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_spc.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_spc.c')
| -rw-r--r-- | drivers/target/target_core_spc.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/drivers/target/target_core_spc.c b/drivers/target/target_core_spc.c index 4b3c18305ec..cf1b8bb310c 100644 --- a/drivers/target/target_core_spc.c +++ b/drivers/target/target_core_spc.c @@ -465,7 +465,7 @@ spc_emulate_evpd_b0(struct se_cmd *cmd, unsigned char *buf) * Exit now if we don't support TP. */ if (!have_tp) - return 0; + goto max_write_same; /* * Set MAXIMUM UNMAP LBA COUNT @@ -491,6 +491,12 @@ spc_emulate_evpd_b0(struct se_cmd *cmd, unsigned char *buf) if (dev->dev_attrib.unmap_granularity_alignment != 0) buf[32] |= 0x80; /* Set the UGAVALID bit */ + /* + * MAXIMUM WRITE SAME LENGTH + */ +max_write_same: + put_unaligned_be64(dev->dev_attrib.max_write_same_len, &buf[36]); + return 0; } |