target: Updates from AGrover and HCH (round 3)

This patch contains a squashed version of third round series cleanups,
improvements ,and simplfications from Andy and Christoph ahead of the
heavy lifting between round 3 -> 4 for the target core SGL conversion.

This include cleanups to the main target I/O path and other miscellaneous
updates.

target: Replace custom sg<->buf functions with lib funcs
target: Simplify sector limiting code
target: get_cdb should never return NULL
target: Simplify transport_memcpy_se_mem_read_contig
target: Use assignment rather than increment for t_task_cdbs
target: Don't pass dma_size to generic_get_mem
target: Pass sg with type scatterlist in transport_map_sg_to_mem
target: Move task_sg_num next to task_sg in struct se_task
target: inline struct se_transport_task into struct se_cmd
target: Change name & semantics of transport_get_sectors()
target: Remove unused members of se_cmd
target: Rename se_cmd.t_task_cdbs to t_task_list_num
target: Fix some spelling
target: Remove unused var from transport_generic_do_tmr
target: map_sg_to_mem: return sg_count in return value
target/pscsi: Use min_t for sector limits
target/pscsi: Unused param for pscsi_get_bio()
target: Rename get_cdb_count to allocate_tasks
target: Make transport_generic_new_cmd() available for iscsi-target
target: Remove fabric callback to allocate iovecs
target: Fix transport_generic_new_cmd WRITE comment

(hch: Use __GFP_ZERO usage for alloc_pages() usage)

Signed-off-by: Andy Grover <agrover@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>

1 files changed, 20 insertions, 19 deletions

diff --git a/drivers/target/target_core_cdb.c b/drivers/target/target_core_cdb.c
index 8d5a0fc3a220..09ef3f811567 100644
--- a/drivers/target/target_core_cdb.c
+++ b/drivers/target/target_core_cdb.c
@@ -66,7 +66,7 @@ target_emulate_inquiry_std(struct se_cmd *cmd)
 {
 	struct se_lun *lun = cmd->se_lun;
 	struct se_device *dev = cmd->se_dev;
-	unsigned char *buf = cmd->t_task.t_task_buf;
+	unsigned char *buf = cmd->t_task_buf;
 
 	/*
 	 * Make sure we at least have 6 bytes of INQUIRY response
@@ -621,8 +621,8 @@ static int
 target_emulate_inquiry(struct se_cmd *cmd)
 {
 	struct se_device *dev = cmd->se_dev;
-	unsigned char *buf = cmd->t_task.t_task_buf;
-	unsigned char *cdb = cmd->t_task.t_task_cdb;
+	unsigned char *buf = cmd->t_task_buf;
+	unsigned char *cdb = cmd->t_task_cdb;
 
 	if (!(cdb[1] & 0x1))
 		return target_emulate_inquiry_std(cmd);
@@ -666,7 +666,7 @@ static int
 target_emulate_readcapacity(struct se_cmd *cmd)
 {
 	struct se_device *dev = cmd->se_dev;
-	unsigned char *buf = cmd->t_task.t_task_buf;
+	unsigned char *buf = cmd->t_task_buf;
 	unsigned long long blocks_long = dev->transport->get_blocks(dev);
 	u32 blocks;
 
@@ -696,7 +696,7 @@ static int
 target_emulate_readcapacity_16(struct se_cmd *cmd)
 {
 	struct se_device *dev = cmd->se_dev;
-	unsigned char *buf = cmd->t_task.t_task_buf;
+	unsigned char *buf = cmd->t_task_buf;
 	unsigned long long blocks = dev->transport->get_blocks(dev);
 
 	buf[0] = (blocks >> 56) & 0xff;
@@ -831,8 +831,8 @@ static int
 target_emulate_modesense(struct se_cmd *cmd, int ten)
 {
 	struct se_device *dev = cmd->se_dev;
-	char *cdb = cmd->t_task.t_task_cdb;
-	unsigned char *rbuf = cmd->t_task.t_task_buf;
+	char *cdb = cmd->t_task_cdb;
+	unsigned char *rbuf = cmd->t_task_buf;
 	int type = dev->transport->get_device_type(dev);
 	int offset = (ten) ? 8 : 4;
 	int length = 0;
@@ -903,8 +903,8 @@ target_emulate_modesense(struct se_cmd *cmd, int ten)
 static int
 target_emulate_request_sense(struct se_cmd *cmd)
 {
-	unsigned char *cdb = cmd->t_task.t_task_cdb;
-	unsigned char *buf = cmd->t_task.t_task_buf;
+	unsigned char *cdb = cmd->t_task_cdb;
+	unsigned char *buf = cmd->t_task_buf;
 	u8 ua_asc = 0, ua_ascq = 0;
 
