[PATCH 6.1 038/208] use less confusing names for iov_iter direction initializers

7 Feb 2023

diff --git a/arch/s390/kernel/crash_dump.c b/arch/s390/kernel/crash_dump.c
index a19a2763e8d4..c13b1455ec8c 100644
--- a/arch/s390/kernel/crash_dump.c
+++ b/arch/s390/kernel/crash_dump.c
@@ -153,7 +153,7 @@ int copy_oldmem_kernel(void *dst, unsigned long src, size_t count)
kvec.iov_base = dst;
    kvec.iov_len = count;
-	iov_iter_kvec(&iter, READ, &kvec, 1, count);
+	iov_iter_kvec(&iter, ITER_DEST, &kvec, 1, count);
    if (copy_oldmem_iter(&iter, src, count) < count)
    	return -EFAULT;
    return 0;
diff --git a/arch/s390/mm/maccess.c b/arch/s390/mm/maccess.c
index 753b006c8ea5..4824d1cd33d8 100644
--- a/arch/s390/mm/maccess.c
+++ b/arch/s390/mm/maccess.c
@@ -128,7 +128,7 @@ int memcpy_real(void *dest, unsigned long src, size_t count)
kvec.iov_base = dest;
    kvec.iov_len = count;
-	iov_iter_kvec(&iter, READ, &kvec, 1, count);
+	iov_iter_kvec(&iter, ITER_DEST, &kvec, 1, count);
    if (memcpy_real_iter(&iter, src, count) < count)
    	return -EFAULT;
    return 0;
diff --git a/arch/x86/kernel/cpu/microcode/intel.c b/arch/x86/kernel/cpu/microcode/intel.c
index 048e38ec99e7..1def66118b03 100644
--- a/arch/x86/kernel/cpu/microcode/intel.c
+++ b/arch/x86/kernel/cpu/microcode/intel.c
@@ -902,7 +902,7 @@ static enum ucode_state request_microcode_fw(int cpu, struct device *device,
kvec.iov_base = (void *)firmware->data;
    kvec.iov_len = firmware->size;
-	iov_iter_kvec(&iter, WRITE, &kvec, 1, firmware->size);
+	iov_iter_kvec(&iter, ITER_SOURCE, &kvec, 1, firmware->size);
    ret = generic_load_microcode(cpu, &iter);
release_firmware(firmware);
diff --git a/arch/x86/kernel/crash_dump_64.c b/arch/x86/kernel/crash_dump_64.c
index e75bc2f217ff..32d710f7eb84 100644
--- a/arch/x86/kernel/crash_dump_64.c
+++ b/arch/x86/kernel/crash_dump_64.c
@@ -57,7 +57,7 @@ ssize_t elfcorehdr_read(char *buf, size_t count, u64 *ppos)
    struct kvec kvec = { .iov_base = buf, .iov_len = count };
    struct iov_iter iter;
-	iov_iter_kvec(&iter, READ, &kvec, 1, count);
+	iov_iter_kvec(&iter, ITER_DEST, &kvec, 1, count);
return read_from_oldmem(&iter, count, ppos,
    			cc_platform_has(CC_ATTR_GUEST_MEM_ENCRYPT));
diff --git a/crypto/testmgr.c b/crypto/testmgr.c
index bcd059caa1c8..814d2dc87d7e 100644
--- a/crypto/testmgr.c
+++ b/crypto/testmgr.c
@@ -766,7 +766,7 @@ static int build_cipher_test_sglists(struct cipher_test_sglists *tsgls,
    struct iov_iter input;
    int err;
-	iov_iter_kvec(&input, WRITE, inputs, nr_inputs, src_total_len);
+	iov_iter_kvec(&input, ITER_SOURCE, inputs, nr_inputs, src_total_len);
    err = build_test_sglist(&tsgls->src, cfg->src_divs, alignmask,
    			cfg->inplace_mode != OUT_OF_PLACE ?
    				max(dst_total_len, src_total_len) :
@@ -1180,7 +1180,7 @@ static int build_hash_sglist(struct test_sglist *tsgl,
kv.iov_base = (void *)vec->plaintext;
    kv.iov_len = vec->psize;
-	iov_iter_kvec(&input, WRITE, &kv, 1, vec->psize);
+	iov_iter_kvec(&input, ITER_SOURCE, &kv, 1, vec->psize);
    return build_test_sglist(tsgl, cfg->src_divs, alignmask, vec->psize,
    			 &input, divs);
 }
diff --git a/drivers/acpi/pfr_update.c b/drivers/acpi/pfr_update.c
index 9d2bdc13253a..98267f163e2b 100644
--- a/drivers/acpi/pfr_update.c
+++ b/drivers/acpi/pfr_update.c
@@ -455,7 +455,7 @@ static ssize_t pfru_write(struct file *file, const char __user *buf,
iov.iov_base = (void __user *)buf;
    iov.iov_len = len;
-	iov_iter_init(&iter, WRITE, &iov, 1, len);
+	iov_iter_init(&iter, ITER_SOURCE, &iov, 1, len);
/* map the communication buffer */
    phy_addr = (phys_addr_t)((buf_info.addr_hi << 32) | buf_info.addr_lo);
diff --git a/drivers/block/drbd/drbd_main.c b/drivers/block/drbd/drbd_main.c
index 677240232684..590d1b50ab5d 100644
--- a/drivers/block/drbd/drbd_main.c
+++ b/drivers/block/drbd/drbd_main.c
@@ -1816,7 +1816,7 @@ int drbd_send(struct drbd_connection *connection, struct socket *sock,
/* THINK  if (signal_pending) return ... ? */
-	iov_iter_kvec(&msg.msg_iter, WRITE, &iov, 1, size);
+	iov_iter_kvec(&msg.msg_iter, ITER_SOURCE, &iov, 1, size);
if (sock == connection->data.socket) {
    	rcu_read_lock();
diff --git a/drivers/block/drbd/drbd_receiver.c b/drivers/block/drbd/drbd_receiver.c
index ee69d50ba4fd..54010eac6ca9 100644
--- a/drivers/block/drbd/drbd_receiver.c
+++ b/drivers/block/drbd/drbd_receiver.c
@@ -507,7 +507,7 @@ static int drbd_recv_short(struct socket *sock, void *buf, size_t size, int flag
    struct msghdr msg = {
    	.msg_flags = (flags ? flags : MSG_WAITALL | MSG_NOSIGNAL)
    };
-	iov_iter_kvec(&msg.msg_iter, READ, &iov, 1, size);
+	iov_iter_kvec(&msg.msg_iter, ITER_DEST, &iov, 1, size);
    return sock_recvmsg(sock, &msg, msg.msg_flags);
 }
diff --git a/drivers/block/loop.c b/drivers/block/loop.c
index d12d3d171ec4..df628e30bca4 100644
--- a/drivers/block/loop.c
+++ b/drivers/block/loop.c
@@ -243,7 +243,7 @@ static int lo_write_bvec(struct file *file, struct bio_vec *bvec, loff_t *ppos)
    struct iov_iter i;
    ssize_t bw;
-	iov_iter_bvec(&i, WRITE, bvec, 1, bvec->bv_len);
+	iov_iter_bvec(&i, ITER_SOURCE, bvec, 1, bvec->bv_len);
file_start_write(file);
    bw = vfs_iter_write(file, &i, ppos, 0);
@@ -286,7 +286,7 @@ static int lo_read_simple(struct loop_device *lo, struct request *rq,
    ssize_t len;
rq_for_each_segment(bvec, rq, iter) {
-		iov_iter_bvec(&i, READ, &bvec, 1, bvec.bv_len);
+		iov_iter_bvec(&i, ITER_DEST, &bvec, 1, bvec.bv_len);
    	len = vfs_iter_read(lo->lo_backing_file, &i, &pos, 0);
    	if (len < 0)
    		return len;
@@ -392,7 +392,7 @@ static void lo_rw_aio_complete(struct kiocb *iocb, long ret)
 }
static int lo_rw_aio(struct loop_device *lo, struct loop_cmd *cmd,
-		     loff_t pos, bool rw)
+		     loff_t pos, int rw)
 {
    struct iov_iter iter;
    struct req_iterator rq_iter;
@@ -448,7 +448,7 @@ static int lo_rw_aio(struct loop_device *lo, struct loop_cmd *cmd,
    cmd->iocb.ki_flags = IOCB_DIRECT;
    cmd->iocb.ki_ioprio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_NONE, 0);
-	if (rw == WRITE)
+	if (rw == ITER_SOURCE)
    	ret = call_write_iter(file, &cmd->iocb, &iter);
    else
    	ret = call_read_iter(file, &cmd->iocb, &iter);
@@ -490,12 +490,12 @@ static int do_req_filebacked(struct loop_device *lo, struct request *rq)
    	return lo_fallocate(lo, rq, pos, FALLOC_FL_PUNCH_HOLE);
    case REQ_OP_WRITE:
    	if (cmd->use_aio)
-			return lo_rw_aio(lo, cmd, pos, WRITE);
+			return lo_rw_aio(lo, cmd, pos, ITER_SOURCE);
    	else
    		return lo_write_simple(lo, rq, pos);
    case REQ_OP_READ:
    	if (cmd->use_aio)
-			return lo_rw_aio(lo, cmd, pos, READ);
+			return lo_rw_aio(lo, cmd, pos, ITER_DEST);
    	else
    		return lo_read_simple(lo, rq, pos);
    default:
diff --git a/drivers/block/nbd.c b/drivers/block/nbd.c
index 5cffd96ef2d7..e379ccc63c52 100644
--- a/drivers/block/nbd.c
+++ b/drivers/block/nbd.c
@@ -563,7 +563,7 @@ static int nbd_send_cmd(struct nbd_device *nbd, struct nbd_cmd *cmd, int index)
    u32 nbd_cmd_flags = 0;
    int sent = nsock->sent, skip = 0;
-	iov_iter_kvec(&from, WRITE, &iov, 1, sizeof(request));
+	iov_iter_kvec(&from, ITER_SOURCE, &iov, 1, sizeof(request));
type = req_to_nbd_cmd_type(req);
    if (type == U32_MAX)
@@ -649,7 +649,7 @@ static int nbd_send_cmd(struct nbd_device *nbd, struct nbd_cmd *cmd, int index)
dev_dbg(nbd_to_dev(nbd), "request %p: sending %d bytes data\n",
    			req, bvec.bv_len);
-			iov_iter_bvec(&from, WRITE, &bvec, 1, bvec.bv_len);
+			iov_iter_bvec(&from, ITER_SOURCE, &bvec, 1, bvec.bv_len);
    		if (skip) {
    			if (skip >= iov_iter_count(&from)) {
    				skip -= iov_iter_count(&from);
@@ -701,7 +701,7 @@ static int nbd_read_reply(struct nbd_device *nbd, int index,
    int result;
reply->magic = 0;
-	iov_iter_kvec(&to, READ, &iov, 1, sizeof(*reply));
+	iov_iter_kvec(&to, ITER_DEST, &iov, 1, sizeof(*reply));
    result = sock_xmit(nbd, index, 0, &to, MSG_WAITALL, NULL);
    if (result < 0) {
    	if (!nbd_disconnected(nbd->config))
@@ -790,7 +790,7 @@ static struct nbd_cmd *nbd_handle_reply(struct nbd_device *nbd, int index,
    	struct iov_iter to;
rq_for_each_segment(bvec, req, iter) {
-			iov_iter_bvec(&to, READ, &bvec, 1, bvec.bv_len);
+			iov_iter_bvec(&to, ITER_DEST, &bvec, 1, bvec.bv_len);
    		result = sock_xmit(nbd, index, 0, &to, MSG_WAITALL, NULL);
    		if (result < 0) {
    			dev_err(disk_to_dev(nbd->disk), "Receive data failed (result %d)\n",
@@ -1267,7 +1267,7 @@ static void send_disconnects(struct nbd_device *nbd)
    for (i = 0; i < config->num_connections; i++) {
    	struct nbd_sock *nsock = config->socks[i];
-		iov_iter_kvec(&from, WRITE, &iov, 1, sizeof(request));
+		iov_iter_kvec(&from, ITER_SOURCE, &iov, 1, sizeof(request));
    	mutex_lock(&nsock->tx_lock);
    	ret = sock_xmit(nbd, i, 1, &from, 0, NULL);
    	if (ret < 0)
diff --git a/drivers/char/random.c b/drivers/char/random.c
index f5868dddbb61..5d1c8e1c99b5 100644
--- a/drivers/char/random.c
+++ b/drivers/char/random.c
@@ -1329,7 +1329,7 @@ SYSCALL_DEFINE3(getrandom, char __user *, ubuf, size_t, len, unsigned int, flags
    		return ret;
    }
-	ret = import_single_range(READ, ubuf, len, &iov, &iter);
+	ret = import_single_range(ITER_DEST, ubuf, len, &iov, &iter);
    if (unlikely(ret))
    	return ret;
    return get_random_bytes_user(&iter);
@@ -1447,7 +1447,7 @@ static long random_ioctl(struct file *f, unsigned int cmd, unsigned long arg)
    		return -EINVAL;
    	if (get_user(len, p++))
    		return -EFAULT;
-		ret = import_single_range(WRITE, p, len, &iov, &iter);
+		ret = import_single_range(ITER_SOURCE, p, len, &iov, &iter);
    	if (unlikely(ret))
    		return ret;
    	ret = write_pool_user(&iter);
diff --git a/drivers/fsi/fsi-sbefifo.c b/drivers/fsi/fsi-sbefifo.c
index efd4942aa043..9912b7a6a4b9 100644
--- a/drivers/fsi/fsi-sbefifo.c
+++ b/drivers/fsi/fsi-sbefifo.c
@@ -659,7 +659,7 @@ static void sbefifo_collect_async_ffdc(struct sbefifo *sbefifo)
    }
         ffdc_iov.iov_base = ffdc;
    ffdc_iov.iov_len = SBEFIFO_MAX_FFDC_SIZE;
-        iov_iter_kvec(&ffdc_iter, READ, &ffdc_iov, 1, SBEFIFO_MAX_FFDC_SIZE);
+        iov_iter_kvec(&ffdc_iter, ITER_DEST, &ffdc_iov, 1, SBEFIFO_MAX_FFDC_SIZE);
    cmd[0] = cpu_to_be32(2);
    cmd[1] = cpu_to_be32(SBEFIFO_CMD_GET_SBE_FFDC);
