[Feature]add MT2731_MP2_MR2_SVN388 baseline version
Change-Id: Ief04314834b31e27effab435d3ca8ba33b499059
diff --git a/src/kernel/linux/v4.14/fs/afs/rxrpc.c b/src/kernel/linux/v4.14/fs/afs/rxrpc.c
new file mode 100644
index 0000000..7dc9c78
--- /dev/null
+++ b/src/kernel/linux/v4.14/fs/afs/rxrpc.c
@@ -0,0 +1,895 @@
+/* Maintain an RxRPC server socket to do AFS communications through
+ *
+ * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/slab.h>
+#include <linux/sched/signal.h>
+
+#include <net/sock.h>
+#include <net/af_rxrpc.h>
+#include "internal.h"
+#include "afs_cm.h"
+
+struct socket *afs_socket; /* my RxRPC socket */
+static struct workqueue_struct *afs_async_calls;
+static struct afs_call *afs_spare_incoming_call;
+atomic_t afs_outstanding_calls;
+
+static void afs_wake_up_call_waiter(struct sock *, struct rxrpc_call *, unsigned long);
+static int afs_wait_for_call_to_complete(struct afs_call *);
+static void afs_wake_up_async_call(struct sock *, struct rxrpc_call *, unsigned long);
+static void afs_process_async_call(struct work_struct *);
+static void afs_rx_new_call(struct sock *, struct rxrpc_call *, unsigned long);
+static void afs_rx_discard_new_call(struct rxrpc_call *, unsigned long);
+static int afs_deliver_cm_op_id(struct afs_call *);
+
+/* asynchronous incoming call initial processing */
+static const struct afs_call_type afs_RXCMxxxx = {
+ .name = "CB.xxxx",
+ .deliver = afs_deliver_cm_op_id,
+ .abort_to_error = afs_abort_to_error,
+};
+
+static void afs_charge_preallocation(struct work_struct *);
+
+static DECLARE_WORK(afs_charge_preallocation_work, afs_charge_preallocation);
+
+static int afs_wait_atomic_t(atomic_t *p)
+{
+ schedule();
+ return 0;
+}
+
+/*
+ * open an RxRPC socket and bind it to be a server for callback notifications
+ * - the socket is left in blocking mode and non-blocking ops use MSG_DONTWAIT
+ */
+int afs_open_socket(void)
+{
+ struct sockaddr_rxrpc srx;
+ struct socket *socket;
+ unsigned int min_level;
+ int ret;
+
+ _enter("");
+
+ ret = -ENOMEM;
+ afs_async_calls = alloc_workqueue("kafsd", WQ_MEM_RECLAIM, 0);
+ if (!afs_async_calls)
+ goto error_0;
+
+ ret = sock_create_kern(&init_net, AF_RXRPC, SOCK_DGRAM, PF_INET, &socket);
+ if (ret < 0)
+ goto error_1;
+
+ socket->sk->sk_allocation = GFP_NOFS;
+
+ /* bind the callback manager's address to make this a server socket */
+ srx.srx_family = AF_RXRPC;
+ srx.srx_service = CM_SERVICE;
+ srx.transport_type = SOCK_DGRAM;
+ srx.transport_len = sizeof(srx.transport.sin);
+ srx.transport.sin.sin_family = AF_INET;
+ srx.transport.sin.sin_port = htons(AFS_CM_PORT);
+ memset(&srx.transport.sin.sin_addr, 0,
+ sizeof(srx.transport.sin.sin_addr));
+
+ min_level = RXRPC_SECURITY_ENCRYPT;
+ ret = kernel_setsockopt(socket, SOL_RXRPC, RXRPC_MIN_SECURITY_LEVEL,
+ (void *)&min_level, sizeof(min_level));
+ if (ret < 0)
+ goto error_2;
+
+ ret = kernel_bind(socket, (struct sockaddr *) &srx, sizeof(srx));
+ if (ret < 0)
+ goto error_2;
+
+ rxrpc_kernel_new_call_notification(socket, afs_rx_new_call,
+ afs_rx_discard_new_call);
+
+ ret = kernel_listen(socket, INT_MAX);
+ if (ret < 0)
+ goto error_2;
+
+ afs_socket = socket;
+ afs_charge_preallocation(NULL);
+ _leave(" = 0");
+ return 0;
+
+error_2:
+ sock_release(socket);
+error_1:
+ destroy_workqueue(afs_async_calls);
+error_0:
+ _leave(" = %d", ret);
+ return ret;
+}
+
+/*
+ * close the RxRPC socket AFS was using
+ */
+void afs_close_socket(void)
+{
+ _enter("");
+
+ kernel_listen(afs_socket, 0);
+ flush_workqueue(afs_async_calls);
+
+ if (afs_spare_incoming_call) {
+ afs_put_call(afs_spare_incoming_call);
+ afs_spare_incoming_call = NULL;
+ }
+
+ _debug("outstanding %u", atomic_read(&afs_outstanding_calls));
+ wait_on_atomic_t(&afs_outstanding_calls, afs_wait_atomic_t,
+ TASK_UNINTERRUPTIBLE);
+ _debug("no outstanding calls");
+
+ kernel_sock_shutdown(afs_socket, SHUT_RDWR);
+ flush_workqueue(afs_async_calls);
+ sock_release(afs_socket);
+
+ _debug("dework");
+ destroy_workqueue(afs_async_calls);
+ _leave("");
+}
+
+/*
+ * Allocate a call.
