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Date: Fri, 10 Sep 2010 02:26:45 -0700
From: "Nicholas A. Bellinger" <nab@...ux-iscsi.org>
To: linux-scsi <linux-scsi@...r.kernel.org>,
linux-kernel <linux-kernel@...r.kernel.org>,
Joe Eykholt <jeykholt@...co.com>
Cc: Christoph Hellwig <hch@....de>,
FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>,
Mike Christie <michaelc@...wisc.edu>,
Hannes Reinecke <hare@...e.de>,
James Bottomley <James.Bottomley@...e.de>,
Konrad Rzeszutek Wilk <konrad@...nok.org>,
Boaz Harrosh <bharrosh@...asas.com>,
Richard Sharpe <realrichardsharpe@...il.com>,
Nicholas Bellinger <nab@...ux-iscsi.org>
Subject: [PATCH 2/4] tcm_loop: Convert to pre-allocated struct se_cmd descriptors
From: Nicholas Bellinger <nab@...ux-iscsi.org>
This patch converts the TCM_Loop fabric module to use pre-allocated struct se_cmd
descriptors and sense data buffer located at struct tcm_loop_cmd->tl_se_cmd and
struct tcm_loop_cmd->tl_sense_buf respectively.
This includes updating tcm_loop_allocate_core_cmd() to use transport_init_se_cmd()
for the main tcm_loop_queuecommand() entry point, as well as the same conversion
in tcm_loop_device_reset() for TMR LUN_RESET.
This also includes the conversion of a number of functions to use container_of()
instead of struct se_cmd->se_fabric_cmd_ptr to locate the struct tcm_loop_cmd *.
Signed-off-by: Nicholas A. Bellinger <nab@...ux-iscsi.org>
---
drivers/target/tcm_loop/tcm_loop_core.h | 6 ++-
drivers/target/tcm_loop/tcm_loop_fabric.c | 12 ++++----
drivers/target/tcm_loop/tcm_loop_fabric_scsi.c | 37 +++++++++++-------------
3 files changed, 27 insertions(+), 28 deletions(-)
diff --git a/drivers/target/tcm_loop/tcm_loop_core.h b/drivers/target/tcm_loop/tcm_loop_core.h
index 69906b7..821d73c 100644
--- a/drivers/target/tcm_loop/tcm_loop_core.h
+++ b/drivers/target/tcm_loop/tcm_loop_core.h
@@ -29,9 +29,11 @@ struct tcm_loop_cmd {
u32 sc_cmd_state;
/* Pointer to the CDB+Data descriptor from Linux/SCSI subsystem */
struct scsi_cmnd *sc;
- /* Pointer to the TCM allocated struct se_cmd */
- struct se_cmd *tl_se_cmd;
struct list_head *tl_cmd_list;
+ /* The TCM I/O descriptor that is accessed via container_of() */
+ struct se_cmd tl_se_cmd;
+ /* Sense buffer that will be mapped into outgoing status */
+ unsigned char tl_sense_buf[TRANSPORT_SENSE_BUFFER];
};
struct tcm_loop_tmr {
diff --git a/drivers/target/tcm_loop/tcm_loop_fabric.c b/drivers/target/tcm_loop/tcm_loop_fabric.c
index abd643d..b12a760 100644
--- a/drivers/target/tcm_loop/tcm_loop_fabric.c
+++ b/drivers/target/tcm_loop/tcm_loop_fabric.c
@@ -305,8 +305,8 @@ u32 tcm_loop_get_task_tag(struct se_cmd *se_cmd)
int tcm_loop_get_cmd_state(struct se_cmd *se_cmd)
{
- struct tcm_loop_cmd *tl_cmd =
- (struct tcm_loop_cmd *)se_cmd->se_fabric_cmd_ptr;
+ struct tcm_loop_cmd *tl_cmd = container_of(se_cmd,
+ struct tcm_loop_cmd, tl_se_cmd);
return tl_cmd->sc_cmd_state;
}
@@ -376,8 +376,8 @@ int tcm_loop_write_pending_status(struct se_cmd *se_cmd)
int tcm_loop_queue_data_in(struct se_cmd *se_cmd)
{
- struct tcm_loop_cmd *tl_cmd =
- (struct tcm_loop_cmd *)se_cmd->se_fabric_cmd_ptr;
+ struct tcm_loop_cmd *tl_cmd = container_of(se_cmd,
