[PATCH 5/8] scsi: remove bidirectional command support

From: Christoph Hellwig
Date: Fri Feb 01 2019 - 02:56:31 EST

No real need for bidi support once the OSD code is gone.

Signed-off-by: Christoph Hellwig <hch@xxxxxx>
---
drivers/scsi/cxgbi/libcxgbi.c | 13 +++---
drivers/scsi/iscsi_tcp.c | 9 +----
drivers/scsi/libiscsi.c | 64 +++---------------------------
drivers/scsi/libiscsi_tcp.c | 8 ++--
drivers/scsi/scsi_debug.c | 51 +++++-------------------
drivers/scsi/scsi_error.c | 3 --
drivers/scsi/scsi_lib.c | 58 ++-------------------------
drivers/scsi/virtio_scsi.c | 14 ++-----
drivers/target/loopback/tcm_loop.c | 15 -------
drivers/usb/storage/uas.c | 11 +----
include/scsi/scsi_cmnd.h | 19 +--------
include/scsi/scsi_eh.h | 1 -
12 files changed, 35 insertions(+), 231 deletions(-)

diff --git a/drivers/scsi/cxgbi/libcxgbi.c b/drivers/scsi/cxgbi/libcxgbi.c
index 75f876409fb9..4466ae5c9a74 100644
--- a/drivers/scsi/cxgbi/libcxgbi.c
+++ b/drivers/scsi/cxgbi/libcxgbi.c
@@ -1211,7 +1211,7 @@ scmd_get_params(struct scsi_cmnd *sc, struct scatterlist **sgl,
unsigned int *sgcnt, unsigned int *dlen,
unsigned int prot)
{
- struct scsi_data_buffer *sdb = prot ? scsi_prot(sc) : scsi_out(sc);
+ struct scsi_data_buffer *sdb = prot ? scsi_prot(sc) : &sc->sdb;

*sgl = sdb->table.sgl;
*sgcnt = sdb->table.nents;
@@ -1427,8 +1427,7 @@ static void task_release_itt(struct iscsi_task *task, itt_t hdr_itt)
log_debug(1 << CXGBI_DBG_DDP,
"cdev 0x%p, task 0x%p, release tag 0x%x.\n",
cdev, task, tag);
- if (sc &&
- (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_FROM_DEVICE) &&
+ if (sc && sc->sc_data_direction == DMA_FROM_DEVICE &&
cxgbi_ppm_is_ddp_tag(ppm, tag)) {
struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
struct cxgbi_task_tag_info *ttinfo = &tdata->ttinfo;
@@ -1460,9 +1459,7 @@ static int task_reserve_itt(struct iscsi_task *task, itt_t *hdr_itt)
u32 tag = 0;
int err = -EINVAL;

- if (sc &&
- (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_FROM_DEVICE)
- ) {
+ if (sc && sc->sc_data_direction == DMA_FROM_DEVICE) {
struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
struct cxgbi_task_tag_info *ttinfo = &tdata->ttinfo;

@@ -1896,7 +1893,7 @@ int cxgbi_conn_alloc_pdu(struct iscsi_task *task, u8 opcode)
if (SKB_MAX_HEAD(cdev->skb_tx_rsvd) > (512 * MAX_SKB_FRAGS) &&
(opcode == ISCSI_OP_SCSI_DATA_OUT ||
(opcode == ISCSI_OP_SCSI_CMD &&
- (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_TO_DEVICE))))
+ sc->sc_data_direction == DMA_TO_DEVICE)))
/* data could goes into skb head */
headroom += min_t(unsigned int,
SKB_MAX_HEAD(cdev->skb_tx_rsvd),
@@ -1971,7 +1968,7 @@ int cxgbi_conn_init_pdu(struct iscsi_task *task, unsigned int offset,
return 0;

if (task->sc) {
- struct scsi_data_buffer *sdb = scsi_out(task->sc);
+ struct scsi_data_buffer *sdb = &task->sc->sdb;
struct scatterlist *sg = NULL;
int err;

diff --git a/drivers/scsi/iscsi_tcp.c b/drivers/scsi/iscsi_tcp.c
index cae6368ebb98..ed3debce2819 100644
--- a/drivers/scsi/iscsi_tcp.c
+++ b/drivers/scsi/iscsi_tcp.c
@@ -518,7 +518,7 @@ static int iscsi_sw_tcp_pdu_init(struct iscsi_task *task,
if (!task->sc)
iscsi_sw_tcp_send_linear_data_prep(conn, task->data, count);
else {
- struct scsi_data_buffer *sdb = scsi_out(task->sc);
+ struct scsi_data_buffer *sdb = &task->sc->sdb;

err = iscsi_sw_tcp_send_data_prep(conn, sdb->table.sgl,
sdb->table.nents, offset,
@@ -952,12 +952,6 @@ static umode_t iscsi_sw_tcp_attr_is_visible(int param_type, int param)
return 0;
}

