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Date: Wed, 15 Sep 2010 05:06:42 -0700
From: "Nicholas A. Bellinger" <nab@...ux-iscsi.org>
To: linux-scsi <linux-scsi@...r.kernel.org>,
linux-kernel <linux-kernel@...r.kernel.org>,
Boaz Harrosh <bharrosh@...asas.com>,
FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
Cc: Mike Christie <michaelc@...wisc.edu>,
Hannes Reinecke <hare@...e.de>,
James Bottomley <James.Bottomley@...e.de>,
Konrad Rzeszutek Wilk <konrad@...nok.org>,
Douglas Gilbert <dgilbert@...erlog.com>,
Joe Eykholt <jeykholt@...co.com>,
Nicholas Bellinger <nab@...ux-iscsi.org>
Subject: [PATCH 1/2] tcm: Add support for BIDI operation and XDWRITE_READ_10 emulation
From: Nicholas Bellinger <nab@...ux-iscsi.org>
This patch series adds DMA_BIDIRECTIONAL support to TCM Core. This
includes the following for struct se_cmd to handle BIDI READ payloads using a new
struct se_transport_task->t_mem_bidi_list and struct se_transport_task->t_tasks_se_bidi_num.
The model used to keep the WRITE payload at struct se_transport_task->t_mem_list,
and add a new READ payload memory list at struct se_transport_task->t_mem_bidi_list.
*) desciptor setup:
This patch adds support for XDWRITEREAD_10 within transport_generic_cmd_sequencer(),
and sets up the new struct se_cmd->transport_xor_callback() completion function
at transport_xor_callback(). It then updates transport_new_cmd_obj() to handle the
BIDI READ case.
It also adds support for DMA_BIDIRECTIONAL to transport_generic_map_mem_to_cmd()
to setup struct se_transport_task->t_mem_bidi_list for BIDI READ payloads
*) memory mapping:
This patch updates transport_generic_get_cdb_count() to accept a enum dma_data_direction
parameter to handle the BIDI and the existing WRITE/READ cases for SCF_SCSI_DATA_SG_IO_CDB.
This patch also updates transport_generic_map_mem_to_cmd() to accept a 'void *mem_bidi_in'
and 'u32 se_mem_bidi_num' from BIDI capable TCM fabric modules.
It then updates transport_generic_get_task() and struct se_cmd->transport_get_task()
to accept a enum dma_data_direction function parameter.
*) descriptor callback:
For the struct se_cmd callback, it updates transport_generic_complete_ok() to support
DMA_BIDIRECTIONAL and looks for the new struct se_cmd->transport_xor_callback() in
transport_generic_cmd_sequencer() to perform the post READ/WRITE XOR emulation.
This also includes the additon of transport_memcpy_se_mem_read_contig() used to copy the
WRITE scatterlists into a local contigious buffer for the XOR instructions within
transport_xor_callback();
*) descriptor release:
Update transport_free_pages() to walk the new T_TASK(cmd)->t_mem_bidi_list (when available)
and release struct se_mem and pages.
So far this has been tested with TCM_Loop using BSG w/ userspace code generating
BIDI XDWRITE_READ_10 CDBs.
