target: Disallow changing of WRITE cache/FUA attrs after export

Now that incoming FUA=1 bit check is enforced for backends with FUA or
WCE disabled, go ahead and disallow the changing of related backend
attributes when active fabric exports exist.

This is required to avoid potential failures with existing initiator
LUN registrations that have been previously created with FUA=1.

Reported-by: Christoph Hellwig <hch@lst.de>
Cc: Doug Gilbert <dgilbert@interlog.com>
Cc: James Bottomley <JBottomley@Parallels.com>
Cc: Ronnie Sahlberg <ronniesahlberg@gmail.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>

diff --git a/drivers/target/target_core_device.c b/drivers/target/target_core_device.c
index 58f49ff69b1424bf5feb33ed64eba495d8826851..37449bdd62f682e7cd802db42389a5668a7a95a4 100644 (file)
--- a/drivers/target/target_core_device.c
+++ b/drivers/target/target_core_device.c
@@ -767,6 +767,16 @@ int se_dev_set_emulate_fua_write(struct se_device *dev, int flag)
                pr_err("Illegal value %d\n", flag);
                return -EINVAL;
        }
+       if (flag &&
+           dev->transport->get_write_cache) {
+               pr_err("emulate_fua_write not supported for this device\n");
+               return -EINVAL;
+       }
+       if (dev->export_count) {
+               pr_err("emulate_fua_write cannot be changed with active"
+                      " exports: %d\n", dev->export_count);
+               return -EINVAL;
+       }
        dev->dev_attrib.emulate_fua_write = flag;
        pr_debug("dev[%p]: SE Device Forced Unit Access WRITEs: %d\n",
                        dev, dev->dev_attrib.emulate_fua_write);
@@ -801,7 +811,11 @@ int se_dev_set_emulate_write_cache(struct se_device *dev, int flag)
                pr_err("emulate_write_cache not supported for this device\n");
                return -EINVAL;
        }
-
+       if (dev->export_count) {
+               pr_err("emulate_write_cache cannot be changed with active"
+                      " exports: %d\n", dev->export_count);
+               return -EINVAL;
+       }
        dev->dev_attrib.emulate_write_cache = flag;
        pr_debug("dev[%p]: SE Device WRITE_CACHE_EMULATION flag: %d\n",
                        dev, dev->dev_attrib.emulate_write_cache);