mirror of
https://github.com/eledio-devices/thirdparty-littlefs.git
synced 2025-10-31 16:14:16 +01:00
8a674524fc
In writing the initial allocator, I ran into the rather difficult problem of trying to iterate through the entire filesystem cheaply and with only constant memory consumption (which prohibits recursive functions). The solution was to simply thread all directory blocks onto a massive linked-list that spans the entire filesystem. With the linked-list it was easy to create a traverse function for all blocks in use on the filesystem (which has potential for other utility), and add the rudimentary block allocator using a bit-vector. While the linked-list may add complexity (especially where needing to maintain atomic operations), the linked-list helps simplify what is currently the most expensive operation in the filesystem, with no cost to space (the linked-list can reuse the pointers used for chained directory blocks).
128 lines
3.8 KiB
Bash
Executable File
128 lines
3.8 KiB
Bash
Executable File
#!/bin/bash
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set -eu
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LARGESIZE=128
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echo "=== Directory tests ==="
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rm -rf blocks
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tests/test.py << TEST
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lfs_format(&lfs, &config) => 0;
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TEST
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echo "--- Root directory ---"
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tests/test.py << TEST
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lfs_mount(&lfs, &config) => 0;
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lfs_dir_open(&lfs, &dir[0], "/") => 0;
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lfs_dir_close(&lfs, &dir[0]) => 0;
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lfs_unmount(&lfs) => 0;
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TEST
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echo "--- Directory creation ---"
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tests/test.py << TEST
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lfs_mount(&lfs, &config) => 0;
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lfs_mkdir(&lfs, "potato") => 0;
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lfs_unmount(&lfs) => 0;
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TEST
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echo "--- File creation ---"
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tests/test.py << TEST
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lfs_mount(&lfs, &config) => 0;
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lfs_file_open(&lfs, &file[0], "burito", LFS_O_CREAT | LFS_O_WRONLY) => 0;
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lfs_file_close(&lfs, &file[0]) => 0;
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lfs_unmount(&lfs) => 0;
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TEST
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echo "--- Directory iteration ---"
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tests/test.py << TEST
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lfs_mount(&lfs, &config) => 0;
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lfs_dir_open(&lfs, &dir[0], "/") => 0;
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lfs_dir_read(&lfs, &dir[0], &info) => 1;
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strcmp(info.name, ".") => 0;
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info.type => LFS_TYPE_DIR;
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lfs_dir_read(&lfs, &dir[0], &info) => 1;
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strcmp(info.name, "..") => 0;
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info.type => LFS_TYPE_DIR;
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lfs_dir_read(&lfs, &dir[0], &info) => 1;
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strcmp(info.name, "potato") => 0;
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info.type => LFS_TYPE_DIR;
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lfs_dir_read(&lfs, &dir[0], &info) => 1;
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strcmp(info.name, "burito") => 0;
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info.type => LFS_TYPE_REG;
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lfs_dir_read(&lfs, &dir[0], &info) => 0;
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lfs_dir_close(&lfs, &dir[0]) => 0;
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lfs_unmount(&lfs) => 0;
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TEST
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echo "--- Directory failures ---"
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tests/test.py << TEST
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lfs_mount(&lfs, &config) => 0;
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lfs_mkdir(&lfs, "potato") => LFS_ERROR_EXISTS;
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lfs_dir_open(&lfs, &dir[0], "tomato") => LFS_ERROR_NO_ENTRY;
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lfs_dir_open(&lfs, &dir[0], "burito") => LFS_ERROR_NOT_DIR;
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lfs_file_open(&lfs, &file[0], "tomato", LFS_O_RDONLY) => LFS_ERROR_NO_ENTRY;
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lfs_file_open(&lfs, &file[0], "potato", LFS_O_RDONLY) => LFS_ERROR_IS_DIR;
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lfs_unmount(&lfs) => 0;
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TEST
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echo "--- Nested directories ---"
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tests/test.py << TEST
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lfs_mount(&lfs, &config) => 0;
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lfs_mkdir(&lfs, "potato/baked") => 0;
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lfs_mkdir(&lfs, "potato/sweet") => 0;
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lfs_mkdir(&lfs, "potato/fried") => 0;
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lfs_unmount(&lfs) => 0;
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TEST
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tests/test.py << TEST
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lfs_mount(&lfs, &config) => 0;
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lfs_dir_open(&lfs, &dir[0], "potato") => 0;
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lfs_dir_read(&lfs, &dir[0], &info) => 1;
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strcmp(info.name, ".") => 0;
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info.type => LFS_TYPE_DIR;
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lfs_dir_read(&lfs, &dir[0], &info) => 1;
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strcmp(info.name, "..") => 0;
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info.type => LFS_TYPE_DIR;
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lfs_dir_read(&lfs, &dir[0], &info) => 1;
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strcmp(info.name, "baked") => 0;
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info.type => LFS_TYPE_DIR;
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lfs_dir_read(&lfs, &dir[0], &info) => 1;
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strcmp(info.name, "sweet") => 0;
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info.type => LFS_TYPE_DIR;
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lfs_dir_read(&lfs, &dir[0], &info) => 1;
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strcmp(info.name, "fried") => 0;
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info.type => LFS_TYPE_DIR;
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lfs_dir_read(&lfs, &dir[0], &info) => 0;
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lfs_dir_close(&lfs, &dir[0]) => 0;
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lfs_unmount(&lfs) => 0;
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TEST
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echo "--- Multi-block directory ---"
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tests/test.py << TEST
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lfs_mount(&lfs, &config) => 0;
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lfs_mkdir(&lfs, "cactus") => 0;
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for (int i = 0; i < $LARGESIZE; i++) {
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sprintf((char*)buffer, "cactus/test%d", i);
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lfs_mkdir(&lfs, (char*)buffer) => 0;
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}
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lfs_unmount(&lfs) => 0;
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TEST
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tests/test.py << TEST
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lfs_mount(&lfs, &config) => 0;
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lfs_dir_open(&lfs, &dir[0], "cactus") => 0;
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lfs_dir_read(&lfs, &dir[0], &info) => 1;
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strcmp(info.name, ".") => 0;
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info.type => LFS_TYPE_DIR;
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lfs_dir_read(&lfs, &dir[0], &info) => 1;
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strcmp(info.name, "..") => 0;
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info.type => LFS_TYPE_DIR;
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for (int i = 0; i < $LARGESIZE; i++) {
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sprintf((char*)buffer, "test%d", i);
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lfs_dir_read(&lfs, &dir[0], &info) => 1;
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strcmp(info.name, (char*)buffer) => 0;
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}
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lfs_dir_read(&lfs, &dir[0], &info) => 0;
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lfs_unmount(&lfs) => 0;
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TEST
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echo "--- Results ---"
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tests/stats.py
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