mirror of
https://github.com/eledio-devices/thirdparty-littlefs.git
synced 2025-10-31 08:42:40 +01:00
f42e007709
This is the start of reworking littlefs's testing framework based on
lessons learned from the initial testing framework.
1. The testing framework needs to be _flexible_. It was hacky, which by
itself isn't a downside, but it wasn't _flexible_. This limited what
could be done with the tests and there ended up being many
workarounds just to reproduce bugs.
The idea behind this revamped framework is to separate the
description of tests (tests/test_dirs.toml) and the running of tests
(scripts/test.py).
Now, with the logic moved entirely to python, it's possible to run
the test under varying environments. In addition to the "just don't
assert" run, I'm also looking to run the tests in valgrind for memory
checking, and an environment with simulated power-loss.
The test description can also contain abstract attributes that help
control how tests can be ran, such as "leaky" to identify tests where
memory leaks are expected. This keeps test limitations at a minimum
without limiting how the tests can be ran.
2. Multi-stage-process tests didn't really add value and limited what
the testing environment.
Unmounting + mounting can be done in a single process to test the
same logic. It would be really difficult to make this fail only
when memory is zeroed, though that can still be caught by
power-resilient tests.
Requiring every test to be a single process adds several options
for test execution, such as using a RAM-backed block device for
speed, or even running the tests on a device.
3. Added fancy assert interception. This wasn't really a requirement,
but something I've been wanting to experiment with for a while.
During testing, scripts/explode_asserts.py is added to the build
process. This is a custom C-preprocessor that parses out assert
statements and replaces them with _very_ verbose asserts that
wouldn't normally be possible with just C macros.
It even goes as far as to report the arguments to strcmp, since the
lack of visibility here was very annoying.
tests_/test_dirs.toml:186:assert: assert failed with "..", expected eq "..."
assert(strcmp(info.name, "...") == 0);
One downside is that simply parsing C in python is slower than the
entire rest of the compilation, but fortunately this can be
alleviated by parallelizing the test builds through make.
Other neat bits:
- All generated files are a suffix of the test description, this helps
cleanup and means it's (theoretically) possible to parallelize the
tests.
- The generated test.c is shoved base64 into an ad-hoc Makefile, this
means it doesn't force a rebuild of tests all the time.
- Test parameterizing is now easier.
- Hopefully this framework can be repurposed also for benchmarks in the
future.
415 lines
11 KiB
C
415 lines
11 KiB
C
/*
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* Block device emulated on standard files
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*
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* Copyright (c) 2017, Arm Limited. All rights reserved.
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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#include "emubd/lfs_emubd.h"
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#include <errno.h>
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#include <string.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <limits.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include <assert.h>
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#include <stdbool.h>
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#include <inttypes.h>
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// Emulated block device utils
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static inline void lfs_emubd_tole32(lfs_emubd_t *emu) {
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emu->cfg.read_size = lfs_tole32(emu->cfg.read_size);
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emu->cfg.prog_size = lfs_tole32(emu->cfg.prog_size);
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emu->cfg.block_size = lfs_tole32(emu->cfg.block_size);
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emu->cfg.block_count = lfs_tole32(emu->cfg.block_count);
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emu->stats.read_count = lfs_tole32(emu->stats.read_count);
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emu->stats.prog_count = lfs_tole32(emu->stats.prog_count);
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emu->stats.erase_count = lfs_tole32(emu->stats.erase_count);
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for (unsigned i = 0; i < sizeof(emu->history.blocks) /
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sizeof(emu->history.blocks[0]); i++) {
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emu->history.blocks[i] = lfs_tole32(emu->history.blocks[i]);
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}
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}
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static inline void lfs_emubd_fromle32(lfs_emubd_t *emu) {
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emu->cfg.read_size = lfs_fromle32(emu->cfg.read_size);
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emu->cfg.prog_size = lfs_fromle32(emu->cfg.prog_size);
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emu->cfg.block_size = lfs_fromle32(emu->cfg.block_size);
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emu->cfg.block_count = lfs_fromle32(emu->cfg.block_count);
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emu->stats.read_count = lfs_fromle32(emu->stats.read_count);
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emu->stats.prog_count = lfs_fromle32(emu->stats.prog_count);
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emu->stats.erase_count = lfs_fromle32(emu->stats.erase_count);
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for (unsigned i = 0; i < sizeof(emu->history.blocks) /
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sizeof(emu->history.blocks[0]); i++) {
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emu->history.blocks[i] = lfs_fromle32(emu->history.blocks[i]);
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}
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}
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// Block device emulated on existing filesystem
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int lfs_emubd_create(const struct lfs_config *cfg, const char *path) {
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LFS_TRACE("lfs_emubd_create(%p {.context=%p, "
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".read=%p, .prog=%p, .erase=%p, .sync=%p, "
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".read_size=%"PRIu32", .prog_size=%"PRIu32", "
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".block_size=%"PRIu32", .block_count=%"PRIu32"}, \"%s\")",
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(void*)cfg, cfg->context,
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(void*)(uintptr_t)cfg->read, (void*)(uintptr_t)cfg->prog,
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(void*)(uintptr_t)cfg->erase, (void*)(uintptr_t)cfg->sync,
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cfg->read_size, cfg->prog_size, cfg->block_size, cfg->block_count,
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path);
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lfs_emubd_t *emu = cfg->context;
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emu->cfg.read_size = cfg->read_size;