+ */
+static struct afs_call *afs_alloc_call(const struct afs_call_type *type,
+ gfp_t gfp)
+{
+ struct afs_call *call;
+ int o;
+
+ call = kzalloc(sizeof(*call), gfp);
+ if (!call)
+ return NULL;
+
+ call->type = type;
+ atomic_set(&call->usage, 1);
+ INIT_WORK(&call->async_work, afs_process_async_call);
+ init_waitqueue_head(&call->waitq);
+
+ o = atomic_inc_return(&afs_outstanding_calls);
+ trace_afs_call(call, afs_call_trace_alloc, 1, o,
+ __builtin_return_address(0));
+ return call;
+}
+
+/*
+ * Dispose of a reference on a call.
+ */
+void afs_put_call(struct afs_call *call)
+{
+ int n = atomic_dec_return(&call->usage);
+ int o = atomic_read(&afs_outstanding_calls);
+
+ trace_afs_call(call, afs_call_trace_put, n, o,
+ __builtin_return_address(0));
+
+ ASSERTCMP(n, >=, 0);
+ if (n == 0) {
+ ASSERT(!work_pending(&call->async_work));
+ ASSERT(call->type->name != NULL);
+
+ if (call->rxcall) {
+ rxrpc_kernel_end_call(afs_socket, call->rxcall);
+ call->rxcall = NULL;
+ }
+ if (call->type->destructor)
+ call->type->destructor(call);
+
+ kfree(call->request);
+ kfree(call);
+
+ o = atomic_dec_return(&afs_outstanding_calls);
+ trace_afs_call(call, afs_call_trace_free, 0, o,
+ __builtin_return_address(0));
+ if (o == 0)
+ wake_up_atomic_t(&afs_outstanding_calls);
+ }
+}
+
+/*
+ * Queue the call for actual work. Returns 0 unconditionally for convenience.
+ */
+int afs_queue_call_work(struct afs_call *call)
+{
+ int u = atomic_inc_return(&call->usage);
+
+ trace_afs_call(call, afs_call_trace_work, u,
+ atomic_read(&afs_outstanding_calls),
+ __builtin_return_address(0));
+
+ INIT_WORK(&call->work, call->type->work);
+
+ if (!queue_work(afs_wq, &call->work))
+ afs_put_call(call);
+ return 0;
+}
+
+/*
+ * allocate a call with flat request and reply buffers
+ */
+struct afs_call *afs_alloc_flat_call(const struct afs_call_type *type,
+ size_t request_size, size_t reply_max)
+{
+ struct afs_call *call;
+
+ call = afs_alloc_call(type, GFP_NOFS);
+ if (!call)
+ goto nomem_call;
+
+ if (request_size) {
+ call->request_size = request_size;
+ call->request = kmalloc(request_size, GFP_NOFS);
+ if (!call->request)
+ goto nomem_free;
+ }
+
+ if (reply_max) {
+ call->reply_max = reply_max;
+ call->buffer = kmalloc(reply_max, GFP_NOFS);
+ if (!call->buffer)
+ goto nomem_free;
+ }
+
+ init_waitqueue_head(&call->waitq);
+ return call;
+
+nomem_free:
+ afs_put_call(call);
+nomem_call:
+ return NULL;
+}
+
+/*
+ * clean up a call with flat buffer
+ */
+void afs_flat_call_destructor(struct afs_call *call)
+{
+ _enter("");
+
+ kfree(call->request);
+ call->request = NULL;
+ kfree(call->buffer);
+ call->buffer = NULL;
+}
+
+#define AFS_BVEC_MAX 8
+
+/*
+ * Load the given bvec with the next few pages.