    rc = sbefifo_do_command(sbefifo, cmd, 2, &ffdc_iter);
@@ -756,7 +756,7 @@ int sbefifo_submit(struct device *dev, const __be32 *command, size_t cmd_len,
    rbytes = (*resp_len) * sizeof(__be32);
    resp_iov.iov_base = response;
    resp_iov.iov_len = rbytes;
-        iov_iter_kvec(&resp_iter, READ, &resp_iov, 1, rbytes);
+        iov_iter_kvec(&resp_iter, ITER_DEST, &resp_iov, 1, rbytes);
/* Perform the command */
    rc = mutex_lock_interruptible(&sbefifo->lock);
@@ -839,7 +839,7 @@ static ssize_t sbefifo_user_read(struct file *file, char __user *buf,
    /* Prepare iov iterator */
    resp_iov.iov_base = buf;
    resp_iov.iov_len = len;
-	iov_iter_init(&resp_iter, READ, &resp_iov, 1, len);
+	iov_iter_init(&resp_iter, ITER_DEST, &resp_iov, 1, len);
/* Perform the command */
    rc = mutex_lock_interruptible(&sbefifo->lock);
diff --git a/drivers/infiniband/ulp/rtrs/rtrs-clt.c b/drivers/infiniband/ulp/rtrs/rtrs-clt.c
index 88282b288abd..730f2f1e09bb 100644
--- a/drivers/infiniband/ulp/rtrs/rtrs-clt.c
+++ b/drivers/infiniband/ulp/rtrs/rtrs-clt.c
@@ -966,7 +966,7 @@ static void rtrs_clt_init_req(struct rtrs_clt_io_req *req,
    refcount_set(&req->ref, 1);
    req->mp_policy = clt_path->clt->mp_policy;
-	iov_iter_kvec(&iter, WRITE, vec, 1, usr_len);
+	iov_iter_kvec(&iter, ITER_SOURCE, vec, 1, usr_len);
    len = _copy_from_iter(req->iu->buf, usr_len, &iter);
    WARN_ON(len != usr_len);
diff --git a/drivers/isdn/mISDN/l1oip_core.c b/drivers/isdn/mISDN/l1oip_core.c
index a77195e378b7..c24771336f61 100644
--- a/drivers/isdn/mISDN/l1oip_core.c
+++ b/drivers/isdn/mISDN/l1oip_core.c
@@ -706,7 +706,7 @@ l1oip_socket_thread(void *data)
    	printk(KERN_DEBUG "%s: socket created and open\n",
    	       __func__);
    while (!signal_pending(current)) {
-		iov_iter_kvec(&msg.msg_iter, READ, &iov, 1, recvbuf_size);
+		iov_iter_kvec(&msg.msg_iter, ITER_DEST, &iov, 1, recvbuf_size);
    	recvlen = sock_recvmsg(socket, &msg, 0);
    	if (recvlen > 0) {
    		l1oip_socket_parse(hc, &sin_rx, recvbuf, recvlen);
diff --git a/drivers/misc/vmw_vmci/vmci_queue_pair.c b/drivers/misc/vmw_vmci/vmci_queue_pair.c
index 844264e1b88c..73d71c4ec139 100644
--- a/drivers/misc/vmw_vmci/vmci_queue_pair.c
+++ b/drivers/misc/vmw_vmci/vmci_queue_pair.c
@@ -3044,7 +3044,7 @@ ssize_t vmci_qpair_enqueue(struct vmci_qp *qpair,
    if (!qpair || !buf)
    	return VMCI_ERROR_INVALID_ARGS;
-	iov_iter_kvec(&from, WRITE, &v, 1, buf_size);
+	iov_iter_kvec(&from, ITER_SOURCE, &v, 1, buf_size);
qp_lock(qpair);
@@ -3088,7 +3088,7 @@ ssize_t vmci_qpair_dequeue(struct vmci_qp *qpair,
    if (!qpair || !buf)
    	return VMCI_ERROR_INVALID_ARGS;
-	iov_iter_kvec(&to, READ, &v, 1, buf_size);
+	iov_iter_kvec(&to, ITER_DEST, &v, 1, buf_size);
qp_lock(qpair);
@@ -3133,7 +3133,7 @@ ssize_t vmci_qpair_peek(struct vmci_qp *qpair,
    if (!qpair || !buf)
    	return VMCI_ERROR_INVALID_ARGS;
-	iov_iter_kvec(&to, READ, &v, 1, buf_size);
+	iov_iter_kvec(&to, ITER_DEST, &v, 1, buf_size);
qp_lock(qpair);
diff --git a/drivers/net/ppp/ppp_generic.c b/drivers/net/ppp/ppp_generic.c
index d4c821c8cf57..1d71f5276241 100644
--- a/drivers/net/ppp/ppp_generic.c
+++ b/drivers/net/ppp/ppp_generic.c
@@ -480,7 +480,7 @@ static ssize_t ppp_read(struct file *file, char __user *buf,
    ret = -EFAULT;
    iov.iov_base = buf;
    iov.iov_len = count;
-	iov_iter_init(&to, READ, &iov, 1, count);
+	iov_iter_init(&to, ITER_DEST, &iov, 1, count);
    if (skb_copy_datagram_iter(skb, 0, &to, skb->len))
    	goto outf;
    ret = skb->len;
diff --git a/drivers/nvme/host/tcp.c b/drivers/nvme/host/tcp.c
index eacd445b5333..4c052c261517 100644
--- a/drivers/nvme/host/tcp.c
+++ b/drivers/nvme/host/tcp.c
@@ -301,7 +301,7 @@ static inline void nvme_tcp_advance_req(struct nvme_tcp_request *req,
    if (!iov_iter_count(&req->iter) &&
        req->data_sent < req->data_len) {
    	req->curr_bio = req->curr_bio->bi_next;
-		nvme_tcp_init_iter(req, WRITE);
+		nvme_tcp_init_iter(req, ITER_SOURCE);
    }
 }
@@ -781,7 +781,7 @@ static int nvme_tcp_recv_data(struct nvme_tcp_queue *queue, struct sk_buff *skb,
    			nvme_tcp_init_recv_ctx(queue);
    			return -EIO;
    		}
-			nvme_tcp_init_iter(req, READ);
+			nvme_tcp_init_iter(req, ITER_DEST);
    	}
/* we can read only from what is left in this bio */
diff --git a/drivers/nvme/target/io-cmd-file.c b/drivers/nvme/target/io-cmd-file.c
index e55ec6fefd7f..871c4f32f443 100644
--- a/drivers/nvme/target/io-cmd-file.c
+++ b/drivers/nvme/target/io-cmd-file.c
@@ -92,10 +92,10 @@ static ssize_t nvmet_file_submit_bvec(struct nvmet_req *req, loff_t pos,
    	if (req->cmd->rw.control & cpu_to_le16(NVME_RW_FUA))
    		ki_flags |= IOCB_DSYNC;
    	call_iter = req->ns->file->f_op->write_iter;
-		rw = WRITE;
+		rw = ITER_SOURCE;
    } else {
    	call_iter = req->ns->file->f_op->read_iter;
-		rw = READ;
+		rw = ITER_DEST;
    }
iov_iter_bvec(&iter, rw, req->f.bvec, nr_segs, count);
diff --git a/drivers/nvme/target/tcp.c b/drivers/nvme/target/tcp.c
index 6c1476e086ef..cc05c094de22 100644
--- a/drivers/nvme/target/tcp.c
+++ b/drivers/nvme/target/tcp.c
@@ -331,7 +331,7 @@ static void nvmet_tcp_build_pdu_iovec(struct nvmet_tcp_cmd *cmd)
    	sg_offset = 0;
    }
-	iov_iter_bvec(&cmd->recv_msg.msg_iter, READ, cmd->iov,
+	iov_iter_bvec(&cmd->recv_msg.msg_iter, ITER_DEST, cmd->iov,
    	      nr_pages, cmd->pdu_len);
 }
diff --git a/drivers/s390/char/zcore.c b/drivers/s390/char/zcore.c
index 83ddac1e5838..a41833557d55 100644
--- a/drivers/s390/char/zcore.c
+++ b/drivers/s390/char/zcore.c
@@ -103,7 +103,7 @@ static inline int memcpy_hsa_kernel(void *dst, unsigned long src, size_t count)
kvec.iov_base = dst;
    kvec.iov_len = count;
-	iov_iter_kvec(&iter, READ, &kvec, 1, count);
+	iov_iter_kvec(&iter, ITER_DEST, &kvec, 1, count);
    if (memcpy_hsa_iter(&iter, src, count) < count)
    	return -EIO;
    return 0;
diff --git a/drivers/scsi/sg.c b/drivers/scsi/sg.c
index ce34a8ad53b4..12344be14232 100644
--- a/drivers/scsi/sg.c
+++ b/drivers/scsi/sg.c
@@ -1726,7 +1726,7 @@ sg_start_req(Sg_request *srp, unsigned char *cmd)
    Sg_scatter_hold *rsv_schp = &sfp->reserve;
    struct request_queue *q = sfp->parentdp->device->request_queue;
    struct rq_map_data *md, map_data;
-	int rw = hp->dxfer_direction == SG_DXFER_TO_DEV ? WRITE : READ;
+	int rw = hp->dxfer_direction == SG_DXFER_TO_DEV ? ITER_SOURCE : ITER_DEST;
    struct scsi_cmnd *scmd;
SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp,
diff --git a/drivers/target/iscsi/iscsi_target_util.c b/drivers/target/iscsi/iscsi_target_util.c
index 8d9f21372b67..26dc8ed3045b 100644
--- a/drivers/target/iscsi/iscsi_target_util.c
+++ b/drivers/target/iscsi/iscsi_target_util.c
@@ -1225,7 +1225,7 @@ int rx_data(
    	return -1;
memset(&msg, 0, sizeof(struct msghdr));
-	iov_iter_kvec(&msg.msg_iter, READ, iov, iov_count, data);
+	iov_iter_kvec(&msg.msg_iter, ITER_DEST, iov, iov_count, data);
while (msg_data_left(&msg)) {
    	rx_loop = sock_recvmsg(conn->sock, &msg, MSG_WAITALL);
@@ -1261,7 +1261,7 @@ int tx_data(
memset(&msg, 0, sizeof(struct msghdr));
-	iov_iter_kvec(&msg.msg_iter, WRITE, iov, iov_count, data);
+	iov_iter_kvec(&msg.msg_iter, ITER_SOURCE, iov, iov_count, data);
while (msg_data_left(&msg)) {
    	int tx_loop = sock_sendmsg(conn->sock, &msg);
diff --git a/drivers/target/target_core_file.c b/drivers/target/target_core_file.c
index 55935040541b..7e81a53dbf3c 100644
--- a/drivers/target/target_core_file.c
+++ b/drivers/target/target_core_file.c
@@ -473,7 +473,7 @@ fd_execute_write_same(struct se_cmd *cmd)
    	len += se_dev->dev_attrib.block_size;
    }
-	iov_iter_bvec(&iter, WRITE, bvec, nolb, len);
+	iov_iter_bvec(&iter, ITER_SOURCE, bvec, nolb, len);
    ret = vfs_iter_write(fd_dev->fd_file, &iter, &pos, 0);
kfree(bvec);
diff --git a/drivers/usb/usbip/usbip_common.c b/drivers/usb/usbip/usbip_common.c
index 053a2bca4c47..f8b326eed54d 100644
--- a/drivers/usb/usbip/usbip_common.c
+++ b/drivers/usb/usbip/usbip_common.c
@@ -309,7 +309,7 @@ int usbip_recv(struct socket *sock, void *buf, int size)
    if (!sock || !buf || !size)
    	return -EINVAL;
-	iov_iter_kvec(&msg.msg_iter, READ, &iov, 1, size);
+	iov_iter_kvec(&msg.msg_iter, ITER_DEST, &iov, 1, size);
usbip_dbg_xmit("enter\n");
diff --git a/drivers/vhost/net.c b/drivers/vhost/net.c
index c7e44d818252..4c538b30fd76 100644
--- a/drivers/vhost/net.c
+++ b/drivers/vhost/net.c
@@ -611,7 +611,7 @@ static size_t init_iov_iter(struct vhost_virtqueue *vq, struct iov_iter *iter,
    /* Skip header. TODO: support TSO. */
    size_t len = iov_length(vq->iov, out);
-	iov_iter_init(iter, WRITE, vq->iov, out, len);
+	iov_iter_init(iter, ITER_SOURCE, vq->iov, out, len);
    iov_iter_advance(iter, hdr_size);
return iov_iter_count(iter);
@@ -1184,14 +1184,14 @@ static void handle_rx(struct vhost_net *net)
    		msg.msg_control = vhost_net_buf_consume(&nvq->rxq);
    	/* On overrun, truncate and discard */
    	if (unlikely(headcount > UIO_MAXIOV)) {
-			iov_iter_init(&msg.msg_iter, READ, vq->iov, 1, 1);
+			iov_iter_init(&msg.msg_iter, ITER_DEST, vq->iov, 1, 1);
    		err = sock->ops->recvmsg(sock, &msg,
    					 1, MSG_DONTWAIT | MSG_TRUNC);
    		pr_debug("Discarded rx packet: len %zd\n", sock_len);
    		continue;
    	}
    	/* We don't need to be notified again. */
-		iov_iter_init(&msg.msg_iter, READ, vq->iov, in, vhost_len);
+		iov_iter_init(&msg.msg_iter, ITER_DEST, vq->iov, in, vhost_len);
    	fixup = msg.msg_iter;
    	if (unlikely((vhost_hlen))) {
    		/* We will supply the header ourselves
diff --git a/drivers/vhost/scsi.c b/drivers/vhost/scsi.c
index 7ebf106d50c1..dca6346d75b3 100644
--- a/drivers/vhost/scsi.c
+++ b/drivers/vhost/scsi.c
@@ -563,7 +563,7 @@ static void vhost_scsi_complete_cmd_work(struct vhost_work *work)
    	memcpy(v_rsp.sense, cmd->tvc_sense_buf,
    	       se_cmd->scsi_sense_length);
-		iov_iter_init(&iov_iter, READ, &cmd->tvc_resp_iov,
+		iov_iter_init(&iov_iter, ITER_DEST, &cmd->tvc_resp_iov,
    		      cmd->tvc_in_iovs, sizeof(v_rsp));
    	ret = copy_to_iter(&v_rsp, sizeof(v_rsp), &iov_iter);
    	if (likely(ret == sizeof(v_rsp))) {
@@ -864,7 +864,7 @@ vhost_scsi_get_desc(struct vhost_scsi *vs, struct vhost_virtqueue *vq,
     * point at the start of the outgoing WRITE payload, if
     * DMA_TO_DEVICE is set.
