[PATCH for-next 4/5] erofs: clean up decompress queue stuffs

[Chao Yu]

On 2019/10/8 20:56, Gao Xiang wrote:
> Previously, both z_erofs_unzip_io and z_erofs_unzip_io_sb
> record decompress queues for backend to use.
> 
> The only difference is that z_erofs_unzip_io is used for
> on-stack sync decompression so that it doesn't have a super
> block field (since the caller can pass it in its context),
> but it increases complexity with only a pointer saving.
> 
> Rename z_erofs_unzip_io to z_erofs_decompressqueue with
> a fixed super_block member and kill the other entirely,
> and it can fallback to sync decompression if memory
> allocation failure.
> 
> Signed-off-by: Gao Xiang <gaoxiang25 at huawei.com>

Reviewed-by: Chao Yu <yuchao0 at huawei.com>

Thanks,