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" },
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);
int btrfs_super_csum_size(const struct btrfs_super_block *s);
const char *btrfs_super_csum_name(u16 csum_type);
+const char *btrfs_super_csum_driver(u16 csum_type);
size_t __const btrfs_get_num_csums(void);
static int btrfs_init_csum_hash(struct btrfs_fs_info *fs_info, u16 csum_type)
{
struct crypto_shash *csum_shash;
- const char *csum_name = btrfs_super_csum_name(csum_type);
+ const char *csum_driver = btrfs_super_csum_driver(csum_type);
- csum_shash = crypto_alloc_shash(csum_name, 0, 0);
+ csum_shash = crypto_alloc_shash(csum_driver, 0, 0);
if (IS_ERR(csum_shash)) {
btrfs_err(fs_info, "error allocating %s hash for checksum",
- csum_name);
+ csum_driver);
return PTR_ERR(csum_shash);
}