f2fs crypto: get rid of ci_mode from struct f2fs_crypt_info

This patch integrates the below patch into f2fs.

"ext4 crypto: get rid of ci_mode from struct ext4_crypt_info

The ci_mode field was superfluous, and getting rid of it gets rid of
an unused hole in the structure."
Signed-off-by: NTheodore Ts'o <tytso@mit.edu>
Signed-off-by: NJaegeuk Kim <jaegeuk@kernel.org>

fs/f2fs/crypto.c

@@ -151,14 +151,13 @@ struct f2fs_crypto_ctx *f2fs_get_crypto_ctx(struct inode *inode)
 	 * Allocate a new Crypto API context if we don't already have
 	 * one or if it isn't the right mode.
 	 */
-	BUG_ON(ci->ci_mode == F2FS_ENCRYPTION_MODE_INVALID);
-	if (ctx->tfm && (ctx->mode != ci->ci_mode)) {
+	if (ctx->tfm && (ctx->mode != ci->ci_data_mode)) {
 		crypto_free_tfm(ctx->tfm);
 		ctx->tfm = NULL;
 		ctx->mode = F2FS_ENCRYPTION_MODE_INVALID;
 	}
 	if (!ctx->tfm) {
-		switch (ci->ci_mode) {
+		switch (ci->ci_data_mode) {
 		case F2FS_ENCRYPTION_MODE_AES_256_XTS:
 			ctx->tfm = crypto_ablkcipher_tfm(
 				crypto_alloc_ablkcipher("xts(aes)", 0, 0));
@@ -178,9 +177,9 @@ struct f2fs_crypto_ctx *f2fs_get_crypto_ctx(struct inode *inode)
 			ctx->tfm = NULL;
 			goto out;
 		}
-		ctx->mode = ci->ci_mode;
+		ctx->mode = ci->ci_data_mode;
 	}
-	BUG_ON(ci->ci_size != f2fs_encryption_key_size(ci->ci_mode));
+	BUG_ON(ci->ci_size != f2fs_encryption_key_size(ci->ci_data_mode));
 
 	/*
 	 * There shouldn't be a bounce page attached to the crypto
@@ -388,7 +387,7 @@ static int f2fs_page_crypto(struct f2fs_crypto_ctx *ctx,
 	int res = 0;
 
 	BUG_ON(!ctx->tfm);
-	BUG_ON(ctx->mode != fi->i_crypt_info->ci_mode);
+	BUG_ON(ctx->mode != fi->i_crypt_info->ci_data_mode);
 
 	if (ctx->mode != F2FS_ENCRYPTION_MODE_AES_256_XTS) {
 		printk_ratelimited(KERN_ERR

fs/f2fs/crypto_fname.c

@@ -269,9 +269,9 @@ int f2fs_setup_fname_crypto(struct inode *inode)
 	if (!ci || ci->ci_ctfm)
 		return 0;
 
-	if (ci->ci_mode != F2FS_ENCRYPTION_MODE_AES_256_CTS) {
+	if (ci->ci_filename_mode != F2FS_ENCRYPTION_MODE_AES_256_CTS) {
 		printk_once(KERN_WARNING "f2fs: unsupported key mode %d\n",
-				ci->ci_mode);
+				ci->ci_filename_mode);
 		return -ENOKEY;
 	}
 

fs/f2fs/crypto_key.c

@@ -148,14 +148,14 @@ int _f2fs_get_encryption_info(struct inode *inode)
 	memcpy(crypt_info->ci_master_key, ctx.master_key_descriptor,
 				sizeof(crypt_info->ci_master_key));
 	if (S_ISREG(inode->i_mode))
-		crypt_info->ci_mode = ctx.contents_encryption_mode;
+		crypt_info->ci_size =
+			f2fs_encryption_key_size(crypt_info->ci_data_mode);
 	else if (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode))
-		crypt_info->ci_mode = ctx.filenames_encryption_mode;
-	else {
-		printk(KERN_ERR "f2fs crypto: Unsupported inode type.\n");
+		crypt_info->ci_size =
+			f2fs_encryption_key_size(crypt_info->ci_filename_mode);
+	else
 		BUG();
-	}
-	crypt_info->ci_size = f2fs_encryption_key_size(crypt_info->ci_mode);
+
 	BUG_ON(!crypt_info->ci_size);
 
 	memcpy(full_key_descriptor, F2FS_KEY_DESC_PREFIX,

fs/f2fs/f2fs_crypto.h

@@ -75,7 +75,6 @@ struct f2fs_encryption_key {
 } __attribute__((__packed__));
 
 struct f2fs_crypt_info {
-	unsigned char	ci_mode;
 	unsigned char	ci_size;
 	char		ci_data_mode;
 	char		ci_filename_mode;