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emu->cfg.prog_size = cfg->prog_size;
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emu->cfg.block_size = cfg->block_size;
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emu->cfg.block_count = cfg->block_count;
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// Allocate buffer for creating children files
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size_t pathlen = strlen(path);
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emu->path = malloc(pathlen + 1 + LFS_NAME_MAX + 1);
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if (!emu->path) {
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int err = -ENOMEM;
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LFS_TRACE("lfs_emubd_create -> %"PRId32, err);
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return err;
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}
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strcpy(emu->path, path);
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emu->path[pathlen] = '/';
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emu->child = &emu->path[pathlen+1];
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memset(emu->child, '\0', LFS_NAME_MAX+1);
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// Create directory if it doesn't exist
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int err = mkdir(path, 0777);
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if (err && errno != EEXIST) {
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err = -errno;
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LFS_TRACE("lfs_emubd_create -> %"PRId32, err);
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return err;
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}
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// Load stats to continue incrementing
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snprintf(emu->child, LFS_NAME_MAX, ".stats");
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FILE *f = fopen(emu->path, "r");
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if (!f) {
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memset(&emu->stats, LFS_EMUBD_ERASE_VALUE, sizeof(emu->stats));
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} else {
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size_t res = fread(&emu->stats, sizeof(emu->stats), 1, f);
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lfs_emubd_fromle32(emu);
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if (res < 1) {
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err = -errno;
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LFS_TRACE("lfs_emubd_create -> %"PRId32, err);
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fclose(f);
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return err;
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}
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err = fclose(f);
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if (err) {
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err = -errno;
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LFS_TRACE("lfs_emubd_create -> %"PRId32, err);
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return err;
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}
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}
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// Load history
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snprintf(emu->child, LFS_NAME_MAX, ".history");
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f = fopen(emu->path, "r");
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if (!f) {
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memset(&emu->history, 0, sizeof(emu->history));
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} else {
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size_t res = fread(&emu->history, sizeof(emu->history), 1, f);
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lfs_emubd_fromle32(emu);
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if (res < 1) {
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err = -errno;
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LFS_TRACE("lfs_emubd_create -> %"PRId32, err);
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fclose(f);
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return err;
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}
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err = fclose(f);
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if (err) {
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err = -errno;
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LFS_TRACE("lfs_emubd_create -> %"PRId32, err);
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return err;
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}
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}
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LFS_TRACE("lfs_emubd_create -> %"PRId32, 0);
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return 0;
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}
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void lfs_emubd_destroy(const struct lfs_config *cfg) {
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LFS_TRACE("lfs_emubd_destroy(%p)", (void*)cfg);
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lfs_emubd_sync(cfg);
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lfs_emubd_t *emu = cfg->context;
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free(emu->path);
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LFS_TRACE("lfs_emubd_destroy -> %s", "void");
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}
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int lfs_emubd_read(const struct lfs_config *cfg, lfs_block_t block,
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lfs_off_t off, void *buffer, lfs_size_t size) {
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LFS_TRACE("lfs_emubd_read(%p, 0x%"PRIx32", %"PRIu32", %p, %"PRIu32")",
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(void*)cfg, block, off, buffer, size);
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lfs_emubd_t *emu = cfg->context;
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uint8_t *data = buffer;
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// Check if read is valid
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LFS_ASSERT(off % cfg->read_size == 0);
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LFS_ASSERT(size % cfg->read_size == 0);
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LFS_ASSERT(block < cfg->block_count);
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// Zero out buffer for debugging
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memset(data, 0, size);
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// Read data
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snprintf(emu->child, LFS_NAME_MAX, "%" PRIx32, block);
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FILE *f = fopen(emu->path, "rb");
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if (!f && errno != ENOENT) {
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int err = -errno;
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LFS_TRACE("lfs_emubd_read -> %d", err);
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return err;
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}
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if (f) {
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int err = fseek(f, off, SEEK_SET);
