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Fix WRITE SAME data buffer length handling

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From the SPC-4 paragraph about WRITE SAME(10): "The WRITE SAME (10)
command requests that the device server transfer a single logical
block from the Data-Out Buffer [ ... ]". Hence always pass a data
buffer when sending a WRITE SAME(10) command.

Set the NDOB bit in the WRITE SAME(16) command if no data out buffer
is present.

Signed-off-by: Bart Van Assche <bvanassche@acm.org>
This commit is contained in:
Bart Van Assche
2014-08-18 08:37:30 +02:00
committed by Ronnie Sahlberg
parent e8c4be8f62
commit ded75ae18a
6 changed files with 22 additions and 15 deletions
Download Patch File Download Diff File Expand all files Collapse all files

6
lib/iscsi-command.c
View File

@@ -1518,7 +1518,8 @@ iscsi_writesame10_task(struct iscsi_context *iscsi, int lun, uint32_t lba,
struct scsi_task *task;
struct iscsi_data d;
task = scsi_cdb_writesame10(wrprotect, anchor, unmap, lba, group, num_blocks);
task = scsi_cdb_writesame10(wrprotect, anchor, unmap, lba, group,
num_blocks, datalen);
if (task == NULL) {
iscsi_set_error(iscsi, "Out-of-memory: Failed to create "
"writesame10 cdb.");
@@ -1551,7 +1552,8 @@ iscsi_writesame16_task(struct iscsi_context *iscsi, int lun, uint64_t lba,
struct scsi_task *task;
struct iscsi_data d;
task = scsi_cdb_writesame16(wrprotect, anchor, unmap, lba, group, num_blocks);
task = scsi_cdb_writesame16(wrprotect, anchor, unmap, lba, group,
num_blocks, datalen);
if (task == NULL) {
iscsi_set_error(iscsi, "Out-of-memory: Failed to create "
"writesame16 cdb.");

11
lib/scsi-lowlevel.c
View File

@@ -2106,7 +2106,7 @@ err:
* WRITE_SAME10
*/
struct scsi_task *
scsi_cdb_writesame10(int wrprotect, int anchor, int unmap, uint32_t lba, int group, uint16_t num_blocks)
scsi_cdb_writesame10(int wrprotect, int anchor, int unmap, uint32_t lba, int group, uint16_t num_blocks, uint32_t datalen)
{
struct scsi_task *task;
@@ -2135,7 +2135,7 @@ scsi_cdb_writesame10(int wrprotect, int anchor, int unmap, uint32_t lba, int gro
task->cdb_size = 10;
task->xfer_dir = SCSI_XFER_WRITE;
task->expxferlen = 512;
task->expxferlen = datalen;
return task;
}
@@ -2144,7 +2144,7 @@ scsi_cdb_writesame10(int wrprotect, int anchor, int unmap, uint32_t lba, int gro
* WRITE_SAME16
*/
struct scsi_task *
scsi_cdb_writesame16(int wrprotect, int anchor, int unmap, uint64_t lba, int group, uint32_t num_blocks)
scsi_cdb_writesame16(int wrprotect, int anchor, int unmap, uint64_t lba, int group, uint32_t num_blocks, uint32_t datalen)
{
struct scsi_task *task;
@@ -2165,6 +2165,9 @@ scsi_cdb_writesame16(int wrprotect, int anchor, int unmap, uint64_t lba, int gro
if (unmap) {
task->cdb[1] |= 0x08;
}
if (datalen == 0) {
task->cdb[1] |= 0x01;
}
scsi_set_uint32(&task->cdb[2], lba >> 32);
scsi_set_uint32(&task->cdb[6], lba & 0xffffffff);
scsi_set_uint32(&task->cdb[10], num_blocks);
@@ -2174,7 +2177,7 @@ scsi_cdb_writesame16(int wrprotect, int anchor, int unmap, uint64_t lba, int gro
task->cdb_size = 16;
task->xfer_dir = SCSI_XFER_WRITE;
task->expxferlen = 512;
task->expxferlen = datalen;
return task;
}