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Commit 6362f0a2 authored by Jens Axboe's avatar Jens Axboe Committed by Tejun Heo
Browse files

libata: add command iterator helpers 



Now that we have the internal tag as a special (higher) value tag,
it gets a bit tricky to iterate the internal commands as some loops
will exceed ATA_MAX_QUEUE. Add explicit helpers for iterating pending
commands, both inflight and internal.

Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
Signed-off-by: default avatarTejun Heo <tj@kernel.org>
parent 95ffcf47

include/linux/libata.h

+23 −0
Original line number Diff line number Diff line
@@ -1495,6 +1495,29 @@ static inline bool ata_tag_valid(unsigned int tag) 
	return tag < ATA_MAX_QUEUE || ata_tag_internal(tag);

}



#define __ata_qc_for_each(ap, qc, tag, max_tag, fn)		\

	for ((tag) = 0; (tag) < (max_tag) &&			\

	     ({ qc = fn((ap), (tag)); 1; }); (tag)++)		\



/*

 * Internal use only, iterate commands ignoring error handling and

 * status of 'qc'.

 */

#define ata_qc_for_each_raw(ap, qc, tag)					\

	__ata_qc_for_each(ap, qc, tag, ATA_MAX_QUEUE, __ata_qc_from_tag)



/*

 * Iterate all potential commands that can be queued

 */

#define ata_qc_for_each(ap, qc, tag)					\

	__ata_qc_for_each(ap, qc, tag, ATA_MAX_QUEUE, ata_qc_from_tag)



/*

 * Like ata_qc_for_each, but with the internal tag included

 */

#define ata_qc_for_each_with_internal(ap, qc, tag)			\

	__ata_qc_for_each(ap, qc, tag, ATA_MAX_QUEUE + 1, ata_qc_from_tag)



/*

 * device helpers

 */