This is a note to let you know that I've just added the patch titled scsi: sd: Do not override max_sectors_kb sysfs setting to the 4.4-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: scsi-sd-do-not-override-max_sectors_kb-sysfs-setting.patch and it can be found in the queue-4.4 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From 77082ca503bed061f7fbda7cfd7c93beda967a41 Mon Sep 17 00:00:00 2001 From: "Martin K. Petersen" <martin.petersen@xxxxxxxxxx> Date: Wed, 27 Sep 2017 21:38:59 -0400 Subject: scsi: sd: Do not override max_sectors_kb sysfs setting From: Martin K. Petersen <martin.petersen@xxxxxxxxxx> commit 77082ca503bed061f7fbda7cfd7c93beda967a41 upstream. A user may lower the max_sectors_kb setting in sysfs to accommodate certain workloads. Previously we would always set the max I/O size to either the block layer default or the optional preferred I/O size reported by the device. Keep the current heuristics for the initial setting of max_sectors_kb. For subsequent invocations, only update the current queue limit if it exceeds the capabilities of the hardware. Reported-by: Don Brace <don.brace@xxxxxxxxxxxxx> Reviewed-by: Martin Wilck <mwilck@xxxxxxxx> Tested-by: Don Brace <don.brace@xxxxxxxxxxxxx> Signed-off-by: Martin K. Petersen <martin.petersen@xxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/scsi/sd.c | 19 ++++++++++++++----- 1 file changed, 14 insertions(+), 5 deletions(-) --- a/drivers/scsi/sd.c +++ b/drivers/scsi/sd.c @@ -2878,8 +2878,6 @@ static int sd_revalidate_disk(struct gen sd_read_write_same(sdkp, buffer); } - sdkp->first_scan = 0; - /* * We now have all cache related info, determine how we deal * with flush requests. @@ -2894,7 +2892,7 @@ static int sd_revalidate_disk(struct gen q->limits.max_dev_sectors = logical_to_sectors(sdp, dev_max); /* - * Use the device's preferred I/O size for reads and writes + * Determine the device's preferred I/O size for reads and writes * unless the reported value is unreasonably small, large, or * garbage. */ @@ -2908,8 +2906,19 @@ static int sd_revalidate_disk(struct gen rw_max = min_not_zero(logical_to_sectors(sdp, dev_max), (sector_t)BLK_DEF_MAX_SECTORS); - /* Combine with controller limits */ - q->limits.max_sectors = min(rw_max, queue_max_hw_sectors(q)); + /* Do not exceed controller limit */ + rw_max = min(rw_max, queue_max_hw_sectors(q)); + + /* + * Only update max_sectors if previously unset or if the current value + * exceeds the capabilities of the hardware. + */ + if (sdkp->first_scan || + q->limits.max_sectors > q->limits.max_dev_sectors || + q->limits.max_sectors > q->limits.max_hw_sectors) + q->limits.max_sectors = rw_max; + + sdkp->first_scan = 0; set_capacity(disk, logical_to_sectors(sdp, sdkp->capacity)); sd_config_write_same(sdkp); Patches currently in stable-queue which might be from martin.petersen@xxxxxxxxxx are queue-4.4/scsi-sd-do-not-override-max_sectors_kb-sysfs-setting.patch