mirror of
https://github.com/eledio-devices/thirdparty-littlefs.git
synced 2025-10-31 08:42:40 +01:00
c44427f9ec
As an embedded library, littlefs's configuration straddles two worlds.
In most cases the configuration is usually constant at build time, but
when integrated into OSs, the configuration needs to be dynamically
configurable.
To help with this, littlefs has a separate lfs_config struct that can be
placed into ROM when possible.
But you know what's better than ROM configuration? Truely inlinable
static configuration known at compile-time. In addition to avoiding the
RAM cost, compile-time configuration allows for additional compiler
optimizations, such as constexpr-elimination and removal of unused
code-paths.
So how to enable static configuration?
1. define LFS_STATICCFG
2. implement callbacks as global functions:
- lfs_read
- lfs_prog
- lfs_erase
- lfs_sync
2. define the now-required constants that configure littlefs:
- LFS_READ_SIZE
- LFS_PROG_SIZE
- LFS_BLOCK_SIZE
- LFS_BLOCK_COUNT
- LFS_BLOCK_CYCLES
- LFS_CACHE_SIZE
- LFS_LOOKAHEAD_SIZE
- LFS_READ_BUFFER (optional)
- LFS_PROG_BUFFER (optional)
- LFS_LOOKAHEAD_BUFFER (optional)
- LFS_NAME_MAX (optional)
- LFS_FILE_MAX (optional)
- LFS_ATTR_MAX (optional)
Note, there is a separate configuration for the file configuration, this
can be enabled/disabled independently of LFS_STATICCFG. You will likely
want to define this as well if you are looking for the smallest code
size.
In order to avoid a mess of #ifdefs, the internals of littlefs use a
simple macro that redirects to either the dynamic or static config at
compile time:
#ifdef LFS_STATICCFG
#define LFS_CFG_READ_SIZE(lfs) ((void)lfs, LFS_READ_SIZE)
#else
#define LFS_CFG_READ_SIZE(lfs) lfs->cfg->read_size
#endif
Unfortunately it does look like there still may be a lot of issues
related to warnings of comparisons against constants... If only C had
a way to ignore warnings on individual statements...
Original idea by apmorton
487 lines
16 KiB
TOML
487 lines
16 KiB
TOML
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[[case]] # simple file test
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code = '''
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lfs_formatcfg(&lfs, &cfg) => 0;
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lfs_mountcfg(&lfs, &cfg) => 0;
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lfs_file_open(&lfs, &file, "hello",
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LFS_O_WRONLY | LFS_O_CREAT | LFS_O_EXCL) => 0;
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size = strlen("Hello World!")+1;
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strcpy((char*)buffer, "Hello World!");
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lfs_file_write(&lfs, &file, buffer, size) => size;
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lfs_file_close(&lfs, &file) => 0;
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lfs_unmount(&lfs) => 0;
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lfs_mountcfg(&lfs, &cfg) => 0;
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lfs_file_open(&lfs, &file, "hello", LFS_O_RDONLY) => 0;
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lfs_file_read(&lfs, &file, buffer, size) => size;
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assert(strcmp((char*)buffer, "Hello World!") == 0);
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lfs_file_close(&lfs, &file) => 0;
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lfs_unmount(&lfs) => 0;
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'''
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[[case]] # larger files
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define.SIZE = [32, 8192, 262144, 0, 7, 8193]
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define.CHUNKSIZE = [31, 16, 33, 1, 1023]
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code = '''
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lfs_formatcfg(&lfs, &cfg) => 0;
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// write
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lfs_mountcfg(&lfs, &cfg) => 0;
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lfs_file_open(&lfs, &file, "avacado",
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LFS_O_WRONLY | LFS_O_CREAT | LFS_O_EXCL) => 0;
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srand(1);
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for (lfs_size_t i = 0; i < SIZE; i += CHUNKSIZE) {
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lfs_size_t chunk = lfs_min(CHUNKSIZE, SIZE-i);
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for (lfs_size_t b = 0; b < chunk; b++) {
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buffer[b] = rand() & 0xff;
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}
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lfs_file_write(&lfs, &file, buffer, chunk) => chunk;
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}
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lfs_file_close(&lfs, &file) => 0;
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lfs_unmount(&lfs) => 0;
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// read
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lfs_mountcfg(&lfs, &cfg) => 0;
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lfs_file_open(&lfs, &file, "avacado", LFS_O_RDONLY) => 0;
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lfs_file_size(&lfs, &file) => SIZE;
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srand(1);
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for (lfs_size_t i = 0; i < SIZE; i += CHUNKSIZE) {
