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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 /include/target/target_core_base.h | |
| parent | target/sbc: Seperate WRITE_SAME based on UNMAP flag in sbc_ops (diff) | |
| download | linux-dev-773cbaf7460aa58c67d4dca83c3f8bca10323bbe.tar.xz linux-dev-773cbaf7460aa58c67d4dca83c3f8bca10323bbe.zip | |
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/target_core_base.h')
| -rw-r--r-- | include/target/target_core_base.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/include/target/target_core_base.h b/include/target/target_core_base.h index 5350f6e580f0..645d90ac6097 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; }; |