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Commit 9111e568 authored by Keith Busch's avatar Keith Busch Committed by Jens Axboe
Browse files

block: Provide blk_status_t decoding for path errors 



This patch provides a common decoder for block status path related errors
that may be retried so various entities wishing to consult this do not
have to duplicate this decision.

Acked-by: default avatarMike Snitzer <snitzer@redhat.com>
Reviewed-by: default avatarHannes Reinecke <hare@suse.com>
Signed-off-by: default avatarKeith Busch <keith.busch@intel.com>
Reviewed-by: default avatarJohannes Thumshirn <jthumshirn@suse.de>
Reviewed-by: default avatarChristoph Hellwig <hch@lst.de>
Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent 908e4564

include/linux/blk_types.h

+28 −0
Original line number Diff line number Diff line
@@ -39,6 +39,34 @@ typedef u8 __bitwise blk_status_t; 


#define BLK_STS_AGAIN		((__force blk_status_t)12)



/**

 * blk_path_error - returns true if error may be path related

 * @error: status the request was completed with

 *

 * Description:

 *     This classifies block error status into non-retryable errors and ones

 *     that may be successful if retried on a failover path.

 *

 * Return:

 *     %false - retrying failover path will not help

 *     %true  - may succeed if retried

 */

static inline bool blk_path_error(blk_status_t error)

{

	switch (error) {

	case BLK_STS_NOTSUPP:

	case BLK_STS_NOSPC:

	case BLK_STS_TARGET:

	case BLK_STS_NEXUS:

	case BLK_STS_MEDIUM:

	case BLK_STS_PROTECTION:

		return false;

	}



	/* Anything else could be a path failure, so should be retried */

	return true;

}



struct blk_issue_stat {

	u64 stat;

};