_file_t;
typedef struct lfs_dir {
lfs_block_t pair[2];
lfs_off_t off;
struct lfs_disk_dir {
uint32_t rev;
lfs_size_t size;
lfs_block_t tail[2];
struct lfs_disk_free {
uint32_t begin;
uint32_t end;
} free;
} d;
} lfs_dir_t;
typedef struct lfs_superblock {
lfs_ino_t pair[2];
lfs_disk_struct lfs_disk_superblock {
lfs_word_t rev;
lfs_block_t pair[2];
struct lfs_disk_superblock {
uint32_t rev;
uint32_t size;
lfs_ino_t root[2];
lfs_block_t root[2];
char magic[8];
uint32_t block_size;
uint32_t block_count;
@@ -104,23 +102,28 @@ typedef struct lfs_superblock {
// Little filesystem type
typedef struct lfs {
lfs_bd_t *bd;
const struct lfs_bd_ops *ops;
const struct lfs_bd_ops *bd_ops;
lfs_ino_t cwd[2];
lfs_free_t free;
struct lfs_bd_info info;
lfs_block_t cwd[2];
struct lfs_disk_free free;
lfs_size_t read_size; // size of read
lfs_size_t prog_size; // size of program
lfs_size_t block_size; // size of erase (block size)
lfs_size_t block_count; // number of erasable blocks
lfs_size_t words; // number of 32-bit words that can fit in a block
} lfs_t;
// Functions
lfs_error_t lfs_create(lfs_t *lfs, lfs_bd_t *bd, const struct lfs_bd_ops *bd_ops);
lfs_error_t lfs_format(lfs_t *lfs);
lfs_error_t lfs_mount(lfs_t *lfs);
int lfs_format(lfs_t *lfs, lfs_bd_t *bd, const struct lfs_bd_ops *bd_ops);
int lfs_mount(lfs_t *lfs, lfs_bd_t *bd, const struct lfs_bd_ops *bd_ops);
int lfs_unmount(lfs_t *lfs);
lfs_error_t lfs_mkdir(lfs_t *lfs, const char *path);
int lfs_mkdir(lfs_t *lfs, const char *path);
lfs_error_t lfs_file_open(lfs_t *lfs, lfs_file_t *file,
int lfs_file_open(lfs_t *lfs, lfs_file_t *file,
const char *path, int flags);
lfs_error_t lfs_file_close(lfs_t *lfs, lfs_file_t *file);
int lfs_file_close(lfs_t *lfs, lfs_file_t *file);
lfs_ssize_t lfs_file_write(lfs_t *lfs, lfs_file_t *file,
const void *buffer, lfs_size_t size);
lfs_ssize_t lfs_file_read(lfs_t *lfs, lfs_file_t *file,