-static int iscsi_sw_tcp_slave_alloc(struct scsi_device *sdev)
-{
- blk_queue_flag_set(QUEUE_FLAG_BIDI, sdev->request_queue);
- return 0;
-}
-
static int iscsi_sw_tcp_slave_configure(struct scsi_device *sdev)
{
struct iscsi_sw_tcp_host *tcp_sw_host = iscsi_host_priv(sdev->host);
@@ -985,7 +979,6 @@ static struct scsi_host_template iscsi_sw_tcp_sht = {
.eh_device_reset_handler= iscsi_eh_device_reset,
.eh_target_reset_handler = iscsi_eh_recover_target,
.dma_boundary = PAGE_SIZE - 1,
- .slave_alloc = iscsi_sw_tcp_slave_alloc,
.slave_configure = iscsi_sw_tcp_slave_configure,
.target_alloc = iscsi_target_alloc,
.proc_name = "iscsi_tcp",
diff --git a/drivers/scsi/libiscsi.c b/drivers/scsi/libiscsi.c
index b8d325ce8754..bca3a8636c27 100644
--- a/drivers/scsi/libiscsi.c
+++ b/drivers/scsi/libiscsi.c
@@ -228,32 +228,6 @@ static int iscsi_prep_ecdb_ahs(struct iscsi_task *task)
return 0;
}

-static int iscsi_prep_bidi_ahs(struct iscsi_task *task)
-{
- struct scsi_cmnd *sc = task->sc;
- struct iscsi_rlength_ahdr *rlen_ahdr;
- int rc;
-
- rlen_ahdr = iscsi_next_hdr(task);
- rc = iscsi_add_hdr(task, sizeof(*rlen_ahdr));
- if (rc)
- return rc;
-
- rlen_ahdr->ahslength =
- cpu_to_be16(sizeof(rlen_ahdr->read_length) +
- sizeof(rlen_ahdr->reserved));
- rlen_ahdr->ahstype = ISCSI_AHSTYPE_RLENGTH;
- rlen_ahdr->reserved = 0;
- rlen_ahdr->read_length = cpu_to_be32(scsi_in(sc)->length);
-
- ISCSI_DBG_SESSION(task->conn->session,
- "bidi-in rlen_ahdr->read_length(%d) "
- "rlen_ahdr->ahslength(%d)\n",
- be32_to_cpu(rlen_ahdr->read_length),
- be16_to_cpu(rlen_ahdr->ahslength));
- return 0;
-}
-
/**
* iscsi_check_tmf_restrictions - check if a task is affected by TMF
* @task: iscsi task
@@ -392,13 +366,6 @@ static int iscsi_prep_scsi_cmd_pdu(struct iscsi_task *task)
memcpy(hdr->cdb, sc->cmnd, cmd_len);

task->imm_count = 0;
- if (scsi_bidi_cmnd(sc)) {
- hdr->flags |= ISCSI_FLAG_CMD_READ;
- rc = iscsi_prep_bidi_ahs(task);
- if (rc)
- return rc;
- }
-
if (scsi_get_prot_op(sc) != SCSI_PROT_NORMAL)
task->protected = true;

