target: Implement mode page 0x1c, "Informational Exceptions"

The Windows SCSI compliance test asks for this mode page, and it's
easy to implement: we can just return all 0s to show we don't support
any of these features.

Signed-off-by: Roland Dreier <roland@purestorage.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>

1 files changed, 14 insertions, 0 deletions

diff --git a/drivers/target/target_core_spc.c b/drivers/target/target_core_spc.c
index 8ccfe00c51d7..6c10fce9ef09 100644
--- a/drivers/target/target_core_spc.c
+++ b/drivers/target/target_core_spc.c
@@ -760,6 +760,19 @@ out:
         return 20;
 }
 
+static int spc_modesense_informational_exceptions(struct se_device *dev, u8 pc, unsigned char *p)
+{
+        p[0] = 0x1c;
+        p[1] = 0x0a;
+
+        /* No changeable values for now */
+        if (pc == 1)
+                goto out;
+
+out:
+        return 12;
+}
+
 static struct {
         uint8_t         page;
         uint8_t         subpage;
@@ -768,6 +781,7 @@ static struct {
         { .page = 0x01, .subpage = 0x00, .emulate = spc_modesense_rwrecovery },
         { .page = 0x08, .subpage = 0x00, .emulate = spc_modesense_caching },
         { .page = 0x0a, .subpage = 0x00, .emulate = spc_modesense_control },
+        { .page = 0x1c, .subpage = 0x00, .emulate = spc_modesense_informational_exceptions },
 };
 
 static void spc_modesense_write_protect(unsigned char *buf, int type)