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lfs_size_t chunk = lfs_min(CHUNKSIZE, SIZE-i);
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lfs_file_read(&lfs, &file, buffer, chunk) => chunk;
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for (lfs_size_t b = 0; b < chunk; b++) {
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assert(buffer[b] == (rand() & 0xff));
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}
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}
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lfs_file_read(&lfs, &file, buffer, CHUNKSIZE) => 0;
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lfs_file_close(&lfs, &file) => 0;
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lfs_unmount(&lfs) => 0;
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'''
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[[case]] # rewriting files
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define.SIZE1 = [32, 8192, 131072, 0, 7, 8193]
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define.SIZE2 = [32, 8192, 131072, 0, 7, 8193]
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define.CHUNKSIZE = [31, 16, 1]
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code = '''
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lfs_formatcfg(&lfs, &cfg) => 0;
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// write
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lfs_mountcfg(&lfs, &cfg) => 0;
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lfs_file_open(&lfs, &file, "avacado",
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LFS_O_WRONLY | LFS_O_CREAT | LFS_O_EXCL) => 0;
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srand(1);
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for (lfs_size_t i = 0; i < SIZE1; i += CHUNKSIZE) {
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lfs_size_t chunk = lfs_min(CHUNKSIZE, SIZE1-i);
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for (lfs_size_t b = 0; b < chunk; b++) {
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buffer[b] = rand() & 0xff;
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}
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lfs_file_write(&lfs, &file, buffer, chunk) => chunk;
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}
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lfs_file_close(&lfs, &file) => 0;
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lfs_unmount(&lfs) => 0;
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// read
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lfs_mountcfg(&lfs, &cfg) => 0;
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lfs_file_open(&lfs, &file, "avacado", LFS_O_RDONLY) => 0;
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lfs_file_size(&lfs, &file) => SIZE1;
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srand(1);
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for (lfs_size_t i = 0; i < SIZE1; i += CHUNKSIZE) {
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lfs_size_t chunk = lfs_min(CHUNKSIZE, SIZE1-i);
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lfs_file_read(&lfs, &file, buffer, chunk) => chunk;
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for (lfs_size_t b = 0; b < chunk; b++) {
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assert(buffer[b] == (rand() & 0xff));
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}
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}
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lfs_file_read(&lfs, &file, buffer, CHUNKSIZE) => 0;
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lfs_file_close(&lfs, &file) => 0;
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lfs_unmount(&lfs) => 0;
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// rewrite
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lfs_mountcfg(&lfs, &cfg) => 0;
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lfs_file_open(&lfs, &file, "avacado", LFS_O_WRONLY) => 0;
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srand(2);
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for (lfs_size_t i = 0; i < SIZE2; i += CHUNKSIZE) {
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lfs_size_t chunk = lfs_min(CHUNKSIZE, SIZE2-i);
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for (lfs_size_t b = 0; b < chunk; b++) {
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buffer[b] = rand() & 0xff;
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}
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lfs_file_write(&lfs, &file, buffer, chunk) => chunk;
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}
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lfs_file_close(&lfs, &file) => 0;
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lfs_unmount(&lfs) => 0;
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// read
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lfs_mountcfg(&lfs, &cfg) => 0;
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lfs_file_open(&lfs, &file, "avacado", LFS_O_RDONLY) => 0;
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lfs_file_size(&lfs, &file) => lfs_max(SIZE1, SIZE2);
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srand(2);
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for (lfs_size_t i = 0; i < SIZE2; i += CHUNKSIZE) {
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lfs_size_t chunk = lfs_min(CHUNKSIZE, SIZE2-i);
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lfs_file_read(&lfs, &file, buffer, chunk) => chunk;
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for (lfs_size_t b = 0; b < chunk; b++) {