@@ -473,12 +440,10 @@ static int iscsi_prep_scsi_cmd_pdu(struct iscsi_task *task)

conn->scsicmd_pdus_cnt++;
ISCSI_DBG_SESSION(session, "iscsi prep [%s cid %d sc %p cdb 0x%x "
- "itt 0x%x len %d bidi_len %d cmdsn %d win %d]\n",
- scsi_bidi_cmnd(sc) ? "bidirectional" :
+ "itt 0x%x len %d cmdsn %d win %d]\n",
sc->sc_data_direction == DMA_TO_DEVICE ?
"write" : "read", conn->id, sc, sc->cmnd[0],
task->itt, transfer_length,
- scsi_bidi_cmnd(sc) ? scsi_in(sc)->length : 0,
session->cmdsn,
session->max_cmdsn - session->exp_cmdsn + 1);
return 0;
@@ -647,12 +612,7 @@ static void fail_scsi_task(struct iscsi_task *task, int err)
state = ISCSI_TASK_ABRT_TMF;

sc->result = err << 16;
- if (!scsi_bidi_cmnd(sc))
- scsi_set_resid(sc, scsi_bufflen(sc));
- else {
- scsi_out(sc)->resid = scsi_out(sc)->length;
- scsi_in(sc)->resid = scsi_in(sc)->length;
- }
+ scsi_set_resid(sc, scsi_bufflen(sc));

/* regular RX path uses back_lock */
spin_lock_bh(&conn->session->back_lock);
@@ -907,14 +867,7 @@ static void iscsi_scsi_cmd_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr,

if (rhdr->flags & (ISCSI_FLAG_CMD_BIDI_UNDERFLOW |
ISCSI_FLAG_CMD_BIDI_OVERFLOW)) {
- int res_count = be32_to_cpu(rhdr->bi_residual_count);
-
- if (scsi_bidi_cmnd(sc) && res_count > 0 &&
- (rhdr->flags & ISCSI_FLAG_CMD_BIDI_OVERFLOW ||
- res_count <= scsi_in(sc)->length))
- scsi_in(sc)->resid = res_count;
- else
- sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
+ sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
}

if (rhdr->flags & (ISCSI_FLAG_CMD_UNDERFLOW |
@@ -961,8 +914,8 @@ iscsi_data_in_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr,

if (res_count > 0 &&
(rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW ||
- res_count <= scsi_in(sc)->length))
- scsi_in(sc)->resid = res_count;
+ res_count <= sc->sdb.length))
+ sc->sdb.resid = res_count;
else
sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
}
@@ -1804,12 +1757,7 @@ int iscsi_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *sc)
spin_unlock_bh(&session->frwd_lock);
ISCSI_DBG_SESSION(session, "iscsi: cmd 0x%x is not queued (%d)\n",
sc->cmnd[0], reason);
- if (!scsi_bidi_cmnd(sc))
- scsi_set_resid(sc, scsi_bufflen(sc));
- else {
- scsi_out(sc)->resid = scsi_out(sc)->length;
- scsi_in(sc)->resid = scsi_in(sc)->length;
- }
+ scsi_set_resid(sc, scsi_bufflen(sc));
sc->scsi_done(sc);
return 0;
}
diff --git a/drivers/scsi/libiscsi_tcp.c b/drivers/scsi/libiscsi_tcp.c
index 8a6b1b3f8277..9923e9e3b884 100644
--- a/drivers/scsi/libiscsi_tcp.c
+++ b/drivers/scsi/libiscsi_tcp.c
@@ -495,7 +495,7 @@ static int iscsi_tcp_data_in(struct iscsi_conn *conn, struct iscsi_task *task)
struct iscsi_tcp_task *tcp_task = task->dd_data;
struct iscsi_data_rsp *rhdr = (struct iscsi_data_rsp *)tcp_conn->in.hdr;
int datasn = be32_to_cpu(rhdr->datasn);
- unsigned total_in_length = scsi_in(task->sc)->length;
+ unsigned total_in_length = task->sc->sdb.length;

/*
* lib iscsi will update this in the completion handling if there
@@ -580,11 +580,11 @@ static int iscsi_tcp_r2t_rsp(struct iscsi_conn *conn, struct iscsi_task *task)
data_length, session->max_burst);

data_offset = be32_to_cpu(rhdr->data_offset);
- if (data_offset + data_length > scsi_out(task->sc)->length) {
+ if (data_offset + data_length > task->sc->sdb.length) {
iscsi_conn_printk(KERN_ERR, conn,
"invalid R2T with data len %u at offset %u "
"and total length %d\n", data_length,
- data_offset, scsi_out(task->sc)->length);
+ data_offset, task->sc->sdb.length);
return ISCSI_ERR_DATALEN;
}

@@ -696,7 +696,7 @@ iscsi_tcp_hdr_dissect(struct iscsi_conn *conn, struct iscsi_hdr *hdr)
if (tcp_conn->in.datalen) {
struct iscsi_tcp_task *tcp_task = task->dd_data;
struct ahash_request *rx_hash = NULL;
- struct scsi_data_buffer *sdb = scsi_in(task->sc);
+ struct scsi_data_buffer *sdb = &task->sc->sdb;

