On Wed, Dec 23 2020 at 6:26am -0500,
Jeffle Xu <jefflexu@xxxxxxxxxxxxxxxxx> wrote:
> So that kiocb.ki_cookie can be defined as blk_qc_t, which will enforce
> the encapsulation.
>
> Signed-off-by: Jeffle Xu <jefflexu@xxxxxxxxxxxxxxxxx>
> ---
> include/linux/blk_types.h | 2 +-
> include/linux/fs.h | 2 +-
> include/linux/types.h | 3 +++
> 3 files changed, 5 insertions(+), 2 deletions(-)
>
> diff --git a/include/linux/blk_types.h b/include/linux/blk_types.h
> index 866f74261b3b..2e05244fc16d 100644
> --- a/include/linux/blk_types.h
> +++ b/include/linux/blk_types.h
> @@ -532,7 +532,7 @@ static inline int op_stat_group(unsigned int op)
> return op_is_write(op);
> }
>
> -typedef unsigned int blk_qc_t;
> +/* Macros for blk_qc_t */
> #define BLK_QC_T_NONE -1U
> #define BLK_QC_T_SHIFT 16
> #define BLK_QC_T_INTERNAL (1U << 31)
> diff --git a/include/linux/fs.h b/include/linux/fs.h
> index ad4cf1bae586..58db714c4834 100644
> --- a/include/linux/fs.h
> +++ b/include/linux/fs.h
> @@ -330,7 +330,7 @@ struct kiocb {
> u16 ki_hint;
> u16 ki_ioprio; /* See linux/ioprio.h */
> union {
> - unsigned int ki_cookie; /* for ->iopoll */
> + blk_qc_t ki_cookie; /* for ->iopoll */
> struct wait_page_queue *ki_waitq; /* for async buffered IO */
> };
>
> diff --git a/include/linux/types.h b/include/linux/types.h
> index a147977602b5..da5ca7e1bea9 100644
> --- a/include/linux/types.h
> +++ b/include/linux/types.h
> @@ -125,6 +125,9 @@ typedef s64 int64_t;
> typedef u64 sector_t;
> typedef u64 blkcnt_t;
>
> +/* cookie used for IO polling */
> +typedef unsigned int blk_qc_t;
> +
> /*
> * The type of an index into the pagecache.
> */
> --
> 2.27.0
>
Unfortunate that you cannot just include blk_types.h in fs.h; but
vma_is_dax() ruins that for us since commit baabda2614245 ("mm: always
enable thp for dax mappings").
Reviewed-by: Mike Snitzer <snitzer@xxxxxxxxxx>
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