Commit 40e9cd4a authored by Stefan Haberland's avatar Stefan Haberland Committed by Jens Axboe
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s390/dasd: Move quiesce state with pprc swap 



Quiesce and resume is a mechanism to suspend operations on DASD devices.
In the context of a controlled copy pair swap operation, the quiesce
operation is usually issued before the actual swap and a resume
afterwards.

During the swap operation, the underlying device is exchanged. Therefore,
the quiesce flag must be moved to the secondary device to ensure a
consistent quiesce state after the swap.

The secondary device itself cannot be suspended separately because there
is no separate block device representation for it.

Fixes: 413862ca ("s390/dasd: add copy pair swap capability")
Cc: stable@vger.kernel.org #6.1
Reviewed-by: default avatarJan Hoeppner <hoeppner@linux.ibm.com>
Signed-off-by: default avatarStefan Haberland <sth@linux.ibm.com>
Link: https://patch.msgid.link/20260310142330.4080106-2-sth@linux.ibm.com


Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent 155a3bed

drivers/s390/block/dasd_eckd.c

+5 −0
Original line number Diff line number Diff line
@@ -6182,6 +6182,11 @@ static int dasd_eckd_copy_pair_swap(struct dasd_device *device, char *prim_busid 
			dev_name(&secondary->cdev->dev), rc);

	}



	if (primary->stopped & DASD_STOPPED_QUIESCE) {

		dasd_device_set_stop_bits(secondary, DASD_STOPPED_QUIESCE);

		dasd_device_remove_stop_bits(primary, DASD_STOPPED_QUIESCE);

	}



	/* re-enable device */

	dasd_device_remove_stop_bits(primary, DASD_STOPPED_PPRC);

	dasd_device_remove_stop_bits(secondary, DASD_STOPPED_PPRC);