/*
* Setup copy of Data-In into the struct scsi_cmnd
diff --git a/drivers/scsi/scsi_debug.c b/drivers/scsi/scsi_debug.c
index 661512bec3ac..cb8b5dfe1fa9 100644
--- a/drivers/scsi/scsi_debug.c
+++ b/drivers/scsi/scsi_debug.c
@@ -430,7 +430,6 @@ static int resp_rsup_opcodes(struct scsi_cmnd *, struct sdebug_dev_info *);
static int resp_rsup_tmfs(struct scsi_cmnd *, struct sdebug_dev_info *);
static int resp_write_same_10(struct scsi_cmnd *, struct sdebug_dev_info *);
static int resp_write_same_16(struct scsi_cmnd *, struct sdebug_dev_info *);
-static int resp_xdwriteread_10(struct scsi_cmnd *, struct sdebug_dev_info *);
static int resp_comp_write(struct scsi_cmnd *, struct sdebug_dev_info *);
static int resp_write_buffer(struct scsi_cmnd *, struct sdebug_dev_info *);
static int resp_sync_cache(struct scsi_cmnd *, struct sdebug_dev_info *);
@@ -600,9 +599,6 @@ static const struct opcode_info_t opcode_info_arr[SDEB_I_LAST_ELEMENT + 1] = {
{0, 0x42, 0, F_D_OUT | FF_MEDIA_IO, resp_unmap, NULL, /* UNMAP */
{10, 0x1, 0, 0, 0, 0, 0x3f, 0xff, 0xff, 0xc7, 0, 0, 0, 0, 0, 0} },
/* 25 */
- {0, 0x53, 0, F_D_IN | F_D_OUT | FF_MEDIA_IO, resp_xdwriteread_10,
- NULL, {10, 0xff, 0xff, 0xff, 0xff, 0xff, 0x3f, 0xff, 0xff, 0xc7,
- 0, 0, 0, 0, 0, 0} }, /* XDWRITEREAD(10) */
{0, 0x3b, 0, F_D_OUT_MAYBE, resp_write_buffer, NULL,
{10, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xc7, 0, 0,
0, 0, 0, 0} }, /* WRITE_BUFFER */
@@ -1010,11 +1006,11 @@ static int fill_from_dev_buffer(struct scsi_cmnd *scp, unsigned char *arr,
int arr_len)
{
int act_len;
- struct scsi_data_buffer *sdb = scsi_in(scp);
+ struct scsi_data_buffer *sdb = &scp->sdb;

if (!sdb->length)
return 0;
- if (!(scsi_bidi_cmnd(scp) || scp->sc_data_direction == DMA_FROM_DEVICE))
+ if (scp->sc_data_direction != DMA_FROM_DEVICE)
return DID_ERROR << 16;

act_len = sg_copy_from_buffer(sdb->table.sgl, sdb->table.nents,
@@ -1033,12 +1029,12 @@ static int p_fill_from_dev_buffer(struct scsi_cmnd *scp, const void *arr,
int arr_len, unsigned int off_dst)
{
int act_len, n;
- struct scsi_data_buffer *sdb = scsi_in(scp);
+ struct scsi_data_buffer *sdb = &scp->sdb;
off_t skip = off_dst;

if (sdb->length <= off_dst)
return 0;
- if (!(scsi_bidi_cmnd(scp) || scp->sc_data_direction == DMA_FROM_DEVICE))
+ if (scp->sc_data_direction != DMA_FROM_DEVICE)
return DID_ERROR << 16;

act_len = sg_pcopy_from_buffer(sdb->table.sgl, sdb->table.nents,
@@ -1058,7 +1054,7 @@ static int fetch_to_dev_buffer(struct scsi_cmnd *scp, unsigned char *arr,
{
if (!scsi_bufflen(scp))
return 0;
- if (!(scsi_bidi_cmnd(scp) || scp->sc_data_direction == DMA_TO_DEVICE))
+ if (scp->sc_data_direction != DMA_TO_DEVICE)
return -1;

