mirror of
https://github.com/eledio-devices/thirdparty-littlefs.git
synced 2025-10-31 16:14:16 +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
381 lines
13 KiB
TOML
381 lines
13 KiB
TOML
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[[case]] # simple file seek
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define = [
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{COUNT=132, SKIP=4},
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{COUNT=132, SKIP=128},
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{COUNT=200, SKIP=10},
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{COUNT=200, SKIP=100},
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{COUNT=4, SKIP=1},
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{COUNT=4, SKIP=2},
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]
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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, "kitty",
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LFS_O_WRONLY | LFS_O_CREAT | LFS_O_APPEND) => 0;
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size = strlen("kittycatcat");
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memcpy(buffer, "kittycatcat", size);
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for (int j = 0; j < COUNT; j++) {
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lfs_file_write(&lfs, &file, buffer, size);
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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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lfs_mountcfg(&lfs, &cfg) => 0;
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lfs_file_open(&lfs, &file, "kitty", LFS_O_RDONLY) => 0;
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lfs_soff_t pos = -1;
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size = strlen("kittycatcat");
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for (int i = 0; i < SKIP; i++) {
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lfs_file_read(&lfs, &file, buffer, size) => size;
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memcmp(buffer, "kittycatcat", size) => 0;
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pos = lfs_file_tell(&lfs, &file);
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}
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assert(pos >= 0);
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lfs_file_seek(&lfs, &file, pos, LFS_SEEK_SET) => pos;
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lfs_file_read(&lfs, &file, buffer, size) => size;
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memcmp(buffer, "kittycatcat", size) => 0;
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lfs_file_rewind(&lfs, &file) => 0;
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lfs_file_read(&lfs, &file, buffer, size) => size;
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memcmp(buffer, "kittycatcat", size) => 0;
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lfs_file_seek(&lfs, &file, 0, LFS_SEEK_CUR) => size;
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lfs_file_read(&lfs, &file, buffer, size) => size;
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memcmp(buffer, "kittycatcat", size) => 0;
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lfs_file_seek(&lfs, &file, size, LFS_SEEK_CUR) => 3*size;
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lfs_file_read(&lfs, &file, buffer, size) => size;
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memcmp(buffer, "kittycatcat", size) => 0;
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lfs_file_seek(&lfs, &file, pos, LFS_SEEK_SET) => pos;
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lfs_file_read(&lfs, &file, buffer, size) => size;
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memcmp(buffer, "kittycatcat", size) => 0;
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lfs_file_seek(&lfs, &file, -size, LFS_SEEK_CUR) => pos;
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lfs_file_read(&lfs, &file, buffer, size) => size;
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memcmp(buffer, "kittycatcat", size) => 0;
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lfs_file_seek(&lfs, &file, -size, LFS_SEEK_END) >= 0 => 1;
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lfs_file_read(&lfs, &file, buffer, size) => size;
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memcmp(buffer, "kittycatcat", size) => 0;
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size = lfs_file_size(&lfs, &file);
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lfs_file_seek(&lfs, &file, 0, LFS_SEEK_CUR) => size;
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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]] # simple file seek and write
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define = [
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{COUNT=132, SKIP=4},
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{COUNT=132, SKIP=128},
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{COUNT=200, SKIP=10},
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{COUNT=200, SKIP=100},
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{COUNT=4, SKIP=1},
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{COUNT=4, SKIP=2},
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]
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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, "kitty",
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LFS_O_WRONLY | LFS_O_CREAT | LFS_O_APPEND) => 0;
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size = strlen("kittycatcat");
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memcpy(buffer, "kittycatcat", size);
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for (int j = 0; j < COUNT; j++) {
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lfs_file_write(&lfs, &file, buffer, size);
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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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lfs_mountcfg(&lfs, &cfg) => 0;
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lfs_file_open(&lfs, &file, "kitty", LFS_O_RDWR) => 0;
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lfs_soff_t pos = -1;
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size = strlen("kittycatcat");
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for (int i = 0; i < SKIP; i++) {