+ */
+static void afs_load_bvec(struct afs_call *call, struct msghdr *msg,
+ struct bio_vec *bv, pgoff_t first, pgoff_t last,
+ unsigned offset)
+{
+ struct page *pages[AFS_BVEC_MAX];
+ unsigned int nr, n, i, to, bytes = 0;
+
+ nr = min_t(pgoff_t, last - first + 1, AFS_BVEC_MAX);
+ n = find_get_pages_contig(call->mapping, first, nr, pages);
+ ASSERTCMP(n, ==, nr);
+
+ msg->msg_flags |= MSG_MORE;
+ for (i = 0; i < nr; i++) {
+ to = PAGE_SIZE;
+ if (first + i >= last) {
+ to = call->last_to;
+ msg->msg_flags &= ~MSG_MORE;
+ }
+ bv[i].bv_page = pages[i];
+ bv[i].bv_len = to - offset;
+ bv[i].bv_offset = offset;
+ bytes += to - offset;
+ offset = 0;
+ }
+
+ iov_iter_bvec(&msg->msg_iter, WRITE | ITER_BVEC, bv, nr, bytes);
+}
+
+/*
+ * Advance the AFS call state when the RxRPC call ends the transmit phase.
+ */
+static void afs_notify_end_request_tx(struct sock *sock,
+ struct rxrpc_call *rxcall,
+ unsigned long call_user_ID)
+{
+ struct afs_call *call = (struct afs_call *)call_user_ID;
+
+ if (call->state == AFS_CALL_REQUESTING)
+ call->state = AFS_CALL_AWAIT_REPLY;
+}
+
+/*
+ * attach the data from a bunch of pages on an inode to a call
+ */
+static int afs_send_pages(struct afs_call *call, struct msghdr *msg)
+{
+ struct bio_vec bv[AFS_BVEC_MAX];
+ unsigned int bytes, nr, loop, offset;
+ pgoff_t first = call->first, last = call->last;
+ int ret;
+
+ offset = call->first_offset;
+ call->first_offset = 0;
+
+ do {
+ afs_load_bvec(call, msg, bv, first, last, offset);
+ offset = 0;
+ bytes = msg->msg_iter.count;
+ nr = msg->msg_iter.nr_segs;
+
+ ret = rxrpc_kernel_send_data(afs_socket, call->rxcall, msg,
+ bytes, afs_notify_end_request_tx);
+ for (loop = 0; loop < nr; loop++)
+ put_page(bv[loop].bv_page);
+ if (ret < 0)
+ break;
+
+ first += nr;
+ } while (first <= last);
+
+ return ret;
+}
+
+/*
+ * initiate a call
+ */
+int afs_make_call(struct in_addr *addr, struct afs_call *call, gfp_t gfp,
+ bool async)
+{
+ struct sockaddr_rxrpc srx;
+ struct rxrpc_call *rxcall;
+ struct msghdr msg;
+ struct kvec iov[1];
+ size_t offset;
+ s64 tx_total_len;
+ u32 abort_code;
+ int ret;
+
+ _enter("%x,{%d},", addr->s_addr, ntohs(call->port));
+
+ ASSERT(call->type != NULL);
+ ASSERT(call->type->name != NULL);
+
+ _debug("____MAKE %p{%s,%x} [%d]____",
+ call, call->type->name, key_serial(call->key),
+ atomic_read(&afs_outstanding_calls));
+
+ call->async = async;
+
+ memset(&srx, 0, sizeof(srx));
+ srx.srx_family = AF_RXRPC;
+ srx.srx_service = call->service_id;
+ srx.transport_type = SOCK_DGRAM;
+ srx.transport_len = sizeof(srx.transport.sin);
+ srx.transport.sin.sin_family = AF_INET;
+ srx.transport.sin.sin_port = call->port;
+ memcpy(&srx.transport.sin.sin_addr, addr, 4);
+
+ /* Work out the length we're going to transmit. This is awkward for
+ * calls such as FS.StoreData where there's an extra injection of data
+ * after the initial fixed part.
