From: Nicholas Bellinger <nab@xxxxxxxxxxxxxxx> Greetings all, This series adds initial support for WRITE_SAME_16 w/ UNMAP=1 emulation into TCM/IBLOCK and TCM/FILEIO subsystem plugins using generic Block Discard logic. This also includes proper TCM/pSCSI passthrough support to handle all possible flavours of WRITE_SAME_16 for underlying HW that supports it. The main items to note here for the IBLOCK+FILEIO emulated (eg: not passthrough) case are: *) WRITE_SAME_16 w/ PBDATA and LBDATA will return INVALID_FIELD_IN_CDB *) WRITE_SAME_16 w/o UNMAP=1 will return INVALID_FIELD_IN_CDB *) WRITE_SAME_16 w/ UNMAP=1 will make IBLOCK+FILEIO call transport_generic_write_same(), and not actually write the received payload. The first patch adds the main WRITE_SAME_16 pieces into TCM_Core, adds the new emulate_tpws device attribute, and updates Block Limits VPD, Thin Provisioning VPD and READ_CAPACITY_* to take emulate_tpws=1 into account to signal/handle SBC-3 TPE=1 operation. The second patch adds support into IBLOCK + FILEIO for using the TCM Core provided transport_generic_write_same(), and will set both DEV_ATTRIB(dev)->emulate_tp[ws,u]=1 when blk_queue_discard()==1 signals underlying HW supports some flavour of TPE. So far this series been tested with TCM_Loop -> (IBLOCK,FILEIO,pSCSI) -> scsi_debug on v2.6.36-rc6 using explict 'sg_write_same -S' callers via SG_IO. Once again, many thanks to mkp for sharing his knowledge of this area! Signed-off-by: Nicholas A. Bellinger <nab@xxxxxxxxxxxxxxx> Nicholas Bellinger (2): tcm: Add WRITE_SAME_16 emulation and passthrough support tcm/iblock,fileio: Add WRITE_SAME_16 w/ UNMAP=1 bit support drivers/target/target_core_configfs.c | 4 + drivers/target/target_core_device.c | 15 +++++- drivers/target/target_core_file.c | 47 +++++++++++++++- drivers/target/target_core_iblock.c | 21 +++++++- drivers/target/target_core_transport.c | 99 ++++++++++++++++++++++++++++++-- include/target/target_core_base.h | 5 +- include/target/target_core_device.h | 1 + include/target/target_core_transport.h | 6 ++ 8 files changed, 189 insertions(+), 9 deletions(-) -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
