path: root/Documentation
diff options
Diffstat (limited to 'Documentation')
1 files changed, 7 insertions, 11 deletions
diff --git a/Documentation/target/tcmu-design.txt b/Documentation/target/tcmu-design.txt
index 43e94ea6d2ca..c80bf1ed8981 100644
--- a/Documentation/target/tcmu-design.txt
+++ b/Documentation/target/tcmu-design.txt
@@ -15,7 +15,7 @@ Contents:
a) Discovering and configuring TCMU uio devices
b) Waiting for events on the device(s)
c) Managing the command ring
-3) Command filtering and pass_level
+3) Command filtering
4) A final note
@@ -360,17 +360,13 @@ int handle_device_events(int fd, void *map)
-Command filtering and pass_level
+Command filtering
-TCMU supports a "pass_level" option with valid values of 0 or 1. When
-the value is 0 (the default), nearly all SCSI commands received for
-the device are passed through to the handler. This allows maximum
-flexibility but increases the amount of code required by the handler,
-to support all mandatory SCSI commands. If pass_level is set to 1,
-then only IO-related commands are presented, and the rest are handled
-by LIO's in-kernel command emulation. The commands presented at level
-1 include all versions of:
+Initial TCMU support is for a filtered commandset. Only IO-related
+commands are presented to userspace, and the rest are handled by LIO's
+in-kernel command emulation. The commands presented are all versions