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Commit 9ed57367 authored by David Sterba's avatar David Sterba
Browse files

btrfs: constify input buffer of btrfs_csum_data 



The function does not modify the input buffer, also update a typecast in
one caller.

Signed-off-by: default avatarDavid Sterba <dsterba@suse.com>
parent da353f6b

fs/btrfs/disk-io.c

+2 −2
Original line number Diff line number Diff line
@@ -265,7 +265,7 @@ static struct extent_map *btree_get_extent(struct btrfs_inode *inode, 
	return em;

}



u32 btrfs_csum_data(char *data, u32 seed, size_t len)

u32 btrfs_csum_data(const char *data, u32 seed, size_t len)

{

	return btrfs_crc32c(seed, data, len);

}
@@ -3448,7 +3448,7 @@ static int write_dev_supers(struct btrfs_device *device, 
			btrfs_set_super_bytenr(sb, bytenr);



			crc = ~(u32)0;

			crc = btrfs_csum_data((char *)sb +

			crc = btrfs_csum_data((const char *)sb +

					      BTRFS_CSUM_SIZE, crc,

					      BTRFS_SUPER_INFO_SIZE -

					      BTRFS_CSUM_SIZE);

fs/btrfs/disk-io.h

+1 −1
Original line number Diff line number Diff line
@@ -116,7 +116,7 @@ void btrfs_mark_buffer_dirty(struct extent_buffer *buf); 
int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid,

			  int atomic);

int btrfs_read_buffer(struct extent_buffer *buf, u64 parent_transid);

u32 btrfs_csum_data(char *data, u32 seed, size_t len);

u32 btrfs_csum_data(const char *data, u32 seed, size_t len);

void btrfs_csum_final(u32 crc, u8 *result);

int btrfs_bio_wq_end_io(struct btrfs_fs_info *info, struct bio *bio,

			enum btrfs_wq_endio_type metadata);