     */
-	iov_iter_init(&vc->out_iter, WRITE, vq->iov, vc->out, vc->out_size);
+	iov_iter_init(&vc->out_iter, ITER_SOURCE, vq->iov, vc->out, vc->out_size);
    ret = 0;
done:
@@ -1016,7 +1016,7 @@ vhost_scsi_handle_vq(struct vhost_scsi *vs, struct vhost_virtqueue *vq)
    		data_direction = DMA_FROM_DEVICE;
    		exp_data_len = vc.in_size - vc.rsp_size;
-			iov_iter_init(&in_iter, READ, &vq->iov[vc.out], vc.in,
+			iov_iter_init(&in_iter, ITER_DEST, &vq->iov[vc.out], vc.in,
    			      vc.rsp_size + exp_data_len);
    		iov_iter_advance(&in_iter, vc.rsp_size);
    		data_iter = in_iter;
@@ -1146,7 +1146,7 @@ vhost_scsi_send_tmf_resp(struct vhost_scsi *vs, struct vhost_virtqueue *vq,
    memset(&rsp, 0, sizeof(rsp));
    rsp.response = tmf_resp_code;
-	iov_iter_init(&iov_iter, READ, resp_iov, in_iovs, sizeof(rsp));
+	iov_iter_init(&iov_iter, ITER_DEST, resp_iov, in_iovs, sizeof(rsp));
ret = copy_to_iter(&rsp, sizeof(rsp), &iov_iter);
    if (likely(ret == sizeof(rsp)))
@@ -1238,7 +1238,7 @@ vhost_scsi_send_an_resp(struct vhost_scsi *vs,
    memset(&rsp, 0, sizeof(rsp));	/* event_actual = 0 */
    rsp.response = VIRTIO_SCSI_S_OK;
-	iov_iter_init(&iov_iter, READ, &vq->iov[vc->out], vc->in, sizeof(rsp));
+	iov_iter_init(&iov_iter, ITER_DEST, &vq->iov[vc->out], vc->in, sizeof(rsp));
ret = copy_to_iter(&rsp, sizeof(rsp), &iov_iter);
    if (likely(ret == sizeof(rsp)))
diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c
index c234869d6727..43c9770b86e5 100644
--- a/drivers/vhost/vhost.c
+++ b/drivers/vhost/vhost.c
@@ -833,7 +833,7 @@ static int vhost_copy_to_user(struct vhost_virtqueue *vq, void __user *to,
    			     VHOST_ACCESS_WO);
    	if (ret < 0)
    		goto out;
-		iov_iter_init(&t, READ, vq->iotlb_iov, ret, size);
+		iov_iter_init(&t, ITER_DEST, vq->iotlb_iov, ret, size);
    	ret = copy_to_iter(from, size, &t);
    	if (ret == size)
    		ret = 0;
@@ -872,7 +872,7 @@ static int vhost_copy_from_user(struct vhost_virtqueue *vq, void *to,
    		       (unsigned long long) size);
    		goto out;
    	}
-		iov_iter_init(&f, WRITE, vq->iotlb_iov, ret, size);
+		iov_iter_init(&f, ITER_SOURCE, vq->iotlb_iov, ret, size);
    	ret = copy_from_iter(to, size, &f);
    	if (ret == size)
    		ret = 0;
@@ -2136,7 +2136,7 @@ static int get_indirect(struct vhost_virtqueue *vq,
    		vq_err(vq, "Translation failure %d in indirect.\n", ret);
    	return ret;
    }
-	iov_iter_init(&from, WRITE, vq->indirect, ret, len);
+	iov_iter_init(&from, ITER_SOURCE, vq->indirect, ret, len);
    count = len / sizeof desc;
    /* Buffers are chained via a 16 bit next field, so
     * we can have at most 2^16 of these. */
diff --git a/drivers/vhost/vringh.c b/drivers/vhost/vringh.c
index 139c782848c6..33eb941fcf15 100644
--- a/drivers/vhost/vringh.c
+++ b/drivers/vhost/vringh.c
@@ -1161,7 +1161,7 @@ static inline int copy_from_iotlb(const struct vringh *vrh, void *dst,
    	else if (ret < 0)
    		return ret;
-		iov_iter_bvec(&iter, WRITE, iov, ret, translated);
+		iov_iter_bvec(&iter, ITER_SOURCE, iov, ret, translated);
ret = copy_from_iter(dst, translated, &iter);
    	if (ret < 0)
@@ -1194,7 +1194,7 @@ static inline int copy_to_iotlb(const struct vringh *vrh, void *dst,
    	else if (ret < 0)
    		return ret;
-		iov_iter_bvec(&iter, READ, iov, ret, translated);
+		iov_iter_bvec(&iter, ITER_DEST, iov, ret, translated);
ret = copy_to_iter(src, translated, &iter);
    	if (ret < 0)
diff --git a/drivers/vhost/vsock.c b/drivers/vhost/vsock.c
index 10a7d23731fe..a2b374372363 100644
--- a/drivers/vhost/vsock.c
+++ b/drivers/vhost/vsock.c
@@ -165,7 +165,7 @@ vhost_transport_do_send_pkt(struct vhost_vsock *vsock,
    		break;
    	}
-		iov_iter_init(&iov_iter, READ, &vq->iov[out], in, iov_len);
+		iov_iter_init(&iov_iter, ITER_DEST, &vq->iov[out], in, iov_len);
    	payload_len = pkt->len - pkt->off;
/* If the packet is greater than the space available in the
@@ -371,7 +371,7 @@ vhost_vsock_alloc_pkt(struct vhost_virtqueue *vq,
    	return NULL;
len = iov_length(vq->iov, out);
-	iov_iter_init(&iov_iter, WRITE, vq->iov, out, len);
+	iov_iter_init(&iov_iter, ITER_SOURCE, vq->iov, out, len);
nbytes = copy_from_iter(&pkt->hdr, sizeof(pkt->hdr), &iov_iter);
    if (nbytes != sizeof(pkt->hdr)) {
diff --git a/drivers/xen/pvcalls-back.c b/drivers/xen/pvcalls-back.c
index 21b9c850a382..28b2a1fa25ab 100644
--- a/drivers/xen/pvcalls-back.c
+++ b/drivers/xen/pvcalls-back.c
@@ -129,13 +129,13 @@ static bool pvcalls_conn_back_read(void *opaque)
    if (masked_prod < masked_cons) {
    	vec[0].iov_base = data->in + masked_prod;
    	vec[0].iov_len = wanted;
-		iov_iter_kvec(&msg.msg_iter, READ, vec, 1, wanted);
+		iov_iter_kvec(&msg.msg_iter, ITER_DEST, vec, 1, wanted);
    } else {
    	vec[0].iov_base = data->in + masked_prod;
    	vec[0].iov_len = array_size - masked_prod;
    	vec[1].iov_base = data->in;
    	vec[1].iov_len = wanted - vec[0].iov_len;
-		iov_iter_kvec(&msg.msg_iter, READ, vec, 2, wanted);
+		iov_iter_kvec(&msg.msg_iter, ITER_DEST, vec, 2, wanted);
    }
atomic_set(&map->read, 0);
@@ -188,13 +188,13 @@ static bool pvcalls_conn_back_write(struct sock_mapping *map)
    if (pvcalls_mask(prod, array_size) > pvcalls_mask(cons, array_size)) {
    	vec[0].iov_base = data->out + pvcalls_mask(cons, array_size);
    	vec[0].iov_len = size;
-		iov_iter_kvec(&msg.msg_iter, WRITE, vec, 1, size);
+		iov_iter_kvec(&msg.msg_iter, ITER_SOURCE, vec, 1, size);
    } else {
    	vec[0].iov_base = data->out + pvcalls_mask(cons, array_size);
    	vec[0].iov_len = array_size - pvcalls_mask(cons, array_size);
    	vec[1].iov_base = data->out;
    	vec[1].iov_len = size - vec[0].iov_len;
-		iov_iter_kvec(&msg.msg_iter, WRITE, vec, 2, size);
+		iov_iter_kvec(&msg.msg_iter, ITER_SOURCE, vec, 2, size);
    }
atomic_set(&map->write, 0);
diff --git a/fs/9p/vfs_addr.c b/fs/9p/vfs_addr.c
index 47b9a1122f34..a19891015f19 100644
--- a/fs/9p/vfs_addr.c
+++ b/fs/9p/vfs_addr.c
@@ -40,7 +40,7 @@ static void v9fs_issue_read(struct netfs_io_subrequest *subreq)
    size_t len = subreq->len   - subreq->transferred;
    int total, err;
-	iov_iter_xarray(&to, READ, &rreq->mapping->i_pages, pos, len);
+	iov_iter_xarray(&to, ITER_DEST, &rreq->mapping->i_pages, pos, len);
total = p9_client_read(fid, pos, &to, &err);
@@ -172,7 +172,7 @@ static int v9fs_vfs_write_folio_locked(struct folio *folio)
len = min_t(loff_t, i_size - start, len);
-	iov_iter_xarray(&from, WRITE, &folio_mapping(folio)->i_pages, start, len);
+	iov_iter_xarray(&from, ITER_SOURCE, &folio_mapping(folio)->i_pages, start, len);
/* We should have writeback_fid always set */
    BUG_ON(!v9inode->writeback_fid);
diff --git a/fs/9p/vfs_dir.c b/fs/9p/vfs_dir.c
index 000fbaae9b18..3bb95adc9619 100644
--- a/fs/9p/vfs_dir.c
+++ b/fs/9p/vfs_dir.c
@@ -109,7 +109,7 @@ static int v9fs_dir_readdir(struct file *file, struct dir_context *ctx)
    		struct iov_iter to;
    		int n;
-			iov_iter_kvec(&to, READ, &kvec, 1, buflen);
+			iov_iter_kvec(&to, ITER_DEST, &kvec, 1, buflen);
    		n = p9_client_read(file->private_data, ctx->pos, &to,
    				   &err);
    		if (err)
diff --git a/fs/9p/xattr.c b/fs/9p/xattr.c
index 1f9298a4bd42..2807bb63f780 100644
--- a/fs/9p/xattr.c
+++ b/fs/9p/xattr.c
@@ -24,7 +24,7 @@ ssize_t v9fs_fid_xattr_get(struct p9_fid *fid, const char *name,
    struct iov_iter to;
    int err;
-	iov_iter_kvec(&to, READ, &kvec, 1, buffer_size);
+	iov_iter_kvec(&to, ITER_DEST, &kvec, 1, buffer_size);
attr_fid = p9_client_xattrwalk(fid, name, &attr_size);
    if (IS_ERR(attr_fid)) {
@@ -109,7 +109,7 @@ int v9fs_fid_xattr_set(struct p9_fid *fid, const char *name,
    struct iov_iter from;
    int retval, err;
-	iov_iter_kvec(&from, WRITE, &kvec, 1, value_len);
+	iov_iter_kvec(&from, ITER_SOURCE, &kvec, 1, value_len);
p9_debug(P9_DEBUG_VFS, "name = %s value_len = %zu flags = %d\n",
    	 name, value_len, flags);
diff --git a/fs/afs/cmservice.c b/fs/afs/cmservice.c
index 0a090d614e76..7dcd59693a0c 100644
--- a/fs/afs/cmservice.c
+++ b/fs/afs/cmservice.c
@@ -298,7 +298,7 @@ static int afs_deliver_cb_callback(struct afs_call *call)
    	if (call->count2 != call->count && call->count2 != 0)
    		return afs_protocol_error(call, afs_eproto_cb_count);
    	call->iter = &call->def_iter;
-		iov_iter_discard(&call->def_iter, READ, call->count2 * 3 * 4);
+		iov_iter_discard(&call->def_iter, ITER_DEST, call->count2 * 3 * 4);
    	call->unmarshall++;
fallthrough;
diff --git a/fs/afs/dir.c b/fs/afs/dir.c
index 230c2d19116d..104df2964225 100644
--- a/fs/afs/dir.c
+++ b/fs/afs/dir.c
@@ -305,7 +305,7 @@ static struct afs_read *afs_read_dir(struct afs_vnode *dvnode, struct key *key)
    req->actual_len = i_size; /* May change */
    req->len = nr_pages * PAGE_SIZE; /* We can ask for more than there is */
    req->data_version = dvnode->status.data_version; /* May change */
-	iov_iter_xarray(&req->def_iter, READ, &dvnode->netfs.inode.i_mapping->i_pages,
+	iov_iter_xarray(&req->def_iter, ITER_DEST, &dvnode->netfs.inode.i_mapping->i_pages,
    		0, i_size);
    req->iter = &req->def_iter;
diff --git a/fs/afs/file.c b/fs/afs/file.c
index d1cfb235c4b9..2eeab57df133 100644
--- a/fs/afs/file.c
+++ b/fs/afs/file.c
@@ -324,7 +324,7 @@ static void afs_issue_read(struct netfs_io_subrequest *subreq)
    fsreq->vnode	= vnode;
    fsreq->iter	= &fsreq->def_iter;
-	iov_iter_xarray(&fsreq->def_iter, READ,
+	iov_iter_xarray(&fsreq->def_iter, ITER_DEST,
    		&fsreq->vnode->netfs.inode.i_mapping->i_pages,
    		fsreq->pos, fsreq->len);
@@ -346,7 +346,7 @@ static int afs_symlink_read_folio(struct file *file, struct folio *folio)
    fsreq->len	= folio_size(folio);
    fsreq->vnode	= vnode;
    fsreq->iter	= &fsreq->def_iter;
-	iov_iter_xarray(&fsreq->def_iter, READ, &folio->mapping->i_pages,
+	iov_iter_xarray(&fsreq->def_iter, ITER_DEST, &folio->mapping->i_pages,
    		fsreq->pos, fsreq->len);
ret = afs_fetch_data(fsreq->vnode, fsreq);
diff --git a/fs/afs/internal.h b/fs/afs/internal.h