+ struct tcm_loop_cmd, tl_se_cmd);
struct scsi_cmnd *sc = tl_cmd->sc;
TL_CDB_DEBUG( "tcm_loop_queue_data_in() called for scsi_cmnd: %p"
@@ -398,8 +398,8 @@ int tcm_loop_queue_data_in(struct se_cmd *se_cmd)
int tcm_loop_queue_status(struct se_cmd *se_cmd)
{
- struct tcm_loop_cmd *tl_cmd =
- (struct tcm_loop_cmd *)se_cmd->se_fabric_cmd_ptr;
+ struct tcm_loop_cmd *tl_cmd = container_of(se_cmd,
+ struct tcm_loop_cmd, tl_se_cmd);
struct scsi_cmnd *sc = tl_cmd->sc;
TL_CDB_DEBUG("tcm_loop_queue_status() called for scsi_cmnd: %p"
diff --git a/drivers/target/tcm_loop/tcm_loop_fabric_scsi.c b/drivers/target/tcm_loop/tcm_loop_fabric_scsi.c
index 46d24b4..fee70fe 100644
--- a/drivers/target/tcm_loop/tcm_loop_fabric_scsi.c
+++ b/drivers/target/tcm_loop/tcm_loop_fabric_scsi.c
@@ -100,17 +100,14 @@ static struct se_cmd *tcm_loop_allocate_core_cmd(
}
} else
sam_task_attr = TASK_ATTR_SIMPLE;
+
+ se_cmd = &tl_cmd->tl_se_cmd;
/*
- * Allocate the struct se_cmd descriptor from target_core_mod infrastructure
+ * Initialize struct se_cmd descriptor from target_core_mod infrastructure
*/
- tl_cmd->tl_se_cmd = transport_alloc_se_cmd(se_tpg->se_tpg_tfo,
- se_sess, (void *)tl_cmd, scsi_bufflen(sc),
- data_direction, sam_task_attr);
- if (!(tl_cmd->tl_se_cmd)) {
- kmem_cache_free(tcm_loop_cmd_cache, tl_cmd);
- return NULL;
- }
- se_cmd = tl_cmd->tl_se_cmd;
+ transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
+ scsi_bufflen(sc), data_direction, sam_task_attr,
+ &tl_cmd->tl_sense_buf[0]);
/*
* Locate the struct se_lun pointer and attach it to struct se_cmd
*/
@@ -136,7 +133,8 @@ static struct se_cmd *tcm_loop_allocate_core_cmd(
*/
int tcm_loop_new_cmd_map(struct se_cmd *se_cmd)
{
- struct tcm_loop_cmd *tl_cmd = se_cmd->se_fabric_cmd_ptr;
+ struct tcm_loop_cmd *tl_cmd = container_of(se_cmd,
+ struct tcm_loop_cmd, tl_se_cmd);
struct scsi_cmnd *sc = tl_cmd->sc;
void *mem_ptr;
int ret;
@@ -206,12 +204,12 @@ void tcm_loop_check_stop_free(struct se_cmd *se_cmd)
}
/*
- * Called from struct target_core_fabric_ops->releastruct se_cmdo_pool()
+ * Called from struct target_core_fabric_ops->release_cmd_to_pool()
*/
void tcm_loop_deallocate_core_cmd(struct se_cmd *se_cmd)
{
- struct tcm_loop_cmd *tl_cmd =
- (struct tcm_loop_cmd *)se_cmd->se_fabric_cmd_ptr;
+ struct tcm_loop_cmd *tl_cmd = container_of(se_cmd,
+ struct tcm_loop_cmd, tl_se_cmd);
kmem_cache_free(tcm_loop_cmd_cache, tl_cmd);
}
@@ -417,15 +415,14 @@ static int tcm_loop_device_reset(struct scsi_cmnd *sc)
goto release;
}
init_waitqueue_head(&tl_tmr->tl_tmr_wait);
+
+ se_cmd = &tl_cmd->tl_se_cmd;
/*
- * Allocate the struct se_cmd for a LUN_RESET TMR
+ * Initialize struct se_cmd descriptor from target_core_mod infrastructure
*/
- tl_cmd->tl_se_cmd = transport_alloc_se_cmd(se_tpg->se_tpg_tfo,
- se_sess, (void *)tl_cmd, 0, SE_DIRECTION_NONE,
- TASK_ATTR_SIMPLE);
- if (!(tl_cmd->tl_se_cmd))
- goto release;
- se_cmd = tl_cmd->tl_se_cmd;
+ transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess, 0,
+ SE_DIRECTION_NONE, TASK_ATTR_SIMPLE,
+ &tl_cmd->tl_sense_buf[0]);
/*
* Allocate the LUN_RESET TMR
*/
--
1.5.6.5
--
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