return scsi_sg_copy_to_buffer(scp, arr, arr_len);
@@ -2477,21 +2473,19 @@ static int do_device_access(struct scsi_cmnd *scmd, u32 sg_skip, u64 lba,
{
int ret;
u64 block, rest = 0;
- struct scsi_data_buffer *sdb;
+ struct scsi_data_buffer *sdb = &scmd->sdb;
enum dma_data_direction dir;

if (do_write) {
- sdb = scsi_out(scmd);
dir = DMA_TO_DEVICE;
write_since_sync = true;
} else {
- sdb = scsi_in(scmd);
dir = DMA_FROM_DEVICE;
}

if (!sdb->length)
return 0;
- if (!(scsi_bidi_cmnd(scmd) || scmd->sc_data_direction == dir))
+ if (scmd->sc_data_direction != dir)
return -1;

block = do_div(lba, sdebug_store_sectors);
@@ -2774,7 +2768,7 @@ static int resp_read_dt0(struct scsi_cmnd *scp, struct sdebug_dev_info *devip)
if (unlikely(ret == -1))
return DID_ERROR << 16;

- scsi_in(scp)->resid = scsi_bufflen(scp) - ret;
+ scp->sdb.resid = scsi_bufflen(scp) - ret;

if (unlikely(sqcp)) {
if (sqcp->inj_recovered) {
@@ -3724,7 +3718,7 @@ static int resp_xdwriteread(struct scsi_cmnd *scp, unsigned long long lba,
int j;
unsigned char *kaddr, *buf;
unsigned int offset;
- struct scsi_data_buffer *sdb = scsi_in(scp);
+ struct scsi_data_buffer *sdb = &scp->sdb;
struct sg_mapping_iter miter;

/* better not to use temporary buffer. */
@@ -3754,32 +3748,6 @@ static int resp_xdwriteread(struct scsi_cmnd *scp, unsigned long long lba,
return 0;
}

-static int resp_xdwriteread_10(struct scsi_cmnd *scp,
- struct sdebug_dev_info *devip)
-{
- u8 *cmd = scp->cmnd;
- u64 lba;
- u32 num;
- int errsts;
-
- if (!scsi_bidi_cmnd(scp)) {
- mk_sense_buffer(scp, ILLEGAL_REQUEST, INSUFF_RES_ASC,
- INSUFF_RES_ASCQ);
- return check_condition_result;
- }
- errsts = resp_read_dt0(scp, devip);
- if (errsts)
- return errsts;
- if (!(cmd[1] & 0x4)) { /* DISABLE_WRITE is not set */
- errsts = resp_write_dt0(scp, devip);
- if (errsts)
- return errsts;
- }
- lba = get_unaligned_be32(cmd + 2);
- num = get_unaligned_be16(cmd + 7);
- return resp_xdwriteread(scp, lba, num, devip);
-}
-
static struct sdebug_queue *get_queue(struct scsi_cmnd *cmnd)
{
u32 tag = blk_mq_unique_tag(cmnd->request);
@@ -3953,7 +3921,6 @@ static int scsi_debug_slave_alloc(struct scsi_device *sdp)
if (sdebug_verbose)
pr_info("slave_alloc <%u %u %u %llu>\n",
sdp->host->host_no, sdp->channel, sdp->id, sdp->lun);
- blk_queue_flag_set(QUEUE_FLAG_BIDI, sdp->request_queue);
return 0;
}

diff --git a/drivers/scsi/scsi_error.c b/drivers/scsi/scsi_error.c
index 16eef068e9e9..1b8378f36139 100644
--- a/drivers/scsi/scsi_error.c
+++ b/drivers/scsi/scsi_error.c
@@ -965,7 +965,6 @@ void scsi_eh_prep_cmnd(struct scsi_cmnd *scmd, struct scsi_eh_save *ses,
ses->cmnd = scmd->cmnd;
ses->data_direction = scmd->sc_data_direction;
ses->sdb = scmd->sdb;
- ses->next_rq = scmd->request->next_rq;
ses->result = scmd->result;
ses->underflow = scmd->underflow;
ses->prot_op = scmd->prot_op;
@@ -976,7 +975,6 @@ void scsi_eh_prep_cmnd(struct scsi_cmnd *scmd, struct scsi_eh_save *ses,
scmd->cmnd = ses->eh_cmnd;
memset(scmd->cmnd, 0, BLK_MAX_CDB);
memset(&scmd->sdb, 0, sizeof(scmd->sdb));
- scmd->request->next_rq = NULL;
scmd->result = 0;