+ */
+ tx_total_len = call->request_size;
+ if (call->send_pages) {
+ if (call->last == call->first) {
+ tx_total_len += call->last_to - call->first_offset;
+ } else {
+ /* It looks mathematically like you should be able to
+ * combine the following lines with the ones above, but
+ * unsigned arithmetic is fun when it wraps...
+ */
+ tx_total_len += PAGE_SIZE - call->first_offset;
+ tx_total_len += call->last_to;
+ tx_total_len += (call->last - call->first - 1) * PAGE_SIZE;
+ }
+ }
+
+ /* create a call */
+ rxcall = rxrpc_kernel_begin_call(afs_socket, &srx, call->key,
+ (unsigned long)call,
+ tx_total_len, gfp,
+ (async ?
+ afs_wake_up_async_call :
+ afs_wake_up_call_waiter));
+ call->key = NULL;
+ if (IS_ERR(rxcall)) {
+ ret = PTR_ERR(rxcall);
+ goto error_kill_call;
+ }
+
+ call->rxcall = rxcall;
+
+ /* send the request */
+ iov[0].iov_base = call->request;
+ iov[0].iov_len = call->request_size;
+
+ msg.msg_name = NULL;
+ msg.msg_namelen = 0;
+ iov_iter_kvec(&msg.msg_iter, WRITE | ITER_KVEC, iov, 1,
+ call->request_size);
+ msg.msg_control = NULL;
+ msg.msg_controllen = 0;
+ msg.msg_flags = (call->send_pages ? MSG_MORE : 0);
+
+ /* We have to change the state *before* sending the last packet as
+ * rxrpc might give us the reply before it returns from sending the
+ * request. Further, if the send fails, we may already have been given
+ * a notification and may have collected it.
+ */
+ if (!call->send_pages)
+ call->state = AFS_CALL_AWAIT_REPLY;
+ ret = rxrpc_kernel_send_data(afs_socket, rxcall,
+ &msg, call->request_size,
+ afs_notify_end_request_tx);
+ if (ret < 0)
+ goto error_do_abort;
+
+ if (call->send_pages) {
+ ret = afs_send_pages(call, &msg);
+ if (ret < 0)
+ goto error_do_abort;
+ }
+
+ /* at this point, an async call may no longer exist as it may have
+ * already completed */
+ if (call->async)
+ return -EINPROGRESS;
+
+ return afs_wait_for_call_to_complete(call);
+
+error_do_abort:
+ call->state = AFS_CALL_COMPLETE;
+ if (ret != -ECONNABORTED) {
+ rxrpc_kernel_abort_call(afs_socket, rxcall, RX_USER_ABORT,
+ ret, "KSD");
+ } else {
+ abort_code = 0;
+ offset = 0;
+ rxrpc_kernel_recv_data(afs_socket, rxcall, NULL, 0, &offset,
+ false, &abort_code);
+ ret = call->type->abort_to_error(abort_code);
+ }
+error_kill_call:
+ afs_put_call(call);
+ _leave(" = %d", ret);
+ return ret;
+}
+
+/*
+ * deliver messages to a call
+ */
+static void afs_deliver_to_call(struct afs_call *call)
+{
+ u32 abort_code;
+ int ret;
+
+ _enter("%s", call->type->name);
+
+ while (call->state == AFS_CALL_AWAIT_REPLY ||
+ call->state == AFS_CALL_AWAIT_OP_ID ||
+ call->state == AFS_CALL_AWAIT_REQUEST ||
+ call->state == AFS_CALL_AWAIT_ACK
+ ) {
+ if (call->state == AFS_CALL_AWAIT_ACK) {
+ size_t offset = 0;
+ ret = rxrpc_kernel_recv_data(afs_socket, call->rxcall,
+ NULL, 0, &offset, false,
+ &call->abort_code);
+ trace_afs_recv_data(call, 0, offset, false, ret);
+
+ if (ret == -EINPROGRESS || ret == -EAGAIN)
+ return;
+ if (ret == 1 || ret < 0) {
+ call->state = AFS_CALL_COMPLETE;
+ goto done;
+ }
