libcrc32c: Add crc32c_impl function
This function returns a string with the currently in-use implementation
of the crc32c algorithm, i.e crc32c-generic (for unoptimised, generic
implementation) or crc32c-intel for the sse optimised version. This
will be used by btrfs.
Signed-off-by: Nikolay Borisov <nborisov@suse.com>
Acked-by: Herbert Xu <herbert@gondor.apana.org.au>
[ use crypto_shash_driver_name as suggested by Herbert ]
Signed-off-by: David Sterba <dsterba@suse.com>
diff --git a/include/linux/crc32c.h b/include/linux/crc32c.h
index 357ae46..bd21af8 100644
--- a/include/linux/crc32c.h
+++ b/include/linux/crc32c.h
@@ -5,6 +5,7 @@
#include <linux/types.h>
extern u32 crc32c(u32 crc, const void *address, unsigned int length);
+extern const char *crc32c_impl(void);
/* This macro exists for backwards-compatibility. */
#define crc32c_le crc32c
diff --git a/lib/libcrc32c.c b/lib/libcrc32c.c
index 9f79547..f0a2934 100644
--- a/lib/libcrc32c.c
+++ b/lib/libcrc32c.c
@@ -71,6 +71,12 @@
crypto_free_shash(tfm);
}
+const char *crc32c_impl(void)
+{
+ return crypto_shash_driver_name(tfm);
+}
+EXPORT_SYMBOL(crc32c_impl);
+
module_init(libcrc32c_mod_init);
module_exit(libcrc32c_mod_fini);