if (sense_bytes) {
@@ -1029,7 +1027,6 @@ void scsi_eh_restore_cmnd(struct scsi_cmnd* scmd, struct scsi_eh_save *ses)
scmd->cmnd = ses->cmnd;
scmd->sc_data_direction = ses->data_direction;
scmd->sdb = ses->sdb;
- scmd->request->next_rq = ses->next_rq;
scmd->result = ses->result;
scmd->underflow = ses->underflow;
scmd->prot_op = ses->prot_op;
diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index 00cd365fb7d2..6fd1d8d83f07 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -560,11 +560,6 @@ static void scsi_mq_free_sgtables(struct scsi_cmnd *cmd)

if (cmd->sdb.table.nents)
sg_free_table_chained(&cmd->sdb.table, true);
- if (cmd->request->next_rq) {
- sdb = cmd->request->next_rq->special;
- if (sdb)
- sg_free_table_chained(&sdb->table, true);
- }
if (scsi_prot_sg_count(cmd))
sg_free_table_chained(&cmd->prot_sdb->table, true);
}
@@ -578,7 +573,7 @@ static void scsi_mq_uninit_cmd(struct scsi_cmnd *cmd)

/* Returns false when no more bytes to process, true if there are more */
static bool scsi_end_request(struct request *req, blk_status_t error,
- unsigned int bytes, unsigned int bidi_bytes)
+ unsigned int bytes)
{
struct scsi_cmnd *cmd = blk_mq_rq_to_pdu(req);
struct scsi_device *sdev = cmd->device;
@@ -587,11 +582,6 @@ static bool scsi_end_request(struct request *req, blk_status_t error,
if (blk_update_request(req, error, bytes))
return true;

- /* Bidi request must be completed as a whole */
- if (unlikely(bidi_bytes) &&
- blk_update_request(req->next_rq, error, bidi_bytes))
- return true;
-
if (blk_queue_add_random(q))
add_disk_randomness(req->rq_disk);

@@ -816,7 +806,7 @@ static void scsi_io_completion_action(struct scsi_cmnd *cmd, int result)
scsi_print_command(cmd);
}
}
- if (!scsi_end_request(req, blk_stat, blk_rq_err_bytes(req), 0))
+ if (!scsi_end_request(req, blk_stat, blk_rq_err_bytes(req)))
return;
/*FALLTHRU*/
case ACTION_REPREP:
@@ -951,29 +941,6 @@ void scsi_io_completion(struct scsi_cmnd *cmd, unsigned int good_bytes)
*/
scsi_req(req)->result = cmd->result;
scsi_req(req)->resid_len = scsi_get_resid(cmd);
-
- if (unlikely(scsi_bidi_cmnd(cmd))) {
- /*
- * Bidi commands Must be complete as a whole,
- * both sides at once.
- */
- scsi_req(req->next_rq)->resid_len = scsi_in(cmd)->resid;
- if (scsi_end_request(req, BLK_STS_OK, blk_rq_bytes(req),
- blk_rq_bytes(req->next_rq)))
- WARN_ONCE(true,
- "Bidi command with remaining bytes");
- return;
- }
- }
-
- /* no bidi support yet, other than in pass-through */
- if (unlikely(blk_bidi_rq(req))) {
- WARN_ONCE(true, "Only support bidi command in passthrough");
- scmd_printk(KERN_ERR, cmd, "Killing bidi command\n");
- if (scsi_end_request(req, BLK_STS_IOERR, blk_rq_bytes(req),
- blk_rq_bytes(req->next_rq)))
- WARN_ONCE(true, "Bidi command with remaining bytes");
- return;
}

/*
@@ -990,13 +957,13 @@ void scsi_io_completion(struct scsi_cmnd *cmd, unsigned int good_bytes)
* to retry code. Fast path should return in this block.
*/
if (likely(blk_rq_bytes(req) > 0 || blk_stat == BLK_STS_OK)) {
- if (likely(!scsi_end_request(req, blk_stat, good_bytes, 0)))
+ if (likely(!scsi_end_request(req, blk_stat, good_bytes)))
return; /* no bytes remaining */
}

