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Reintroduced Brent's algorithm for cycle detection in lfsr_mount

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This commit is contained in:
Christopher Haster
2023-04-27 00:41:24 -05:00
parent 6236f460a4
commit 85ebdd0881
3 changed files with 69 additions and 3 deletions
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tests/test_superblocks.toml
+41
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@@ -14,6 +14,47 @@ code = '''
lfsr_unmount(&lfs) => 0;
'''
# reentrant format
[cases.test_superblocks_reentrant_format]
reentrant = true
code = '''
lfs_t lfs;
int err = lfsr_mount(&lfs, cfg);
if (err) {
lfsr_format(&lfs, cfg) => 0;
lfsr_mount(&lfs, cfg) => 0;
}
lfsr_unmount(&lfs) => 0;
'''
# invalid mount
[cases.test_superblocks_invalid]
code = '''
lfs_t lfs;
lfsr_mount(&lfs, cfg) => LFS_ERR_INVAL;
'''
# superblock cycle detection
[cases.test_superblocks_cycle]
in = 'lfs.c'
code = '''
// create a cycle
lfs_t lfs;
lfsr_format(&lfs, cfg) => 0;
lfsr_mount(&lfs, cfg) => 0;
lfsr_mdir_t mdir;
lfsr_mdir_fetch(&lfs, &mdir, LFSR_MPAIR(0, 1), NULL) => 0;
uint8_t buf[LFSR_MPAIR_DSIZE];
lfs_ssize_t d = lfsr_mpair_todisk(&lfs, LFSR_MPAIR(0, 1), buf);
assert(d >= 0);
lfsr_mdir_commit(&lfs, &mdir, LFSR_ATTRS(
LFSR_ATTR(-1, SUPERMDIR, 0, buf, d))) => 0;
lfsr_unmount(&lfs) => 0;
// now detect the cycle
lfsr_mount(&lfs, cfg) => LFS_ERR_CORRUPT;
'''