On Thu, Jul 21, 2022 at 8:12 PM Coly Li <colyli@xxxxxxx> wrote:
>
> This patch adds the following helper structure and routines into
> badblocks.h,
> - struct badblocks_context
> This structure is used in improved badblocks code for bad table
> iteration.
> - BB_END()
> The macro to calculate end LBA of a bad range record from bad
> table.
> - badblocks_full() and badblocks_empty()
> The inline routines to check whether bad table is full or empty.
> - set_changed() and clear_changed()
> The inline routines to set and clear 'changed' tag from struct
> badblocks.
>
> These new helper structure and routines can help to make the code more
> clear, they will be used in the improved badblocks code in following
> patches.
>
> Signed-off-by: Coly Li <colyli@xxxxxxx>
> Cc: Dan Williams <dan.j.williams@xxxxxxxxx>
> Cc: Geliang Tang <geliang.tang@xxxxxxxx>
> Cc: Hannes Reinecke <hare@xxxxxxx>
> Cc: Jens Axboe <axboe@xxxxxxxxx>
> Cc: NeilBrown <neilb@xxxxxxx>
> Cc: Vishal L Verma <vishal.l.verma@xxxxxxxxx>
> Cc: Xiao Ni <xni@xxxxxxxxxx>
> ---
> include/linux/badblocks.h | 30 ++++++++++++++++++++++++++++++
> 1 file changed, 30 insertions(+)
>
> diff --git a/include/linux/badblocks.h b/include/linux/badblocks.h
> index 2426276b9bd3..670f2dae692f 100644
> --- a/include/linux/badblocks.h
> +++ b/include/linux/badblocks.h
> @@ -15,6 +15,7 @@
> #define BB_OFFSET(x) (((x) & BB_OFFSET_MASK) >> 9)
> #define BB_LEN(x) (((x) & BB_LEN_MASK) + 1)
> #define BB_ACK(x) (!!((x) & BB_ACK_MASK))
> +#define BB_END(x) (BB_OFFSET(x) + BB_LEN(x))
> #define BB_MAKE(a, l, ack) (((a)<<9) | ((l)-1) | ((u64)(!!(ack)) << 63))
>
> /* Bad block numbers are stored sorted in a single page.
> @@ -41,6 +42,12 @@ struct badblocks {
> sector_t size; /* in sectors */
> };
>
> +struct badblocks_context {
> + sector_t start;
> + sector_t len;
> + int ack;
> +};
> +
> int badblocks_check(struct badblocks *bb, sector_t s, int sectors,
> sector_t *first_bad, int *bad_sectors);
> int badblocks_set(struct badblocks *bb, sector_t s, int sectors,
> @@ -63,4 +70,27 @@ static inline void devm_exit_badblocks(struct device *dev, struct badblocks *bb)
> }
> badblocks_exit(bb);
> }
> +
> +static inline int badblocks_full(struct badblocks *bb)
> +{
> + return (bb->count >= MAX_BADBLOCKS);
> +}
> +
> +static inline int badblocks_empty(struct badblocks *bb)
> +{
> + return (bb->count == 0);
> +}
> +
> +static inline void set_changed(struct badblocks *bb)
> +{
> + if (bb->changed != 1)
> + bb->changed = 1;
> +}
> +
> +static inline void clear_changed(struct badblocks *bb)
> +{
> + if (bb->changed != 0)
> + bb->changed = 0;
> +}
> +
> #endif
> --
> 2.35.3
>
Reviewed-by: Xiao Ni <xni@xxxxxxxxxx>