Signed-off-by: Nicholas A. Bellinger <nab@...ux-iscsi.org>
---
drivers/target/target_core_transport.c | 282 ++++++++++++++++++++++++++++----
include/target/target_core_base.h | 9 +-
include/target/target_core_transport.h | 10 +-
3 files changed, 261 insertions(+), 40 deletions(-)
diff --git a/drivers/target/target_core_transport.c b/drivers/target/target_core_transport.c
index 517a59c..37afc39 100644
--- a/drivers/target/target_core_transport.c
+++ b/drivers/target/target_core_transport.c
@@ -2529,7 +2529,8 @@ static inline int transport_check_device_cdb_sector_count(
static struct se_task *transport_generic_get_task(
struct se_transform_info *ti,
struct se_cmd *cmd,
- void *se_obj_ptr)
+ void *se_obj_ptr,
+ enum dma_data_direction data_direction)
{
struct se_task *task;
struct se_device *dev = SE_DEV(cmd);
@@ -2625,7 +2626,8 @@ static int transport_process_control_sg_transform(
return -1;
}
- task = cmd->transport_get_task(ti, cmd, ti->se_obj_ptr);
+ task = cmd->transport_get_task(ti, cmd, ti->se_obj_ptr,
+ cmd->data_direction);
if (!(task))
return -1;
@@ -2665,7 +2667,8 @@ static int transport_process_control_nonsg_transform(
unsigned char *cdb;
struct se_task *task;
- task = cmd->transport_get_task(ti, cmd, ti->se_obj_ptr);
+ task = cmd->transport_get_task(ti, cmd, ti->se_obj_ptr,
+ cmd->data_direction);
if (!(task))
return -1;
@@ -2699,7 +2702,8 @@ static int transport_process_non_data_transform(
unsigned char *cdb;
struct se_task *task;
- task = cmd->transport_get_task(ti, cmd, ti->se_obj_ptr);
+ task = cmd->transport_get_task(ti, cmd, ti->se_obj_ptr,
+ cmd->data_direction);
if (!(task))
return -1;
@@ -5183,6 +5187,54 @@ int transport_generic_emulate_request_sense(
}
EXPORT_SYMBOL(transport_generic_emulate_request_sense);
+static void transport_xor_callback(struct se_cmd *cmd)
+{
+ unsigned char *buf, *addr;
+ struct se_mem *se_mem;
+ unsigned int offset;
+ int i;
+ /*
+ * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command
+ *
+ * 1) read the specified logical block(s);
+ * 2) transfer logical blocks from the data-out buffer;
+ * 3) XOR the logical blocks transferred from the data-out buffer with
+ * the logical blocks read, storing the resulting XOR data in a buffer;
+ * 4) if the DISABLE WRITE bit is set to zero, then write the logical
+ * blocks transferred from the data-out buffer; and
+ * 5) transfer the resulting XOR data to the data-in buffer.
+ */
+ buf = kmalloc(cmd->data_length, GFP_KERNEL);
+ if (!(buf)) {
+ printk(KERN_ERR "Unable to allocate xor_callback buf\n");
+ return;
+ }
+ /*
+ * Copy the scatterlist WRITE buffer located at T_TASK(cmd)->t_mem_list
+ * into the locally allocated *buf
+ */
+ transport_memcpy_se_mem_read_contig(cmd, buf, T_TASK(cmd)->t_mem_list);
+ /*
+ * Now perform the XOR against the BIDI read memory located at
+ * T_TASK(cmd)->t_mem_bidi_list
+ */
+
+ offset = 0;
+ list_for_each_entry(se_mem, T_TASK(cmd)->t_mem_bidi_list, se_list) {
+ addr = (unsigned char *)kmap_atomic(se_mem->se_page, KM_USER0);
+ if (!(addr))
+ goto out;
+
+ for (i = 0; i < se_mem->se_len; i++)
+ *(addr + se_mem->se_off + i) ^= *(buf + offset + i);
+
+ offset += se_mem->se_len;
+ kunmap_atomic(addr, KM_USER0);
+ }
+out:
+ kfree(buf);
+}
+
/*
* Used to obtain Sense Data from underlying Linux/SCSI struct scsi_cmnd
*/
@@ -5472,6 +5524,25 @@ static int transport_generic_cmd_sequencer(
T_TASK(cmd)->t_tasks_fua = (cdb[1] & 0x8);
ret = TGCS_DATA_SG_IO_CDB;
break;
+ case XDWRITEREAD_10:
+ SET_GENERIC_TRANSPORT_FUNCTIONS(cmd);
+ if (cmd->data_direction != DMA_BIDIRECTIONAL)
+ return TGCS_INVALID_CDB_FIELD;