+ return;
+ }
+
+ ret = call->type->deliver(call);
+ switch (ret) {
+ case 0:
+ if (call->state == AFS_CALL_AWAIT_REPLY)
+ call->state = AFS_CALL_COMPLETE;
+ goto done;
+ case -EINPROGRESS:
+ case -EAGAIN:
+ goto out;
+ case -ECONNABORTED:
+ goto call_complete;
+ case -ENOTCONN:
+ abort_code = RX_CALL_DEAD;
+ rxrpc_kernel_abort_call(afs_socket, call->rxcall,
+ abort_code, ret, "KNC");
+ goto save_error;
+ case -ENOTSUPP:
+ abort_code = RXGEN_OPCODE;
+ rxrpc_kernel_abort_call(afs_socket, call->rxcall,
+ abort_code, ret, "KIV");
+ goto save_error;
+ case -ENODATA:
+ case -EBADMSG:
+ case -EMSGSIZE:
+ default:
+ abort_code = RXGEN_CC_UNMARSHAL;
+ if (call->state != AFS_CALL_AWAIT_REPLY)
+ abort_code = RXGEN_SS_UNMARSHAL;
+ rxrpc_kernel_abort_call(afs_socket, call->rxcall,
+ abort_code, -EBADMSG, "KUM");
+ goto save_error;
+ }
+ }
+
+done:
+ if (call->state == AFS_CALL_COMPLETE && call->incoming)
+ afs_put_call(call);
+out:
+ _leave("");
+ return;
+
+save_error:
+ call->error = ret;
+call_complete:
+ call->state = AFS_CALL_COMPLETE;
+ goto done;
+}
+
+/*
+ * wait synchronously for a call to complete
+ */
+static int afs_wait_for_call_to_complete(struct afs_call *call)
+{
+ int ret;
+
+ DECLARE_WAITQUEUE(myself, current);
+
+ _enter("");
+
+ add_wait_queue(&call->waitq, &myself);
+ for (;;) {
+ set_current_state(TASK_INTERRUPTIBLE);
+
+ /* deliver any messages that are in the queue */
+ if (call->state < AFS_CALL_COMPLETE && call->need_attention) {
+ call->need_attention = false;
+ __set_current_state(TASK_RUNNING);
+ afs_deliver_to_call(call);
+ continue;
+ }
+
+ if (call->state == AFS_CALL_COMPLETE ||
+ signal_pending(current))
+ break;
+ schedule();
+ }
+
+ remove_wait_queue(&call->waitq, &myself);
+ __set_current_state(TASK_RUNNING);
+
+ /* Kill off the call if it's still live. */
+ if (call->state < AFS_CALL_COMPLETE) {
+ _debug("call interrupted");
+ rxrpc_kernel_abort_call(afs_socket, call->rxcall,
+ RX_USER_ABORT, -EINTR, "KWI");
+ }
+
+ ret = call->error;
+ _debug("call complete");
+ afs_put_call(call);
+ _leave(" = %d", ret);
+ return ret;
+}
+
+/*
+ * wake up a waiting call
+ */
+static void afs_wake_up_call_waiter(struct sock *sk, struct rxrpc_call *rxcall,
+ unsigned long call_user_ID)
+{
+ struct afs_call *call = (struct afs_call *)call_user_ID;
+
+ call->need_attention = true;
+ wake_up(&call->waitq);
+}
+
+/*
+ * wake up an asynchronous call
+ */
+static void afs_wake_up_async_call(struct sock *sk, struct rxrpc_call *rxcall,
+ unsigned long call_user_ID)
+{
+ struct afs_call *call = (struct afs_call *)call_user_ID;
+ int u;
+
+ trace_afs_notify_call(rxcall, call);
+ call->need_attention = true;
+
+ u = __atomic_add_unless(&call->usage, 1, 0);
+ if (u != 0) {
+ trace_afs_call(call, afs_call_trace_wake, u + 1,
+ atomic_read(&afs_outstanding_calls),
+ __builtin_return_address(0));
+
+ if (!queue_work(afs_async_calls, &call->async_work))
+ afs_put_call(call);
+ }
+}
+
+/*
+ * Delete an asynchronous call. The work item carries a ref to the call struct
+ * that we need to release.
