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littlefs
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introduce lfs->block_count. If cfg->block_count is 0, autopopulate from superblock

This commit is contained in:
Brian Pugh 2023-08-16 22:18:40 -07:00
parent 6dae7038f9
commit be6812213d
2 changed files with 41 additions and 15 deletions
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54
lfs.c
View File

@ -46,7 +46,7 @@ static int lfs_bd_read(lfs_t *lfs,
lfs_block_t block, lfs_off_t off,
void *buffer, lfs_size_t size) {
uint8_t *data = buffer;
if (block >= lfs->cfg->block_count ||
if (block >= lfs->block_count ||
off+size > lfs->cfg->block_size) {
return LFS_ERR_CORRUPT;
}
@ -104,7 +104,7 @@ static int lfs_bd_read(lfs_t *lfs,
}
// load to cache, first condition can no longer fail
LFS_ASSERT(block < lfs->cfg->block_count);
LFS_ASSERT(block < lfs->block_count);
rcache->block = block;
rcache->off = lfs_aligndown(off, lfs->cfg->read_size);
rcache->size = lfs_min(
@ -176,7 +176,7 @@ static int lfs_bd_crc(lfs_t *lfs,
static int lfs_bd_flush(lfs_t *lfs,
lfs_cache_t *pcache, lfs_cache_t *rcache, bool validate) {
if (pcache->block != LFS_BLOCK_NULL && pcache->block != LFS_BLOCK_INLINE) {
LFS_ASSERT(pcache->block < lfs->cfg->block_count);
LFS_ASSERT(pcache->block < lfs->block_count);
lfs_size_t diff = lfs_alignup(pcache->size, lfs->cfg->prog_size);
int err = lfs->cfg->prog(lfs->cfg, pcache->block,
pcache->off, pcache->buffer, diff);
@ -229,7 +229,7 @@ static int lfs_bd_prog(lfs_t *lfs,
lfs_block_t block, lfs_off_t off,
const void *buffer, lfs_size_t size) {
const uint8_t *data = buffer;
LFS_ASSERT(block == LFS_BLOCK_INLINE || block < lfs->cfg->block_count);
LFS_ASSERT(block == LFS_BLOCK_INLINE || block < lfs->block_count);
LFS_ASSERT(off + size <= lfs->cfg->block_size);
while (size > 0) {
@ -273,7 +273,7 @@ static int lfs_bd_prog(lfs_t *lfs,
#ifndef LFS_READONLY
static int lfs_bd_erase(lfs_t *lfs, lfs_block_t block) {
LFS_ASSERT(block < lfs->cfg->block_count);
LFS_ASSERT(block < lfs->block_count);
int err = lfs->cfg->erase(lfs->cfg, block);
LFS_ASSERT(err <= 0);
return err;
@ -597,7 +597,7 @@ static int lfs_rawunmount(lfs_t *lfs);
static int lfs_alloc_lookahead(void *p, lfs_block_t block) {
lfs_t *lfs = (lfs_t*)p;
lfs_block_t off = ((block - lfs->free.off)
+ lfs->cfg->block_count) % lfs->cfg->block_count;
+ lfs->block_count) % lfs->block_count;
if (off < lfs->free.size) {
lfs->free.buffer[off / 32] |= 1U << (off % 32);
@ -611,7 +611,7 @@ static int lfs_alloc_lookahead(void *p, lfs_block_t block) {
// is to prevent blocks from being garbage collected in the middle of a
// commit operation
static void lfs_alloc_ack(lfs_t *lfs) {
lfs->free.ack = lfs->cfg->block_count;
lfs->free.ack = lfs->block_count;
}
// drop the lookahead buffer, this is done during mounting and failed
@ -632,7 +632,7 @@ static int lfs_alloc(lfs_t *lfs, lfs_block_t *block) {
if (!(lfs->free.buffer[off / 32] & (1U << (off % 32)))) {
// found a free block
*block = (lfs->free.off + off) % lfs->cfg->block_count;
*block = (lfs->free.off + off) % lfs->block_count;
// eagerly find next off so an alloc ack can
// discredit old lookahead blocks
@ -655,7 +655,7 @@ static int lfs_alloc(lfs_t *lfs, lfs_block_t *block) {
}
lfs->free.off = (lfs->free.off + lfs->free.size)
% lfs->cfg->block_count;
% lfs->block_count;
lfs->free.size = lfs_min(8*lfs->cfg->lookahead_size, lfs->free.ack);
lfs->free.i = 0;
