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| 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_configfs.c | |
| parent | cd063bef414c51d79b9c6ea7a8ef8f9d319529bc (diff) | |
| download | linux-773cbaf7460aa58c67d4dca83c3f8bca10323bbe.tar.bz2 | |
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_configfs.c')
| -rw-r--r-- | drivers/target/target_core_configfs.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/target/target_core_configfs.c b/drivers/target/target_core_configfs.c index 7b473b66da7b..2b141643f06e 100644 --- a/drivers/target/target_core_configfs.c +++ b/drivers/target/target_core_configfs.c @@ -676,6 +676,9 @@ SE_DEV_ATTR(unmap_granularity, S_IRUGO | S_IWUSR); DEF_DEV_ATTRIB(unmap_granularity_alignment); SE_DEV_ATTR(unmap_granularity_alignment, S_IRUGO | S_IWUSR); +DEF_DEV_ATTRIB(max_write_same_len); +SE_DEV_ATTR(max_write_same_len, S_IRUGO | S_IWUSR); + CONFIGFS_EATTR_OPS(target_core_dev_attrib, se_dev_attrib, da_group); static struct configfs_attribute *target_core_dev_attrib_attrs[] = { @@ -701,6 +704,7 @@ static struct configfs_attribute *target_core_dev_attrib_attrs[] = { &target_core_dev_attrib_max_unmap_block_desc_count.attr, &target_core_dev_attrib_unmap_granularity.attr, &target_core_dev_attrib_unmap_granularity_alignment.attr, + &target_core_dev_attrib_max_write_same_len.attr, NULL, }; |