index 723d162078a3..9ba7b68375c9 100644
--- a/fs/afs/internal.h
+++ b/fs/afs/internal.h
@@ -1301,7 +1301,7 @@ static inline void afs_extract_begin(struct afs_call *call, void *buf, size_t si
    call->iov_len = size;
    call->kvec[0].iov_base = buf;
    call->kvec[0].iov_len = size;
-	iov_iter_kvec(&call->def_iter, READ, call->kvec, 1, size);
+	iov_iter_kvec(&call->def_iter, ITER_DEST, call->kvec, 1, size);
 }
static inline void afs_extract_to_tmp(struct afs_call *call)
@@ -1319,7 +1319,7 @@ static inline void afs_extract_to_tmp64(struct afs_call *call)
 static inline void afs_extract_discard(struct afs_call *call, size_t size)
 {
    call->iov_len = size;
-	iov_iter_discard(&call->def_iter, READ, size);
+	iov_iter_discard(&call->def_iter, ITER_DEST, size);
 }
static inline void afs_extract_to_buf(struct afs_call *call, size_t size)
diff --git a/fs/afs/rxrpc.c b/fs/afs/rxrpc.c
index eccc3cd0cb70..c62939e5ea1f 100644
--- a/fs/afs/rxrpc.c
+++ b/fs/afs/rxrpc.c
@@ -359,7 +359,7 @@ void afs_make_call(struct afs_addr_cursor *ac, struct afs_call *call, gfp_t gfp)
msg.msg_name		= NULL;
    msg.msg_namelen		= 0;
-	iov_iter_kvec(&msg.msg_iter, WRITE, iov, 1, call->request_size);
+	iov_iter_kvec(&msg.msg_iter, ITER_SOURCE, iov, 1, call->request_size);
    msg.msg_control		= NULL;
    msg.msg_controllen	= 0;
    msg.msg_flags		= MSG_WAITALL | (call->write_iter ? MSG_MORE : 0);
@@ -400,7 +400,7 @@ void afs_make_call(struct afs_addr_cursor *ac, struct afs_call *call, gfp_t gfp)
    				RX_USER_ABORT, ret, "KSD");
    } else {
    	len = 0;
-		iov_iter_kvec(&msg.msg_iter, READ, NULL, 0, 0);
+		iov_iter_kvec(&msg.msg_iter, ITER_DEST, NULL, 0, 0);
    	rxrpc_kernel_recv_data(call->net->socket, rxcall,
    			       &msg.msg_iter, &len, false,
    			       &call->abort_code, &call->service_id);
@@ -485,7 +485,7 @@ static void afs_deliver_to_call(struct afs_call *call)
           ) {
    	if (state == AFS_CALL_SV_AWAIT_ACK) {
    		len = 0;
-			iov_iter_kvec(&call->def_iter, READ, NULL, 0, 0);
+			iov_iter_kvec(&call->def_iter, ITER_DEST, NULL, 0, 0);
    		ret = rxrpc_kernel_recv_data(call->net->socket,
    					     call->rxcall, &call->def_iter,
    					     &len, false, &remote_abort,
@@ -822,7 +822,7 @@ void afs_send_empty_reply(struct afs_call *call)
msg.msg_name		= NULL;
    msg.msg_namelen		= 0;
-	iov_iter_kvec(&msg.msg_iter, WRITE, NULL, 0, 0);
+	iov_iter_kvec(&msg.msg_iter, ITER_SOURCE, NULL, 0, 0);
    msg.msg_control		= NULL;
    msg.msg_controllen	= 0;
    msg.msg_flags		= 0;
@@ -862,7 +862,7 @@ void afs_send_simple_reply(struct afs_call *call, const void *buf, size_t len)
    iov[0].iov_len		= len;
    msg.msg_name		= NULL;
    msg.msg_namelen		= 0;
-	iov_iter_kvec(&msg.msg_iter, WRITE, iov, 1, len);
+	iov_iter_kvec(&msg.msg_iter, ITER_SOURCE, iov, 1, len);
    msg.msg_control		= NULL;
    msg.msg_controllen	= 0;
    msg.msg_flags		= 0;
diff --git a/fs/afs/write.c b/fs/afs/write.c
index 9ebdd36eaf2f..08fd456dde67 100644
--- a/fs/afs/write.c
+++ b/fs/afs/write.c
@@ -609,7 +609,7 @@ static ssize_t afs_write_back_from_locked_folio(struct address_space *mapping,
    	 */
    	afs_write_to_cache(vnode, start, len, i_size, caching);
-		iov_iter_xarray(&iter, WRITE, &mapping->i_pages, start, len);
+		iov_iter_xarray(&iter, ITER_SOURCE, &mapping->i_pages, start, len);
    	ret = afs_store_data(vnode, &iter, start, false);
    } else {
    	_debug("write discard %x @%llx [%llx]", len, start, i_size);
@@ -1000,7 +1000,7 @@ int afs_launder_folio(struct folio *folio)
    	bv[0].bv_page = &folio->page;
    	bv[0].bv_offset = f;
    	bv[0].bv_len = t - f;
-		iov_iter_bvec(&iter, WRITE, bv, 1, bv[0].bv_len);
+		iov_iter_bvec(&iter, ITER_SOURCE, bv, 1, bv[0].bv_len);
trace_afs_folio_dirty(vnode, tracepoint_string("launder"), folio);
    	ret = afs_store_data(vnode, &iter, folio_pos(folio) + f, true);
diff --git a/fs/aio.c b/fs/aio.c
index 5b2ff20ad322..562916d85cba 100644
--- a/fs/aio.c
+++ b/fs/aio.c
@@ -1552,7 +1552,7 @@ static int aio_read(struct kiocb *req, const struct iocb *iocb,
    if (unlikely(!file->f_op->read_iter))
    	return -EINVAL;
-	ret = aio_setup_rw(READ, iocb, &iovec, vectored, compat, &iter);
+	ret = aio_setup_rw(ITER_DEST, iocb, &iovec, vectored, compat, &iter);
    if (ret < 0)
    	return ret;
    ret = rw_verify_area(READ, file, &req->ki_pos, iov_iter_count(&iter));
@@ -1580,7 +1580,7 @@ static int aio_write(struct kiocb *req, const struct iocb *iocb,
    if (unlikely(!file->f_op->write_iter))
    	return -EINVAL;
-	ret = aio_setup_rw(WRITE, iocb, &iovec, vectored, compat, &iter);
+	ret = aio_setup_rw(ITER_SOURCE, iocb, &iovec, vectored, compat, &iter);
    if (ret < 0)
    	return ret;
    ret = rw_verify_area(WRITE, file, &req->ki_pos, iov_iter_count(&iter));
diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index fd1902573cde..c05f16a35bca 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -5283,7 +5283,7 @@ static int btrfs_ioctl_encoded_read(struct file *file, void __user *argp,
    	goto out_acct;
    }
-	ret = import_iovec(READ, args.iov, args.iovcnt, ARRAY_SIZE(iovstack),
+	ret = import_iovec(ITER_DEST, args.iov, args.iovcnt, ARRAY_SIZE(iovstack),
    		   &iov, &iter);
    if (ret < 0)
    	goto out_acct;
@@ -5382,7 +5382,7 @@ static int btrfs_ioctl_encoded_write(struct file *file, void __user *argp, bool
    if (args.len > args.unencoded_len - args.unencoded_offset)
    	goto out_acct;
-	ret = import_iovec(WRITE, args.iov, args.iovcnt, ARRAY_SIZE(iovstack),
+	ret = import_iovec(ITER_SOURCE, args.iov, args.iovcnt, ARRAY_SIZE(iovstack),
    		   &iov, &iter);
    if (ret < 0)
    	goto out_acct;
diff --git a/fs/ceph/addr.c b/fs/ceph/addr.c
index dcf701b05cc1..61f47debec5a 100644
--- a/fs/ceph/addr.c
+++ b/fs/ceph/addr.c
@@ -288,7 +288,7 @@ static bool ceph_netfs_issue_op_inline(struct netfs_io_subrequest *subreq)
    }
len = min_t(size_t, iinfo->inline_len - subreq->start, subreq->len);
-	iov_iter_xarray(&iter, READ, &rreq->mapping->i_pages, subreq->start, len);
+	iov_iter_xarray(&iter, ITER_DEST, &rreq->mapping->i_pages, subreq->start, len);
    err = copy_to_iter(iinfo->inline_data + subreq->start, len, &iter);
    if (err == 0)
    	err = -EFAULT;
@@ -327,7 +327,7 @@ static void ceph_netfs_issue_read(struct netfs_io_subrequest *subreq)
    }
dout("%s: pos=%llu orig_len=%zu len=%llu\n", __func__, subreq->start, subreq->len, len);
-	iov_iter_xarray(&iter, READ, &rreq->mapping->i_pages, subreq->start, len);
+	iov_iter_xarray(&iter, ITER_DEST, &rreq->mapping->i_pages, subreq->start, len);
    err = iov_iter_get_pages_alloc2(&iter, &pages, len, &page_off);
    if (err < 0) {
    	dout("%s: iov_ter_get_pages_alloc returned %d\n", __func__, err);
diff --git a/fs/ceph/file.c b/fs/ceph/file.c
index 04fd34557de8..6f9580defb2b 100644
--- a/fs/ceph/file.c
+++ b/fs/ceph/file.c
@@ -1161,7 +1161,7 @@ static void ceph_aio_complete_req(struct ceph_osd_request *req)
    			aio_req->total_len = rc + zlen;
    		}
-			iov_iter_bvec(&i, READ, osd_data->bvec_pos.bvecs,
+			iov_iter_bvec(&i, ITER_DEST, osd_data->bvec_pos.bvecs,
    			      osd_data->num_bvecs, len);
    		iov_iter_advance(&i, rc);
    		iov_iter_zero(zlen, &i);
@@ -1400,7 +1400,7 @@ ceph_direct_read_write(struct kiocb *iocb, struct iov_iter *iter,
    			int zlen = min_t(size_t, len - ret,
    					 size - pos - ret);
-				iov_iter_bvec(&i, READ, bvecs, num_pages, len);
+				iov_iter_bvec(&i, ITER_DEST, bvecs, num_pages, len);
    			iov_iter_advance(&i, ret);
    			iov_iter_zero(zlen, &i);
    			ret += zlen;
diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c
index eab36e4ea130..384c7c0e1088 100644
--- a/fs/cifs/connect.c
+++ b/fs/cifs/connect.c
@@ -761,7 +761,7 @@ cifs_read_from_socket(struct TCP_Server_Info *server, char *buf,
 {
    struct msghdr smb_msg = {};
    struct kvec iov = {.iov_base = buf, .iov_len = to_read};
-	iov_iter_kvec(&smb_msg.msg_iter, READ, &iov, 1, to_read);
+	iov_iter_kvec(&smb_msg.msg_iter, ITER_DEST, &iov, 1, to_read);
return cifs_readv_from_socket(server, &smb_msg);
 }
@@ -776,7 +776,7 @@ cifs_discard_from_socket(struct TCP_Server_Info *server, size_t to_read)
     *  and cifs_readv_from_socket sets msg_control and msg_controllen
     *  so little to initialize in struct msghdr
     */
-	iov_iter_discard(&smb_msg.msg_iter, READ, to_read);
+	iov_iter_discard(&smb_msg.msg_iter, ITER_DEST, to_read);
return cifs_readv_from_socket(server, &smb_msg);
 }
@@ -788,7 +788,7 @@ cifs_read_page_from_socket(struct TCP_Server_Info *server, struct page *page,
    struct msghdr smb_msg = {};
    struct bio_vec bv = {
    	.bv_page = page, .bv_len = to_read, .bv_offset = page_offset};
-	iov_iter_bvec(&smb_msg.msg_iter, READ, &bv, 1, to_read);
+	iov_iter_bvec(&smb_msg.msg_iter, ITER_DEST, &bv, 1, to_read);
    return cifs_readv_from_socket(server, &smb_msg);
 }
diff --git a/fs/cifs/file.c b/fs/cifs/file.c
index cd9698209930..209dfc06fd6d 100644
--- a/fs/cifs/file.c
+++ b/fs/cifs/file.c
@@ -3532,7 +3532,7 @@ static ssize_t __cifs_writev(
    	ctx->iter = *from;
    	ctx->len = len;
    } else {
-		rc = setup_aio_ctx_iter(ctx, from, WRITE);
+		rc = setup_aio_ctx_iter(ctx, from, ITER_SOURCE);
    	if (rc) {
    		kref_put(&ctx->refcount, cifs_aio_ctx_release);
    		return rc;
@@ -4276,7 +4276,7 @@ static ssize_t __cifs_readv(
    	ctx->iter = *to;
    	ctx->len = len;
    } else {
-		rc = setup_aio_ctx_iter(ctx, to, READ);
+		rc = setup_aio_ctx_iter(ctx, to, ITER_DEST);
    	if (rc) {
    		kref_put(&ctx->refcount, cifs_aio_ctx_release);
    		return rc;
diff --git a/fs/cifs/fscache.c b/fs/cifs/fscache.c
index a1751b956318..f6f3a6b75601 100644
--- a/fs/cifs/fscache.c
+++ b/fs/cifs/fscache.c
@@ -150,7 +150,7 @@ static int fscache_fallback_read_page(struct inode *inode, struct page *page)
    bvec[0].bv_page		= page;
    bvec[0].bv_offset	= 0;
    bvec[0].bv_len		= PAGE_SIZE;
-	iov_iter_bvec(&iter, READ, bvec, ARRAY_SIZE(bvec), PAGE_SIZE);
+	iov_iter_bvec(&iter, ITER_DEST, bvec, ARRAY_SIZE(bvec), PAGE_SIZE);
