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target: Remove transport_do_task_sg_chain() and associated detritus

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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>
This commit is contained in:
Roland Dreier
2012-03-30 11:29:15 -07:00
committed by Nicholas Bellinger
parent 6f9e7f01b6
commit 957525a242
3 changed files with 0 additions and 79 deletions
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include/target/target_core_base.h
-2
View File
@@ -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;
include/target/target_core_fabric.h
-7
View File
@@ -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 *);