From b4e967be431cf37f56cd1993592943007d7ab03b Mon Sep 17 00:00:00 2001 From: David Sterba Date: Tue, 8 Oct 2019 18:41:33 +0200 Subject: btrfs: add member for a specific checksum driver Currently all the checksum algorithms generate a fixed size digest size and we use it. The on-disk format can hold up to BTRFS_CSUM_SIZE bytes and BLAKE2b produces digest of 512 bits by default. We can't do that and will use the blake2b-256, this needs to be passed to the crypto API. Separate that from the base algorithm name and add a member to request specific driver, in this case with the digest size. The only place that uses the driver name is the crypto API setup. Signed-off-by: David Sterba --- fs/btrfs/ctree.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) (limited to 'fs/btrfs/ctree.c') diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c index c1561097e5a3..c211216b4524 100644 --- a/fs/btrfs/ctree.c +++ b/fs/btrfs/ctree.c @@ -32,6 +32,7 @@ static void del_ptr(struct btrfs_root *root, struct btrfs_path *path, static const struct btrfs_csums { u16 size; const char *name; + const char *driver; } btrfs_csums[] = { [BTRFS_CSUM_TYPE_CRC32] = { .size = 4, .name = "crc32c" }, [BTRFS_CSUM_TYPE_XXHASH] = { .size = 8, .name = "xxhash64" }, @@ -53,6 +54,17 @@ const char *btrfs_super_csum_name(u16 csum_type) return btrfs_csums[csum_type].name; } +/* + * Return driver name if defined, otherwise the name that's also a valid driver + * name + */ +const char *btrfs_super_csum_driver(u16 csum_type) +{ + /* csum type is validated at mount time */ + return btrfs_csums[csum_type].driver ?: + btrfs_csums[csum_type].name; +} + size_t __const btrfs_get_num_csums(void) { return ARRAY_SIZE(btrfs_csums); -- cgit v1.2.3