From 352ae07b599a03b08a2149d9c2ff9c3479591af2 Mon Sep 17 00:00:00 2001
From: David Sterba <dsterba@suse.com>
Date: Mon, 7 Oct 2019 11:11:02 +0200
Subject: btrfs: add blake2b to checksumming algorithms

Add blake2b (with 256 bit digest) to the list of possible checksumming
algorithms used by BTRFS.

Signed-off-by: David Sterba <dsterba@suse.com>
---
 fs/btrfs/ctree.c   | 2 ++
 fs/btrfs/disk-io.c | 1 +
 fs/btrfs/super.c   | 1 +
 3 files changed, 4 insertions(+)

(limited to 'fs/btrfs')

diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c
index c211216b4524..5b6e86aaf2e1 100644
--- a/fs/btrfs/ctree.c
+++ b/fs/btrfs/ctree.c
@@ -37,6 +37,8 @@ static const struct btrfs_csums {
 	[BTRFS_CSUM_TYPE_CRC32] = { .size = 4, .name = "crc32c" },
 	[BTRFS_CSUM_TYPE_XXHASH] = { .size = 8, .name = "xxhash64" },
 	[BTRFS_CSUM_TYPE_SHA256] = { .size = 32, .name = "sha256" },
+	[BTRFS_CSUM_TYPE_BLAKE2] = { .size = 32, .name = "blake2b",
+				     .driver = "blake2b-256" },
 };
 
 int btrfs_super_csum_size(const struct btrfs_super_block *s)
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 948ed5ac0794..7c345c4bc817 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -354,6 +354,7 @@ static bool btrfs_supported_super_csum(u16 csum_type)
 	case BTRFS_CSUM_TYPE_CRC32:
 	case BTRFS_CSUM_TYPE_XXHASH:
 	case BTRFS_CSUM_TYPE_SHA256:
+	case BTRFS_CSUM_TYPE_BLAKE2:
 		return true;
 	default:
 		return false;
diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
index 36440336c08b..792bb0bc9a0b 100644
--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -2464,3 +2464,4 @@ MODULE_LICENSE("GPL");
 MODULE_SOFTDEP("pre: crc32c");
 MODULE_SOFTDEP("pre: xxhash64");
 MODULE_SOFTDEP("pre: sha256");
+MODULE_SOFTDEP("pre: blake2b-256");
-- 
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