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lfs_file_read(&lfs, &file, buffer, size) => size;
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memcmp(buffer, "kittycatcat", size) => 0;
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pos = lfs_file_tell(&lfs, &file);
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}
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assert(pos >= 0);
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memcpy(buffer, "doggodogdog", size);
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lfs_file_seek(&lfs, &file, pos, LFS_SEEK_SET) => pos;
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lfs_file_write(&lfs, &file, buffer, size) => size;
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lfs_file_seek(&lfs, &file, pos, LFS_SEEK_SET) => pos;
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lfs_file_read(&lfs, &file, buffer, size) => size;
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memcmp(buffer, "doggodogdog", size) => 0;
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lfs_file_rewind(&lfs, &file) => 0;
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lfs_file_read(&lfs, &file, buffer, size) => size;
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memcmp(buffer, "kittycatcat", size) => 0;
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lfs_file_seek(&lfs, &file, pos, LFS_SEEK_SET) => pos;
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lfs_file_read(&lfs, &file, buffer, size) => size;
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memcmp(buffer, "doggodogdog", size) => 0;
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lfs_file_seek(&lfs, &file, -size, LFS_SEEK_END) >= 0 => 1;
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lfs_file_read(&lfs, &file, buffer, size) => size;
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memcmp(buffer, "kittycatcat", size) => 0;
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size = lfs_file_size(&lfs, &file);
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lfs_file_seek(&lfs, &file, 0, LFS_SEEK_CUR) => size;
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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]] # boundary seek and writes
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define.COUNT = 132
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define.OFFSETS = '"{512, 1020, 513, 1021, 511, 1019, 1441}"'
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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, "kitty",
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LFS_O_WRONLY | LFS_O_CREAT | LFS_O_APPEND) => 0;
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size = strlen("kittycatcat");
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memcpy(buffer, "kittycatcat", size);
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for (int j = 0; j < COUNT; j++) {
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lfs_file_write(&lfs, &file, buffer, size);
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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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lfs_mountcfg(&lfs, &cfg) => 0;
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lfs_file_open(&lfs, &file, "kitty", LFS_O_RDWR) => 0;
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size = strlen("hedgehoghog");
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const lfs_soff_t offsets[] = OFFSETS;
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for (unsigned i = 0; i < sizeof(offsets) / sizeof(offsets[0]); i++) {
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lfs_soff_t off = offsets[i];
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memcpy(buffer, "hedgehoghog", size);
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lfs_file_seek(&lfs, &file, off, LFS_SEEK_SET) => off;
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lfs_file_write(&lfs, &file, buffer, size) => size;
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lfs_file_seek(&lfs, &file, off, LFS_SEEK_SET) => off;
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lfs_file_read(&lfs, &file, buffer, size) => size;
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memcmp(buffer, "hedgehoghog", size) => 0;
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lfs_file_seek(&lfs, &file, 0, LFS_SEEK_SET) => 0;
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lfs_file_read(&lfs, &file, buffer, size) => size;
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memcmp(buffer, "kittycatcat", size) => 0;
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lfs_file_seek(&lfs, &file, off, LFS_SEEK_SET) => off;
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lfs_file_read(&lfs, &file, buffer, size) => size;
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memcmp(buffer, "hedgehoghog", size) => 0;
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lfs_file_sync(&lfs, &file) => 0;
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lfs_file_seek(&lfs, &file, 0, LFS_SEEK_SET) => 0;
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lfs_file_read(&lfs, &file, buffer, size) => size;
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memcmp(buffer, "kittycatcat", size) => 0;
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lfs_file_seek(&lfs, &file, off, LFS_SEEK_SET) => off;
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lfs_file_read(&lfs, &file, buffer, size) => size;
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memcmp(buffer, "hedgehoghog", size) => 0;
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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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'''
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[[case]] # out of bounds seek
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define = [
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{COUNT=132, SKIP=4},
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{COUNT=132, SKIP=128},
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{COUNT=200, SKIP=10},
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{COUNT=200, SKIP=100},
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{COUNT=4, SKIP=2},
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{COUNT=4, SKIP=3},
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]
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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, "kitty",