+ */
+static void afs_delete_async_call(struct work_struct *work)
+{
+ struct afs_call *call = container_of(work, struct afs_call, async_work);
+
+ _enter("");
+
+ afs_put_call(call);
+
+ _leave("");
+}
+
+/*
+ * Perform I/O processing on an asynchronous call. The work item carries a ref
+ * to the call struct that we either need to release or to pass on.
+ */
+static void afs_process_async_call(struct work_struct *work)
+{
+ struct afs_call *call = container_of(work, struct afs_call, async_work);
+
+ _enter("");
+
+ if (call->state < AFS_CALL_COMPLETE && call->need_attention) {
+ call->need_attention = false;
+ afs_deliver_to_call(call);
+ }
+
+ if (call->state == AFS_CALL_COMPLETE) {
+ call->reply = NULL;
+
+ /* We have two refs to release - one from the alloc and one
+ * queued with the work item - and we can't just deallocate the
+ * call because the work item may be queued again.
+ */
+ call->async_work.func = afs_delete_async_call;
+ if (!queue_work(afs_async_calls, &call->async_work))
+ afs_put_call(call);
+ }
+
+ afs_put_call(call);
+ _leave("");
+}
+
+static void afs_rx_attach(struct rxrpc_call *rxcall, unsigned long user_call_ID)
+{
+ struct afs_call *call = (struct afs_call *)user_call_ID;
+
+ call->rxcall = rxcall;
+}
+
+/*
+ * Charge the incoming call preallocation.
+ */
+static void afs_charge_preallocation(struct work_struct *work)
+{
+ struct afs_call *call = afs_spare_incoming_call;
+
+ for (;;) {
+ if (!call) {
+ call = afs_alloc_call(&afs_RXCMxxxx, GFP_KERNEL);
+ if (!call)
+ break;
+
+ call->async = true;
+ call->state = AFS_CALL_AWAIT_OP_ID;
+ init_waitqueue_head(&call->waitq);
+ }
+
+ if (rxrpc_kernel_charge_accept(afs_socket,
+ afs_wake_up_async_call,
+ afs_rx_attach,
+ (unsigned long)call,
+ GFP_KERNEL) < 0)
+ break;
+ call = NULL;
+ }
+ afs_spare_incoming_call = call;
+}
+
+/*
+ * Discard a preallocated call when a socket is shut down.
+ */
+static void afs_rx_discard_new_call(struct rxrpc_call *rxcall,
+ unsigned long user_call_ID)
+{
+ struct afs_call *call = (struct afs_call *)user_call_ID;
+
+ call->rxcall = NULL;
+ afs_put_call(call);
+}
+
+/*
+ * Notification of an incoming call.
+ */
+static void afs_rx_new_call(struct sock *sk, struct rxrpc_call *rxcall,
+ unsigned long user_call_ID)
+{
+ queue_work(afs_wq, &afs_charge_preallocation_work);
+}
+
+/*
+ * Grab the operation ID from an incoming cache manager call. The socket
+ * buffer is discarded on error or if we don't yet have sufficient data.
+ */
+static int afs_deliver_cm_op_id(struct afs_call *call)
+{
+ int ret;
+
+ _enter("{%zu}", call->offset);
+
+ ASSERTCMP(call->offset, <, 4);
+
+ /* the operation ID forms the first four bytes of the request data */
+ ret = afs_extract_data(call, &call->tmp, 4, true);
+ if (ret < 0)
+ return ret;
+
+ call->operation_ID = ntohl(call->tmp);
+ call->state = AFS_CALL_AWAIT_REQUEST;
+ call->offset = 0;
+
+ /* ask the cache manager to route the call (it'll change the call type
+ * if successful) */
+ if (!afs_cm_incoming_call(call))
+ return -ENOTSUPP;
+
+ trace_afs_cb_call(call);
+
+ /* pass responsibility for the remainer of this message off to the
+ * cache manager op */
+ return call->type->deliver(call);
+}
+
+/*
+ * Advance the AFS call state when an RxRPC service call ends the transmit
+ * phase.
