1 files changed, 17 insertions, 0 deletions

diff --git a/fs/btrfs/crc32c.h b/fs/btrfs/crc32c.h
new file mode 100644
index 000000000000..a93255b4ee27
--- /dev/null
+++ b/fs/btrfs/crc32c.h
@@ -0,0 +1,17 @@
+#include <asm/byteorder.h>
+#include <linux/crc32c.h>
+#include <linux/version.h>
+
+/**
+ * implementation of crc32c_le() changed in linux-2.6.23,
+ * has of v0.13 btrfs-progs is using the latest version.
+ * We must workaround older implementations of crc32c_le()
+ * found on older kernel versions.
+ */
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23)
+#define btrfs_crc32c(seed, data, length) \
+        __cpu_to_le32( crc32c( __le32_to_cpu(seed), data, length) )
+#else
+#define btrfs_crc32c(seed, data, length) \
+        crc32c(seed, data, length)
+#endif