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Added better handling for metadata pairs

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The core algorithim that backs this filesystem's goal of fault
tolerance is the alternating of "metadata pairs". Backed by a
simple core function for reading and writing, makes heavy use
of c99 designated initializers for passing info about multiple
chunks in an erase block.
This commit is contained in:
Christopher Haster
2017-03-12 14:11:52 -06:00
parent 1d36fc606a
commit 106b06a457
4 changed files with 211 additions and 281 deletions
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13
lfs.h
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@@ -12,6 +12,11 @@
// Data structures
enum lfs_error {
LFS_ERROR_OK = 0,
LFS_ERROR_CORRUPT = -3,
};
typedef struct lfs_free {
lfs_disk_struct lfs_disk_free {
lfs_ino_t head;
@@ -22,8 +27,7 @@ typedef struct lfs_free {
} lfs_free_t;
typedef struct lfs_dir {
lfs_ino_t dno[2];
lfs_ino_t pair[2];
lfs_disk_struct lfs_disk_dir {
lfs_word_t rev;
lfs_size_t size;
@@ -63,9 +67,10 @@ typedef struct lfs_entry {
} lfs_entry_t;
typedef struct lfs_superblock {
lfs_ino_t pair[2];
lfs_disk_struct lfs_disk_superblock {
uint32_t rev;
uint32_t count;
lfs_word_t rev;
uint32_t size;
lfs_ino_t root[2];
char magic[8];
uint32_t block_size;