Commit dffc480d authored by Damien Le Moal's avatar Damien Le Moal Committed by Martin K. Petersen
Browse files

scsi: block: Introduce BLK_STS_DURATION_LIMIT 



Introduce the new block I/O status BLK_STS_DURATION_LIMIT for LLDDs to
report command that failed due to a command duration limit being
exceeded. This new status is mapped to the ETIME error code to allow users
to differentiate "soft" duration limit failures from other more serious
hardware related errors.

If we compare BLK_STS_DURATION_LIMIT with BLK_STS_TIMEOUT:
-BLK_STS_DURATION_LIMIT means that the drive gave a reply indicating that
the command duration limit was exceeded before the command could be
completed. This I/O status is mapped to ETIME for user space.

-BLK_STS_TIMEOUT means that the drive never gave a reply at all.
This I/O status is mapped to ETIMEDOUT for user space.

Signed-off-by: default avatarDamien Le Moal <dlemoal@kernel.org>
Reviewed-by: default avatarHannes Reinecke <hare@suse.de>
Reviewed-by: default avatarChristoph Hellwig <hch@lst.de>
Co-developed-by: default avatarNiklas Cassel <niklas.cassel@wdc.com>
Signed-off-by: default avatarNiklas Cassel <niklas.cassel@wdc.com>
Link: https://lore.kernel.org/r/20230511011356.227789-4-nks@flawful.org


Signed-off-by: default avatarMartin K. Petersen <martin.petersen@oracle.com>
parent 6c913257

block/blk-core.c

+3 −0
Original line number Diff line number Diff line
@@ -170,6 +170,9 @@ static const struct { 
	[BLK_STS_ZONE_OPEN_RESOURCE]	= { -ETOOMANYREFS, "open zones exceeded" },

	[BLK_STS_ZONE_ACTIVE_RESOURCE]	= { -EOVERFLOW, "active zones exceeded" },



	/* Command duration limit device-side timeout */

	[BLK_STS_DURATION_LIMIT]	= { -ETIME, "duration limit exceeded" },



	/* everything else not covered above: */

	[BLK_STS_IOERR]		= { -EIO,	"I/O" },

};

include/linux/blk_types.h

+6 −0
Original line number Diff line number Diff line
@@ -171,6 +171,12 @@ typedef u16 blk_short_t; 
 */

#define BLK_STS_OFFLINE		((__force blk_status_t)17)



/*

 * BLK_STS_DURATION_LIMIT is returned from the driver when the target device

 * aborted the command because it exceeded one of its Command Duration Limits.

 */

#define BLK_STS_DURATION_LIMIT	((__force blk_status_t)18)



/**

 * blk_path_error - returns true if error may be path related

 * @error: status the request was completed with