/* Kill remainder if no retries. */
if (unlikely(blk_stat && scsi_noretry_cmd(cmd))) {
- if (scsi_end_request(req, blk_stat, blk_rq_bytes(req), 0))
+ if (scsi_end_request(req, blk_stat, blk_rq_bytes(req)))
WARN_ONCE(true,
"Bytes remaining after failed, no-retry command");
return;
@@ -1058,12 +1025,6 @@ blk_status_t scsi_init_io(struct scsi_cmnd *cmd)
if (ret)
return ret;

- if (blk_bidi_rq(rq)) {
- ret = scsi_init_sgtable(rq->next_rq, rq->next_rq->special);
- if (ret)
- goto out_free_sgtables;
- }
-
if (blk_integrity_rq(rq)) {
struct scsi_data_buffer *prot_sdb = cmd->prot_sdb;
int ivecs, count;
@@ -1624,17 +1585,6 @@ static blk_status_t scsi_mq_prep_fn(struct request *req)
(struct scatterlist *)(cmd->prot_sdb + 1);
}

- if (blk_bidi_rq(req)) {
- struct request *next_rq = req->next_rq;
- struct scsi_data_buffer *bidi_sdb = blk_mq_rq_to_pdu(next_rq);
-
- memset(bidi_sdb, 0, sizeof(struct scsi_data_buffer));
- bidi_sdb->table.sgl =
- (struct scatterlist *)(bidi_sdb + 1);
-
- next_rq->special = bidi_sdb;
- }
-
blk_mq_start_request(req);

return scsi_setup_cmnd(sdev, req);
diff --git a/drivers/scsi/virtio_scsi.c b/drivers/scsi/virtio_scsi.c
index 772b976e4ee4..1a6f150cd2d8 100644
--- a/drivers/scsi/virtio_scsi.c
+++ b/drivers/scsi/virtio_scsi.c
@@ -100,16 +100,8 @@ static inline struct Scsi_Host *virtio_scsi_host(struct virtio_device *vdev)

static void virtscsi_compute_resid(struct scsi_cmnd *sc, u32 resid)
{
- if (!resid)
- return;
-
- if (!scsi_bidi_cmnd(sc)) {
+ if (resid)
scsi_set_resid(sc, resid);
- return;
- }
-
- scsi_in(sc)->resid = min(resid, scsi_in(sc)->length);
- scsi_out(sc)->resid = resid - scsi_in(sc)->resid;
}

/**
@@ -403,9 +395,9 @@ static int virtscsi_add_cmd(struct virtqueue *vq,

if (sc && sc->sc_data_direction != DMA_NONE) {
if (sc->sc_data_direction != DMA_FROM_DEVICE)
- out = &scsi_out(sc)->table;
+ out = &sc->sdb.table;
if (sc->sc_data_direction != DMA_TO_DEVICE)
- in = &scsi_in(sc)->table;
+ in = &sc->sdb.table;
}

/* Request header. */
diff --git a/drivers/target/loopback/tcm_loop.c b/drivers/target/loopback/tcm_loop.c
index 7bd7c0c0db6f..757d4a8eba32 100644
--- a/drivers/target/loopback/tcm_loop.c
+++ b/drivers/target/loopback/tcm_loop.c
@@ -128,14 +128,6 @@ static void tcm_loop_submission_work(struct work_struct *work)
set_host_byte(sc, DID_ERROR);
goto out_done;
}
- if (scsi_bidi_cmnd(sc)) {
- struct scsi_data_buffer *sdb = scsi_in(sc);
-
- sgl_bidi = sdb->table.sgl;
- sgl_bidi_count = sdb->table.nents;
- se_cmd->se_cmd_flags |= SCF_BIDI;
-
- }

transfer_length = scsi_transfer_length(sc);
if (!scsi_prot_sg_count(sc) &&
@@ -304,12 +296,6 @@ static int tcm_loop_target_reset(struct scsi_cmnd *sc)
return FAILED;
}