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if (err) {
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err = -errno;
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LFS_TRACE("lfs_emubd_read -> %d", err);
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fclose(f);
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return err;
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}
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size_t res = fread(data, 1, size, f);
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if (res < size && !feof(f)) {
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err = -errno;
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LFS_TRACE("lfs_emubd_read -> %d", err);
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fclose(f);
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return err;
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}
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err = fclose(f);
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if (err) {
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err = -errno;
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LFS_TRACE("lfs_emubd_read -> %d", err);
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return err;
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}
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}
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emu->stats.read_count += size;
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LFS_TRACE("lfs_emubd_read -> %d", 0);
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return 0;
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}
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int lfs_emubd_prog(const struct lfs_config *cfg, lfs_block_t block,
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lfs_off_t off, const void *buffer, lfs_size_t size) {
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LFS_TRACE("lfs_emubd_prog(%p, 0x%"PRIx32", %"PRIu32", %p, %"PRIu32")",
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(void*)cfg, block, off, buffer, size);
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lfs_emubd_t *emu = cfg->context;
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const uint8_t *data = buffer;
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// Check if write is valid
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LFS_ASSERT(off % cfg->prog_size == 0);
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LFS_ASSERT(size % cfg->prog_size == 0);
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LFS_ASSERT(block < cfg->block_count);
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// Program data
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snprintf(emu->child, LFS_NAME_MAX, "%" PRIx32, block);
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FILE *f = fopen(emu->path, "r+b");
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if (!f) {
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int err = (errno == EACCES) ? 0 : -errno;
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LFS_TRACE("lfs_emubd_prog -> %d", err);
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return err;
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}
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// Check that file was erased
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LFS_ASSERT(f);
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int err = fseek(f, off, SEEK_SET);
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if (err) {
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err = -errno;
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LFS_TRACE("lfs_emubd_prog -> %d", err);
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fclose(f);
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return err;
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}
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size_t res = fwrite(data, 1, size, f);
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if (res < size) {
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err = -errno;
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LFS_TRACE("lfs_emubd_prog -> %d", err);
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fclose(f);
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return err;
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}
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err = fseek(f, off, SEEK_SET);
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if (err) {
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err = -errno;
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LFS_TRACE("lfs_emubd_prog -> %d", err);
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fclose(f);
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return err;
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}
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uint8_t dat;
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res = fread(&dat, 1, 1, f);
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if (res < 1) {
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err = -errno;
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LFS_TRACE("lfs_emubd_prog -> %d", err);
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fclose(f);
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return err;
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}
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err = fclose(f);
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if (err) {
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err = -errno;
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LFS_TRACE("lfs_emubd_prog -> %d", err);
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return err;
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}
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// update history and stats
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if (block != emu->history.blocks[0]) {
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memmove(&emu->history.blocks[1], &emu->history.blocks[0],
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sizeof(emu->history) - sizeof(emu->history.blocks[0]));
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emu->history.blocks[0] = block;
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}
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emu->stats.prog_count += size;
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LFS_TRACE("lfs_emubd_prog -> %d", 0);
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return 0;
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}
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int lfs_emubd_erase(const struct lfs_config *cfg, lfs_block_t block) {
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LFS_TRACE("lfs_emubd_erase(%p, 0x%"PRIx32")", (void*)cfg, block);
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lfs_emubd_t *emu = cfg->context;
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// Check if erase is valid
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LFS_ASSERT(block < cfg->block_count);
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// Erase the block
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snprintf(emu->child, LFS_NAME_MAX, "%" PRIx32, block);
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struct stat st;
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int err = stat(emu->path, &st);
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if (err && errno != ENOENT) {
