openharmony/third_party_littlefs
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Revisited some generic concepts, callbacks, and some reorganization

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- Callbacks for get/match, this does have a code cost, but allows more
  code reuse, which almost balances out the code cost, but also reduces
  maintenance and increased flexibility. Also callbacks may be able to
  be gc-ed in some cases.
- Consistent struct vs _t usage, _t for external-facing struct that
  shouldn't be messed with outside the library. structs for external and
  internal structs where anyone with access is allowed to modify.
- Reorganized several high-level function groups
- Inlined structures that didn't need separate definitions in header
This commit is contained in:
Christopher Haster 2018-09-10 22:07:59 -05:00
parent 617dd87621
commit 5eeeb9d6ac
2 changed files with 705 additions and 679 deletions
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1340
lfs.c
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44
lfs.h
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@ -113,7 +113,7 @@ enum lfs_type {
LFS_FROM_REGION = 0x000,
LFS_FROM_DISK = 0x200,
LFS_FROM_MOVE = 0x0c1,
LFS_FROM_ATTRS = 0x0c2,
LFS_FROM_USERATTRS = 0x0c2,
LFS_FROM_SUPERBLOCK = 0x0c3,
};
@ -284,13 +284,7 @@ struct lfs_file_config {
};
/// littlefs data structures ///
typedef struct lfs_mattr {
int32_t tag;
const void *buffer;
const struct lfs_mattr *next;
} lfs_mattr_t;
/// internal littlefs data structures ///
typedef struct lfs_cache {
lfs_block_t block;
lfs_off_t off;
@ -324,13 +318,7 @@ typedef struct lfs_mdir {
lfs_global_t locals;
} lfs_mdir_t;
typedef struct lfs_mlist {
struct lfs_mlist *next;
uint16_t id;
uint8_t type;
lfs_mdir_t m;
} lfs_mlist_t;
// littlefs directory type
typedef struct lfs_dir {
struct lfs_dir *next;
uint16_t id;
@ -341,6 +329,7 @@ typedef struct lfs_dir {
lfs_block_t head[2];
} lfs_dir_t;
// littlefs file type
typedef struct lfs_file {
struct lfs_file *next;
uint16_t id;
@ -373,26 +362,29 @@ typedef struct lfs_superblock {
lfs_size_t inline_max;
} lfs_superblock_t;
typedef struct lfs_free {
lfs_block_t off;
lfs_block_t size;
lfs_block_t i;
lfs_block_t ack;
uint32_t *buffer;
} lfs_free_t;
// The littlefs type
// The littlefs filesystem type
typedef struct lfs {
lfs_cache_t rcache;
lfs_cache_t pcache;
lfs_block_t root[2];
lfs_mlist_t *mlist;
struct lfs_mlist {
struct lfs_mlist *next;
uint16_t id;
uint8_t type;
lfs_mdir_t m;
} *mlist;
uint32_t seed;
lfs_global_t globals;
lfs_global_t locals;
lfs_free_t free;
struct lfs_free {
lfs_block_t off;
lfs_block_t size;
lfs_block_t i;
lfs_block_t ack;
uint32_t *buffer;
} free;
const struct lfs_config *cfg;
lfs_size_t block_size;