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assert(buffer[b] == (rand() & 0xff));
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}
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}
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if (SIZE1 > SIZE2) {
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srand(1);
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for (lfs_size_t b = 0; b < SIZE2; b++) {
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rand();
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}
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for (lfs_size_t i = SIZE2; i < SIZE1; i += CHUNKSIZE) {
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lfs_size_t chunk = lfs_min(CHUNKSIZE, SIZE1-i);
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lfs_file_read(&lfs, &file, buffer, chunk) => chunk;
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for (lfs_size_t b = 0; b < chunk; b++) {
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assert(buffer[b] == (rand() & 0xff));
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}
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}
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}
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lfs_file_read(&lfs, &file, buffer, CHUNKSIZE) => 0;
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lfs_file_close(&lfs, &file) => 0;
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lfs_unmount(&lfs) => 0;
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'''
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[[case]] # appending files
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define.SIZE1 = [32, 8192, 131072, 0, 7, 8193]
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define.SIZE2 = [32, 8192, 131072, 0, 7, 8193]
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define.CHUNKSIZE = [31, 16, 1]
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code = '''
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lfs_formatcfg(&lfs, &cfg) => 0;
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// write
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lfs_mountcfg(&lfs, &cfg) => 0;
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lfs_file_open(&lfs, &file, "avacado",
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LFS_O_WRONLY | LFS_O_CREAT | LFS_O_EXCL) => 0;
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srand(1);
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for (lfs_size_t i = 0; i < SIZE1; i += CHUNKSIZE) {
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lfs_size_t chunk = lfs_min(CHUNKSIZE, SIZE1-i);
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for (lfs_size_t b = 0; b < chunk; b++) {
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buffer[b] = rand() & 0xff;
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}
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lfs_file_write(&lfs, &file, buffer, chunk) => chunk;
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}
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lfs_file_close(&lfs, &file) => 0;
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lfs_unmount(&lfs) => 0;
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// read
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lfs_mountcfg(&lfs, &cfg) => 0;
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lfs_file_open(&lfs, &file, "avacado", LFS_O_RDONLY) => 0;
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lfs_file_size(&lfs, &file) => SIZE1;
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srand(1);
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for (lfs_size_t i = 0; i < SIZE1; i += CHUNKSIZE) {
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lfs_size_t chunk = lfs_min(CHUNKSIZE, SIZE1-i);
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lfs_file_read(&lfs, &file, buffer, chunk) => chunk;
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for (lfs_size_t b = 0; b < chunk; b++) {
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assert(buffer[b] == (rand() & 0xff));
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}
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}
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lfs_file_read(&lfs, &file, buffer, CHUNKSIZE) => 0;
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lfs_file_close(&lfs, &file) => 0;
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lfs_unmount(&lfs) => 0;
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// append
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lfs_mountcfg(&lfs, &cfg) => 0;
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lfs_file_open(&lfs, &file, "avacado", LFS_O_WRONLY | LFS_O_APPEND) => 0;
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srand(2);
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for (lfs_size_t i = 0; i < SIZE2; i += CHUNKSIZE) {
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lfs_size_t chunk = lfs_min(CHUNKSIZE, SIZE2-i);
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for (lfs_size_t b = 0; b < chunk; b++) {
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buffer[b] = rand() & 0xff;
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}
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lfs_file_write(&lfs, &file, buffer, chunk) => chunk;
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}
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lfs_file_close(&lfs, &file) => 0;
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lfs_unmount(&lfs) => 0;
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// read
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lfs_mountcfg(&lfs, &cfg) => 0;