+ sectors = transport_get_sectors_10(cdb, cmd, §or_ret);
+ if (sector_ret)
+ return TGCS_UNSUPPORTED_CDB;
+ size = transport_get_size(sectors, cdb, cmd);
+ transport_dev_get_mem_SG(cmd->se_orig_obj_ptr, cmd);
+ transport_get_maps(cmd);
+ cmd->transport_split_cdb = &split_cdb_XX_10;
+ cmd->transport_get_lba = &transport_lba_32;
+ /*
+ * Setup BIDI XOR callback to be run during transport_generic_complete_ok()
+ */
+ cmd->transport_xor_callback = &transport_xor_callback;
+ T_TASK(cmd)->t_tasks_fua = (cdb[1] & 0x8);
+ ret = TGCS_DATA_SG_IO_CDB;
+ break;
case 0xa3:
SET_GENERIC_TRANSPORT_FUNCTIONS(cmd);
if (TRANSPORT(dev)->get_device_type(dev) != TYPE_ROM) {
@@ -5842,9 +5913,10 @@ static int transport_generic_cmd_sequencer(
cmd->cmd_spdtl = size;
- if (cmd->data_direction == DMA_TO_DEVICE) {
+ if ((cmd->data_direction == DMA_TO_DEVICE) ||
+ (cmd->data_direction == DMA_BIDIRECTIONAL)) {
printk(KERN_ERR "Rejecting underflow/overflow"
- " WRITE data\n");
+ " WRITE or BIDI data\n");
return TGCS_INVALID_CDB_FIELD;
}
/*
@@ -6096,6 +6168,33 @@ void transport_memcpy_read_contig(
}
EXPORT_SYMBOL(transport_memcpy_read_contig);
+void transport_memcpy_se_mem_read_contig(
+ struct se_cmd *cmd,
+ unsigned char *dst,
+ struct list_head *se_mem_list)
+{
+ struct se_mem *se_mem;
+ void *src;
+ u32 length = 0, total_length = cmd->data_length;
+
+ list_for_each_entry(se_mem, se_mem_list, se_list) {
+ length = se_mem->se_len;
+
+ if (length > total_length)
+ length = total_length;
+
+ src = page_address(se_mem->se_page) + se_mem->se_off;
+
+ memcpy(dst, src, length);
+
+ if (!(total_length -= length))
+ return;
+
+ dst += length;
+ }
+}
+
+
/* transport_generic_passthrough():
*
*
@@ -6252,6 +6351,18 @@ void transport_generic_complete_ok(struct se_cmd *cmd)
switch (cmd->data_direction) {
case DMA_FROM_DEVICE:
+ case DMA_BIDIRECTIONAL:
+ /*
+ * Check for the XOR BIDI callback emulation for XD_WRITEREAD_*
+ */
+ if (cmd->transport_xor_callback) {
+ /*
+ * For fully emulated HBAs, this will translate to
+ * transport_xor_callback()
+ */
+ cmd->transport_xor_callback(cmd);
+ }
+
spin_lock(&cmd->se_lun->lun_sep_lock);
if (SE_LUN(cmd)->lun_sep) {
SE_LUN(cmd)->lun_sep->sep_stats.tx_data_octets +=
@@ -6347,6 +6458,23 @@ static inline void transport_free_pages(struct se_cmd *cmd)
kmem_cache_free(se_mem_cache, se_mem);
}
+ if (T_TASK(cmd)->t_mem_bidi_list && T_TASK(cmd)->t_tasks_se_bidi_num) {
+ list_for_each_entry_safe(se_mem, se_mem_tmp,
+ T_TASK(cmd)->t_mem_bidi_list, se_list) {
+ /*
+ * We only release call __free_page(struct se_mem->se_page) when
+ * SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC is NOT in use,
+ */
+ if (free_page)
+ __free_page(se_mem->se_page);
+
+ list_del(&se_mem->se_list);
+ kmem_cache_free(se_mem_cache, se_mem);
+ }
+ }
+
+ kfree(T_TASK(cmd)->t_mem_bidi_list);
+ T_TASK(cmd)->t_mem_bidi_list = NULL;
kfree(T_TASK(cmd)->t_mem_list);
T_TASK(cmd)->t_mem_list = NULL;
T_TASK(cmd)->t_tasks_se_num = 0;
@@ -6477,18 +6605,34 @@ release_cmd:
int transport_generic_map_mem_to_cmd(
struct se_cmd *cmd,
void *mem,
- u32 se_mem_num)
+ u32 se_mem_num,
+ void *mem_bidi_in,
+ u32 se_mem_bidi_num)
{
u32 se_mem_cnt_out = 0;
int ret;
if (!(mem) || !(se_mem_num))
return 0;
+
+ if ((cmd->data_direction == DMA_BIDIRECTIONAL) &&
+ (!(mem_bidi_in) || !(se_mem_bidi_num))) {
+ printk(KERN_ERR "Unable to process DMA_BIDIRECTIONAL with mem_bidi_in:"
+ " %p and se_mem_bidi_num: %u\n", mem_bidi_in, se_mem_bidi_num);
+ return -EINVAL;
+ }
+
/*
* Passed *mem will contain a list_head containing preformatted
* struct se_mem elements...
