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crc-t10dif: Allow current transform to be inspected in sysfs 

Add a way to print the currently active CRC algorithm in:

	/sys/module/crc_t10dif/parameters/transform

Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Martin K. Petersen 2018-08-30 11:00:16 -04:00 committed by Herbert Xu
parent b76377543b
commit 11dcb1037f
1 changed files with 11 additions and 0 deletions
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11
lib/crc-t10dif.c
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@ -107,6 +107,17 @@ static void __exit crc_t10dif_mod_fini(void)
module_init(crc_t10dif_mod_init); module_init(crc_t10dif_mod_init);
module_exit(crc_t10dif_mod_fini); module_exit(crc_t10dif_mod_fini);
static int crc_t10dif_transform_show(char *buffer, const struct kernel_param *kp)
{
if (static_key_false(&crct10dif_fallback))
return sprintf(buffer, "fallback\n");
return sprintf(buffer, "%s\n",
crypto_tfm_alg_driver_name(crypto_shash_tfm(crct10dif_tfm)));
}
module_param_call(transform, NULL, crc_t10dif_transform_show, NULL, 0644);
MODULE_DESCRIPTION("T10 DIF CRC calculation"); MODULE_DESCRIPTION("T10 DIF CRC calculation");
MODULE_LICENSE("GPL"); MODULE_LICENSE("GPL");
MODULE_SOFTDEP("pre: crct10dif"); MODULE_SOFTDEP("pre: crct10dif");