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authorAndy Grover <agrover@redhat.com>2011-07-20 19:28:46 +0000
committerNicholas Bellinger <nab@linux-iscsi.org>2011-07-22 09:37:48 +0000
commitec98f7825c6eaa4a9afb0eb518826efc8a2ed4a2 (patch)
treeb4ccee24db5d7d54ccfa5e3be2441d3a4e37f295 /include/target
parent3a86720567fd92819b449df10db85a2f73447d87 (diff)
downloadop-kernel-dev-ec98f7825c6eaa4a9afb0eb518826efc8a2ed4a2.zip
op-kernel-dev-ec98f7825c6eaa4a9afb0eb518826efc8a2ed4a2.tar.gz
target: Eliminate usage of struct se_mem
Both backstores and fabrics use arrays of struct scatterlist to describe data buffers. However TCM used struct se_mems, basically a linked list of scatterlist entries. We are able to simplify the code by eliminating this intermediate data structure and just using struct scatterlist[] throughout. Also, moved attachment of task to cmd out of transport_generic_get_task and into allocate_control_task and allocate_data_tasks. The reasoning is that it's nonintuitive that get_task should automatically add it to the cmd's task list -- it should just return an allocated, initialized task. That's all it should do, based on the function's name, so either the function shouldn't do it, or the name should change to encapsulate the entire essence of what it does. (nab: Fix compile warnings in tcm_fc, and make transport_kmap_first_data_page honor sg->offset for SGLs from contigious memory with TCM_Loop, and fix control se_cmd descriptor memory leak) Signed-off-by: Andy Grover <agrover@redhat.com> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
Diffstat (limited to 'include/target')
-rw-r--r--include/target/target_core_base.h10
1 files changed, 6 insertions, 4 deletions
diff --git a/include/target/target_core_base.h b/include/target/target_core_base.h
index d97618a..465f266 100644
--- a/include/target/target_core_base.h
+++ b/include/target/target_core_base.h
@@ -490,8 +490,6 @@ struct se_cmd {
int t_tasks_failed;
int t_tasks_fua;
bool t_tasks_bidi;
- u32 t_tasks_se_num;
- u32 t_tasks_se_bidi_num;
u32 t_tasks_sg_chained_no;
atomic_t t_fe_count;
atomic_t t_se_count;
@@ -523,9 +521,13 @@ struct se_cmd {
*/
struct scatterlist *t_task_pt_sgl;
u32 t_task_pt_sgl_num;
- struct list_head t_mem_list;
+
+ struct scatterlist *t_data_sg;
+ unsigned int t_data_nents;
+ struct scatterlist *t_bidi_data_sg;
+ unsigned int t_bidi_data_nents;
+
/* Used for BIDI READ */
- struct list_head t_mem_bidi_list;
struct list_head t_task_list;
u32 t_task_list_num;
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