bcache in userspace; userspace fsck

1 files changed, 24 insertions, 0 deletions

diff --git a/libbcache/checksum.h b/libbcache/checksum.h
new file mode 100644
index 0000000..196b7e8
--- /dev/null
+++ b/libbcache/checksum.h
@@ -0,0 +1,24 @@
+#ifndef _BCACHE_CHECKSUM_H
+#define _BCACHE_CHECKSUM_H
+
+#include "btree_types.h"
+
+u64 bch_crc64_update(u64, const void *, size_t);
+
+u64 bch_checksum_update(unsigned, u64, const void *, size_t);
+u64 bch_checksum(unsigned, const void *, size_t);
+u32 bch_checksum_bio(struct bio *, unsigned);
+
+/*
+ * This is used for various on disk data structures - cache_sb, prio_set, bset,
+ * jset: The checksum is _always_ the first 8 bytes of these structs
+ */
+#define __csum_set(i, u64s, type)					\
+({									\
+	const void *start = ((const void *) (i)) + sizeof(u64);		\
+	const void *end = __bkey_idx(i, u64s);				\
+									\
+	bch_checksum(type, start, end - start);				\
+})
+
+#endif /* _BCACHE_CHECKSUM_H */