*/
if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM)) {
+ if (cmd->data_direction == DMA_BIDIRECTIONAL) {
+ printk(KERN_ERR "SCF_CMD_PASSTHROUGH_NOALLOC not supported"
+ " with DMA_BIDIRECTIONAL\n");
+ return -ENOSYS;
+ }
+
T_TASK(cmd)->t_mem_list = (struct list_head *)mem;
T_TASK(cmd)->t_tasks_se_num = se_mem_num;
cmd->se_cmd_flags |= SCF_CMD_PASSTHROUGH_NOALLOC;
@@ -6507,14 +6651,35 @@ int transport_generic_map_mem_to_cmd(
*/
T_TASK(cmd)->t_mem_list = transport_init_se_mem_list();
if (!(T_TASK(cmd)->t_mem_list))
- return -1;
+ return -ENOMEM;
ret = transport_map_sg_to_mem(cmd,
T_TASK(cmd)->t_mem_list, mem, &se_mem_cnt_out);
if (ret < 0)
- return -1;
+ return -ENOMEM;
T_TASK(cmd)->t_tasks_se_num = se_mem_cnt_out;
+ /*
+ * Setup BIDI READ list of struct se_mem elements
+ */
+ if (cmd->data_direction == DMA_BIDIRECTIONAL) {
+ T_TASK(cmd)->t_mem_bidi_list = transport_init_se_mem_list();
+ if (!(T_TASK(cmd)->t_mem_bidi_list)) {
+ kfree(T_TASK(cmd)->t_mem_list);
+ return -ENOMEM;
+ }
+ se_mem_cnt_out = 0;
+
+ ret = transport_map_sg_to_mem(cmd,
+ T_TASK(cmd)->t_mem_bidi_list, mem_bidi_in,
+ &se_mem_cnt_out);
+ if (ret < 0) {
+ kfree(T_TASK(cmd)->t_mem_list);
+ return -ENOMEM;
+ }
+
+ T_TASK(cmd)->t_tasks_se_bidi_num = se_mem_cnt_out;
+ }
cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
} else if (cmd->se_cmd_flags & SCF_SCSI_CONTROL_NONSG_IO_CDB) {
@@ -6610,6 +6775,11 @@ non_scsi_data:
*/
int transport_generic_do_transform(struct se_cmd *cmd, struct se_transform_info *ti)
{
+ if (!(cmd->transport_cdb_transform)) {
+ dump_stack();
+ return -1;
+ }
+
if (cmd->transport_cdb_transform(cmd, ti) < 0)
return -1;
@@ -6656,9 +6826,9 @@ int transport_new_cmd_obj(
struct se_transform_info *ti,
int post_execute)
{
- u32 task_cdbs = 0;
- struct se_mem *se_mem_out = NULL;
struct se_device *dev = SE_DEV(cmd);
+ enum dma_data_direction data_direction;
+ u32 task_cdbs = 0, rc;
if (!(cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB)) {
task_cdbs++;
@@ -6666,11 +6836,38 @@ int transport_new_cmd_obj(
} else {
ti->ti_set_counts = 1;
ti->ti_dev = dev;
-
+ /*
+ * Setup any BIDI READ tasks and memory from
+ * T_TASK(cmd)->t_mem_bidi_list so the READ struct se_tasks
+ * are queued first..
