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authorJohannes Thumshirn <jthumshirn@suse.de>2019-08-30 14:36:09 +0300
committerDavid Sterba <dsterba@suse.com>2019-09-09 15:59:19 +0300
commitaf024ed2e0e56f27279cdba4d27a23dbb7677e40 (patch)
treec7d8d0d5e4d23647c58efee6ee9db6057f127b5c /fs/btrfs/ctree.c
parente35b79a1070d681b4842dad27b1edaf9811da7e9 (diff)
downloadlinux-af024ed2e0e56f27279cdba4d27a23dbb7677e40.tar.xz
btrfs: create structure to encode checksum type and length
Create a structure to encode the type and length for the known on-disk checksums. This makes it easier to add new checksums later. The structure and helpers are moved from ctree.h so they don't occupy space in all headers including ctree.h. This save some space in the final object. Reviewed-by: Nikolay Borisov <nborisov@suse.com> Signed-off-by: Johannes Thumshirn <jthumshirn@suse.de> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'fs/btrfs/ctree.c')
-rw-r--r--fs/btrfs/ctree.c22
1 files changed, 22 insertions, 0 deletions
diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c
index 88c3b338508d..98f741c85905 100644
--- a/fs/btrfs/ctree.c
+++ b/fs/btrfs/ctree.c
@@ -29,6 +29,28 @@ static int balance_node_right(struct btrfs_trans_handle *trans,
static void del_ptr(struct btrfs_root *root, struct btrfs_path *path,
int level, int slot);
+static const struct btrfs_csums {
+ u16 size;
+ const char *name;
+} btrfs_csums[] = {
+ [BTRFS_CSUM_TYPE_CRC32] = { .size = 4, .name = "crc32c" },
+};
+
+int btrfs_super_csum_size(const struct btrfs_super_block *s)
+{
+ u16 t = btrfs_super_csum_type(s);
+ /*
+ * csum type is validated at mount time
+ */
+ return btrfs_csums[t].size;
+}
+
+const char *btrfs_super_csum_name(u16 csum_type)
+{
+ /* csum type is validated at mount time */
+ return btrfs_csums[csum_type].name;
+}
+
struct btrfs_path *btrfs_alloc_path(void)
{
return kmem_cache_zalloc(btrfs_path_cachep, GFP_NOFS);