diff options
| author | Jamie Pocas <jamie.pocas@emc.com> | 2015-11-29 23:44:57 +0100 |
|---|---|---|
| committer | Nicholas Bellinger <nab@linux-iscsi.org> | 2016-01-06 22:39:55 +0100 |
| commit | e6f41633cb79b55ead84b023c02035322c7827e7 (patch) | |
| tree | 342f55892f82d100f496c8ed73f3570c8d956842 /drivers/target/target_core_sbc.c | |
| parent | sbp-target: Remove a superfluous forward declaration (diff) | |
| download | linux-e6f41633cb79b55ead84b023c02035322c7827e7.tar.xz linux-e6f41633cb79b55ead84b023c02035322c7827e7.zip | |
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 <jamie.pocas@emc.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
Diffstat (limited to 'drivers/target/target_core_sbc.c')
| -rw-r--r-- | drivers/target/target_core_sbc.c | 10 |
1 files changed, 9 insertions, 1 deletions
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)); |