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btrfs: constify input buffer of btrfs_csum_data

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

Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
David Sterba 2017-02-14 18:03:49 +01:00
parent da353f6b30
commit 9ed573674a
2 changed files with 3 additions and 3 deletions
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4
fs/btrfs/disk-io.c
View File

@ -265,7 +265,7 @@ out:
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);

2
fs/btrfs/disk-io.h
View File

@ -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);