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Merge pull request #872 from littlefs-project/fs-grow

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Add lfs_fs_grow to enable limited resizing of the filesystem
This commit is contained in:
Christopher Haster
2023-09-21 12:11:35 -05:00
committed by GitHub
parent e4b7fa15c1 23505fa9fa
commit 1ba4ed03f0
3 changed files with 169 additions and 0 deletions
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lfs.c
+54
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@@ -5033,6 +5033,44 @@ static lfs_ssize_t lfs_fs_rawsize(lfs_t *lfs) {
return size;
}
#ifndef LFS_READONLY
int lfs_fs_rawgrow(lfs_t *lfs, lfs_size_t block_count) {
// shrinking is not supported
LFS_ASSERT(block_count >= lfs->block_count);
if (block_count > lfs->block_count) {
lfs->block_count = block_count;
// fetch the root
lfs_mdir_t root;
int err = lfs_dir_fetch(lfs, &root, lfs->root);
if (err) {
return err;
}
// update the superblock
lfs_superblock_t superblock;
lfs_stag_t tag = lfs_dir_get(lfs, &root, LFS_MKTAG(0x7ff, 0x3ff, 0),
LFS_MKTAG(LFS_TYPE_INLINESTRUCT, 0, sizeof(superblock)),
&superblock);
if (tag < 0) {
return tag;
}
lfs_superblock_fromle32(&superblock);
superblock.block_count = lfs->block_count;
lfs_superblock_tole32(&superblock);
err = lfs_dir_commit(lfs, &root, LFS_MKATTRS(
{tag, &superblock}));
if (err) {
return err;
}
}
return 0;
}
#endif
#ifdef LFS_MIGRATE
////// Migration from littelfs v1 below this //////
@@ -6216,6 +6254,22 @@ int lfs_fs_mkconsistent(lfs_t *lfs) {
}
#endif
#ifndef LFS_READONLY
int lfs_fs_grow(lfs_t *lfs, lfs_size_t block_count) {
int err = LFS_LOCK(lfs->cfg);
if (err) {
return err;
}
LFS_TRACE("lfs_fs_grow(%p, %"PRIu32")", (void*)lfs, block_count);
err = lfs_fs_rawgrow(lfs, block_count);
LFS_TRACE("lfs_fs_grow -> %d", err);
LFS_UNLOCK(lfs->cfg);
return err;
}
#endif
#ifdef LFS_MIGRATE
int lfs_migrate(lfs_t *lfs, const struct lfs_config *cfg) {
int err = LFS_LOCK(cfg);