diff options
| author | Nicholas Bellinger <nab@linux-iscsi.org> | 2012-11-15 11:02:49 -0800 |
|---|---|---|
| committer | Nicholas Bellinger <nab@linux-iscsi.org> | 2012-11-15 12:27:21 -0800 |
| commit | 773cbaf7460aa58c67d4dca83c3f8bca10323bbe (patch) | |
| tree | 91e6015ade8d62c34c64861f1f3810b3c15a6a25 /drivers/target/target_core_device.c | |
| parent | cd063bef414c51d79b9c6ea7a8ef8f9d319529bc (diff) | |
target: Add/check max_write_same_len device attribute + update block limits VPD
This patch adds a new max_write_same_len device attribute for use with
WRITE_SAME w/ UNMAP=0 backend emulation. This can be useful for
lowering the default backend value (IBLOCK uses 0xFFFF).
Also, update block limits VPD emulation code in spc_emulate_evpd_b0() to
report MAXIMUM WRITE SAME LENGTH, and enforce max_write_same_len during
sbc_parse() -> sbc_setup_write_same() CDB sanity checking for all emulated
WRITE_SAME w/ UNMAP=0 cases.
(Robert: Move max_write_same_len check in sbc_setup_write_same() to
check both WRITE_SAME w/ UNMAP=1 and w/ UNMAP=0 cases)
Cc: Christoph Hellwig <hch@lst.de>
Cc: Martin K. Petersen <martin.petersen@oracle.com>
Cc: Robert Elliott <Elliott@hp.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
Diffstat (limited to 'drivers/target/target_core_device.c')
| -rw-r--r-- | drivers/target/target_core_device.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/drivers/target/target_core_device.c b/drivers/target/target_core_device.c index 599374e6d24..54439bc42da 100644 --- a/drivers/target/target_core_device.c +++ b/drivers/target/target_core_device.c @@ -706,6 +706,16 @@ int se_dev_set_unmap_granularity_alignment( return 0; } +int se_dev_set_max_write_same_len( + struct se_device *dev, + u32 max_write_same_len) +{ + dev->dev_attrib.max_write_same_len = max_write_same_len; + pr_debug("dev[%p]: Set max_write_same_len: %u\n", + dev, dev->dev_attrib.max_write_same_len); + return 0; +} + int se_dev_set_emulate_dpo(struct se_device *dev, int flag) { if (flag != 0 && flag != 1) { @@ -1393,6 +1403,7 @@ struct se_device *target_alloc_device(struct se_hba *hba, const char *name) dev->dev_attrib.unmap_granularity = DA_UNMAP_GRANULARITY_DEFAULT; dev->dev_attrib.unmap_granularity_alignment = DA_UNMAP_GRANULARITY_ALIGNMENT_DEFAULT; + dev->dev_attrib.max_write_same_len = DA_MAX_WRITE_SAME_LEN; dev->dev_attrib.fabric_max_sectors = DA_FABRIC_MAX_SECTORS; dev->dev_attrib.optimal_sectors = DA_FABRIC_MAX_SECTORS; |