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Added lfs_fs_stat for accessing configuration in the superblocks

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This is necessary for accessing format-specific information stored in
the superblock after mounting.

As is common in other filesystems this also provides the filesystem
usage. However collecting the filesystem usage is more expensive in
littlefs than other filesystem (and less accurate because of CoW), so
this may need to be cached after mount in the future.
This commit is contained in:
Christopher Haster
2022-11-11 15:34:12 -06:00
parent 21e54ee458
commit c8bc6f96cd
3 changed files with 116 additions and 0 deletions
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tests/test_superblocks.toml
+55
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@@ -157,7 +157,13 @@ code = '''
lfs_format(&lfs, cfg) => 0;
cfg->block_size = 0;
lfs_mount(&lfs, cfg) => 0;
struct lfs_fsinfo fsinfo;
lfs_fs_stat(&lfs, &fsinfo) => 0;
assert(fsinfo.block_size == BLOCK_SIZE);
assert(fsinfo.block_count == BLOCK_COUNT);
lfs_file_t file;
lfs_file_open(&lfs, &file, "test",
LFS_O_CREAT | LFS_O_EXCL | LFS_O_WRONLY) => 0;
@@ -166,6 +172,10 @@ code = '''
lfs_unmount(&lfs) => 0;
lfs_mount(&lfs, cfg) => 0;
lfs_fs_stat(&lfs, &fsinfo) => 0;
assert(fsinfo.block_size == BLOCK_SIZE);
assert(fsinfo.block_count == BLOCK_COUNT);
lfs_file_open(&lfs, &file, "test", LFS_O_RDONLY) => 0;
uint8_t buffer[256];
lfs_file_read(&lfs, &file, buffer, sizeof(buffer)) => 6;
@@ -181,7 +191,13 @@ code = '''
lfs_format(&lfs, cfg) => 0;
cfg->block_count = 0;
lfs_mount(&lfs, cfg) => 0;
struct lfs_fsinfo fsinfo;
lfs_fs_stat(&lfs, &fsinfo) => 0;
assert(fsinfo.block_size == BLOCK_SIZE);
assert(fsinfo.block_count == BLOCK_COUNT);
lfs_file_t file;
lfs_file_open(&lfs, &file, "test",
LFS_O_CREAT | LFS_O_EXCL | LFS_O_WRONLY) => 0;
@@ -190,6 +206,45 @@ code = '''
lfs_unmount(&lfs) => 0;
lfs_mount(&lfs, cfg) => 0;
lfs_fs_stat(&lfs, &fsinfo) => 0;
assert(fsinfo.block_size == BLOCK_SIZE);
assert(fsinfo.block_count == BLOCK_COUNT);
lfs_file_open(&lfs, &file, "test", LFS_O_RDONLY) => 0;
uint8_t buffer[256];
lfs_file_read(&lfs, &file, buffer, sizeof(buffer)) => 6;
lfs_file_close(&lfs, &file) => 0;
assert(memcmp(buffer, "hello!", 6) == 0);
lfs_unmount(&lfs) => 0;
'''
# mount with unknown block_size+block_count
[cases.test_superblocks_unknown_block_size_count]
code = '''
lfs_t lfs;
lfs_format(&lfs, cfg) => 0;
cfg->block_size = 0;
cfg->block_count = 0;
lfs_mount(&lfs, cfg) => 0;
struct lfs_fsinfo fsinfo;
lfs_fs_stat(&lfs, &fsinfo) => 0;
assert(fsinfo.block_size == BLOCK_SIZE);
assert(fsinfo.block_count == BLOCK_COUNT);
lfs_file_t file;
lfs_file_open(&lfs, &file, "test",
LFS_O_CREAT | LFS_O_EXCL | LFS_O_WRONLY) => 0;
lfs_file_write(&lfs, &file, "hello!", 6) => 6;
lfs_file_close(&lfs, &file) => 0;
lfs_unmount(&lfs) => 0;
lfs_mount(&lfs, cfg) => 0;
lfs_fs_stat(&lfs, &fsinfo) => 0;
assert(fsinfo.block_size == BLOCK_SIZE);
assert(fsinfo.block_count == BLOCK_COUNT);
lfs_file_open(&lfs, &file, "test", LFS_O_RDONLY) => 0;
uint8_t buffer[256];
lfs_file_read(&lfs, &file, buffer, sizeof(buffer)) => 6;