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Libiscsi: add support for EXTENDED COPY

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Build on existing scsi_cdb_extended_copy() functionality. This operation
can be used to offload inter and intra LU copies to the target.

The API is rather primitive, in that the caller needs to construct the
parameter buffer, including CSCD and segment descriptor lists, etc.

Signed-off-by: David Disseldorp <ddiss@suse.de>
This commit is contained in:
David Disseldorp
2017-01-03 23:58:20 +01:00
parent f475436c5a
commit 4bc5f962e2
5 changed files with 56 additions and 0 deletions
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9
include/iscsi.h
View File

@@ -1134,6 +1134,11 @@ iscsi_receive_copy_results_task(struct iscsi_context *iscsi, int lun,
int sa, int list_id, int alloc_len,
iscsi_command_cb cb, void *private_data);
EXTERN struct scsi_task *
iscsi_extended_copy_task(struct iscsi_context *iscsi, int lun,
struct iscsi_data *param_data,
iscsi_command_cb cb, void *private_data);
/*
* Sync commands for SCSI
*/
@@ -1459,6 +1464,10 @@ iscsi_report_supported_opcodes_sync(struct iscsi_context *iscsi, int lun,
int opcode, int sa,
uint32_t alloc_len);
EXTERN struct scsi_task *
iscsi_extended_copy_sync(struct iscsi_context *iscsi, int lun,
struct iscsi_data *param_data);
EXTERN struct scsi_task *
iscsi_receive_copy_results_sync(struct iscsi_context *iscsi, int lun,
int sa, int list_id, int alloc_len);

23
lib/iscsi-command.c
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@@ -2634,6 +2634,29 @@ iscsi_receive_copy_results_task(struct iscsi_context *iscsi, int lun,
return task;
}
struct scsi_task *
iscsi_extended_copy_task(struct iscsi_context *iscsi, int lun,
struct iscsi_data *param_data,
iscsi_command_cb cb, void *private_data)
{
struct scsi_task *task;
task = scsi_cdb_extended_copy(param_data->size);
if (task == NULL) {
iscsi_set_error(iscsi, "Out-of-memory: Failed to create "
"EXTENDED COPY cdb.");
return NULL;
}
if (iscsi_scsi_command_async(iscsi, lun, task, cb,
param_data, private_data) != 0) {
scsi_free_scsi_task(task);
return NULL;
}
return task;
}
struct scsi_task *
iscsi_scsi_get_task_from_pdu(struct iscsi_pdu *pdu)
{

2
lib/libiscsi.def
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@@ -83,6 +83,8 @@ iscsi_release6_sync
iscsi_release6_task
iscsi_report_supported_opcodes_sync
iscsi_report_supported_opcodes_task
iscsi_extended_copy_sync
iscsi_extended_copy_task
iscsi_receive_copy_results_sync
iscsi_receive_copy_results_task
iscsi_reconnect

2
lib/libiscsi.syms
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@@ -81,6 +81,8 @@ iscsi_release6_sync
iscsi_release6_task
iscsi_report_supported_opcodes_sync
iscsi_report_supported_opcodes_task
iscsi_extended_copy_sync
iscsi_extended_copy_task
iscsi_receive_copy_results_sync
iscsi_receive_copy_results_task
iscsi_reconnect

20
lib/sync.c
View File

@@ -1687,6 +1687,26 @@ iscsi_receive_copy_results_sync(struct iscsi_context *iscsi, int lun,
return state.task;
}
struct scsi_task *
iscsi_extended_copy_sync(struct iscsi_context *iscsi, int lun,
struct iscsi_data *param_data)
{
struct iscsi_sync_state state;
memset(&state, 0, sizeof(state));
if (iscsi_extended_copy_task(iscsi, lun, param_data,
scsi_sync_cb, &state) == NULL) {
iscsi_set_error(iscsi, "Failed to send EXTENDED COPY"
" command");
return NULL;
}
event_loop(iscsi, &state);
return state.task;
}
struct scsi_task *
iscsi_scsi_command_sync(struct iscsi_context *iscsi, int lun,
struct scsi_task *task, struct iscsi_data *data)