fsverity: constify fsverity_hash_alg

Now that fsverity_hash_alg doesn't have an embedded mempool, it can be
'const' almost everywhere.  Add it.

Link: https://lore.kernel.org/r/20230604022348.48658-1-ebiggers@kernel.org
Signed-off-by: Eric Biggers <ebiggers@google.com>

1 files changed, 4 insertions, 4 deletions

diff --git a/fs/verity/hash_algs.c b/fs/verity/hash_algs.c
index e7e982412e23..c598d2035476 100644
--- a/fs/verity/hash_algs.c
+++ b/fs/verity/hash_algs.c
@@ -39,8 +39,8 @@ static DEFINE_MUTEX(fsverity_hash_alg_init_mutex);
  *
  * Return: pointer to the hash alg on success, else an ERR_PTR()
  */
-struct fsverity_hash_alg *fsverity_get_hash_alg(const struct inode *inode,
-						unsigned int num)
+const struct fsverity_hash_alg *fsverity_get_hash_alg(const struct inode *inode,
+						      unsigned int num)
 {
 	struct fsverity_hash_alg *alg;
 	struct crypto_shash *tfm;
@@ -108,7 +108,7 @@ out_unlock:
  * Return: NULL if the salt is empty, otherwise the kmalloc()'ed precomputed
  *	   initial hash state on success or an ERR_PTR() on failure.
  */
-const u8 *fsverity_prepare_hash_state(struct fsverity_hash_alg *alg,
+const u8 *fsverity_prepare_hash_state(const struct fsverity_hash_alg *alg,
 				      const u8 *salt, size_t salt_size)
 {
 	u8 *hashstate = NULL;
@@ -206,7 +206,7 @@ int fsverity_hash_block(const struct merkle_tree_params *params,
  *
  * Return: 0 on success, -errno on failure
  */
-int fsverity_hash_buffer(struct fsverity_hash_alg *alg,
+int fsverity_hash_buffer(const struct fsverity_hash_alg *alg,
 			 const void *data, size_t size, u8 *out)
 {
 	return crypto_shash_tfm_digest(alg->tfm, data, size, out);