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LFS_O_WRONLY | LFS_O_CREAT | LFS_O_APPEND) => 0;
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size = strlen("kittycatcat");
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memcpy(buffer, "kittycatcat", size);
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for (int j = 0; j < COUNT; j++) {
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lfs_file_write(&lfs, &file, buffer, size);
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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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lfs_mountcfg(&lfs, &cfg) => 0;
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lfs_file_open(&lfs, &file, "kitty", LFS_O_RDWR) => 0;
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size = strlen("kittycatcat");
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lfs_file_size(&lfs, &file) => COUNT*size;
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lfs_file_seek(&lfs, &file, (COUNT+SKIP)*size,
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LFS_SEEK_SET) => (COUNT+SKIP)*size;
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lfs_file_read(&lfs, &file, buffer, size) => 0;
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memcpy(buffer, "porcupineee", size);
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lfs_file_write(&lfs, &file, buffer, size) => size;
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lfs_file_seek(&lfs, &file, (COUNT+SKIP)*size,
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LFS_SEEK_SET) => (COUNT+SKIP)*size;
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lfs_file_read(&lfs, &file, buffer, size) => size;
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memcmp(buffer, "porcupineee", size) => 0;
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lfs_file_seek(&lfs, &file, COUNT*size,
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LFS_SEEK_SET) => COUNT*size;
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lfs_file_read(&lfs, &file, buffer, size) => size;
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memcmp(buffer, "\0\0\0\0\0\0\0\0\0\0\0", size) => 0;
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lfs_file_seek(&lfs, &file, -((COUNT+SKIP)*size),
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LFS_SEEK_CUR) => LFS_ERR_INVAL;
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lfs_file_tell(&lfs, &file) => (COUNT+1)*size;
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lfs_file_seek(&lfs, &file, -((COUNT+2*SKIP)*size),
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LFS_SEEK_END) => LFS_ERR_INVAL;
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lfs_file_tell(&lfs, &file) => (COUNT+1)*size;
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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]] # inline write and seek
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define.SIZE = [2, 4, 128, 132]
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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, "tinykitty",
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LFS_O_RDWR | LFS_O_CREAT) => 0;
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int j = 0;
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int k = 0;
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memcpy(buffer, "abcdefghijklmnopqrstuvwxyz", 26);
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for (unsigned i = 0; i < SIZE; i++) {
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lfs_file_write(&lfs, &file, &buffer[j++ % 26], 1) => 1;
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lfs_file_tell(&lfs, &file) => i+1;
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lfs_file_size(&lfs, &file) => i+1;
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}
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lfs_file_seek(&lfs, &file, 0, LFS_SEEK_SET) => 0;
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lfs_file_tell(&lfs, &file) => 0;
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lfs_file_size(&lfs, &file) => SIZE;
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for (unsigned i = 0; i < SIZE; i++) {
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uint8_t c;
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lfs_file_read(&lfs, &file, &c, 1) => 1;
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c => buffer[k++ % 26];
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}
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lfs_file_sync(&lfs, &file) => 0;
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lfs_file_tell(&lfs, &file) => SIZE;
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lfs_file_size(&lfs, &file) => SIZE;
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lfs_file_seek(&lfs, &file, 0, LFS_SEEK_SET) => 0;
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for (unsigned i = 0; i < SIZE; i++) {
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lfs_file_write(&lfs, &file, &buffer[j++ % 26], 1) => 1;
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lfs_file_tell(&lfs, &file) => i+1;
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lfs_file_size(&lfs, &file) => SIZE;
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lfs_file_sync(&lfs, &file) => 0;
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lfs_file_tell(&lfs, &file) => i+1;
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lfs_file_size(&lfs, &file) => SIZE;
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if (i < SIZE-2) {
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uint8_t c[3];
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lfs_file_seek(&lfs, &file, -1, LFS_SEEK_CUR) => i;
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lfs_file_read(&lfs, &file, &c, 3) => 3;
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lfs_file_tell(&lfs, &file) => i+3;
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lfs_file_size(&lfs, &file) => SIZE;
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lfs_file_seek(&lfs, &file, i+1, LFS_SEEK_SET) => i+1;
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lfs_file_tell(&lfs, &file) => i+1;
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lfs_file_size(&lfs, &file) => SIZE;
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}
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}
