Commit b3cbfb0d authored by Josef Bacik's avatar Josef Bacik Committed by David Sterba
Browse files

btrfs: add a btrfs_csum_type_size helper 



This is needed in btrfs-progs for the tools that convert the checksum
types for file systems and a few other things.  We don't have it in the
kernel as we just want to get the size for the super blocks type.
However I don't want to have to manually add this every time we sync
ctree.c into btrfs-progs, so add the helper in the kernel with a note so
it doesn't get removed by a later cleanup.

Signed-off-by: default avatarJosef Bacik <josef@toxicpanda.com>
Signed-off-by: default avatarDavid Sterba <dsterba@suse.com>
parent a95b7f93

fs/btrfs/ctree.c

+7 −1
Original line number Diff line number Diff line
@@ -150,13 +150,19 @@ static inline void copy_leaf_items(const struct extent_buffer *dst, 
			      nr_items * sizeof(struct btrfs_item));

}



/* This exists for btrfs-progs usages. */

u16 btrfs_csum_type_size(u16 type)

{

	return btrfs_csums[type].size;

}



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;

	return btrfs_csum_type_size(t);

}



const char *btrfs_super_csum_name(u16 csum_type)

fs/btrfs/ctree.h

+1 −0
Original line number Diff line number Diff line
@@ -701,6 +701,7 @@ static inline bool btrfs_is_data_reloc_root(const struct btrfs_root *root) 
	return root->root_key.objectid == BTRFS_DATA_RELOC_TREE_OBJECTID;

}



u16 btrfs_csum_type_size(u16 type);

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);