target: Remove transport_do_task_sg_chain() and associated detritus

Now that all fabrics are converted over to using se_cmd->t_data_sg
directly, we can drop the task sg chaining support.  With the modern
memory allocation in target core, task sg chaining is needless
overhead -- we would split up the main cmd sglist into pieces, and
then splice those pieces back together instead of just using the
original list directly.

Signed-off-by: Roland Dreier <roland@purestorage.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>

2 files changed, 0 insertions, 9 deletions

diff --git a/include/target/target_core_base.h b/include/target/target_core_base.h
index 6a02c99d54a5..8ec4e8232be4 100644
--- a/include/target/target_core_base.h
+++ b/include/target/target_core_base.h
@@ -572,7 +572,6 @@ struct se_cmd {
         unsigned char           *t_task_cdb;
         unsigned char           __t_task_cdb[TCM_MAX_COMMAND_SIZE];
         unsigned long long      t_task_lba;
-        u32                     t_tasks_sg_chained_no;
         atomic_t                t_fe_count;
         atomic_t                t_se_count;
         atomic_t                t_task_cdbs_left;
@@ -593,7 +592,6 @@ struct se_cmd {
         struct completion       t_transport_stop_comp;
         struct completion       transport_lun_fe_stop_comp;
         struct completion       transport_lun_stop_comp;
-        struct scatterlist      *t_tasks_sg_chained;
 
         struct work_struct      work;
 
diff --git a/include/target/target_core_fabric.h b/include/target/target_core_fabric.h
index 10c690809601..83734ccc982c 100644
--- a/include/target/target_core_fabric.h
+++ b/include/target/target_core_fabric.h
@@ -3,12 +3,6 @@
 
 struct target_core_fabric_ops {
         struct configfs_subsystem *tf_subsys;
-        /*
-         * Optional to signal struct se_task->task_sg[] padding entries
-         * for scatterlist chaining using transport_do_task_sg_link(),
-         * disabled by default
-         */
-        bool task_sg_chaining;
         char *(*get_fabric_name)(void);
         u8 (*get_fabric_proto_ident)(struct se_portal_group *);
         char *(*tpg_get_wwn)(struct se_portal_group *);
@@ -124,7 +118,6 @@ int	transport_generic_handle_cdb_map(struct se_cmd *);
 int     transport_generic_handle_data(struct se_cmd *);
 int     transport_generic_map_mem_to_cmd(struct se_cmd *cmd,
                 struct scatterlist *, u32, struct scatterlist *, u32);
-void    transport_do_task_sg_chain(struct se_cmd *);
 int     transport_generic_new_cmd(struct se_cmd *);
 
 void    transport_generic_process_write(struct se_cmd *);