ret = fscache_begin_read_operation(&cres, cookie);
    if (ret < 0)
@@ -180,7 +180,7 @@ static int fscache_fallback_write_page(struct inode *inode, struct page *page,
    bvec[0].bv_page		= page;
    bvec[0].bv_offset	= 0;
    bvec[0].bv_len		= PAGE_SIZE;
-	iov_iter_bvec(&iter, WRITE, bvec, ARRAY_SIZE(bvec), PAGE_SIZE);
+	iov_iter_bvec(&iter, ITER_SOURCE, bvec, ARRAY_SIZE(bvec), PAGE_SIZE);
ret = fscache_begin_write_operation(&cres, cookie);
    if (ret < 0)
diff --git a/fs/cifs/smb2ops.c b/fs/cifs/smb2ops.c
index 1ff5b6b0e07a..78c2d618eb51 100644
--- a/fs/cifs/smb2ops.c
+++ b/fs/cifs/smb2ops.c
@@ -4737,13 +4737,13 @@ handle_read_data(struct TCP_Server_Info *server, struct mid_q_entry *mid,
    		return 0;
    	}
-		iov_iter_bvec(&iter, WRITE, bvec, npages, data_len);
+		iov_iter_bvec(&iter, ITER_SOURCE, bvec, npages, data_len);
    } else if (buf_len >= data_offset + data_len) {
    	/* read response payload is in buf */
    	WARN_ONCE(npages > 0, "read data can be either in buf or in pages");
    	iov.iov_base = buf + data_offset;
    	iov.iov_len = data_len;
-		iov_iter_kvec(&iter, WRITE, &iov, 1, data_len);
+		iov_iter_kvec(&iter, ITER_SOURCE, &iov, 1, data_len);
    } else {
    	/* read response payload cannot be in both buf and pages */
    	WARN_ONCE(1, "buf can not contain only a part of read data");
diff --git a/fs/cifs/transport.c b/fs/cifs/transport.c
index 575fa8f58342..3851d0aaa288 100644
--- a/fs/cifs/transport.c
+++ b/fs/cifs/transport.c
@@ -347,7 +347,7 @@ __smb_send_rqst(struct TCP_Server_Info *server, int num_rqst,
    		.iov_base = &rfc1002_marker,
    		.iov_len  = 4
    	};
-		iov_iter_kvec(&smb_msg.msg_iter, WRITE, &hiov, 1, 4);
+		iov_iter_kvec(&smb_msg.msg_iter, ITER_SOURCE, &hiov, 1, 4);
    	rc = smb_send_kvec(server, &smb_msg, &sent);
    	if (rc < 0)
    		goto unmask;
@@ -368,7 +368,7 @@ __smb_send_rqst(struct TCP_Server_Info *server, int num_rqst,
    		size += iov[i].iov_len;
    	}
-		iov_iter_kvec(&smb_msg.msg_iter, WRITE, iov, n_vec, size);
+		iov_iter_kvec(&smb_msg.msg_iter, ITER_SOURCE, iov, n_vec, size);
rc = smb_send_kvec(server, &smb_msg, &sent);
    	if (rc < 0)
@@ -384,7 +384,7 @@ __smb_send_rqst(struct TCP_Server_Info *server, int num_rqst,
    		rqst_page_get_length(&rqst[j], i, &bvec.bv_len,
    				     &bvec.bv_offset);
-			iov_iter_bvec(&smb_msg.msg_iter, WRITE,
+			iov_iter_bvec(&smb_msg.msg_iter, ITER_SOURCE,
    			      &bvec, 1, bvec.bv_len);
    		rc = smb_send_kvec(server, &smb_msg, &sent);
    		if (rc < 0)
diff --git a/fs/coredump.c b/fs/coredump.c
index 7bad7785e8e6..095ed821c8ac 100644
--- a/fs/coredump.c
+++ b/fs/coredump.c
@@ -853,7 +853,7 @@ static int dump_emit_page(struct coredump_params *cprm, struct page *page)
    if (dump_interrupted())
    	return 0;
    pos = file->f_pos;
-	iov_iter_bvec(&iter, WRITE, &bvec, 1, PAGE_SIZE);
+	iov_iter_bvec(&iter, ITER_SOURCE, &bvec, 1, PAGE_SIZE);
    n = __kernel_write_iter(cprm->file, &iter, &pos);
    if (n != PAGE_SIZE)
    	return 0;
diff --git a/fs/erofs/fscache.c b/fs/erofs/fscache.c
index 6a792a513d6b..b04f93bc062a 100644
--- a/fs/erofs/fscache.c
+++ b/fs/erofs/fscache.c
@@ -194,7 +194,7 @@ static int erofs_fscache_read_folios_async(struct fscache_cookie *cookie,
atomic_inc(&rreq->nr_outstanding);
-		iov_iter_xarray(&iter, READ, &rreq->mapping->i_pages,
+		iov_iter_xarray(&iter, ITER_DEST, &rreq->mapping->i_pages,
    			start + done, subreq->len);
ret = fscache_read(cres, subreq->start, &iter,
@@ -290,7 +290,7 @@ static int erofs_fscache_data_read(struct address_space *mapping,
    	if (IS_ERR(src))
    		return PTR_ERR(src);
-		iov_iter_xarray(&iter, READ, &mapping->i_pages, pos, PAGE_SIZE);
+		iov_iter_xarray(&iter, ITER_DEST, &mapping->i_pages, pos, PAGE_SIZE);
    	if (copy_to_iter(src + offset, size, &iter) != size) {
    		erofs_put_metabuf(&buf);
    		return -EFAULT;
@@ -302,7 +302,7 @@ static int erofs_fscache_data_read(struct address_space *mapping,
if (!(map.m_flags & EROFS_MAP_MAPPED)) {
    	count = len;
-		iov_iter_xarray(&iter, READ, &mapping->i_pages, pos, count);
+		iov_iter_xarray(&iter, ITER_DEST, &mapping->i_pages, pos, count);
    	iov_iter_zero(count, &iter);
    	return count;
    }
diff --git a/fs/fscache/io.c b/fs/fscache/io.c
index 3af3b08a9bb3..0d2b8dec8f82 100644
--- a/fs/fscache/io.c
+++ b/fs/fscache/io.c
@@ -286,7 +286,7 @@ void __fscache_write_to_cache(struct fscache_cookie *cookie,
     * taken into account.
     */
-	iov_iter_xarray(&iter, WRITE, &mapping->i_pages, start, len);
+	iov_iter_xarray(&iter, ITER_SOURCE, &mapping->i_pages, start, len);
    fscache_write(cres, start, &iter, fscache_wreq_done, wreq);
    return;
diff --git a/fs/fuse/ioctl.c b/fs/fuse/ioctl.c
index 61d8afcb10a3..fcce94ace2c2 100644
--- a/fs/fuse/ioctl.c
+++ b/fs/fuse/ioctl.c
@@ -255,7 +255,7 @@ long fuse_do_ioctl(struct file *file, unsigned int cmd, unsigned long arg,
    	ap.args.in_pages = true;
err = -EFAULT;
-		iov_iter_init(&ii, WRITE, in_iov, in_iovs, in_size);
+		iov_iter_init(&ii, ITER_SOURCE, in_iov, in_iovs, in_size);
    	for (i = 0; iov_iter_count(&ii) && !WARN_ON(i >= ap.num_pages); i++) {
    		c = copy_page_from_iter(ap.pages[i], 0, PAGE_SIZE, &ii);
    		if (c != PAGE_SIZE && iov_iter_count(&ii))
@@ -324,7 +324,7 @@ long fuse_do_ioctl(struct file *file, unsigned int cmd, unsigned long arg,
    	goto out;
err = -EFAULT;
-	iov_iter_init(&ii, READ, out_iov, out_iovs, transferred);
+	iov_iter_init(&ii, ITER_DEST, out_iov, out_iovs, transferred);
    for (i = 0; iov_iter_count(&ii) && !WARN_ON(i >= ap.num_pages); i++) {
    	c = copy_page_to_iter(ap.pages[i], 0, PAGE_SIZE, &ii);
    	if (c != PAGE_SIZE && iov_iter_count(&ii))
diff --git a/fs/netfs/io.c b/fs/netfs/io.c
index e374767d1b68..7f753380e047 100644
--- a/fs/netfs/io.c
+++ b/fs/netfs/io.c
@@ -23,7 +23,7 @@ static void netfs_clear_unread(struct netfs_io_subrequest *subreq)
 {
    struct iov_iter iter;
-	iov_iter_xarray(&iter, READ, &subreq->rreq->mapping->i_pages,
+	iov_iter_xarray(&iter, ITER_DEST, &subreq->rreq->mapping->i_pages,
    		subreq->start + subreq->transferred,
    		subreq->len   - subreq->transferred);
    iov_iter_zero(iov_iter_count(&iter), &iter);
@@ -49,7 +49,7 @@ static void netfs_read_from_cache(struct netfs_io_request *rreq,
    struct iov_iter iter;
netfs_stat(&netfs_n_rh_read);
-	iov_iter_xarray(&iter, READ, &rreq->mapping->i_pages,
+	iov_iter_xarray(&iter, ITER_DEST, &rreq->mapping->i_pages,
    		subreq->start + subreq->transferred,
    		subreq->len   - subreq->transferred);
@@ -208,7 +208,7 @@ static void netfs_rreq_do_write_to_cache(struct netfs_io_request *rreq)
    		continue;
    	}
-		iov_iter_xarray(&iter, WRITE, &rreq->mapping->i_pages,
+		iov_iter_xarray(&iter, ITER_SOURCE, &rreq->mapping->i_pages,
    			subreq->start, subreq->len);
atomic_inc(&rreq->nr_copy_ops);
diff --git a/fs/nfs/fscache.c b/fs/nfs/fscache.c
index e861d7bae305..e731c00a9fcb 100644
--- a/fs/nfs/fscache.c
+++ b/fs/nfs/fscache.c
@@ -252,7 +252,7 @@ static int fscache_fallback_read_page(struct inode *inode, struct page *page)
    bvec[0].bv_page		= page;
    bvec[0].bv_offset	= 0;
    bvec[0].bv_len		= PAGE_SIZE;
-	iov_iter_bvec(&iter, READ, bvec, ARRAY_SIZE(bvec), PAGE_SIZE);
+	iov_iter_bvec(&iter, ITER_DEST, bvec, ARRAY_SIZE(bvec), PAGE_SIZE);
ret = fscache_begin_read_operation(&cres, cookie);
    if (ret < 0)
@@ -282,7 +282,7 @@ static int fscache_fallback_write_page(struct inode *inode, struct page *page,
    bvec[0].bv_page		= page;
    bvec[0].bv_offset	= 0;
    bvec[0].bv_len		= PAGE_SIZE;
-	iov_iter_bvec(&iter, WRITE, bvec, ARRAY_SIZE(bvec), PAGE_SIZE);
+	iov_iter_bvec(&iter, ITER_SOURCE, bvec, ARRAY_SIZE(bvec), PAGE_SIZE);
ret = fscache_begin_write_operation(&cres, cookie);
    if (ret < 0)
diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c
index 2934ab1d9862..0d49c6bb22eb 100644
--- a/fs/nfsd/vfs.c
+++ b/fs/nfsd/vfs.c
@@ -943,7 +943,7 @@ __be32 nfsd_readv(struct svc_rqst *rqstp, struct svc_fh *fhp,
    ssize_t host_err;
trace_nfsd_read_vector(rqstp, fhp, offset, *count);
-	iov_iter_kvec(&iter, READ, vec, vlen, *count);
+	iov_iter_kvec(&iter, ITER_DEST, vec, vlen, *count);
    host_err = vfs_iter_read(file, &iter, &ppos, 0);
    return nfsd_finish_read(rqstp, fhp, file, offset, count, eof, host_err);
 }
@@ -1033,7 +1033,7 @@ nfsd_vfs_write(struct svc_rqst *rqstp, struct svc_fh *fhp, struct nfsd_file *nf,
    if (stable && !use_wgather)
    	flags |= RWF_SYNC;
-	iov_iter_kvec(&iter, WRITE, vec, vlen, *cnt);
+	iov_iter_kvec(&iter, ITER_SOURCE, vec, vlen, *cnt);
    since = READ_ONCE(file->f_wb_err);
    if (verf)
    	nfsd_copy_write_verifier(verf, nn);
diff --git a/fs/ocfs2/cluster/tcp.c b/fs/ocfs2/cluster/tcp.c
index f660c0dbdb63..785cabd71d67 100644
--- a/fs/ocfs2/cluster/tcp.c
+++ b/fs/ocfs2/cluster/tcp.c
@@ -900,7 +900,7 @@ static int o2net_recv_tcp_msg(struct socket *sock, void *data, size_t len)
 {
    struct kvec vec = { .iov_len = len, .iov_base = data, };
    struct msghdr msg = { .msg_flags = MSG_DONTWAIT, };
-	iov_iter_kvec(&msg.msg_iter, READ, &vec, 1, len);
+	iov_iter_kvec(&msg.msg_iter, ITER_DEST, &vec, 1, len);
    return sock_recvmsg(sock, &msg, MSG_DONTWAIT);
 }
diff --git a/fs/orangefs/inode.c b/fs/orangefs/inode.c
index 7a8c0c6e698d..b3bbb5a5787a 100644
--- a/fs/orangefs/inode.c
+++ b/fs/orangefs/inode.c
@@ -53,7 +53,7 @@ static int orangefs_writepage_locked(struct page *page,
    bv.bv_len = wlen;
    bv.bv_offset = off % PAGE_SIZE;
    WARN_ON(wlen == 0);
-	iov_iter_bvec(&iter, WRITE, &bv, 1, wlen);
+	iov_iter_bvec(&iter, ITER_SOURCE, &bv, 1, wlen);
ret = wait_for_direct_io(ORANGEFS_IO_WRITE, inode, &off, &iter, wlen,
        len, wr, NULL, NULL);
@@ -112,7 +112,7 @@ static int orangefs_writepages_work(struct orangefs_writepages *ow,
    	else
    		ow->bv[i].bv_offset = 0;
    }
-	iov_iter_bvec(&iter, WRITE, ow->bv, ow->npages, ow->len);
+	iov_iter_bvec(&iter, ITER_SOURCE, ow->bv, ow->npages, ow->len);
