Re: [Scst-devel] How to disable VAAI in scst?

[Bart V. A. <bar...@sa...>]

On 04/03/15 10:39, Tommy Li wrote:
> I need disable VAAI feature. Could please tell me how to do that?

Hello Tommy,

Are you using one of the scst_vdisk handlers or SCSI pass-through ?
If you are using one of the scst_vdisk handlers, applying the
(untested) patch below, rebuilding and reinstalling SCST should be
sufficient:

diff --git a/scst/src/dev_handlers/scst_vdisk.c b/scst/src/dev_handlers/scst_vdisk.c
index bcd9f14..6a17aa5 100644
--- a/scst/src/dev_handlers/scst_vdisk.c
+++ b/scst/src/dev_handlers/scst_vdisk.c
@@ -2152,9 +2152,6 @@ static const struct scst_opcode_descriptor scst_op_descr_read_toc = {
        [READ_CAPACITY] = vdisk_exec_read_capacity,                     \
        [SERVICE_ACTION_IN] = vdisk_exec_srv_action_in,                 \
        [UNMAP] = vdisk_exec_unmap,                                     \
-       [WRITE_SAME] = vdisk_exec_write_same,                           \
-       [WRITE_SAME_16] = vdisk_exec_write_same,                        \
-       [COMPARE_AND_WRITE] = vdisk_exec_caw,                           \
        [ORWRITE_16] = vdisk_exec_orwrite,                              \
        [MAINTENANCE_IN] = vdisk_exec_maintenance_in,                   \
        [SEND_DIAGNOSTIC] = vdisk_exec_send_diagnostic,                 \

Bart.