 	if (cdb[1] & 0x01) {
@@ -965,8 +965,8 @@ target_emulate_unmap(struct se_task *task)
 {
 	struct se_cmd *cmd = task->task_se_cmd;
 	struct se_device *dev = cmd->se_dev;
-	unsigned char *buf = cmd->t_task.t_task_buf, *ptr = NULL;
-	unsigned char *cdb = &cmd->t_task.t_task_cdb[0];
+	unsigned char *buf = cmd->t_task_buf, *ptr = NULL;
+	unsigned char *cdb = &cmd->t_task_cdb[0];
 	sector_t lba;
 	unsigned int size = cmd->data_length, range;
 	int ret, offset;
@@ -1012,7 +1012,8 @@ target_emulate_write_same(struct se_task *task, int write_same32)
 {
 	struct se_cmd *cmd = task->task_se_cmd;
 	struct se_device *dev = cmd->se_dev;
-	sector_t range, lba = cmd->t_task.t_task_lba;
+	sector_t range;
+	sector_t lba = cmd->t_task_lba;
 	unsigned int num_blocks;
 	int ret;
 	/*
@@ -1021,9 +1022,9 @@ target_emulate_write_same(struct se_task *task, int write_same32)
 	 * range based on ->get_blocks() - starting LBA.
 	 */
 	if (write_same32)
-		num_blocks = get_unaligned_be32(&cmd->t_task.t_task_cdb[28]);
+		num_blocks = get_unaligned_be32(&cmd->t_task_cdb[28]);
 	else
-		num_blocks = get_unaligned_be32(&cmd->t_task.t_task_cdb[10]);
+		num_blocks = get_unaligned_be32(&cmd->t_task_cdb[10]);
 
 	if (num_blocks != 0)
 		range = num_blocks;
@@ -1052,7 +1053,7 @@ transport_emulate_control_cdb(struct se_task *task)
 	unsigned short service_action;
 	int ret = 0;
 
-	switch (cmd->t_task.t_task_cdb[0]) {
+	switch (cmd->t_task_cdb[0]) {
 	case INQUIRY:
 		ret = target_emulate_inquiry(cmd);
 		break;
@@ -1066,13 +1067,13 @@ transport_emulate_control_cdb(struct se_task *task)
 		ret = target_emulate_modesense(cmd, 1);
 		break;
 	case SERVICE_ACTION_IN:
-		switch (cmd->t_task.t_task_cdb[1] & 0x1f) {
+		switch (cmd->t_task_cdb[1] & 0x1f) {
 		case SAI_READ_CAPACITY_16:
 			ret = target_emulate_readcapacity_16(cmd);
 			break;
 		default:
 			printk(KERN_ERR "Unsupported SA: 0x%02x\n",
-				cmd->t_task.t_task_cdb[1] & 0x1f);
+				cmd->t_task_cdb[1] & 0x1f);
 			return PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
 		}
 		break;
@@ -1097,7 +1098,7 @@ transport_emulate_control_cdb(struct se_task *task)
 		break;
 	case VARIABLE_LENGTH_CMD:
 		service_action =
-			get_unaligned_be16(&cmd->t_task.t_task_cdb[8]);
+			get_unaligned_be16(&cmd->t_task_cdb[8]);
 		switch (service_action) {
 		case WRITE_SAME_32:
 			if (!dev->transport->do_discard) {
@@ -1136,7 +1137,7 @@ transport_emulate_control_cdb(struct se_task *task)
 		break;
 	default:
 		printk(KERN_ERR "Unsupported SCSI Opcode: 0x%02x for %s\n",
-			cmd->t_task.t_task_cdb[0], dev->transport->name);
+			cmd->t_task_cdb[0], dev->transport->name);
 		return PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
 	}