From: Nicholas Bellinger <nab@xxxxxxxxxxxxxxx>
This patch adds an explicit check + failure for XCOPY I/O to source +
destination devices with a non-matching block_size.
This limitiation is currently due to the fact that the scatterlist
memory allocated for the XCOPY READ operation is passed zero-copy
to the XCOPY WRITE operation.
Reported-by: Thomas Glanzmann <thomas@xxxxxxxxxxxx>
Reported-by: Douglas Gilbert <dgilbert@xxxxxxxxxxxx>
Cc: Thomas Glanzmann <thomas@xxxxxxxxxxxx>
Cc: Douglas Gilbert <dgilbert@xxxxxxxxxxxx>
Signed-off-by: Nicholas Bellinger <nab@xxxxxxxxxxxxxxx>
---
drivers/target/target_core_xcopy.c | 14 +++++++++++++-
1 files changed, 13 insertions(+), 1 deletions(-)
diff --git a/drivers/target/target_core_xcopy.c b/drivers/target/target_core_xcopy.c
index 0e41143f..474cd44 100644
--- a/drivers/target/target_core_xcopy.c
+++ b/drivers/target/target_core_xcopy.c
@@ -893,6 +893,7 @@ sense_reason_t target_do_xcopy(struct se_cmd *se_cmd)
struct xcopy_op *xop = NULL;
unsigned char *p = NULL, *seg_desc;
unsigned int list_id, list_id_usage, sdll, inline_dl, sa;
+ sense_reason_t ret = TCM_INVALID_PARAMETER_LIST;
int rc;
unsigned short tdll;
@@ -944,6 +945,17 @@ sense_reason_t target_do_xcopy(struct se_cmd *se_cmd)
if (rc <= 0)
goto out;
+ if (xop->src_dev->dev_attrib.block_size !=
+ xop->dst_dev->dev_attrib.block_size) {
+ pr_err("XCOPY: Non matching src_dev block_size: %u + dst_dev"
+ " block_size: %u currently unsupported\n",
+ xop->src_dev->dev_attrib.block_size,
+ xop->dst_dev->dev_attrib.block_size);
+ xcopy_pt_undepend_remotedev(xop);
+ ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
+ goto out;
+ }
+
pr_debug("XCOPY: Processed %d target descriptors, length: %u\n", rc,
rc * XCOPY_TARGET_DESC_LEN);
seg_desc = &p[16];
@@ -966,7 +978,7 @@ out:
if (p)
transport_kunmap_data_sg(se_cmd);
kfree(xop);
- return TCM_INVALID_PARAMETER_LIST;
+ return ret;
}
static sense_reason_t target_rcr_operating_parameters(struct se_cmd *se_cmd)
--
1.7.2.5
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