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err = -errno;
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LFS_TRACE("lfs_emubd_erase -> %d", err);
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return err;
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}
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if (!err && S_ISREG(st.st_mode) && (S_IWUSR & st.st_mode)) {
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err = unlink(emu->path);
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if (err) {
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err = -errno;
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LFS_TRACE("lfs_emubd_erase -> %d", err);
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return err;
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}
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}
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if (err || (S_ISREG(st.st_mode) && (S_IWUSR & st.st_mode))) {
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FILE *f = fopen(emu->path, "w");
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if (!f) {
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err = -errno;
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LFS_TRACE("lfs_emubd_erase -> %d", err);
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return err;
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}
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err = fclose(f);
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if (err) {
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err = -errno;
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LFS_TRACE("lfs_emubd_erase -> %d", err);
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return err;
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}
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}
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emu->stats.erase_count += cfg->block_size;
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LFS_TRACE("lfs_emubd_erase -> %d", 0);
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return 0;
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}
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int lfs_emubd_sync(const struct lfs_config *cfg) {
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LFS_TRACE("lfs_emubd_sync(%p)", (void*)cfg);
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lfs_emubd_t *emu = cfg->context;
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// Just write out info/stats for later lookup
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snprintf(emu->child, LFS_NAME_MAX, ".config");
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FILE *f = fopen(emu->path, "w");
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if (!f) {
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int err = -errno;
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LFS_TRACE("lfs_emubd_sync -> %d", err);
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return err;
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}
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lfs_emubd_tole32(emu);
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size_t res = fwrite(&emu->cfg, sizeof(emu->cfg), 1, f);
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lfs_emubd_fromle32(emu);
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if (res < 1) {
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int err = -errno;
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LFS_TRACE("lfs_emubd_sync -> %d", err);
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fclose(f);
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return err;
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}
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int err = fclose(f);
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if (err) {
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err = -errno;
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LFS_TRACE("lfs_emubd_sync -> %d", err);
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return err;
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}
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snprintf(emu->child, LFS_NAME_MAX, ".stats");
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f = fopen(emu->path, "w");
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if (!f) {
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err = -errno;
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LFS_TRACE("lfs_emubd_sync -> %d", err);
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return err;
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}
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lfs_emubd_tole32(emu);
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res = fwrite(&emu->stats, sizeof(emu->stats), 1, f);
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lfs_emubd_fromle32(emu);
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if (res < 1) {
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err = -errno;
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LFS_TRACE("lfs_emubd_sync -> %d", err);
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fclose(f);
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return err;
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}
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err = fclose(f);
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if (err) {
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err = -errno;
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LFS_TRACE("lfs_emubd_sync -> %d", err);
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return err;
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}
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snprintf(emu->child, LFS_NAME_MAX, ".history");
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f = fopen(emu->path, "w");
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if (!f) {
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err = -errno;
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LFS_TRACE("lfs_emubd_sync -> %d", err);
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return err;
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}
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lfs_emubd_tole32(emu);
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res = fwrite(&emu->history, sizeof(emu->history), 1, f);
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lfs_emubd_fromle32(emu);
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if (res < 1) {
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err = -errno;
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LFS_TRACE("lfs_emubd_sync -> %d", err);
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fclose(f);
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return err;
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}
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err = fclose(f);
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if (err) {
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err = -errno;
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LFS_TRACE("lfs_emubd_sync -> %d", err);
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return err;
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}
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LFS_TRACE("lfs_emubd_sync -> %d", 0);
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return 0;
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}
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