WARN_ON(ow->off >= len);
    if (ow->off + ow->len > len)
@@ -270,7 +270,7 @@ static void orangefs_readahead(struct readahead_control *rac)
    offset = readahead_pos(rac);
    i_pages = &rac->mapping->i_pages;
-	iov_iter_xarray(&iter, READ, i_pages, offset, readahead_length(rac));
+	iov_iter_xarray(&iter, ITER_DEST, i_pages, offset, readahead_length(rac));
/* read in the pages. */
    if ((ret = wait_for_direct_io(ORANGEFS_IO_READ, inode,
@@ -303,7 +303,7 @@ static int orangefs_read_folio(struct file *file, struct folio *folio)
    bv.bv_page = &folio->page;
    bv.bv_len = folio_size(folio);
    bv.bv_offset = 0;
-	iov_iter_bvec(&iter, READ, &bv, 1, folio_size(folio));
+	iov_iter_bvec(&iter, ITER_DEST, &bv, 1, folio_size(folio));
ret = wait_for_direct_io(ORANGEFS_IO_READ, inode, &off, &iter,
    		folio_size(folio), inode->i_size, NULL, NULL, file);
diff --git a/fs/proc/vmcore.c b/fs/proc/vmcore.c
index f2aa86c421f2..5aa527ca6dbe 100644
--- a/fs/proc/vmcore.c
+++ b/fs/proc/vmcore.c
@@ -199,7 +199,7 @@ ssize_t __weak elfcorehdr_read(char *buf, size_t count, u64 *ppos)
    struct kvec kvec = { .iov_base = buf, .iov_len = count };
    struct iov_iter iter;
-	iov_iter_kvec(&iter, READ, &kvec, 1, count);
+	iov_iter_kvec(&iter, ITER_DEST, &kvec, 1, count);
return read_from_oldmem(&iter, count, ppos, false);
 }
@@ -212,7 +212,7 @@ ssize_t __weak elfcorehdr_read_notes(char *buf, size_t count, u64 *ppos)
    struct kvec kvec = { .iov_base = buf, .iov_len = count };
    struct iov_iter iter;
-	iov_iter_kvec(&iter, READ, &kvec, 1, count);
+	iov_iter_kvec(&iter, ITER_DEST, &kvec, 1, count);
return read_from_oldmem(&iter, count, ppos,
    		cc_platform_has(CC_ATTR_MEM_ENCRYPT));
@@ -437,7 +437,7 @@ static vm_fault_t mmap_vmcore_fault(struct vm_fault *vmf)
    	offset = (loff_t) index << PAGE_SHIFT;
    	kvec.iov_base = page_address(page);
    	kvec.iov_len = PAGE_SIZE;
-		iov_iter_kvec(&iter, READ, &kvec, 1, PAGE_SIZE);
+		iov_iter_kvec(&iter, ITER_DEST, &kvec, 1, PAGE_SIZE);
rc = __read_vmcore(&iter, &offset);
    	if (rc < 0) {
diff --git a/fs/read_write.c b/fs/read_write.c
index 24b9668d6377..7a2ff6157eda 100644
--- a/fs/read_write.c
+++ b/fs/read_write.c
@@ -384,7 +384,7 @@ static ssize_t new_sync_read(struct file *filp, char __user *buf, size_t len, lo
init_sync_kiocb(&kiocb, filp);
    kiocb.ki_pos = (ppos ? *ppos : 0);
-	iov_iter_ubuf(&iter, READ, buf, len);
+	iov_iter_ubuf(&iter, ITER_DEST, buf, len);
ret = call_read_iter(filp, &kiocb, &iter);
    BUG_ON(ret == -EIOCBQUEUED);
@@ -424,7 +424,7 @@ ssize_t __kernel_read(struct file *file, void *buf, size_t count, loff_t *pos)
init_sync_kiocb(&kiocb, file);
    kiocb.ki_pos = pos ? *pos : 0;
-	iov_iter_kvec(&iter, READ, &iov, 1, iov.iov_len);
+	iov_iter_kvec(&iter, ITER_DEST, &iov, 1, iov.iov_len);
    ret = file->f_op->read_iter(&kiocb, &iter);
    if (ret > 0) {
    	if (pos)
@@ -486,7 +486,7 @@ static ssize_t new_sync_write(struct file *filp, const char __user *buf, size_t
init_sync_kiocb(&kiocb, filp);
    kiocb.ki_pos = (ppos ? *ppos : 0);
-	iov_iter_ubuf(&iter, WRITE, (void __user *)buf, len);
+	iov_iter_ubuf(&iter, ITER_SOURCE, (void __user *)buf, len);
ret = call_write_iter(filp, &kiocb, &iter);
    BUG_ON(ret == -EIOCBQUEUED);
@@ -533,7 +533,7 @@ ssize_t __kernel_write(struct file *file, const void *buf, size_t count, loff_t
    	.iov_len	= min_t(size_t, count, MAX_RW_COUNT),
    };
    struct iov_iter iter;
-	iov_iter_kvec(&iter, WRITE, &iov, 1, iov.iov_len);
+	iov_iter_kvec(&iter, ITER_SOURCE, &iov, 1, iov.iov_len);
    return __kernel_write_iter(file, &iter, pos);
 }
 /*
@@ -911,7 +911,7 @@ static ssize_t vfs_readv(struct file *file, const struct iovec __user *vec,
    struct iov_iter iter;
    ssize_t ret;
-	ret = import_iovec(READ, vec, vlen, ARRAY_SIZE(iovstack), &iov, &iter);
+	ret = import_iovec(ITER_DEST, vec, vlen, ARRAY_SIZE(iovstack), &iov, &iter);
    if (ret >= 0) {
    	ret = do_iter_read(file, &iter, pos, flags);
    	kfree(iov);
@@ -928,7 +928,7 @@ static ssize_t vfs_writev(struct file *file, const struct iovec __user *vec,
    struct iov_iter iter;
    ssize_t ret;
-	ret = import_iovec(WRITE, vec, vlen, ARRAY_SIZE(iovstack), &iov, &iter);
+	ret = import_iovec(ITER_SOURCE, vec, vlen, ARRAY_SIZE(iovstack), &iov, &iter);
    if (ret >= 0) {
    	file_start_write(file);
    	ret = do_iter_write(file, &iter, pos, flags);
diff --git a/fs/seq_file.c b/fs/seq_file.c
index 9456a2032224..f5fdaf3b1572 100644
--- a/fs/seq_file.c
+++ b/fs/seq_file.c
@@ -156,7 +156,7 @@ ssize_t seq_read(struct file *file, char __user *buf, size_t size, loff_t *ppos)
    ssize_t ret;
init_sync_kiocb(&kiocb, file);
-	iov_iter_init(&iter, READ, &iov, 1, size);
+	iov_iter_init(&iter, ITER_DEST, &iov, 1, size);
kiocb.ki_pos = *ppos;
    ret = seq_read_iter(&kiocb, &iter);
diff --git a/fs/splice.c b/fs/splice.c
index 0878b852b355..5969b7a1d353 100644
--- a/fs/splice.c
+++ b/fs/splice.c
@@ -303,7 +303,7 @@ ssize_t generic_file_splice_read(struct file *in, loff_t *ppos,
    struct kiocb kiocb;
    int ret;
-	iov_iter_pipe(&to, READ, pipe, len);
+	iov_iter_pipe(&to, ITER_DEST, pipe, len);
    init_sync_kiocb(&kiocb, in);
    kiocb.ki_pos = *ppos;
    ret = call_read_iter(in, &kiocb, &to);
@@ -682,7 +682,7 @@ iter_file_splice_write(struct pipe_inode_info *pipe, struct file *out,
    		n++;
    	}
-		iov_iter_bvec(&from, WRITE, array, n, sd.total_len - left);
+		iov_iter_bvec(&from, ITER_SOURCE, array, n, sd.total_len - left);
    	ret = vfs_iter_write(out, &from, &sd.pos, 0);
    	if (ret <= 0)
    		break;
@@ -1263,9 +1263,9 @@ static int vmsplice_type(struct fd f, int *type)
    if (!f.file)
    	return -EBADF;
    if (f.file->f_mode & FMODE_WRITE) {
-		*type = WRITE;
+		*type = ITER_SOURCE;
    } else if (f.file->f_mode & FMODE_READ) {
-		*type = READ;
+		*type = ITER_DEST;
    } else {
    	fdput(f);
    	return -EBADF;
@@ -1314,7 +1314,7 @@ SYSCALL_DEFINE4(vmsplice, int, fd, const struct iovec __user *, uiov,
if (!iov_iter_count(&iter))
    	error = 0;
-	else if (iov_iter_rw(&iter) == WRITE)
+	else if (type == ITER_SOURCE)
    	error = vmsplice_to_pipe(f.file, &iter, flags);
    else
    	error = vmsplice_to_user(f.file, &iter, flags);
diff --git a/include/linux/uio.h b/include/linux/uio.h
index 2e3134b14ffd..87fc3d0dda98 100644
--- a/include/linux/uio.h
+++ b/include/linux/uio.h
@@ -29,6 +29,9 @@ enum iter_type {
    ITER_UBUF,
 };
+#define ITER_SOURCE	1	// == WRITE
+#define ITER_DEST	0	// == READ
+
 struct iov_iter_state {
    size_t iov_offset;
    size_t count;
diff --git a/io_uring/net.c b/io_uring/net.c
index 9046e269e5a5..520a73b5a448 100644
--- a/io_uring/net.c
+++ b/io_uring/net.c
@@ -364,7 +364,7 @@ int io_send(struct io_kiocb *req, unsigned int issue_flags)
    if (unlikely(!sock))
    	return -ENOTSOCK;
-	ret = import_single_range(WRITE, sr->buf, sr->len, &iov, &msg.msg_iter);
+	ret = import_single_range(ITER_SOURCE, sr->buf, sr->len, &iov, &msg.msg_iter);
    if (unlikely(ret))
    	return ret;
@@ -450,7 +450,7 @@ static int __io_recvmsg_copy_hdr(struct io_kiocb *req,
    	}
    } else {
    	iomsg->free_iov = iomsg->fast_iov;
-		ret = __import_iovec(READ, msg.msg_iov, msg.msg_iovlen, UIO_FASTIOV,
+		ret = __import_iovec(ITER_DEST, msg.msg_iov, msg.msg_iovlen, UIO_FASTIOV,
    			     &iomsg->free_iov, &iomsg->msg.msg_iter,
    			     false);
    	if (ret > 0)
@@ -503,7 +503,7 @@ static int __io_compat_recvmsg_copy_hdr(struct io_kiocb *req,
    	}
    } else {
    	iomsg->free_iov = iomsg->fast_iov;
-		ret = __import_iovec(READ, (struct iovec __user *)uiov, msg.msg_iovlen,
+		ret = __import_iovec(ITER_DEST, (struct iovec __user *)uiov, msg.msg_iovlen,
    			   UIO_FASTIOV, &iomsg->free_iov,
    			   &iomsg->msg.msg_iter, true);
    	if (ret < 0)
@@ -763,7 +763,7 @@ int io_recvmsg(struct io_kiocb *req, unsigned int issue_flags)
kmsg->fast_iov[0].iov_base = buf;
    	kmsg->fast_iov[0].iov_len = len;
-		iov_iter_init(&kmsg->msg.msg_iter, READ, kmsg->fast_iov, 1,
+		iov_iter_init(&kmsg->msg.msg_iter, ITER_DEST, kmsg->fast_iov, 1,
    			len);
    }
@@ -857,7 +857,7 @@ int io_recv(struct io_kiocb *req, unsigned int issue_flags)
    	sr->buf = buf;
    }
-	ret = import_single_range(READ, sr->buf, len, &iov, &msg.msg_iter);
+	ret = import_single_range(ITER_DEST, sr->buf, len, &iov, &msg.msg_iter);
    if (unlikely(ret))
    	goto out_free;
@@ -1097,13 +1097,13 @@ int io_send_zc(struct io_kiocb *req, unsigned int issue_flags)
    	return io_setup_async_addr(req, &__address, issue_flags);
if (zc->flags & IORING_RECVSEND_FIXED_BUF) {
-		ret = io_import_fixed(WRITE, &msg.msg_iter, req->imu,
+		ret = io_import_fixed(ITER_SOURCE, &msg.msg_iter, req->imu,
    				(u64)(uintptr_t)zc->buf, zc->len);
    	if (unlikely(ret))
    		return ret;
    	msg.sg_from_iter = io_sg_from_iter;
    } else {
-		ret = import_single_range(WRITE, zc->buf, zc->len, &iov,
+		ret = import_single_range(ITER_SOURCE, zc->buf, zc->len, &iov,
    				  &msg.msg_iter);
    	if (unlikely(ret))
    		return ret;
diff --git a/io_uring/rw.c b/io_uring/rw.c
index 6223472095d2..0218fae12edd 100644
--- a/io_uring/rw.c
+++ b/io_uring/rw.c
@@ -548,12 +548,12 @@ static inline int io_rw_prep_async(struct io_kiocb *req, int rw)
int io_readv_prep_async(struct io_kiocb *req)
 {
-	return io_rw_prep_async(req, READ);
+	return io_rw_prep_async(req, ITER_DEST);
 }
int io_writev_prep_async(struct io_kiocb *req)
 {
-	return io_rw_prep_async(req, WRITE);
+	return io_rw_prep_async(req, ITER_SOURCE);
 }
/*
@@ -704,7 +704,7 @@ int io_read(struct io_kiocb *req, unsigned int issue_flags)
    loff_t *ppos;
if (!req_has_async_data(req)) {
-		ret = io_import_iovec(READ, req, &iovec, s, issue_flags);
+		ret = io_import_iovec(ITER_DEST, req, &iovec, s, issue_flags);
    	if (unlikely(ret < 0))
    		return ret;
    } else {
@@ -716,7 +716,7 @@ int io_read(struct io_kiocb *req, unsigned int issue_flags)
    	 * buffers, as we dropped the selected one before retry.
