[PATCH 2/6] fscrypt: rename ->ci_master_key to ->ci_master_key_descriptor

[Eric Biggers]

From: Eric Biggers <ebiggers at google.com>

In struct fscrypt_info, ->ci_master_key is the master key descriptor,
not the master key itself.  In preparation for introducing a struct
fscrypt_master_key and making ->ci_master_key point to it, rename the
existing ->ci_master_key to ->ci_master_key_descriptor.

Signed-off-by: Eric Biggers <ebiggers at google.com>
---
 fs/crypto/fscrypt_private.h | 2 +-
 fs/crypto/keyinfo.c         | 4 ++--
 fs/crypto/policy.c          | 5 +++--
 3 files changed, 6 insertions(+), 5 deletions(-)

diff --git a/fs/crypto/fscrypt_private.h b/fs/crypto/fscrypt_private.h
index ef6909035823..5470aac82cab 100644
--- a/fs/crypto/fscrypt_private.h
+++ b/fs/crypto/fscrypt_private.h
@@ -107,7 +107,7 @@ struct fscrypt_info {
 	u8 ci_data_mode;
 	u8 ci_filename_mode;
 	u8 ci_flags;
-	u8 ci_master_key[FS_KEY_DESCRIPTOR_SIZE];
+	u8 ci_master_key_descriptor[FS_KEY_DESCRIPTOR_SIZE];
 };
 
 typedef enum {
diff --git a/fs/crypto/keyinfo.c b/fs/crypto/keyinfo.c
index 7e664a11340a..5591fd24e4b2 100644
--- a/fs/crypto/keyinfo.c
+++ b/fs/crypto/keyinfo.c
@@ -293,8 +293,8 @@ int fscrypt_get_encryption_info(struct inode *inode)
 	crypt_info->ci_data_mode = ctx.contents_encryption_mode;
 	crypt_info->ci_filename_mode = ctx.filenames_encryption_mode;
 	crypt_info->ci_flags = ctx.flags;
-	memcpy(crypt_info->ci_master_key, ctx.master_key_descriptor,
-				sizeof(crypt_info->ci_master_key));
+	memcpy(crypt_info->ci_master_key_descriptor, ctx.master_key_descriptor,
+	       FS_KEY_DESCRIPTOR_SIZE);
 
 	res = determine_cipher_type(crypt_info, inode, &cipher_str, &keysize);
 	if (res)
diff --git a/fs/crypto/policy.c b/fs/crypto/policy.c
index 044f23fadb5a..81c59f8e45c0 100644
--- a/fs/crypto/policy.c
+++ b/fs/crypto/policy.c
@@ -224,7 +224,8 @@ int fscrypt_has_permitted_context(struct inode *parent, struct inode *child)
 	child_ci = child->i_crypt_info;
 
 	if (parent_ci && child_ci) {
-		return memcmp(parent_ci->ci_master_key, child_ci->ci_master_key,
+		return memcmp(parent_ci->ci_master_key_descriptor,
+			      child_ci->ci_master_key_descriptor,
 			      FS_KEY_DESCRIPTOR_SIZE) == 0 &&
 			(parent_ci->ci_context_version ==
 			 child_ci->ci_context_version) &&
@@ -282,7 +283,7 @@ int fscrypt_inherit_context(struct inode *parent, struct inode *child,
 	ctx.contents_encryption_mode = ci->ci_data_mode;
 	ctx.filenames_encryption_mode = ci->ci_filename_mode;
 	ctx.flags = ci->ci_flags;
-	memcpy(ctx.master_key_descriptor, ci->ci_master_key,
+	memcpy(ctx.master_key_descriptor, ci->ci_master_key_descriptor,
 	       FS_KEY_DESCRIPTOR_SIZE);
 	get_random_bytes(ctx.nonce, FS_KEY_DERIVATION_NONCE_SIZE);
 	if (ctx.version != FSCRYPT_CONTEXT_V1)
-- 
2.13.2.932.g7449e964c-goog