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target: make the ->get_cdb method optional

Browse source 
The most commonly used file, iblock and rd backends have no use for
a per-task CDB and thus don't need a method to copy it into their
otherwise unused CDB fields.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
This commit is contained in:
Christoph Hellwig 2011-10-12 11:09:11 -04:00 committed by Nicholas Bellinger
parent 3189b067ee
commit 6193f06e6f
7 changed files with 15 additions and 48 deletions
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12
drivers/target/target_core_file.c
View file

@ -609,17 +609,6 @@ static ssize_t fd_show_configfs_dev_params(
return bl;
}
/* fd_get_cdb(): (Part of se_subsystem_api_t template)
*
*
*/
static unsigned char *fd_get_cdb(struct se_task *task)
{
struct fd_request *req = FILE_REQ(task);
return req->fd_scsi_cdb;
}
/* fd_get_device_rev(): (Part of se_subsystem_api_t template)
*
*
@ -667,7 +656,6 @@ static struct se_subsystem_api fileio_template = {
.check_configfs_dev_params = fd_check_configfs_dev_params,
.set_configfs_dev_params = fd_set_configfs_dev_params,
.show_configfs_dev_params = fd_show_configfs_dev_params,
.get_cdb = fd_get_cdb,
.get_device_rev = fd_get_device_rev,
.get_device_type = fd_get_device_type,
.get_blocks = fd_get_blocks,

4
drivers/target/target_core_file.h
View file

@ -14,9 +14,7 @@
struct fd_request {
struct se_task fd_task;
/* SCSI CDB from iSCSI Command PDU */
unsigned char fd_scsi_cdb[TCM_MAX_COMMAND_SIZE];
} ____cacheline_aligned;
};
#define FBDF_HAS_PATH 0x01
#define FBDF_HAS_SIZE 0x02

6
drivers/target/target_core_iblock.c
View file

@ -618,11 +618,6 @@ static int iblock_do_task(struct se_task *task)
return PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES;
}
static unsigned char *iblock_get_cdb(struct se_task *task)
{
return IBLOCK_REQ(task)->ib_scsi_cdb;
}
static u32 iblock_get_device_rev(struct se_device *dev)
{
return SCSI_SPC_2; /* Returns SPC-3 in Initiator Data */
@ -696,7 +691,6 @@ static struct se_subsystem_api iblock_template = {
.check_configfs_dev_params = iblock_check_configfs_dev_params,
.set_configfs_dev_params = iblock_set_configfs_dev_params,
.show_configfs_dev_params = iblock_show_configfs_dev_params,
.get_cdb = iblock_get_cdb,
.get_device_rev = iblock_get_device_rev,
.get_device_type = iblock_get_device_type,
.get_blocks = iblock_get_blocks,

1
drivers/target/target_core_iblock.h
View file

@ -8,7 +8,6 @@
struct iblock_req {
struct se_task ib_task;
unsigned char ib_scsi_cdb[TCM_MAX_COMMAND_SIZE];
atomic_t ib_bio_cnt;
atomic_t ib_bio_err_cnt;
} ____cacheline_aligned;

12
drivers/target/target_core_rd.c
View file

@ -691,17 +691,6 @@ static ssize_t rd_show_configfs_dev_params(
return bl;
}
/* rd_get_cdb(): (Part of se_subsystem_api_t template)
*
*
*/
static unsigned char *rd_get_cdb(struct se_task *task)
{
struct rd_request *req = RD_REQ(task);
return req->rd_scsi_cdb;
}
static u32 rd_get_device_rev(struct se_device *dev)
{
return SCSI_SPC_2; /* Returns SPC-3 in Initiator Data */
@ -735,7 +724,6 @@ static struct se_subsystem_api rd_mcp_template = {
.check_configfs_dev_params = rd_check_configfs_dev_params,
.set_configfs_dev_params = rd_set_configfs_dev_params,
.show_configfs_dev_params = rd_show_configfs_dev_params,
.get_cdb = rd_get_cdb,
.get_device_rev = rd_get_device_rev,
.get_device_type = rd_get_device_type,
.get_blocks = rd_get_blocks,

2
drivers/target/target_core_rd.h
View file

@ -22,8 +22,6 @@ void rd_module_exit(void);
struct rd_request {
struct se_task rd_task;
/* SCSI CDB from iSCSI Command PDU */
unsigned char rd_scsi_cdb[TCM_MAX_COMMAND_SIZE];
/* Offset from start of page */
u32 rd_offset;
/* Starting page in Ramdisk for request */

26
drivers/target/target_core_transport.c
View file

@ -3932,7 +3932,6 @@ static int transport_allocate_data_tasks(
struct scatterlist *sgl,
unsigned int sgl_nents)
{
unsigned char *cdb = NULL;
struct se_task *task;
struct se_device *dev = cmd->se_dev;
unsigned long flags;
@ -3959,14 +3958,17 @@ static int transport_allocate_data_tasks(
task->task_sectors = min(sectors, dev_max_sectors);
task->task_size = task->task_sectors * sector_size;
cdb = dev->transport->get_cdb(task);
BUG_ON(!cdb);
if (dev->transport->get_cdb) {
unsigned char *cdb = dev->transport->get_cdb(task);
memcpy(cdb, cmd->t_task_cdb,
scsi_command_size(cmd->t_task_cdb));
memcpy(cdb, cmd->t_task_cdb,
scsi_command_size(cmd->t_task_cdb));
/* Update new cdb with updated lba/sectors */
cmd->transport_split_cdb(task->task_lba,
task->task_sectors, cdb);
}
/* Update new cdb with updated lba/sectors */
cmd->transport_split_cdb(task->task_lba, task->task_sectors, cdb);
/*
* This now assumes that passed sg_ents are in PAGE_SIZE chunks
* in order to calculate the number per task SGL entries
@ -4021,7 +4023,6 @@ static int
transport_allocate_control_task(struct se_cmd *cmd)
{
struct se_device *dev = cmd->se_dev;
unsigned char *cdb;
struct se_task *task;
unsigned long flags;
@ -4029,10 +4030,11 @@ transport_allocate_control_task(struct se_cmd *cmd)
if (!task)
return -ENOMEM;
cdb = dev->transport->get_cdb(task);
BUG_ON(!cdb);
memcpy(cdb, cmd->t_task_cdb,
scsi_command_size(cmd->t_task_cdb));
if (dev->transport->get_cdb) {
unsigned char *cdb = dev->transport->get_cdb(task);
memcpy(cdb, cmd->t_task_cdb, scsi_command_size(cmd->t_task_cdb));
}
task->task_sg = kmalloc(sizeof(struct scatterlist) * cmd->t_data_nents,
GFP_KERNEL);