target: Update QUEUE ALGORITHM MODIFIER control page default

This patch adds the default 'Unrestricted reordering allowed' for SCSI
control mode page QUEUE ALGORITHM MODIFIER on a per se_device basis in
target_modesense_control() following spc4r23.  This includes a new
emuluate_rest_reord configfs attribute that currently (only) accepts
zero to signal 'Unrestricted reordering allowed' in control mode page
usage by the backend target device.

Reported-by: Roland Dreier <roland@purestorage.com>
Signed-off-by: Nicholas Bellinger <nab@risingtidesystems.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/drivers/target/target_core_configfs.c b/drivers/target/target_core_configfs.c
index e56c39daeec6..a92176d2e187 100644
--- a/drivers/target/target_core_configfs.c
+++ b/drivers/target/target_core_configfs.c
@@ -701,6 +701,9 @@ SE_DEV_ATTR(enforce_pr_isids, S_IRUGO | S_IWUSR);
 DEF_DEV_ATTRIB(is_nonrot);
 SE_DEV_ATTR(is_nonrot, S_IRUGO | S_IWUSR);
 
+DEF_DEV_ATTRIB(emulate_rest_reord);
+SE_DEV_ATTR(emulate_rest_reord, S_IRUGO | S_IWUSR);
+
 DEF_DEV_ATTRIB_RO(hw_block_size);
 SE_DEV_ATTR_RO(hw_block_size);
 
@@ -750,6 +753,7 @@ static struct configfs_attribute *target_core_dev_attrib_attrs[] = {
         &target_core_dev_attrib_emulate_tpws.attr,
         &target_core_dev_attrib_enforce_pr_isids.attr,
         &target_core_dev_attrib_is_nonrot.attr,
+        &target_core_dev_attrib_emulate_rest_reord.attr,
         &target_core_dev_attrib_hw_block_size.attr,
         &target_core_dev_attrib_block_size.attr,
         &target_core_dev_attrib_hw_max_sectors.attr,