From: Bart Van Assche <bvanassche@acm.org>
To: Jens Axboe <axboe@kernel.dk>
Cc: linux-block@vger.kernel.org, linux-scsi@vger.kernel.org,
"Martin K . Petersen" <martin.petersen@oracle.com>,
Christoph Hellwig <hch@lst.de>,
Bart Van Assche <bvanassche@acm.org>,
Damien Le Moal <dlemoal@kernel.org>,
Ming Lei <ming.lei@redhat.com>,
"James E.J. Bottomley" <jejb@linux.ibm.com>
Subject: [PATCH v14 11/19] scsi: sd_zbc: Only require an I/O scheduler if needed
Date: Mon, 23 Oct 2023 14:54:02 -0700 [thread overview]
Message-ID: <20231023215638.3405959-12-bvanassche@acm.org> (raw)
In-Reply-To: <20231023215638.3405959-1-bvanassche@acm.org>
An I/O scheduler that serializes zoned writes is only needed if the SCSI
LLD does not preserve the write order. Hence only set
ELEVATOR_F_ZBD_SEQ_WRITE if the LLD does not preserve the write order.
Reviewed-by: Damien Le Moal <dlemoal@kernel.org>
Cc: Martin K. Petersen <martin.petersen@oracle.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
---
drivers/scsi/sd_zbc.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/scsi/sd_zbc.c b/drivers/scsi/sd_zbc.c
index a25215507668..718b31bed878 100644
--- a/drivers/scsi/sd_zbc.c
+++ b/drivers/scsi/sd_zbc.c
@@ -955,7 +955,9 @@ int sd_zbc_read_zones(struct scsi_disk *sdkp, u8 buf[SD_BUF_SIZE])
/* The drive satisfies the kernel restrictions: set it up */
blk_queue_flag_set(QUEUE_FLAG_ZONE_RESETALL, q);
- blk_queue_required_elevator_features(q, ELEVATOR_F_ZBD_SEQ_WRITE);
+ if (!q->limits.driver_preserves_write_order)
+ blk_queue_required_elevator_features(q,
+ ELEVATOR_F_ZBD_SEQ_WRITE);
if (sdkp->zones_max_open == U32_MAX)
disk_set_max_open_zones(disk, 0);
else
next prev parent reply other threads:[~2023-10-23 21:57 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-10-23 21:53 [PATCH v14 00/19] Improve write performance for zoned UFS devices Bart Van Assche
2023-10-23 21:53 ` [PATCH v14 01/19] block: Introduce more member variables related to zone write locking Bart Van Assche
2023-10-23 21:53 ` [PATCH v14 02/19] block: Only use write locking if necessary Bart Van Assche
2023-10-23 23:29 ` Damien Le Moal
2023-10-23 21:53 ` [PATCH v14 03/19] block: Preserve the order of requeued zoned writes Bart Van Assche
2023-10-23 23:30 ` Damien Le Moal
2023-10-23 21:53 ` [PATCH v14 04/19] block/mq-deadline: Only use zone locking if necessary Bart Van Assche
2023-10-23 21:53 ` [PATCH v14 05/19] scsi: Add an argument to scsi_eh_flush_done_q() Bart Van Assche
2023-10-24 0:07 ` Damien Le Moal
2023-10-24 9:26 ` John Garry
2023-10-24 17:17 ` Bart Van Assche
2023-10-24 18:20 ` John Garry
2023-10-23 21:53 ` [PATCH v14 06/19] scsi: core: Introduce a mechanism for reordering requests in the error handler Bart Van Assche
2023-10-24 0:09 ` Damien Le Moal
2023-10-23 21:53 ` [PATCH v14 07/19] scsi: core: Add unit tests for scsi_call_prepare_resubmit() Bart Van Assche
2023-10-23 21:53 ` [PATCH v14 08/19] scsi: sd: Sort commands by LBA before resubmitting Bart Van Assche
2023-10-24 0:11 ` Damien Le Moal
2023-10-23 21:54 ` [PATCH v14 09/19] scsi: sd: Add a unit test for sd_cmp_sector() Bart Van Assche
2023-10-23 21:54 ` [PATCH v14 10/19] scsi: core: Retry unaligned zoned writes Bart Van Assche
2023-10-24 0:13 ` Damien Le Moal
2023-10-24 17:22 ` Bart Van Assche
2023-10-25 7:25 ` Damien Le Moal
2023-10-25 19:28 ` Bart Van Assche
2023-10-23 21:54 ` Bart Van Assche [this message]
2023-10-23 21:54 ` [PATCH v14 12/19] scsi: scsi_debug: Add the preserves_write_order module parameter Bart Van Assche
2023-10-24 0:13 ` Damien Le Moal
2023-10-24 17:25 ` Bart Van Assche
2023-10-23 21:54 ` [PATCH v14 13/19] scsi: scsi_debug: Support injecting unaligned write errors Bart Van Assche
2023-10-23 21:54 ` [PATCH v14 14/19] scsi: ufs: hisi: Rework the code that disables auto-hibernation Bart Van Assche
2023-10-23 21:54 ` [PATCH v14 15/19] scsi: ufs: Rename ufshcd_auto_hibern8_enable() and make it static Bart Van Assche
2023-10-23 21:54 ` [PATCH v14 16/19] scsi: ufs: Change the return type of ufshcd_auto_hibern8_update() Bart Van Assche
2023-10-23 21:54 ` [PATCH v14 17/19] scsi: ufs: Simplify ufshcd_auto_hibern8_update() Bart Van Assche
2023-10-23 21:54 ` [PATCH v14 18/19] scsi: ufs: Forbid auto-hibernation without I/O scheduler Bart Van Assche
2023-10-23 21:54 ` [PATCH v14 19/19] scsi: ufs: Inform the block layer about write ordering Bart Van Assche
2023-10-23 23:43 ` [PATCH v14 00/19] Improve write performance for zoned UFS devices Bart Van Assche
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