On Fri, Apr 01, 2016 at 02:34:58PM +0800, Qu Wenruo wrote:
> From: Wang Xiaoguang <wangxg.fnst@xxxxxxxxxxxxxx>
>
> Unlike in-memory or on-disk dedupe method, only SHA256 hash method is
> supported yet, so implement btrfs_dedupe_calc_hash() interface using
> SHA256.
>
> Signed-off-by: Qu Wenruo <quwenruo@xxxxxxxxxxxxxx>
> Signed-off-by: Wang Xiaoguang <wangxg.fnst@xxxxxxxxxxxxxx>
> ---
> fs/btrfs/dedupe.c | 49 +++++++++++++++++++++++++++++++++++++++++++++++++
> 1 file changed, 49 insertions(+)
>
> diff --git a/fs/btrfs/dedupe.c b/fs/btrfs/dedupe.c
> index 9175a5f..bdaea3a 100644
> --- a/fs/btrfs/dedupe.c
> +++ b/fs/btrfs/dedupe.c
> @@ -593,3 +593,52 @@ int btrfs_dedupe_search(struct btrfs_fs_info *fs_info,
> }
> return ret;
> }
> +
> +int btrfs_dedupe_calc_hash(struct btrfs_fs_info *fs_info,
> + struct inode *inode, u64 start,
> + struct btrfs_dedupe_hash *hash)
> +{
> + int i;
> + int ret;
> + struct page *p;
> + struct btrfs_dedupe_info *dedupe_info = fs_info->dedupe_info;
> + struct crypto_shash *tfm = dedupe_info->dedupe_driver;
> + struct {
> + struct shash_desc desc;
> + char ctx[crypto_shash_descsize(tfm)];
> + } sdesc;
This construct has been obsoleted, please use SHASH_DESC_ON_STACK.
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