-static int tcm_loop_slave_alloc(struct scsi_device *sd)
-{
- blk_queue_flag_set(QUEUE_FLAG_BIDI, sd->request_queue);
- return 0;
-}
-
static struct scsi_host_template tcm_loop_driver_template = {
.show_info = tcm_loop_show_info,
.proc_name = "tcm_loopback",
@@ -325,7 +311,6 @@ static struct scsi_host_template tcm_loop_driver_template = {
.cmd_per_lun = 1024,
.max_sectors = 0xFFFF,
.dma_boundary = PAGE_SIZE - 1,
- .slave_alloc = tcm_loop_slave_alloc,
.module = THIS_MODULE,
.track_queue_depth = 1,
};
diff --git a/drivers/usb/storage/uas.c b/drivers/usb/storage/uas.c
index 36742e8e7edc..95f2142093d5 100644
--- a/drivers/usb/storage/uas.c
+++ b/drivers/usb/storage/uas.c
@@ -368,25 +368,19 @@ static void uas_data_cmplt(struct urb *urb)
struct scsi_cmnd *cmnd = urb->context;
struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
struct uas_dev_info *devinfo = (void *)cmnd->device->hostdata;
- struct scsi_data_buffer *sdb = NULL;
+ struct scsi_data_buffer *sdb = &cmnd->sdb;
unsigned long flags;
int status = urb->status;

spin_lock_irqsave(&devinfo->lock, flags);

if (cmdinfo->data_in_urb == urb) {
- sdb = scsi_in(cmnd);
cmdinfo->state &= ~DATA_IN_URB_INFLIGHT;
cmdinfo->data_in_urb = NULL;
} else if (cmdinfo->data_out_urb == urb) {
- sdb = scsi_out(cmnd);
cmdinfo->state &= ~DATA_OUT_URB_INFLIGHT;
cmdinfo->data_out_urb = NULL;
}
- if (sdb == NULL) {
- WARN_ON_ONCE(1);
- goto out;
- }

if (devinfo->resetting)
goto out;
@@ -426,8 +420,7 @@ static struct urb *uas_alloc_data_urb(struct uas_dev_info *devinfo, gfp_t gfp,
struct usb_device *udev = devinfo->udev;
struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
struct urb *urb = usb_alloc_urb(0, gfp);
- struct scsi_data_buffer *sdb = (dir == DMA_FROM_DEVICE)
- ? scsi_in(cmnd) : scsi_out(cmnd);
+ struct scsi_data_buffer *sdb = &cmnd->sdb;
unsigned int pipe = (dir == DMA_FROM_DEVICE)
? devinfo->data_in_pipe : devinfo->data_out_pipe;

diff --git a/include/scsi/scsi_cmnd.h b/include/scsi/scsi_cmnd.h
index d85e6befa26b..af6ae3e1eba6 100644
--- a/include/scsi/scsi_cmnd.h
+++ b/include/scsi/scsi_cmnd.h
@@ -213,23 +213,6 @@ static inline int scsi_get_resid(struct scsi_cmnd *cmd)
#define scsi_for_each_sg(cmd, sg, nseg, __i) \
for_each_sg(scsi_sglist(cmd), sg, nseg, __i)

-static inline int scsi_bidi_cmnd(struct scsi_cmnd *cmd)
-{
- return blk_bidi_rq(cmd->request) &&
- (cmd->request->next_rq->special != NULL);
-}
-
-static inline struct scsi_data_buffer *scsi_in(struct scsi_cmnd *cmd)
-{
- return scsi_bidi_cmnd(cmd) ?
- cmd->request->next_rq->special : &cmd->sdb;
-}
-
-static inline struct scsi_data_buffer *scsi_out(struct scsi_cmnd *cmd)
-{
- return &cmd->sdb;
-}
-
static inline int scsi_sg_copy_from_buffer(struct scsi_cmnd *cmd,
void *buf, int buflen)
{
@@ -351,7 +334,7 @@ static inline void set_driver_byte(struct scsi_cmnd *cmd, char status)

static inline unsigned scsi_transfer_length(struct scsi_cmnd *scmd)
{
- unsigned int xfer_len = scsi_out(scmd)->length;
+ unsigned int xfer_len = scmd->sdb.length;
unsigned int prot_interval = scsi_prot_interval(scmd);

if (scmd->prot_flags & SCSI_PROT_TRANSFER_PI)
diff --git a/include/scsi/scsi_eh.h b/include/scsi/scsi_eh.h
index 2b7e227960e1..3810b340551c 100644
--- a/include/scsi/scsi_eh.h
+++ b/include/scsi/scsi_eh.h
@@ -39,7 +39,6 @@ struct scsi_eh_save {
unsigned char prot_op;
unsigned char *cmnd;
struct scsi_data_buffer sdb;
- struct request *next_rq;
/* new command support */
unsigned char eh_cmnd[BLK_MAX_CDB];
struct scatterlist sense_sgl;
--
2.20.1