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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 /include/target
parentcd063bef414c51d79b9c6ea7a8ef8f9d319529bc (diff)
downloadvexpress-lsk-773cbaf7460aa58c67d4dca83c3f8bca10323bbe.tar.gz
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 'include/target')
-rw-r--r--include/target/target_core_base.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/include/target/target_core_base.h b/include/target/target_core_base.h
index 5350f6e580f..645d90ac609 100644
--- a/include/target/target_core_base.h
+++ b/include/target/target_core_base.h
@@ -71,6 +71,8 @@
#define DA_UNMAP_GRANULARITY_DEFAULT 0
/* Default unmap_granularity_alignment */
#define DA_UNMAP_GRANULARITY_ALIGNMENT_DEFAULT 0
+/* Default max_write_same_len, disabled by default */
+#define DA_MAX_WRITE_SAME_LEN 0
/* Default max transfer length */
#define DA_FABRIC_MAX_SECTORS 8192
/* Emulation for Direct Page Out */
@@ -609,6 +611,7 @@ struct se_dev_attrib {
u32 max_unmap_block_desc_count;
u32 unmap_granularity;
u32 unmap_granularity_alignment;
+ u32 max_write_same_len;
struct se_device *da_dev;
struct config_group da_group;
};