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Fixed issue with long names causing unbounded recursion

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This was caused by any commit containing entries large enough to
_always_ force a compaction. This would cause littlefs to think that it
would need to split infinitely because there was no base case.

The fix here is pretty simple: treat any commit with only a single entry
as unsplittable. This forces littlefs to first try overcompacting
(fitting more in a block than what has optimal runtime), and then
failing that return LFS_ERR_NOSPC for higher layers to handle.

found by TheLoneWolfling
This commit is contained in:
Christopher Haster
2019-01-31 14:54:47 -06:00
parent 95c1a6339d
commit 10dfc36f08
2 changed files with 27 additions and 2 deletions
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24
tests/test_paths.sh
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@@ -165,5 +165,29 @@ tests/test.py << TEST
lfs_unmount(&lfs) => 0;
TEST
echo "--- Really big path test ---"
tests/test.py << TEST
lfs_mount(&lfs, &cfg) => 0;
memset(buffer, 'w', LFS_NAME_MAX);
buffer[LFS_NAME_MAX+1] = '\0';
lfs_mkdir(&lfs, (char*)buffer) => 0;
lfs_remove(&lfs, (char*)buffer) => 0;
lfs_file_open(&lfs, &file[0], (char*)buffer,
LFS_O_WRONLY | LFS_O_CREAT) => 0;
lfs_file_close(&lfs, &file[0]) => 0;
lfs_remove(&lfs, (char*)buffer) => 0;
memcpy(buffer, "coffee/", strlen("coffee/"));
memset(buffer+strlen("coffee/"), 'w', LFS_NAME_MAX);
buffer[strlen("coffee/")+LFS_NAME_MAX+1] = '\0';
lfs_mkdir(&lfs, (char*)buffer) => 0;
lfs_remove(&lfs, (char*)buffer) => 0;
lfs_file_open(&lfs, &file[0], (char*)buffer,
LFS_O_WRONLY | LFS_O_CREAT) => 0;
lfs_file_close(&lfs, &file[0]) => 0;
lfs_remove(&lfs, (char*)buffer) => 0;
lfs_unmount(&lfs) => 0;
TEST
echo "--- Results ---"
tests/stats.py