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BACKPORT: FROMLIST: block: Introduce the flag QUEUE_FLAG_NO_ZONE_WRITE_LOCK

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Writes in sequential write required zones must happen at the write
pointer. Even if the submitter of the write commands (e.g. a filesystem)
submits writes for sequential write required zones in order, the block
layer or the storage controller may reorder these write commands.

The zone locking mechanism in the mq-deadline I/O scheduler serializes
write commands for sequential zones. Some but not all storage controllers
require this serialization. Introduce a new request queue flag to allow
block drivers to indicate that they preserve the order of write commands
and thus do not require serialization of writes per zone.

Reviewed-by: Damien Le Moal <dlemoal@kernel.org>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Ming Lei <ming.lei@redhat.com>
Change-Id: Ibf578f0ec92074ccc2c11d2c24c8d6309294bc8c
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Bug: 234829282
Link: https://lore.kernel.org/linux-block/20230804154821.3232094-1-bvanassche@acm.org/T/#m539c093dff4322599af97bccea975f73f3f67013
Signed-off-by: Bart Van Assche <bvanassche@google.com>
This commit is contained in:
Bart Van Assche
2023-01-09 15:27:33 -08:00
committed by Bart Van Assche
parent d01888a968
commit 5414ea3f50
1 changed files with 11 additions and 0 deletions
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11
include/linux/blkdev.h
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@@ -603,6 +603,12 @@ struct request_queue {
#define QUEUE_FLAG_RQ_ALLOC_TIME 27 /* record rq->alloc_time_ns */
#define QUEUE_FLAG_HCTX_ACTIVE 28 /* at least one blk-mq hctx is active */
#define QUEUE_FLAG_NOWAIT 29 /* device supports NOWAIT */
/*
* The device supports not using the zone write locking mechanism to serialize
* write operations (REQ_OP_WRITE, REQ_OP_WRITE_ZEROES) issued to a sequential
* write required zone (BLK_ZONE_TYPE_SEQWRITE_REQ).
*/
#define QUEUE_FLAG_NO_ZONE_WRITE_LOCK 30
#define QUEUE_FLAG_MQ_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \
(1 << QUEUE_FLAG_SAME_COMP) | \
@@ -650,6 +656,11 @@ bool blk_queue_flag_test_and_set(unsigned int flag, struct request_queue *q);
#define blk_queue_registered(q) test_bit(QUEUE_FLAG_REGISTERED, &(q)->queue_flags)
#define blk_queue_nowait(q) test_bit(QUEUE_FLAG_NOWAIT, &(q)->queue_flags)
static inline bool blk_queue_no_zone_write_lock(struct request_queue *q)
{
return test_bit(QUEUE_FLAG_NO_ZONE_WRITE_LOCK, &q->queue_flags);
}
extern void blk_set_pm_only(struct request_queue *q);
extern void blk_clear_pm_only(struct request_queue *q);