    	 */
    	if (io_do_buffer_select(req)) {
-			ret = io_import_iovec(READ, req, &iovec, s, issue_flags);
+			ret = io_import_iovec(ITER_DEST, req, &iovec, s, issue_flags);
    		if (unlikely(ret < 0))
    			return ret;
    	}
@@ -851,7 +851,7 @@ int io_write(struct io_kiocb *req, unsigned int issue_flags)
    loff_t *ppos;
if (!req_has_async_data(req)) {
-		ret = io_import_iovec(WRITE, req, &iovec, s, issue_flags);
+		ret = io_import_iovec(ITER_SOURCE, req, &iovec, s, issue_flags);
    	if (unlikely(ret < 0))
    		return ret;
    } else {
diff --git a/kernel/trace/trace_events_user.c b/kernel/trace/trace_events_user.c
index 9cb53182bb31..908e8a13c675 100644
--- a/kernel/trace/trace_events_user.c
+++ b/kernel/trace/trace_events_user.c
@@ -1489,7 +1489,7 @@ static ssize_t user_events_write(struct file *file, const char __user *ubuf,
    if (unlikely(*ppos != 0))
    	return -EFAULT;
-	if (unlikely(import_single_range(WRITE, (char __user *)ubuf,
+	if (unlikely(import_single_range(ITER_SOURCE, (char __user *)ubuf,
    				 count, &iov, &i)))
    	return -EFAULT;
diff --git a/mm/madvise.c b/mm/madvise.c
index b913ba6efc10..d03e149ffe6e 100644
--- a/mm/madvise.c
+++ b/mm/madvise.c
@@ -1459,7 +1459,7 @@ SYSCALL_DEFINE5(process_madvise, int, pidfd, const struct iovec __user *, vec,
    	goto out;
    }
-	ret = import_iovec(READ, vec, vlen, ARRAY_SIZE(iovstack), &iov, &iter);
+	ret = import_iovec(ITER_DEST, vec, vlen, ARRAY_SIZE(iovstack), &iov, &iter);
    if (ret < 0)
    	goto out;
diff --git a/mm/page_io.c b/mm/page_io.c
index 2af34dd8fa4d..3a5f921b932e 100644
--- a/mm/page_io.c
+++ b/mm/page_io.c
@@ -376,7 +376,7 @@ void swap_write_unplug(struct swap_iocb *sio)
    struct address_space *mapping = sio->iocb.ki_filp->f_mapping;
    int ret;
-	iov_iter_bvec(&from, WRITE, sio->bvec, sio->pages, sio->len);
+	iov_iter_bvec(&from, ITER_SOURCE, sio->bvec, sio->pages, sio->len);
    ret = mapping->a_ops->swap_rw(&sio->iocb, &from);
    if (ret != -EIOCBQUEUED)
    	sio_write_complete(&sio->iocb, ret);
@@ -530,7 +530,7 @@ void __swap_read_unplug(struct swap_iocb *sio)
    struct address_space *mapping = sio->iocb.ki_filp->f_mapping;
    int ret;
-	iov_iter_bvec(&from, READ, sio->bvec, sio->pages, sio->len);
+	iov_iter_bvec(&from, ITER_DEST, sio->bvec, sio->pages, sio->len);
    ret = mapping->a_ops->swap_rw(&sio->iocb, &from);
    if (ret != -EIOCBQUEUED)
    	sio_read_complete(&sio->iocb, ret);
diff --git a/mm/process_vm_access.c b/mm/process_vm_access.c
index 4bcc11958089..78dfaf9e8990 100644
--- a/mm/process_vm_access.c
+++ b/mm/process_vm_access.c
@@ -263,7 +263,7 @@ static ssize_t process_vm_rw(pid_t pid,
    struct iovec *iov_r;
    struct iov_iter iter;
    ssize_t rc;
-	int dir = vm_write ? WRITE : READ;
+	int dir = vm_write ? ITER_SOURCE : ITER_DEST;
if (flags != 0)
    	return -EINVAL;
diff --git a/net/9p/client.c b/net/9p/client.c
index b5aa25f82b78..554a4b11f4fe 100644
--- a/net/9p/client.c
+++ b/net/9p/client.c
@@ -2049,7 +2049,7 @@ int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset)
    struct kvec kv = {.iov_base = data, .iov_len = count};
    struct iov_iter to;
-	iov_iter_kvec(&to, READ, &kv, 1, count);
+	iov_iter_kvec(&to, ITER_DEST, &kv, 1, count);
p9_debug(P9_DEBUG_9P, ">>> TREADDIR fid %d offset %llu count %d\n",
    	 fid->fid, offset, count);
diff --git a/net/bluetooth/6lowpan.c b/net/bluetooth/6lowpan.c
index c57d643afb10..4eb1b3ced0d2 100644
--- a/net/bluetooth/6lowpan.c
+++ b/net/bluetooth/6lowpan.c
@@ -441,7 +441,7 @@ static int send_pkt(struct l2cap_chan *chan, struct sk_buff *skb,
    iv.iov_len = skb->len;
memset(&msg, 0, sizeof(msg));
-	iov_iter_kvec(&msg.msg_iter, WRITE, &iv, 1, skb->len);
+	iov_iter_kvec(&msg.msg_iter, ITER_SOURCE, &iv, 1, skb->len);
err = l2cap_chan_send(chan, &msg, skb->len);
    if (err > 0) {
diff --git a/net/bluetooth/a2mp.c b/net/bluetooth/a2mp.c
index 1fcc482397c3..e7adb8a98cf9 100644
--- a/net/bluetooth/a2mp.c
+++ b/net/bluetooth/a2mp.c
@@ -56,7 +56,7 @@ static void a2mp_send(struct amp_mgr *mgr, u8 code, u8 ident, u16 len, void *dat
memset(&msg, 0, sizeof(msg));
-	iov_iter_kvec(&msg.msg_iter, WRITE, &iv, 1, total_len);
+	iov_iter_kvec(&msg.msg_iter, ITER_SOURCE, &iv, 1, total_len);
l2cap_chan_send(chan, &msg, total_len);
diff --git a/net/bluetooth/smp.c b/net/bluetooth/smp.c
index 11f853d0500f..70663229b3cc 100644
--- a/net/bluetooth/smp.c
+++ b/net/bluetooth/smp.c
@@ -605,7 +605,7 @@ static void smp_send_cmd(struct l2cap_conn *conn, u8 code, u16 len, void *data)
memset(&msg, 0, sizeof(msg));
-	iov_iter_kvec(&msg.msg_iter, WRITE, iv, 2, 1 + len);
+	iov_iter_kvec(&msg.msg_iter, ITER_SOURCE, iv, 2, 1 + len);
l2cap_chan_send(chan, &msg, 1 + len);
diff --git a/net/ceph/messenger_v1.c b/net/ceph/messenger_v1.c
index 3ddbde87e4d6..d1787d7d33ef 100644
--- a/net/ceph/messenger_v1.c
+++ b/net/ceph/messenger_v1.c
@@ -30,7 +30,7 @@ static int ceph_tcp_recvmsg(struct socket *sock, void *buf, size_t len)
    if (!buf)
    	msg.msg_flags |= MSG_TRUNC;
-	iov_iter_kvec(&msg.msg_iter, READ, &iov, 1, len);
+	iov_iter_kvec(&msg.msg_iter, ITER_DEST, &iov, 1, len);
    r = sock_recvmsg(sock, &msg, msg.msg_flags);
    if (r == -EAGAIN)
    	r = 0;
@@ -49,7 +49,7 @@ static int ceph_tcp_recvpage(struct socket *sock, struct page *page,
    int r;
BUG_ON(page_offset + length > PAGE_SIZE);
-	iov_iter_bvec(&msg.msg_iter, READ, &bvec, 1, length);
+	iov_iter_bvec(&msg.msg_iter, ITER_DEST, &bvec, 1, length);
    r = sock_recvmsg(sock, &msg, msg.msg_flags);
    if (r == -EAGAIN)
    	r = 0;
diff --git a/net/ceph/messenger_v2.c b/net/ceph/messenger_v2.c
index cc8ff81a50b7..3009028c4fa2 100644
--- a/net/ceph/messenger_v2.c
+++ b/net/ceph/messenger_v2.c
@@ -168,7 +168,7 @@ static int do_try_sendpage(struct socket *sock, struct iov_iter *it)
    					  bv.bv_offset, bv.bv_len,
    					  CEPH_MSG_FLAGS);
    	} else {
-			iov_iter_bvec(&msg.msg_iter, WRITE, &bv, 1, bv.bv_len);
+			iov_iter_bvec(&msg.msg_iter, ITER_SOURCE, &bv, 1, bv.bv_len);
    		ret = sock_sendmsg(sock, &msg);
    	}
    	if (ret <= 0) {
@@ -225,7 +225,7 @@ static void reset_in_kvecs(struct ceph_connection *con)
    WARN_ON(iov_iter_count(&con->v2.in_iter));
con->v2.in_kvec_cnt = 0;
-	iov_iter_kvec(&con->v2.in_iter, READ, con->v2.in_kvecs, 0, 0);
+	iov_iter_kvec(&con->v2.in_iter, ITER_DEST, con->v2.in_kvecs, 0, 0);
 }
static void set_in_bvec(struct ceph_connection *con, const struct bio_vec *bv)
@@ -233,7 +233,7 @@ static void set_in_bvec(struct ceph_connection *con, const struct bio_vec *bv)
    WARN_ON(iov_iter_count(&con->v2.in_iter));
con->v2.in_bvec = *bv;
-	iov_iter_bvec(&con->v2.in_iter, READ, &con->v2.in_bvec, 1, bv->bv_len);
+	iov_iter_bvec(&con->v2.in_iter, ITER_DEST, &con->v2.in_bvec, 1, bv->bv_len);
 }
static void set_in_skip(struct ceph_connection *con, int len)
@@ -241,7 +241,7 @@ static void set_in_skip(struct ceph_connection *con, int len)
    WARN_ON(iov_iter_count(&con->v2.in_iter));
dout("%s con %p len %d\n", __func__, con, len);
-	iov_iter_discard(&con->v2.in_iter, READ, len);
+	iov_iter_discard(&con->v2.in_iter, ITER_DEST, len);
 }
static void add_out_kvec(struct ceph_connection *con, void *buf, int len)
@@ -265,7 +265,7 @@ static void reset_out_kvecs(struct ceph_connection *con)
con->v2.out_kvec_cnt = 0;
-	iov_iter_kvec(&con->v2.out_iter, WRITE, con->v2.out_kvecs, 0, 0);
+	iov_iter_kvec(&con->v2.out_iter, ITER_SOURCE, con->v2.out_kvecs, 0, 0);
    con->v2.out_iter_sendpage = false;
 }
@@ -277,7 +277,7 @@ static void set_out_bvec(struct ceph_connection *con, const struct bio_vec *bv,
con->v2.out_bvec = *bv;
    con->v2.out_iter_sendpage = zerocopy;
-	iov_iter_bvec(&con->v2.out_iter, WRITE, &con->v2.out_bvec, 1,
+	iov_iter_bvec(&con->v2.out_iter, ITER_SOURCE, &con->v2.out_bvec, 1,
    	      con->v2.out_bvec.bv_len);
 }
@@ -290,7 +290,7 @@ static void set_out_bvec_zero(struct ceph_connection *con)
    con->v2.out_bvec.bv_offset = 0;
    con->v2.out_bvec.bv_len = min(con->v2.out_zero, (int)PAGE_SIZE);
    con->v2.out_iter_sendpage = true;
-	iov_iter_bvec(&con->v2.out_iter, WRITE, &con->v2.out_bvec, 1,
+	iov_iter_bvec(&con->v2.out_iter, ITER_SOURCE, &con->v2.out_bvec, 1,
    	      con->v2.out_bvec.bv_len);
 }
diff --git a/net/compat.c b/net/compat.c
index 385f04a6be2f..161b7bea1f62 100644
--- a/net/compat.c
+++ b/net/compat.c
@@ -95,7 +95,8 @@ int get_compat_msghdr(struct msghdr *kmsg,
    if (err)
    	return err;
-	err = import_iovec(save_addr ? READ : WRITE, compat_ptr(msg.msg_iov), msg.msg_iovlen,
+	err = import_iovec(save_addr ? ITER_DEST : ITER_SOURCE,
+			   compat_ptr(msg.msg_iov), msg.msg_iovlen,
    		   UIO_FASTIOV, iov, &kmsg->msg_iter);
    return err < 0 ? err : 0;
 }
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index ec19ed722453..6667c3538f2a 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -2001,7 +2001,7 @@ static int receive_fallback_to_copy(struct sock *sk,
    if (copy_address != zc->copybuf_address)
    	return -EINVAL;
-	err = import_single_range(READ, (void __user *)copy_address,
+	err = import_single_range(ITER_DEST, (void __user *)copy_address,
    			  inq, &iov, &msg.msg_iter);
    if (err)
    	return err;
@@ -2035,7 +2035,7 @@ static int tcp_copy_straggler_data(struct tcp_zerocopy_receive *zc,
    if (copy_address != zc->copybuf_address)
    	return -EINVAL;
-	err = import_single_range(READ, (void __user *)copy_address,
+	err = import_single_range(ITER_DEST, (void __user *)copy_address,
    			  copylen, &iov, &msg.msg_iter);
    if (err)
    	return err;
diff --git a/net/netfilter/ipvs/ip_vs_sync.c b/net/netfilter/ipvs/ip_vs_sync.c
index a56fd0b5a430..4963fec815da 100644
--- a/net/netfilter/ipvs/ip_vs_sync.c
+++ b/net/netfilter/ipvs/ip_vs_sync.c
@@ -1617,7 +1617,7 @@ ip_vs_receive(struct socket *sock, char *buffer, const size_t buflen)
    EnterFunction(7);
/* Receive a packet */
-	iov_iter_kvec(&msg.msg_iter, READ, &iov, 1, buflen);
+	iov_iter_kvec(&msg.msg_iter, ITER_DEST, &iov, 1, buflen);
    len = sock_recvmsg(sock, &msg, MSG_DONTWAIT);
    if (len < 0)
    	return len;
diff --git a/net/smc/smc_clc.c b/net/smc/smc_clc.c
index 1472f31480d8..dfb9797f7bc6 100644
--- a/net/smc/smc_clc.c
+++ b/net/smc/smc_clc.c
@@ -673,7 +673,7 @@ int smc_clc_wait_msg(struct smc_sock *smc, void *buf, int buflen,
     */
    krflags = MSG_PEEK | MSG_WAITALL;
    clc_sk->sk_rcvtimeo = timeout;
-	iov_iter_kvec(&msg.msg_iter, READ, &vec, 1,
+	iov_iter_kvec(&msg.msg_iter, ITER_DEST, &vec, 1,
    		sizeof(struct smc_clc_msg_hdr));
    len = sock_recvmsg(smc->clcsock, &msg, krflags);
    if (signal_pending(current)) {
@@ -720,7 +720,7 @@ int smc_clc_wait_msg(struct smc_sock *smc, void *buf, int buflen,
    } else {
    	recvlen = datlen;
    }
-	iov_iter_kvec(&msg.msg_iter, READ, &vec, 1, recvlen);
+	iov_iter_kvec(&msg.msg_iter, ITER_DEST, &vec, 1, recvlen);
    krflags = MSG_WAITALL;
    len = sock_recvmsg(smc->clcsock, &msg, krflags);
    if (len < recvlen || !smc_clc_msg_hdr_valid(clcm, check_trl)) {
@@ -737,7 +737,7 @@ int smc_clc_wait_msg(struct smc_sock *smc, void *buf, int buflen,
    	/* receive remaining proposal message */
    	recvlen = datlen > SMC_CLC_RECV_BUF_LEN ?
