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libcrc32c: Add crc32c_impl function

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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>
This commit is contained in:
Nikolay Borisov 2018-01-08 11:45:04 +02:00 committed by David Sterba
parent 3e72ee8874
commit df91f56adc
2 changed files with 7 additions and 0 deletions
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1
include/linux/crc32c.h
View File

@ -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

6
lib/libcrc32c.c
View File

@ -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);