+ */
+static void afs_notify_end_reply_tx(struct sock *sock,
+ struct rxrpc_call *rxcall,
+ unsigned long call_user_ID)
+{
+ struct afs_call *call = (struct afs_call *)call_user_ID;
+
+ if (call->state == AFS_CALL_REPLYING)
+ call->state = AFS_CALL_AWAIT_ACK;
+}
+
+/*
+ * send an empty reply
+ */
+void afs_send_empty_reply(struct afs_call *call)
+{
+ struct msghdr msg;
+
+ _enter("");
+
+ rxrpc_kernel_set_tx_length(afs_socket, call->rxcall, 0);
+
+ msg.msg_name = NULL;
+ msg.msg_namelen = 0;
+ iov_iter_kvec(&msg.msg_iter, WRITE | ITER_KVEC, NULL, 0, 0);
+ msg.msg_control = NULL;
+ msg.msg_controllen = 0;
+ msg.msg_flags = 0;
+
+ call->state = AFS_CALL_AWAIT_ACK;
+ switch (rxrpc_kernel_send_data(afs_socket, call->rxcall, &msg, 0,
+ afs_notify_end_reply_tx)) {
+ case 0:
+ _leave(" [replied]");
+ return;
+
+ case -ENOMEM:
+ _debug("oom");
+ rxrpc_kernel_abort_call(afs_socket, call->rxcall,
+ RX_USER_ABORT, -ENOMEM, "KOO");
+ default:
+ _leave(" [error]");
+ return;
+ }
+}
+
+/*
+ * send a simple reply
+ */
+void afs_send_simple_reply(struct afs_call *call, const void *buf, size_t len)
+{
+ struct msghdr msg;
+ struct kvec iov[1];
+ int n;
+
+ _enter("");
+
+ rxrpc_kernel_set_tx_length(afs_socket, call->rxcall, len);
+
+ iov[0].iov_base = (void *) buf;
+ iov[0].iov_len = len;
+ msg.msg_name = NULL;
+ msg.msg_namelen = 0;
+ iov_iter_kvec(&msg.msg_iter, WRITE | ITER_KVEC, iov, 1, len);
+ msg.msg_control = NULL;
+ msg.msg_controllen = 0;
+ msg.msg_flags = 0;
+
+ call->state = AFS_CALL_AWAIT_ACK;
+ n = rxrpc_kernel_send_data(afs_socket, call->rxcall, &msg, len,
+ afs_notify_end_reply_tx);
+ if (n >= 0) {
+ /* Success */
+ _leave(" [replied]");
+ return;
+ }
+
+ if (n == -ENOMEM) {
+ _debug("oom");
+ rxrpc_kernel_abort_call(afs_socket, call->rxcall,
+ RX_USER_ABORT, -ENOMEM, "KOO");
+ }
+ _leave(" [error]");
+}
+
+/*
+ * Extract a piece of data from the received data socket buffers.
+ */
+int afs_extract_data(struct afs_call *call, void *buf, size_t count,
+ bool want_more)
+{
+ int ret;
+
+ _enter("{%s,%zu},,%zu,%d",
+ call->type->name, call->offset, count, want_more);
+
+ ASSERTCMP(call->offset, <=, count);
+
+ ret = rxrpc_kernel_recv_data(afs_socket, call->rxcall,
+ buf, count, &call->offset,
+ want_more, &call->abort_code);
+ trace_afs_recv_data(call, count, call->offset, want_more, ret);
+ if (ret == 0 || ret == -EAGAIN)
+ return ret;
+
+ if (ret == 1) {
+ switch (call->state) {
+ case AFS_CALL_AWAIT_REPLY:
+ call->state = AFS_CALL_COMPLETE;
+ break;
+ case AFS_CALL_AWAIT_REQUEST:
+ call->state = AFS_CALL_REPLYING;
+ break;
+ default:
+ break;
+ }
+ return 0;
+ }
+
+ if (ret == -ECONNABORTED)
+ call->error = call->type->abort_to_error(call->abort_code);
+ else
+ call->error = ret;
+ call->state = AFS_CALL_COMPLETE;
+ return ret;
+}