+ */
+ if (cmd->data_direction == DMA_BIDIRECTIONAL) {
+ rc = transport_generic_get_cdb_count(cmd, ti,
+ T_TASK(cmd)->t_task_lba,
+ T_TASK(cmd)->t_tasks_sectors,
+ DMA_FROM_DEVICE, T_TASK(cmd)->t_mem_bidi_list);
+ if (!(rc)) {
+ cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
+ cmd->scsi_sense_reason =
+ TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
+ return PYX_TRANSPORT_LU_COMM_FAILURE;
+ }
+ ti->ti_set_counts = 0;
+ /*
+ * Setup the DMA_TO_DEVICE direction for the next
+ * call to transport_generic_get_cdb_count()
+ */
+ data_direction = DMA_TO_DEVICE;
+ } else
+ data_direction = cmd->data_direction;
+ /*
+ * Setup the tasks and memory from T_TASK(cmd)->t_mem_list
+ * Note for BIDI transfers this will contain the WRITE payload
+ */
task_cdbs = transport_generic_get_cdb_count(cmd, ti,
T_TASK(cmd)->t_task_lba,
T_TASK(cmd)->t_tasks_sectors,
- NULL, &se_mem_out);
+ data_direction, T_TASK(cmd)->t_mem_list);
if (!(task_cdbs)) {
cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
cmd->scsi_sense_reason =
@@ -6743,7 +6940,17 @@ int transport_generic_get_mem(struct se_cmd *cmd, u32 length, u32 dma_size)
T_TASK(cmd)->t_mem_list = transport_init_se_mem_list();
if (!(T_TASK(cmd)->t_mem_list))
- return -1;
+ return -ENOMEM;
+ /*
+ * Setup BIDI READ list of struct se_mem elements
+ */
+ if (cmd->data_direction == DMA_BIDIRECTIONAL) {
+ T_TASK(cmd)->t_mem_bidi_list = transport_init_se_mem_list();
+ if (!(T_TASK(cmd)->t_mem_bidi_list)) {
+ kfree(T_TASK(cmd)->t_mem_list);
+ return -ENOMEM;
+ }
+ }
while (length) {
se_mem = kmem_cache_zalloc(se_mem_cache, GFP_KERNEL);
@@ -7240,28 +7447,28 @@ u32 transport_generic_get_cdb_count(
struct se_transform_info *ti,
unsigned long long starting_lba,
u32 sectors,
- struct se_mem *se_mem_in,
- struct se_mem **se_mem_out)
+ enum dma_data_direction data_direction,
+ struct list_head *mem_list)
{
unsigned char *cdb = NULL;
struct se_task *task;
- struct se_mem *se_mem, *se_mem_lout = NULL;
+ struct se_mem *se_mem = NULL, *se_mem_lout = NULL;
struct se_device *dev = SE_DEV(cmd);
int max_sectors_set = 0, ret;
u32 task_offset_in = 0, se_mem_cnt = 0, task_cdbs = 0;
unsigned long long lba;
- if (!se_mem_in) {
- list_for_each_entry(se_mem_in, T_TASK(cmd)->t_mem_list, se_list)
- break;
-
- if (!se_mem_in) {
- printk(KERN_ERR "se_mem_in is NULL\n");
- return 0;
- }
+ if (!mem_list) {
+ printk(KERN_ERR "mem_list is NULL in transport_generic_get"
+ "_cdb_count()\n");
+ return 0;
}
- se_mem = se_mem_in;
-
+ /*
+ * While using RAMDISK_DR backstores is the only case where
+ * mem_list will ever be empty at this point.
+ */
+ if (!(list_empty(mem_list)))
+ se_mem = list_entry(mem_list->next, struct se_mem, se_list);
/*
* Locate the start volume segment in which the received LBA will be
* executed upon.
@@ -7280,7 +7487,12 @@ u32 transport_generic_get_cdb_count(
CMD_TFO(cmd)->get_task_tag(cmd), lba, sectors,
transport_dev_end_lba(dev));
- task = cmd->transport_get_task(ti, cmd, dev);
+ if (!(cmd->transport_get_task)) {
+ dump_stack();
+ goto out;
+ }
+
+ task = cmd->transport_get_task(ti, cmd, dev, data_direction);
if (!(task))
goto out;
@@ -7293,7 +7505,7 @@ u32 transport_generic_get_cdb_count(
task->task_size = (task->task_sectors *
DEV_ATTRIB(dev)->block_size);
task->transport_map_task = transport_dev_get_map_SG(dev,
- cmd->data_direction);
+ data_direction);
cdb = TRANSPORT(dev)->get_cdb(task);
if ((cdb)) {
@@ -7306,14 +7518,13 @@ u32 transport_generic_get_cdb_count(
* Perform the SE OBJ plugin and/or Transport plugin specific
* mapping for T_TASK(cmd)->t_mem_list.
