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authorNicholas Bellinger <nab@linux-iscsi.org>2012-11-15 11:02:49 -0800
committerNicholas Bellinger <nab@linux-iscsi.org>2012-11-15 12:27:21 -0800
commit773cbaf7460aa58c67d4dca83c3f8bca10323bbe (patch)
tree91e6015ade8d62c34c64861f1f3810b3c15a6a25 /drivers/target/target_core_configfs.c
parentcd063bef414c51d79b9c6ea7a8ef8f9d319529bc (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_configfs.c')
-rw-r--r--drivers/target/target_core_configfs.c4
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,
};