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>

1 files changed, 6 insertions, 0 deletions

diff --git a/lib/libcrc32c.c b/lib/libcrc32c.c
index 9f79547d1b97..f0a2934605bf 100644
--- a/lib/libcrc32c.c
+++ b/lib/libcrc32c.c
@@ -71,6 +71,12 @@ static void __exit libcrc32c_mod_fini(void)
 	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);