*/
- ret = transport_do_se_mem_map(dev, task,
- T_TASK(cmd)->t_mem_list, NULL, se_mem,
- &se_mem_lout, &se_mem_cnt, &task_offset_in);
+ ret = transport_do_se_mem_map(dev, task, mem_list,
+ NULL, se_mem, &se_mem_lout, &se_mem_cnt,
+ &task_offset_in);
if (ret < 0)
goto out;
se_mem = se_mem_lout;
- *se_mem_out = se_mem_lout;
task_cdbs++;
DEBUG_VOL("Incremented task_cdbs(%u) task->task_sg_num(%u)\n",
@@ -7333,8 +7544,9 @@ u32 transport_generic_get_cdb_count(
atomic_inc(&T_TASK(cmd)->t_se_count);
}
- DEBUG_VOL("ITT[0x%08x] total cdbs(%u)\n",
- CMD_TFO(cmd)->get_task_tag(cmd), task_cdbs);
+ DEBUG_VOL("ITT[0x%08x] total %s cdbs(%u)\n",
+ CMD_TFO(cmd)->get_task_tag(cmd), (data_direction == DMA_TO_DEVICE)
+ ? "DMA_TO_DEVICE" : "DMA_FROM_DEVICE", task_cdbs);
return task_cdbs;
out:
diff --git a/include/target/target_core_base.h b/include/target/target_core_base.h
index e9b98e9..f1b9364 100644
--- a/include/target/target_core_base.h
+++ b/include/target/target_core_base.h
@@ -419,6 +419,7 @@ struct se_transport_task {
u32 t_tasks_no;
u32 t_tasks_sectors;
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;
@@ -447,8 +448,10 @@ struct se_transport_task {
struct scatterlist t_tasks_sg_bounce;
void *t_task_buf;
void *t_task_pt_buf;
- struct list_head t_task_list;
struct list_head *t_mem_list;
+ /* Used for BIDI READ */
+ struct list_head *t_mem_bidi_list;
+ struct list_head t_task_list;
} ____cacheline_aligned;
struct se_task {
@@ -598,7 +601,8 @@ struct se_cmd {
u32 (*transport_get_lba)(unsigned char *);
unsigned long long (*transport_get_long_lba)(unsigned char *);
struct se_task *(*transport_get_task)(struct se_transform_info *,
- struct se_cmd *, void *);
+ struct se_cmd *, void *,
+ enum dma_data_direction);
int (*transport_map_buffers_to_tasks)(struct se_cmd *);
void (*transport_map_SG_segments)(struct se_unmap_sg *);
void (*transport_passthrough_done)(struct se_cmd *);
@@ -607,6 +611,7 @@ struct se_cmd {
struct se_unmap_sg *);
void (*transport_split_cdb)(unsigned long long, u32 *, unsigned char *);
void (*transport_wait_for_tasks)(struct se_cmd *, int, int);
+ void (*transport_xor_callback)(struct se_cmd *);
void (*callback)(struct se_cmd *cmd, void *callback_arg,
int complete_status);
void *callback_arg;
diff --git a/include/target/target_core_transport.h b/include/target/target_core_transport.h
index ef4c084..20702d7 100644
--- a/include/target/target_core_transport.h
+++ b/include/target/target_core_transport.h
@@ -232,6 +232,8 @@ extern void transport_memcpy_write_contig(struct se_cmd *, struct scatterlist *,
unsigned char *);
extern void transport_memcpy_read_contig(struct se_cmd *, unsigned char *,
struct scatterlist *);
+extern void transport_memcpy_se_mem_read_contig(struct se_cmd *,
+ unsigned char *, struct list_head *);
extern int transport_generic_passthrough_async(struct se_cmd *cmd,
void(*callback)(struct se_cmd *cmd,
void *callback_arg, int complete_status),
@@ -242,7 +244,8 @@ extern void transport_generic_complete_ok(struct se_cmd *);
extern void transport_free_dev_tasks(struct se_cmd *);
extern void transport_release_fe_cmd(struct se_cmd *);
extern int transport_generic_remove(struct se_cmd *, int, int);
-extern int transport_generic_map_mem_to_cmd(struct se_cmd *cmd, void *, u32);
+extern int transport_generic_map_mem_to_cmd(struct se_cmd *cmd, void *, u32,
+ void *, u32);
extern int transport_lun_wait_for_tasks(struct se_cmd *, struct se_lun *);
extern int transport_clear_lun_from_sessions(struct se_lun *);
extern int transport_check_aborted_status(struct se_cmd *, int);
@@ -271,8 +274,9 @@ extern int transport_map_mem_to_sg(struct se_task *, struct list_head *,
extern void transport_do_task_sg_chain(struct se_cmd *);
extern u32 transport_generic_get_cdb_count(struct se_cmd *,
struct se_transform_info *,
- unsigned long long, u32, struct se_mem *,
- struct se_mem **);
+ unsigned long long, u32,
+ enum dma_data_direction,
+ struct list_head *);
extern int transport_generic_new_cmd(struct se_cmd *);
extern void transport_generic_process_write(struct se_cmd *);
extern int transport_generic_do_tmr(struct se_cmd *);
--
1.5.6.5
--
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