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Cleaned up config options

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- Updated documentation where needed
- Added asserts which take into account relationships with the new
  cache_size configuration
- Restructured ordering to be consistent for the three main
  configurables: LFS_ATTR_MAX, LFS_NAME_MAX, and LFS_INLINE_MAX
This commit is contained in:
Christopher Haster
2018-08-04 16:04:24 -05:00
parent 3cfa08602a
commit 1941bbda76
2 changed files with 54 additions and 56 deletions
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56
lfs.c
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@@ -2703,6 +2703,16 @@ static inline void lfs_superblocktole32(lfs_superblock_t *superblock) {
static int lfs_init(lfs_t *lfs, const struct lfs_config *cfg) {
lfs->cfg = cfg;
// check that block size is a multiple of cache size is a multiple
// of prog and read sizes
LFS_ASSERT(lfs->cfg->cache_size % lfs->cfg->read_size == 0);
LFS_ASSERT(lfs->cfg->cache_size % lfs->cfg->prog_size == 0);
LFS_ASSERT(lfs->cfg->block_size % lfs->cfg->cache_size == 0);
// check that the block size is large enough to fit ctz pointers
LFS_ASSERT(4*lfs_npw2(0xffffffff / (lfs->cfg->block_size-2*4))
<= lfs->cfg->block_size);
// setup read cache
lfs->rcache.block = 0xffffffff;
if (lfs->cfg->read_buffer) {
@@ -2725,7 +2735,7 @@ static int lfs_init(lfs_t *lfs, const struct lfs_config *cfg) {
}
}
// setup lookahead, round down to nearest 32-bits
// setup lookahead, must be multiple of 32-bits
LFS_ASSERT(lfs->cfg->lookahead % 32 == 0);
LFS_ASSERT(lfs->cfg->lookahead > 0);
if (lfs->cfg->lookahead_buffer) {
@@ -2737,22 +2747,12 @@ static int lfs_init(lfs_t *lfs, const struct lfs_config *cfg) {
}
}
// check that block size is a multiple of cache size is a multiple
// of prog and read sizes
LFS_ASSERT(lfs->cfg->cache_size % lfs->cfg->read_size == 0);
LFS_ASSERT(lfs->cfg->cache_size % lfs->cfg->prog_size == 0);
LFS_ASSERT(lfs->cfg->block_size % lfs->cfg->cache_size == 0);
// check that the block size is large enough to fit ctz pointers
LFS_ASSERT(4*lfs_npw2(0xffffffff / (lfs->cfg->block_size-2*4))
<= lfs->cfg->block_size);
// check that the size limits are sane
LFS_ASSERT(lfs->cfg->inline_size <= LFS_INLINE_MAX);
LFS_ASSERT(lfs->cfg->inline_size <= lfs->cfg->read_size); // TODO
LFS_ASSERT(lfs->cfg->inline_size <= lfs->cfg->cache_size);
lfs->inline_size = lfs->cfg->inline_size;
if (!lfs->inline_size) {
lfs->inline_size = lfs_min(LFS_INLINE_MAX, lfs->cfg->read_size);
lfs->inline_size = lfs_min(LFS_INLINE_MAX, lfs->cfg->cache_size);
}
LFS_ASSERT(lfs->cfg->attr_size <= LFS_ATTR_MAX);
@@ -2841,9 +2841,9 @@ int lfs_format(lfs_t *lfs, const struct lfs_config *cfg) {
.block_size = lfs->cfg->block_size,
.block_count = lfs->cfg->block_count,
.inline_size = lfs->inline_size,
.attr_size = lfs->attr_size,
.name_size = lfs->name_size,
.inline_size = lfs->inline_size,
};
lfs_superblocktole32(&superblock);
@@ -2883,9 +2883,6 @@ int lfs_mount(lfs_t *lfs, const struct lfs_config *cfg) {
lfs_mdir_t superdir;
err = lfs_dir_fetch(lfs, &superdir, (const lfs_block_t[2]){0, 1});
if (err) {
if (err == LFS_ERR_CORRUPT) {
LFS_ERROR("Invalid superblock at %d %d", 0, 1);
}
return err;
}
@@ -2899,8 +2896,8 @@ int lfs_mount(lfs_t *lfs, const struct lfs_config *cfg) {
lfs_superblockfromle32(&superblock);
if (memcmp(superblock.magic, "littlefs", 8) != 0) {
LFS_ERROR("Invalid superblock at %d %d", 0, 1);
return LFS_ERR_CORRUPT;
LFS_ERROR("Invalid superblock \"%.8s\"", superblock.magic);
return LFS_ERR_INVAL;
}
uint16_t major_version = (0xffff & (superblock.version >> 16));
@@ -2919,16 +2916,7 @@ int lfs_mount(lfs_t *lfs, const struct lfs_config *cfg) {
}
lfs_pairfromle32(lfs->root);
if (superblock.inline_size) {
if (superblock.inline_size > lfs->inline_size) {
LFS_ERROR("Unsupported inline size (%d > %d)",
superblock.inline_size, lfs->inline_size);
return LFS_ERR_INVAL;
}
lfs->inline_size = superblock.inline_size;
}
// check superblock configuration
if (superblock.attr_size) {
if (superblock.attr_size > lfs->attr_size) {
LFS_ERROR("Unsupported attr size (%d > %d)",
@@ -2949,6 +2937,16 @@ int lfs_mount(lfs_t *lfs, const struct lfs_config *cfg) {
lfs->name_size = superblock.name_size;
}
if (superblock.inline_size) {
if (superblock.inline_size > lfs->inline_size) {
LFS_ERROR("Unsupported inline size (%d > %d)",
superblock.inline_size, lfs->inline_size);
return LFS_ERR_INVAL;
}
lfs->inline_size = superblock.inline_size;
}
// scan for any global updates
lfs_mdir_t dir = {.tail = {0, 1}};
while (!lfs_pairisnull(dir.tail)) {