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lfs_file_seek(&lfs, &file, 0, LFS_SEEK_SET) => 0;
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lfs_file_tell(&lfs, &file) => 0;
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lfs_file_size(&lfs, &file) => SIZE;
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for (unsigned i = 0; i < SIZE; i++) {
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uint8_t c;
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lfs_file_read(&lfs, &file, &c, 1) => 1;
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c => buffer[k++ % 26];
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}
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lfs_file_sync(&lfs, &file) => 0;
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lfs_file_tell(&lfs, &file) => SIZE;
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lfs_file_size(&lfs, &file) => SIZE;
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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]] # file seek and write with power-loss
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# must be power-of-2 for quadratic probing to be exhaustive
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define.COUNT = [4, 64, 128]
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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, "kitty", LFS_O_RDONLY);
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assert(!err || err == LFS_ERR_NOENT);
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if (!err) {
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if (lfs_file_size(&lfs, &file) != 0) {
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lfs_file_size(&lfs, &file) => 11*COUNT;
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for (int j = 0; j < COUNT; j++) {
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memset(buffer, 0, 11+1);
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lfs_file_read(&lfs, &file, buffer, 11) => 11;
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assert(memcmp(buffer, "kittycatcat", 11) == 0 ||
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memcmp(buffer, "doggodogdog", 11) == 0);
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}
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}
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lfs_file_close(&lfs, &file) => 0;
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}
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lfs_file_open(&lfs, &file, "kitty", LFS_O_WRONLY | LFS_O_CREAT) => 0;
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if (lfs_file_size(&lfs, &file) == 0) {
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for (int j = 0; j < COUNT; j++) {
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strcpy((char*)buffer, "kittycatcat");
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size = strlen((char*)buffer);
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lfs_file_write(&lfs, &file, buffer, size) => size;
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}
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}
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lfs_file_close(&lfs, &file) => 0;
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strcpy((char*)buffer, "doggodogdog");
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size = strlen((char*)buffer);
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lfs_file_open(&lfs, &file, "kitty", LFS_O_RDWR) => 0;
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lfs_file_size(&lfs, &file) => COUNT*size;
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// seek and write using quadratic probing to touch all
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// 11-byte words in the file
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lfs_off_t off = 0;
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for (int j = 0; j < COUNT; j++) {
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off = (5*off + 1) % COUNT;
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lfs_file_seek(&lfs, &file, off*size, LFS_SEEK_SET) => off*size;
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lfs_file_read(&lfs, &file, buffer, size) => size;
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assert(memcmp(buffer, "kittycatcat", size) == 0 ||
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memcmp(buffer, "doggodogdog", size) == 0);
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if (memcmp(buffer, "doggodogdog", size) != 0) {
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lfs_file_seek(&lfs, &file, off*size, LFS_SEEK_SET) => off*size;
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strcpy((char*)buffer, "doggodogdog");
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lfs_file_write(&lfs, &file, buffer, size) => size;
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lfs_file_seek(&lfs, &file, off*size, LFS_SEEK_SET) => off*size;
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lfs_file_read(&lfs, &file, buffer, size) => size;
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assert(memcmp(buffer, "doggodogdog", size) == 0);
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lfs_file_sync(&lfs, &file) => 0;
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lfs_file_seek(&lfs, &file, off*size, LFS_SEEK_SET) => off*size;
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lfs_file_read(&lfs, &file, buffer, size) => size;
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assert(memcmp(buffer, "doggodogdog", size) == 0);
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}
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}
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lfs_file_close(&lfs, &file) => 0;
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|
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lfs_file_open(&lfs, &file, "kitty", LFS_O_RDWR) => 0;
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lfs_file_size(&lfs, &file) => COUNT*size;
|
|
for (int j = 0; j < COUNT; j++) {
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lfs_file_read(&lfs, &file, buffer, size) => size;
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assert(memcmp(buffer, "doggodogdog", size) == 0);
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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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'''
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