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lfs_file_open(&lfs, &file, "avacado", LFS_O_RDONLY) => 0;
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lfs_file_size(&lfs, &file) => SIZE1 + SIZE2;
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srand(1);
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for (lfs_size_t i = 0; i < SIZE1; i += CHUNKSIZE) {
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lfs_size_t chunk = lfs_min(CHUNKSIZE, SIZE1-i);
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lfs_file_read(&lfs, &file, buffer, chunk) => chunk;
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for (lfs_size_t b = 0; b < chunk; b++) {
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assert(buffer[b] == (rand() & 0xff));
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}
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}
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srand(2);
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for (lfs_size_t i = 0; i < SIZE2; i += CHUNKSIZE) {
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lfs_size_t chunk = lfs_min(CHUNKSIZE, SIZE2-i);
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lfs_file_read(&lfs, &file, buffer, chunk) => chunk;
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for (lfs_size_t b = 0; b < chunk; b++) {
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assert(buffer[b] == (rand() & 0xff));
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}
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}
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lfs_file_read(&lfs, &file, buffer, CHUNKSIZE) => 0;
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lfs_file_close(&lfs, &file) => 0;
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lfs_unmount(&lfs) => 0;
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'''
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[[case]] # truncating files
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define.SIZE1 = [32, 8192, 131072, 0, 7, 8193]
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define.SIZE2 = [32, 8192, 131072, 0, 7, 8193]
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define.CHUNKSIZE = [31, 16, 1]
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code = '''
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lfs_formatcfg(&lfs, &cfg) => 0;
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// write
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lfs_mountcfg(&lfs, &cfg) => 0;
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lfs_file_open(&lfs, &file, "avacado",
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LFS_O_WRONLY | LFS_O_CREAT | LFS_O_EXCL) => 0;
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srand(1);
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for (lfs_size_t i = 0; i < SIZE1; i += CHUNKSIZE) {
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lfs_size_t chunk = lfs_min(CHUNKSIZE, SIZE1-i);
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for (lfs_size_t b = 0; b < chunk; b++) {
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buffer[b] = rand() & 0xff;
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}
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lfs_file_write(&lfs, &file, buffer, chunk) => chunk;
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}
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lfs_file_close(&lfs, &file) => 0;
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lfs_unmount(&lfs) => 0;
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// read
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lfs_mountcfg(&lfs, &cfg) => 0;
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lfs_file_open(&lfs, &file, "avacado", LFS_O_RDONLY) => 0;
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lfs_file_size(&lfs, &file) => SIZE1;
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srand(1);
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for (lfs_size_t i = 0; i < SIZE1; i += CHUNKSIZE) {
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lfs_size_t chunk = lfs_min(CHUNKSIZE, SIZE1-i);
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lfs_file_read(&lfs, &file, buffer, chunk) => chunk;
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for (lfs_size_t b = 0; b < chunk; b++) {
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assert(buffer[b] == (rand() & 0xff));
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}
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}
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lfs_file_read(&lfs, &file, buffer, CHUNKSIZE) => 0;
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lfs_file_close(&lfs, &file) => 0;
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lfs_unmount(&lfs) => 0;
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// truncate
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lfs_mountcfg(&lfs, &cfg) => 0;
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lfs_file_open(&lfs, &file, "avacado", LFS_O_WRONLY | LFS_O_TRUNC) => 0;
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srand(2);
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for (lfs_size_t i = 0; i < SIZE2; i += CHUNKSIZE) {
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lfs_size_t chunk = lfs_min(CHUNKSIZE, SIZE2-i);
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for (lfs_size_t b = 0; b < chunk; b++) {
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buffer[b] = rand() & 0xff;
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}
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lfs_file_write(&lfs, &file, buffer, chunk) => chunk;