@ -1067,7 +1067,7 @@ static lfs_stag_t lfs_dir_fetchmatch(lfs_t *lfs,
// if either block address is invalid we return LFS_ERR_CORRUPT here,
// otherwise later writes to the pair could fail
if (pair[0] >= lfs->cfg->block_count || pair[1] >= lfs->cfg->block_count) {
if (lfs->block_count && (pair[0] >= lfs->block_count || pair[1] >= lfs->block_count)) {
return LFS_ERR_CORRUPT;
}
@ -2140,7 +2140,7 @@ static int lfs_dir_splittingcompact(lfs_t *lfs, lfs_mdir_t *dir,
// do we have extra space? littlefs can't reclaim this space
// by itself, so expand cautiously
if ((lfs_size_t)size < lfs->cfg->block_count/2) {
if ((lfs_size_t)size < lfs->block_count/2) {
LFS_DEBUG("Expanding superblock at rev %"PRIu32, dir->rev);
int err = lfs_dir_split(lfs, dir, attrs, attrcount,
source, begin, end);
@ -4095,6 +4095,7 @@ static int lfs_rawremoveattr(lfs_t *lfs, const char *path, uint8_t type) {
/// Filesystem operations ///
static int lfs_init(lfs_t *lfs, const struct lfs_config *cfg) {
lfs->cfg = cfg;
lfs->block_count = cfg->block_count; // May be 0
int err = 0;
#ifdef LFS_MULTIVERSION
@ -4415,11 +4416,26 @@ static int lfs_rawformat(lfs_t *lfs, const struct lfs_config *cfg) {
return err;
}
if(cfg->block_count == 0){
// Attempt to read a (possibly) prior superblock
lfs_superblock_t superblock;
err = lfs_scan_for_superblock(lfs, &superblock);
if(err){
return err;
}
lfs->block_count = superblock.block_count;
err = lfs_validate_superblock(lfs, &superblock);
if(err){
return err;
}
}
// create free lookahead
memset(lfs->free.buffer, 0, lfs->cfg->lookahead_size);
lfs->free.off = 0;
lfs->free.size = lfs_min(8*lfs->cfg->lookahead_size,
lfs->cfg->block_count);
lfs->block_count);
lfs->free.i = 0;
lfs_alloc_ack(lfs);
@ -4434,7 +4450,7 @@ static int lfs_rawformat(lfs_t *lfs, const struct lfs_config *cfg) {
lfs_superblock_t superblock = {
.version = lfs_fs_disk_version(lfs),
.block_size = lfs->cfg->block_size,
.block_count = lfs->cfg->block_count,
.block_count = lfs->block_count,
.name_max = lfs->name_max,
.file_max = lfs->file_max,
.attr_max = lfs->attr_max,
@ -4484,6 +4500,10 @@ static int lfs_rawmount(lfs_t *lfs, const struct lfs_config *cfg) {
goto cleanup;
}
if(lfs->block_count == 0){
lfs->block_count = superblock.block_count;
}
err = lfs_validate_superblock(lfs, &superblock);
if(err){
return err;
@ -4506,7 +4526,7 @@ static int lfs_rawmount(lfs_t *lfs, const struct lfs_config *cfg) {
// setup free lookahead, to distribute allocations uniformly across
// boots, we start the allocator at a random location
lfs->free.off = lfs->seed % lfs->cfg->block_count;
lfs->free.off = lfs->seed % lfs->block_count;
lfs_alloc_drop(lfs);
return 0;
@ -4815,7 +4835,7 @@ static int lfs_fs_desuperblock(lfs_t *lfs) {
lfs_superblock_t superblock = {
.version = lfs_fs_disk_version(lfs),
.block_size = lfs->cfg->block_size,
.block_count = lfs->cfg->block_count,
.block_count = lfs->block_count,
.name_max = lfs->name_max,
.file_max = lfs->file_max,
.attr_max = lfs->attr_max,
@ -5493,6 +5513,10 @@ static int lfs1_unmount(lfs_t *lfs) {
/// v1 migration ///
static int lfs_rawmigrate(lfs_t *lfs, const struct lfs_config *cfg) {
struct lfs1 lfs1;
if(cfg->block_count == 0){
// Indeterminate filesystem size not allowed for migration.
return LFS_ERR_INVAL;
}
int err = lfs1_mount(lfs, &lfs1, cfg);
if (err) {
return err;

2
lfs.h
View File

@ -437,6 +437,8 @@ typedef struct lfs {
lfs_size_t file_max;
lfs_size_t attr_max;
lfs_size_t block_count;
#ifdef LFS_MIGRATE
struct lfs1 *lfs1;
#endif