    					SMC_CLC_RECV_BUF_LEN : datlen;
-		iov_iter_kvec(&msg.msg_iter, READ, &vec, 1, recvlen);
+		iov_iter_kvec(&msg.msg_iter, ITER_DEST, &vec, 1, recvlen);
    	len = sock_recvmsg(smc->clcsock, &msg, krflags);
    	datlen -= len;
    }
diff --git a/net/smc/smc_tx.c b/net/smc/smc_tx.c
index 64dedffe9d26..f4b6a71ac488 100644
--- a/net/smc/smc_tx.c
+++ b/net/smc/smc_tx.c
@@ -308,7 +308,7 @@ int smc_tx_sendpage(struct smc_sock *smc, struct page *page, int offset,
iov.iov_base = kaddr + offset;
    iov.iov_len = size;
-	iov_iter_kvec(&msg.msg_iter, WRITE, &iov, 1, size);
+	iov_iter_kvec(&msg.msg_iter, ITER_SOURCE, &iov, 1, size);
    rc = smc_tx_sendmsg(smc, &msg, size);
    kunmap(page);
    return rc;
diff --git a/net/socket.c b/net/socket.c
index 00da9ce3dba0..73463c7c3702 100644
--- a/net/socket.c
+++ b/net/socket.c
@@ -750,7 +750,7 @@ EXPORT_SYMBOL(sock_sendmsg);
 int kernel_sendmsg(struct socket *sock, struct msghdr *msg,
    	   struct kvec *vec, size_t num, size_t size)
 {
-	iov_iter_kvec(&msg->msg_iter, WRITE, vec, num, size);
+	iov_iter_kvec(&msg->msg_iter, ITER_SOURCE, vec, num, size);
    return sock_sendmsg(sock, msg);
 }
 EXPORT_SYMBOL(kernel_sendmsg);
@@ -776,7 +776,7 @@ int kernel_sendmsg_locked(struct sock *sk, struct msghdr *msg,
    if (!sock->ops->sendmsg_locked)
    	return sock_no_sendmsg_locked(sk, msg, size);
-	iov_iter_kvec(&msg->msg_iter, WRITE, vec, num, size);
+	iov_iter_kvec(&msg->msg_iter, ITER_SOURCE, vec, num, size);
return sock->ops->sendmsg_locked(sk, msg, msg_data_left(msg));
 }
@@ -1034,7 +1034,7 @@ int kernel_recvmsg(struct socket *sock, struct msghdr *msg,
    	   struct kvec *vec, size_t num, size_t size, int flags)
 {
    msg->msg_control_is_user = false;
-	iov_iter_kvec(&msg->msg_iter, READ, vec, num, size);
+	iov_iter_kvec(&msg->msg_iter, ITER_DEST, vec, num, size);
    return sock_recvmsg(sock, msg, flags);
 }
 EXPORT_SYMBOL(kernel_recvmsg);
@@ -2092,7 +2092,7 @@ int __sys_sendto(int fd, void __user *buff, size_t len, unsigned int flags,
    struct iovec iov;
    int fput_needed;
-	err = import_single_range(WRITE, buff, len, &iov, &msg.msg_iter);
+	err = import_single_range(ITER_SOURCE, buff, len, &iov, &msg.msg_iter);
    if (unlikely(err))
    	return err;
    sock = sockfd_lookup_light(fd, &err, &fput_needed);
@@ -2157,7 +2157,7 @@ int __sys_recvfrom(int fd, void __user *ubuf, size_t size, unsigned int flags,
    int err, err2;
    int fput_needed;
-	err = import_single_range(READ, ubuf, size, &iov, &msg.msg_iter);
+	err = import_single_range(ITER_DEST, ubuf, size, &iov, &msg.msg_iter);
    if (unlikely(err))
    	return err;
    sock = sockfd_lookup_light(fd, &err, &fput_needed);
@@ -2417,7 +2417,7 @@ static int copy_msghdr_from_user(struct msghdr *kmsg,
    if (err)
    	return err;
-	err = import_iovec(save_addr ? READ : WRITE,
+	err = import_iovec(save_addr ? ITER_DEST : ITER_SOURCE,
    		    msg.msg_iov, msg.msg_iovlen,
    		    UIO_FASTIOV, iov, &kmsg->msg_iter);
    return err < 0 ? err : 0;
diff --git a/net/sunrpc/socklib.c b/net/sunrpc/socklib.c
index 71ba4cf513bc..1b2b84feeec6 100644
--- a/net/sunrpc/socklib.c
+++ b/net/sunrpc/socklib.c
@@ -214,14 +214,14 @@ static inline int xprt_sendmsg(struct socket *sock, struct msghdr *msg,
 static int xprt_send_kvec(struct socket *sock, struct msghdr *msg,
    		  struct kvec *vec, size_t seek)
 {
-	iov_iter_kvec(&msg->msg_iter, WRITE, vec, 1, vec->iov_len);
+	iov_iter_kvec(&msg->msg_iter, ITER_SOURCE, vec, 1, vec->iov_len);
    return xprt_sendmsg(sock, msg, seek);
 }
static int xprt_send_pagedata(struct socket *sock, struct msghdr *msg,
    		      struct xdr_buf *xdr, size_t base)
 {
-	iov_iter_bvec(&msg->msg_iter, WRITE, xdr->bvec, xdr_buf_pagecount(xdr),
+	iov_iter_bvec(&msg->msg_iter, ITER_SOURCE, xdr->bvec, xdr_buf_pagecount(xdr),
    	      xdr->page_len + xdr->page_base);
    return xprt_sendmsg(sock, msg, base + xdr->page_base);
 }
@@ -244,7 +244,7 @@ static int xprt_send_rm_and_kvec(struct socket *sock, struct msghdr *msg,
    };
    size_t len = iov[0].iov_len + iov[1].iov_len;
-	iov_iter_kvec(&msg->msg_iter, WRITE, iov, 2, len);
+	iov_iter_kvec(&msg->msg_iter, ITER_SOURCE, iov, 2, len);
    return xprt_sendmsg(sock, msg, base);
 }
diff --git a/net/sunrpc/svcsock.c b/net/sunrpc/svcsock.c
index e833103f4629..815baf308236 100644
--- a/net/sunrpc/svcsock.c
+++ b/net/sunrpc/svcsock.c
@@ -260,7 +260,7 @@ static ssize_t svc_tcp_read_msg(struct svc_rqst *rqstp, size_t buflen,
    rqstp->rq_respages = &rqstp->rq_pages[i];
    rqstp->rq_next_page = rqstp->rq_respages + 1;
-	iov_iter_bvec(&msg.msg_iter, READ, bvec, i, buflen);
+	iov_iter_bvec(&msg.msg_iter, ITER_DEST, bvec, i, buflen);
    if (seek) {
    	iov_iter_advance(&msg.msg_iter, seek);
    	buflen -= seek;
@@ -874,7 +874,7 @@ static ssize_t svc_tcp_read_marker(struct svc_sock *svsk,
    	want = sizeof(rpc_fraghdr) - svsk->sk_tcplen;
    	iov.iov_base = ((char *)&svsk->sk_marker) + svsk->sk_tcplen;
    	iov.iov_len  = want;
-		iov_iter_kvec(&msg.msg_iter, READ, &iov, 1, want);
+		iov_iter_kvec(&msg.msg_iter, ITER_DEST, &iov, 1, want);
    	len = sock_recvmsg(svsk->sk_sock, &msg, MSG_DONTWAIT);
    	if (len < 0)
    		return len;
diff --git a/net/sunrpc/xprtsock.c b/net/sunrpc/xprtsock.c
index 915b9902f673..b3ab6d9d752e 100644
--- a/net/sunrpc/xprtsock.c
+++ b/net/sunrpc/xprtsock.c
@@ -364,7 +364,7 @@ static ssize_t
 xs_read_kvec(struct socket *sock, struct msghdr *msg, int flags,
    	struct kvec *kvec, size_t count, size_t seek)
 {
-	iov_iter_kvec(&msg->msg_iter, READ, kvec, 1, count);
+	iov_iter_kvec(&msg->msg_iter, ITER_DEST, kvec, 1, count);
    return xs_sock_recvmsg(sock, msg, flags, seek);
 }
@@ -373,7 +373,7 @@ xs_read_bvec(struct socket *sock, struct msghdr *msg, int flags,
    	struct bio_vec *bvec, unsigned long nr, size_t count,
    	size_t seek)
 {
-	iov_iter_bvec(&msg->msg_iter, READ, bvec, nr, count);
+	iov_iter_bvec(&msg->msg_iter, ITER_DEST, bvec, nr, count);
    return xs_sock_recvmsg(sock, msg, flags, seek);
 }
@@ -381,7 +381,7 @@ static ssize_t
 xs_read_discard(struct socket *sock, struct msghdr *msg, int flags,
    	size_t count)
 {
-	iov_iter_discard(&msg->msg_iter, READ, count);
+	iov_iter_discard(&msg->msg_iter, ITER_DEST, count);
    return sock_recvmsg(sock, msg, flags);
 }
diff --git a/net/tipc/topsrv.c b/net/tipc/topsrv.c
index e3b427a70398..69c88cc03887 100644
--- a/net/tipc/topsrv.c
+++ b/net/tipc/topsrv.c
@@ -396,7 +396,7 @@ static int tipc_conn_rcv_from_sock(struct tipc_conn *con)
    iov.iov_base = &s;
    iov.iov_len = sizeof(s);
    msg.msg_name = NULL;
-	iov_iter_kvec(&msg.msg_iter, READ, &iov, 1, iov.iov_len);
+	iov_iter_kvec(&msg.msg_iter, ITER_DEST, &iov, 1, iov.iov_len);
    ret = sock_recvmsg(con->sock, &msg, MSG_DONTWAIT);
    if (ret == -EWOULDBLOCK)
    	return -EWOULDBLOCK;
diff --git a/net/tls/tls_device.c b/net/tls/tls_device.c
index a03d66046ca3..6c593788dc25 100644
--- a/net/tls/tls_device.c
+++ b/net/tls/tls_device.c
@@ -620,7 +620,7 @@ int tls_device_sendpage(struct sock *sk, struct page *page,
    kaddr = kmap(page);
    iov.iov_base = kaddr + offset;
    iov.iov_len = size;
-	iov_iter_kvec(&msg_iter, WRITE, &iov, 1, size);
+	iov_iter_kvec(&msg_iter, ITER_SOURCE, &iov, 1, size);
    iter_offset.msg_iter = &msg_iter;
    rc = tls_push_data(sk, iter_offset, size, flags, TLS_RECORD_TYPE_DATA,
    		   NULL);
@@ -697,7 +697,7 @@ static int tls_device_push_pending_record(struct sock *sk, int flags)
    union tls_iter_offset iter;
    struct iov_iter msg_iter;
-	iov_iter_kvec(&msg_iter, WRITE, NULL, 0, 0);
+	iov_iter_kvec(&msg_iter, ITER_SOURCE, NULL, 0, 0);
    iter.msg_iter = &msg_iter;
    return tls_push_data(sk, iter, 0, flags, TLS_RECORD_TYPE_DATA, NULL);
 }
diff --git a/net/xfrm/espintcp.c b/net/xfrm/espintcp.c
index 29a540dcb5a7..d6fece1ed982 100644
--- a/net/xfrm/espintcp.c
+++ b/net/xfrm/espintcp.c
@@ -354,7 +354,7 @@ static int espintcp_sendmsg(struct sock *sk, struct msghdr *msg, size_t size)
    *((__be16 *)buf) = cpu_to_be16(msglen);
    pfx_iov.iov_base = buf;
    pfx_iov.iov_len = sizeof(buf);
-	iov_iter_kvec(&pfx_iter, WRITE, &pfx_iov, 1, pfx_iov.iov_len);
+	iov_iter_kvec(&pfx_iter, ITER_SOURCE, &pfx_iov, 1, pfx_iov.iov_len);
err = sk_msg_memcopy_from_iter(sk, &pfx_iter, &emsg->skmsg,
    			       pfx_iov.iov_len);
diff --git a/security/keys/keyctl.c b/security/keys/keyctl.c
index 96a92a645216..d54f73c558f7 100644
--- a/security/keys/keyctl.c
+++ b/security/keys/keyctl.c
@@ -1251,7 +1251,7 @@ long keyctl_instantiate_key(key_serial_t id,
    	struct iov_iter from;
    	int ret;
-		ret = import_single_range(WRITE, (void __user *)_payload, plen,
+		ret = import_single_range(ITER_SOURCE, (void __user *)_payload, plen,
    				  &iov, &from);
    	if (unlikely(ret))
    		return ret;
@@ -1283,7 +1283,7 @@ long keyctl_instantiate_key_iov(key_serial_t id,
    if (!_payload_iov)
    	ioc = 0;
-	ret = import_iovec(WRITE, _payload_iov, ioc,
+	ret = import_iovec(ITER_SOURCE, _payload_iov, ioc,
    			    ARRAY_SIZE(iovstack), &iov, &from);
    if (ret < 0)
    	return ret;
-- 
2.39.0




    

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[PATCH 6.1 038/208] use less confusing names for iov_iter direction initializers