188 				  struct fscrypt_master_key *mk,  in setup_per_mode_enc_key()  argument
225 	err = fscrypt_hkdf_expand(&mk->mk_secret.hkdf,  in setup_per_mode_enc_key()
250 static int fscrypt_derive_siphash_key(const struct fscrypt_master_key *mk,  in fscrypt_derive_siphash_key()  argument
256 	err = fscrypt_hkdf_expand(&mk->mk_secret.hkdf, context, info, infolen,  in fscrypt_derive_siphash_key()
269 			       const struct fscrypt_master_key *mk)  in fscrypt_derive_dirhash_key()  argument
273 	err = fscrypt_derive_siphash_key(mk, HKDF_CONTEXT_DIRHASH_KEY,  in fscrypt_derive_dirhash_key()
283 			       const struct fscrypt_master_key *mk)  in fscrypt_hash_inode_number()  argument
286 	WARN_ON_ONCE(!mk->mk_ino_hash_key_initialized);  in fscrypt_hash_inode_number()
289 					      &mk->mk_ino_hash_key);  in fscrypt_hash_inode_number()
293 					    struct fscrypt_master_key *mk)  in fscrypt_setup_iv_ino_lblk_32_key()  argument
297 	err = setup_per_mode_enc_key(ci, mk, mk->mk_iv_ino_lblk_32_keys,  in fscrypt_setup_iv_ino_lblk_32_key()
303 	if (!smp_load_acquire(&mk->mk_ino_hash_key_initialized)) {  in fscrypt_setup_iv_ino_lblk_32_key()
307 		if (mk->mk_ino_hash_key_initialized)  in fscrypt_setup_iv_ino_lblk_32_key()
310 		err = fscrypt_derive_siphash_key(mk,  in fscrypt_setup_iv_ino_lblk_32_key()
312 						 NULL, 0, &mk->mk_ino_hash_key);  in fscrypt_setup_iv_ino_lblk_32_key()
316 		smp_store_release(&mk->mk_ino_hash_key_initialized, true);  in fscrypt_setup_iv_ino_lblk_32_key()
328 		fscrypt_hash_inode_number(ci, mk);  in fscrypt_setup_iv_ino_lblk_32_key()
333 				     struct fscrypt_master_key *mk,  in fscrypt_setup_v2_file_key()  argument
347 		err = setup_per_mode_enc_key(ci, mk, mk->mk_direct_keys,  in fscrypt_setup_v2_file_key()
357 		err = setup_per_mode_enc_key(ci, mk, mk->mk_iv_ino_lblk_64_keys,  in fscrypt_setup_v2_file_key()
362 		err = fscrypt_setup_iv_ino_lblk_32_key(ci, mk);  in fscrypt_setup_v2_file_key()
366 		err = fscrypt_hkdf_expand(&mk->mk_secret.hkdf,  in fscrypt_setup_v2_file_key()
381 		err = fscrypt_derive_dirhash_key(ci, mk);  in fscrypt_setup_v2_file_key()
406 static bool fscrypt_valid_master_key_size(const struct fscrypt_master_key *mk,  in fscrypt_valid_master_key_size()  argument
416 	if (mk->mk_secret.size < min_keysize) {  in fscrypt_valid_master_key_size()
419 			     master_key_spec_type(&mk->mk_spec),  in fscrypt_valid_master_key_size()
420 			     master_key_spec_len(&mk->mk_spec),  in fscrypt_valid_master_key_size()
421 			     (u8 *)&mk->mk_spec.u,  in fscrypt_valid_master_key_size()
422 			     mk->mk_secret.size, min_keysize);  in fscrypt_valid_master_key_size()
443 	struct fscrypt_master_key *mk;  in setup_file_encryption_key()  local
454 	mk = fscrypt_find_master_key(sb, &mk_spec);  in setup_file_encryption_key()
455 	if (unlikely(!mk)) {  in setup_file_encryption_key()
470 			mk = fscrypt_find_master_key(sb, &mk_spec);  in setup_file_encryption_key()
473 	if (unlikely(!mk)) {  in setup_file_encryption_key()
485 	down_read(&mk->mk_sem);  in setup_file_encryption_key()
488 	if (!is_master_key_secret_present(&mk->mk_secret)) {  in setup_file_encryption_key()
493 	if (!fscrypt_valid_master_key_size(mk, ci)) {  in setup_file_encryption_key()
500 		err = fscrypt_setup_v1_file_key(ci, mk->mk_secret.raw);  in setup_file_encryption_key()
503 		err = fscrypt_setup_v2_file_key(ci, mk, need_dirhash_key);  in setup_file_encryption_key()
513 	*mk_ret = mk;  in setup_file_encryption_key()
517 	up_read(&mk->mk_sem);  in setup_file_encryption_key()
518 	fscrypt_put_master_key(mk);  in setup_file_encryption_key()
524 	struct fscrypt_master_key *mk;  in put_crypt_info()  local
535 	mk = ci->ci_master_key;  in put_crypt_info()
536 	if (mk) {  in put_crypt_info()
543 		spin_lock(&mk->mk_decrypted_inodes_lock);  in put_crypt_info()
545 		spin_unlock(&mk->mk_decrypted_inodes_lock);  in put_crypt_info()
546 		fscrypt_put_master_key_activeref(ci->ci_inode->i_sb, mk);  in put_crypt_info()
560 	struct fscrypt_master_key *mk = NULL;  in fscrypt_setup_encryption_info()  local
583 	res = setup_file_encryption_key(crypt_info, need_dirhash_key, &mk);  in fscrypt_setup_encryption_info()
598 		if (mk) {  in fscrypt_setup_encryption_info()
599 			crypt_info->ci_master_key = mk;  in fscrypt_setup_encryption_info()
600 			refcount_inc(&mk->mk_active_refs);  in fscrypt_setup_encryption_info()
601 			spin_lock(&mk->mk_decrypted_inodes_lock);  in fscrypt_setup_encryption_info()
603 				 &mk->mk_decrypted_inodes);  in fscrypt_setup_encryption_info()
604 			spin_unlock(&mk->mk_decrypted_inodes_lock);  in fscrypt_setup_encryption_info()
610 	if (mk) {  in fscrypt_setup_encryption_info()
611 		up_read(&mk->mk_sem);  in fscrypt_setup_encryption_info()
612 		fscrypt_put_master_key(mk);  in fscrypt_setup_encryption_info()