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}
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lfs_file_close(&lfs, &file) => 0;
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lfs_unmount(&lfs) => 0;
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// read
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lfs_mountcfg(&lfs, &cfg) => 0;
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lfs_file_open(&lfs, &file, "avacado", LFS_O_RDONLY) => 0;
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lfs_file_size(&lfs, &file) => SIZE2;
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srand(2);
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for (lfs_size_t i = 0; i < SIZE2; i += CHUNKSIZE) {
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lfs_size_t chunk = lfs_min(CHUNKSIZE, SIZE2-i);
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lfs_file_read(&lfs, &file, buffer, chunk) => chunk;
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for (lfs_size_t b = 0; b < chunk; b++) {
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assert(buffer[b] == (rand() & 0xff));
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}
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}
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lfs_file_read(&lfs, &file, buffer, CHUNKSIZE) => 0;
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lfs_file_close(&lfs, &file) => 0;
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lfs_unmount(&lfs) => 0;
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'''
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[[case]] # reentrant file writing
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define.SIZE = [32, 0, 7, 2049]
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define.CHUNKSIZE = [31, 16, 65]
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reentrant = true
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code = '''
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err = lfs_mountcfg(&lfs, &cfg);
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if (err) {
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lfs_formatcfg(&lfs, &cfg) => 0;
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lfs_mountcfg(&lfs, &cfg) => 0;
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}
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err = lfs_file_open(&lfs, &file, "avacado", LFS_O_RDONLY);
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assert(err == LFS_ERR_NOENT || err == 0);
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if (err == 0) {
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// can only be 0 (new file) or full size
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size = lfs_file_size(&lfs, &file);
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assert(size == 0 || size == SIZE);
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lfs_file_close(&lfs, &file) => 0;
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}
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// write
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lfs_file_open(&lfs, &file, "avacado", LFS_O_WRONLY | LFS_O_CREAT) => 0;
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srand(1);
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for (lfs_size_t i = 0; i < SIZE; i += CHUNKSIZE) {
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lfs_size_t chunk = lfs_min(CHUNKSIZE, SIZE-i);
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for (lfs_size_t b = 0; b < chunk; b++) {
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buffer[b] = rand() & 0xff;
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}
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lfs_file_write(&lfs, &file, buffer, chunk) => chunk;
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}
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lfs_file_close(&lfs, &file) => 0;
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// read
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lfs_file_open(&lfs, &file, "avacado", LFS_O_RDONLY) => 0;
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lfs_file_size(&lfs, &file) => SIZE;
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srand(1);
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for (lfs_size_t i = 0; i < SIZE; i += CHUNKSIZE) {
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lfs_size_t chunk = lfs_min(CHUNKSIZE, SIZE-i);
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lfs_file_read(&lfs, &file, buffer, chunk) => chunk;
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for (lfs_size_t b = 0; b < chunk; b++) {
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assert(buffer[b] == (rand() & 0xff));
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}
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}
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lfs_file_read(&lfs, &file, buffer, CHUNKSIZE) => 0;
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lfs_file_close(&lfs, &file) => 0;
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lfs_unmount(&lfs) => 0;
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'''
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[[case]] # reentrant file writing with syncs
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define = [
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# append (O(n))
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{MODE='LFS_O_APPEND', SIZE=[32, 0, 7, 2049], CHUNKSIZE=[31, 16, 65]},
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# truncate (O(n^2))
