[PATCH 1/4] btrfs: add xxhash64 to checksumming algorithms

[Johannes Thumshirn]

Add xxhash64 to the list of possible checksumming algorithms used by
BTRFS.

Signed-off-by: Johannes Thumshirn <jthumsh...@suse.de>
---
 fs/btrfs/Kconfig                | 1 +
 fs/btrfs/ctree.c                | 1 +
 fs/btrfs/disk-io.c              | 1 +
 fs/btrfs/super.c                | 1 +
 include/uapi/linux/btrfs_tree.h | 1 +
 5 files changed, 5 insertions(+)

diff --git a/fs/btrfs/Kconfig b/fs/btrfs/Kconfig
index 38651fae7f21..6d5a01c57da3 100644
--- a/fs/btrfs/Kconfig
+++ b/fs/btrfs/Kconfig
@@ -5,6 +5,7 @@ config BTRFS_FS
        select CRYPTO
        select CRYPTO_CRC32C
        select LIBCRC32C
+       select CRYPTO_XXHASH
        select ZLIB_INFLATE
        select ZLIB_DEFLATE
        select LZO_COMPRESS
diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c
index 3a4d8e27e565..a1b317cf193b 100644
--- a/fs/btrfs/ctree.c
+++ b/fs/btrfs/ctree.c
@@ -34,6 +34,7 @@ static const struct btrfs_csums {
        const char      *name;
 } btrfs_csums[] = {
        [BTRFS_CSUM_TYPE_CRC32] = { .size = 4, .name = "crc32c" },
+       [BTRFS_CSUM_TYPE_XXHASH] = { .size = 8, .name = "xxhash64" },
 };
 
 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 ea40898d49eb..b0a6904b6139 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -352,6 +352,7 @@ static bool btrfs_supported_super_csum(u16 csum_type)
 {
        switch (csum_type) {
        case BTRFS_CSUM_TYPE_CRC32:
+       case BTRFS_CSUM_TYPE_XXHASH:
                return true;
        default:
                return false;
diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
index d5d15a19f51d..c91cdf123cd8 100644
--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -2462,3 +2462,4 @@ module_exit(exit_btrfs_fs)
 
 MODULE_LICENSE("GPL");
 MODULE_SOFTDEP("pre: crc32c");
+MODULE_SOFTDEP("pre: xxhash64");
diff --git a/include/uapi/linux/btrfs_tree.h b/include/uapi/linux/btrfs_tree.h
index b65c7ee75bc7..ba2f125a3a1c 100644
--- a/include/uapi/linux/btrfs_tree.h
+++ b/include/uapi/linux/btrfs_tree.h
@@ -302,6 +302,7 @@
 /* csum types */
 enum btrfs_csum_type {
        BTRFS_CSUM_TYPE_CRC32   = 0,
+       BTRFS_CSUM_TYPE_XXHASH  = 1,
 };
 
 /*
-- 
2.16.4