From e6f41633cb79b55ead84b023c02035322c7827e7 Mon Sep 17 00:00:00 2001 From: Jamie Pocas Date: Sun, 29 Nov 2015 14:44:57 -0800 Subject: target/sbc: Add LBPRZ attribute + control CDB emulation This change sets the LBPRZ flag in EVPD page b2h and READ CAPACITY (16) based on a new unmap_zeroes_data device attribute. This flag is set automatically for iblock based on underlying block device queue's discard_zeroes_data flag. Signed-off-by: Jamie Pocas Signed-off-by: Nicholas Bellinger --- drivers/target/target_core_sbc.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) (limited to 'drivers/target/target_core_sbc.c') diff --git a/drivers/target/target_core_sbc.c b/drivers/target/target_core_sbc.c index 0b4b2a67d9f9..b83ac3766fe7 100644 --- a/drivers/target/target_core_sbc.c +++ b/drivers/target/target_core_sbc.c @@ -141,9 +141,17 @@ sbc_emulate_readcapacity_16(struct se_cmd *cmd) * Set Thin Provisioning Enable bit following sbc3r22 in section * READ CAPACITY (16) byte 14 if emulate_tpu or emulate_tpws is enabled. */ - if (dev->dev_attrib.emulate_tpu || dev->dev_attrib.emulate_tpws) + if (dev->dev_attrib.emulate_tpu || dev->dev_attrib.emulate_tpws) { buf[14] |= 0x80; + /* + * LBPRZ signifies that zeroes will be read back from an LBA after + * an UNMAP or WRITE SAME w/ unmap bit (sbc3r36 5.16.2) + */ + if (dev->dev_attrib.unmap_zeroes_data) + buf[14] |= 0x40; + } + rbuf = transport_kmap_data_sg(cmd); if (rbuf) { memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length)); -- cgit v1.2.3