On 2020/02/19 2:29, Chaitanya Kulkarni wrote:
> Add a helper to stringify the zone conditions. We use this helper in the
> next patch to track zone conditions in tracepoints.
>
> Signed-off-by: Chaitanya Kulkarni <chaitanya.kulkarni@xxxxxxx>
> ---
> Changes from V1 : -
>
> 1. Move blk_zone_cond_str() to blk-zoned.c.
> 2. Mark zone_cond_namd array static.
> 3. Remove BLK_ZONE_COND_LAST.
> 4. Get rid of inline prefix for blk_zone_cond_str().
> ---
> block/blk-zoned.c | 32 ++++++++++++++++++++++++++++++++
> include/linux/blkdev.h | 10 ++++++++++
> 2 files changed, 42 insertions(+)
>
> diff --git a/block/blk-zoned.c b/block/blk-zoned.c
> index 05741c6f618b..f18f1ee9d71f 100644
> --- a/block/blk-zoned.c
> +++ b/block/blk-zoned.c
> @@ -20,6 +20,38 @@
>
> #include "blk.h"
>
> +#define ZONE_COND_NAME(name) [BLK_ZONE_COND_##name] = #name
> +static const char *const zone_cond_name[] = {
> + ZONE_COND_NAME(NOT_WP),
> + ZONE_COND_NAME(EMPTY),
> + ZONE_COND_NAME(IMP_OPEN),
> + ZONE_COND_NAME(EXP_OPEN),
> + ZONE_COND_NAME(CLOSED),
> + ZONE_COND_NAME(READONLY),
> + ZONE_COND_NAME(FULL),
> + ZONE_COND_NAME(OFFLINE),
> +};
> +#undef ZONE_COND_NAME
> +
> +/**
> + * blk_zone_cond_str - Return string XXX in BLK_ZONE_COND_XXX.
> + * @zone_cond: BLK_ZONE_COND_XXX.
> + *
> + * Description: Centralize block layer function to convert BLK_ZONE_COND_XXX
> + * into string format. Useful in the debugging and tracing zone conditions. For
> + * invalid BLK_ZONE_COND_XXX it returns string "UNKNOWN".
> + */
> +const char *blk_zone_cond_str(enum blk_zone_cond zone_cond)
> +{
> + static const char *zone_cond_str = "UNKNOWN";
> +
> + if (zone_cond < ARRAY_SIZE(zone_cond_name) && zone_cond_name[zone_cond])
> + zone_cond_str = zone_cond_name[zone_cond];
> +
> + return zone_cond_str;
> +}
> +EXPORT_SYMBOL_GPL(blk_zone_cond_str);
> +
> static inline sector_t blk_zone_start(struct request_queue *q,
> sector_t sector)
> {
> diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
> index 053ea4b51988..a40a3a27bfbc 100644
> --- a/include/linux/blkdev.h
> +++ b/include/linux/blkdev.h
> @@ -887,6 +887,16 @@ extern void blk_execute_rq_nowait(struct request_queue *, struct gendisk *,
> /* Helper to convert REQ_OP_XXX to its string format XXX */
> extern const char *blk_op_str(unsigned int op);
>
> +#ifdef CONFIG_BLK_DEV_ZONED
> +/* Helper to convert BLK_ZONE_ZONE_XXX to its string format XXX */
> +extern const char *blk_zone_cond_str(enum blk_zone_cond zone_cond);
> +#else
> +static const char *blk_zone_cond_str(unsigned int zone_cond)
> +{
> + return "NOT SUPPORTED";
> +}
why not inline ? That compiles ? Please check builds with
CONFIG_BLK_DEV_ZONED disabled.
> +#endif /* CONFIG_BLK_DEV_ZONED */
> +
> int blk_status_to_errno(blk_status_t status);
> blk_status_t errno_to_blk_status(int errno);
>
>
--
Damien Le Moal
Western Digital Research