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{MODE='LFS_O_TRUNC', SIZE=[32, 0, 7, 200], CHUNKSIZE=[31, 16, 65]},
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# rewrite (O(n^2))
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{MODE=0, SIZE=[32, 0, 7, 200], CHUNKSIZE=[31, 16, 65]},
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]
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reentrant = true
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code = '''
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err = lfs_mountcfg(&lfs, &cfg);
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if (err) {
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lfs_formatcfg(&lfs, &cfg) => 0;
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lfs_mountcfg(&lfs, &cfg) => 0;
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}
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err = lfs_file_open(&lfs, &file, "avacado", LFS_O_RDONLY);
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assert(err == LFS_ERR_NOENT || err == 0);
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if (err == 0) {
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// with syncs we could be any size, but it at least must be valid data
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size = lfs_file_size(&lfs, &file);
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assert(size <= SIZE);
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srand(1);
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for (lfs_size_t i = 0; i < size; i += CHUNKSIZE) {
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lfs_size_t chunk = lfs_min(CHUNKSIZE, size-i);
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lfs_file_read(&lfs, &file, buffer, chunk) => chunk;
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for (lfs_size_t b = 0; b < chunk; b++) {
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assert(buffer[b] == (rand() & 0xff));
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}
|
|
}
|
|
lfs_file_close(&lfs, &file) => 0;
|
|
}
|
|
|
|
// write
|
|
lfs_file_open(&lfs, &file, "avacado",
|
|
LFS_O_WRONLY | LFS_O_CREAT | MODE) => 0;
|
|
size = lfs_file_size(&lfs, &file);
|
|
assert(size <= SIZE);
|
|
srand(1);
|
|
lfs_size_t skip = (MODE == LFS_O_APPEND) ? size : 0;
|
|
for (lfs_size_t b = 0; b < skip; b++) {
|
|
rand();
|
|
}
|
|
for (lfs_size_t i = skip; i < SIZE; i += CHUNKSIZE) {
|
|
lfs_size_t chunk = lfs_min(CHUNKSIZE, SIZE-i);
|
|
for (lfs_size_t b = 0; b < chunk; b++) {
|
|
buffer[b] = rand() & 0xff;
|
|
}
|
|
lfs_file_write(&lfs, &file, buffer, chunk) => chunk;
|
|
lfs_file_sync(&lfs, &file) => 0;
|
|
}
|
|
lfs_file_close(&lfs, &file) => 0;
|
|
|
|
// read
|
|
lfs_file_open(&lfs, &file, "avacado", LFS_O_RDONLY) => 0;
|
|
lfs_file_size(&lfs, &file) => SIZE;
|
|
srand(1);
|
|
for (lfs_size_t i = 0; i < SIZE; i += CHUNKSIZE) {
|
|
lfs_size_t chunk = lfs_min(CHUNKSIZE, SIZE-i);
|
|
lfs_file_read(&lfs, &file, buffer, chunk) => chunk;
|
|
for (lfs_size_t b = 0; b < chunk; b++) {
|
|
assert(buffer[b] == (rand() & 0xff));
|
|
}
|
|
}
|
|
lfs_file_read(&lfs, &file, buffer, CHUNKSIZE) => 0;
|
|
lfs_file_close(&lfs, &file) => 0;
|
|
lfs_unmount(&lfs) => 0;
|
|
'''
|
|
|
|
[[case]] # many files
|
|
define.N = 300
|
|
code = '''
|
|
lfs_formatcfg(&lfs, &cfg) => 0;
|
|
// create N files of 7 bytes
|
|
lfs_mountcfg(&lfs, &cfg) => 0;
|
|
for (int i = 0; i < N; i++) {
|
|
sprintf(path, "file_%03d", i);
|
|
lfs_file_open(&lfs, &file, path,
|
|
LFS_O_WRONLY | LFS_O_CREAT | LFS_O_EXCL) => 0;
|
|
char wbuffer[1024];
|
|
size = 7;
|
|
snprintf(wbuffer, size, "Hi %03d", i);
|
|
lfs_file_write(&lfs, &file, wbuffer, size) => size;
|
|
lfs_file_close(&lfs, &file) => 0;
|
|
|
|
char rbuffer[1024];
|
|
lfs_file_open(&lfs, &file, path, LFS_O_RDONLY) => 0;
|
|
lfs_file_read(&lfs, &file, rbuffer, size) => size;
|
|
assert(strcmp(rbuffer, wbuffer) == 0);
|
|
lfs_file_close(&lfs, &file) => 0;
|
|
}
|
|
lfs_unmount(&lfs) => 0;
|
|
'''
|
|
|
|
[[case]] # many files with power cycle
|
|
define.N = 300
|
|
code = '''
|
|
lfs_formatcfg(&lfs, &cfg) => 0;
|
|
// create N files of 7 bytes
|
|
lfs_mountcfg(&lfs, &cfg) => 0;
|
|
for (int i = 0; i < N; i++) {
|
|
sprintf(path, "file_%03d", i);
|
|
lfs_file_open(&lfs, &file, path,
|
|
LFS_O_WRONLY | LFS_O_CREAT | LFS_O_EXCL) => 0;
|
|
char wbuffer[1024];
|
|
size = 7;
|
|
snprintf(wbuffer, size, "Hi %03d", i);
|
|
lfs_file_write(&lfs, &file, wbuffer, size) => size;
|
|
lfs_file_close(&lfs, &file) => 0;
|
|
lfs_unmount(&lfs) => 0;
|
|
|
|
char rbuffer[1024];
|
|
lfs_mountcfg(&lfs, &cfg) => 0;
|
|
lfs_file_open(&lfs, &file, path, LFS_O_RDONLY) => 0;
|
|
lfs_file_read(&lfs, &file, rbuffer, size) => size;
|
|
assert(strcmp(rbuffer, wbuffer) == 0);
|
|
lfs_file_close(&lfs, &file) => 0;
|
|
}
|
|
lfs_unmount(&lfs) => 0;
|
|
'''
|
|
|
|
[[case]] # many files with power loss
|
|
define.N = 300
|
|
reentrant = true
|
|
code = '''
|
|
err = lfs_mountcfg(&lfs, &cfg);
|
|
if (err) {
|
|
lfs_formatcfg(&lfs, &cfg) => 0;
|
|
lfs_mountcfg(&lfs, &cfg) => 0;
|
|
}
|
|
// create N files of 7 bytes
|
|
for (int i = 0; i < N; i++) {
|
|
sprintf(path, "file_%03d", i);
|
|
err = lfs_file_open(&lfs, &file, path, LFS_O_WRONLY | LFS_O_CREAT);
|
|
char wbuffer[1024];
|
|
size = 7;
|
|
snprintf(wbuffer, size, "Hi %03d", i);
|
|
if ((lfs_size_t)lfs_file_size(&lfs, &file) != size) {
|
|
lfs_file_write(&lfs, &file, wbuffer, size) => size;
|
|
}
|
|
lfs_file_close(&lfs, &file) => 0;
|
|
|
|
char rbuffer[1024];
|
|
lfs_file_open(&lfs, &file, path, LFS_O_RDONLY) => 0;
|
|
lfs_file_read(&lfs, &file, rbuffer, size) => size;
|
|
assert(strcmp(rbuffer, wbuffer) == 0);
|
|
lfs_file_close(&lfs, &file) => 0;
|
|
}
|
|
lfs_unmount(&lfs) => 0;
|
|
'''
|