iov_iter: Separate type from direction and use accessor functions
In the iov_iter struct, separate the iterator type from the iterator
direction and use accessor functions to access them in most places.
Convert a bunch of places to use switch-statements to access them rather
then chains of bitwise-AND statements. This makes it easier to add further
iterator types. Also, this can be more efficient as to implement a switch
of small contiguous integers, the compiler can use ~50% fewer compare
instructions than it has to use bitwise-and instructions.
Further, cease passing the iterator type into the iterator setup function.
The iterator function can set that itself. Only the direction is required.
Signed-off-by: David Howells <dhowells@redhat.com>
diff --git a/fs/afs/rxrpc.c b/fs/afs/rxrpc.c
index 77a8379..639c168 100644
--- a/fs/afs/rxrpc.c
+++ b/fs/afs/rxrpc.c
@@ -286,7 +286,7 @@ static void afs_load_bvec(struct afs_call *call, struct msghdr *msg,
offset = 0;
}
- iov_iter_bvec(&msg->msg_iter, WRITE | ITER_BVEC, bv, nr, bytes);
+ iov_iter_bvec(&msg->msg_iter, WRITE, bv, nr, bytes);
}
/*
@@ -401,8 +401,7 @@ long afs_make_call(struct afs_addr_cursor *ac, struct afs_call *call,
msg.msg_name = NULL;
msg.msg_namelen = 0;
- iov_iter_kvec(&msg.msg_iter, WRITE | ITER_KVEC, iov, 1,
- call->request_size);
+ iov_iter_kvec(&msg.msg_iter, WRITE, iov, 1, call->request_size);
msg.msg_control = NULL;
msg.msg_controllen = 0;
msg.msg_flags = MSG_WAITALL | (call->send_pages ? MSG_MORE : 0);
@@ -432,7 +431,7 @@ long afs_make_call(struct afs_addr_cursor *ac, struct afs_call *call,
rxrpc_kernel_abort_call(call->net->socket, rxcall,
RX_USER_ABORT, ret, "KSD");
} else {
- iov_iter_kvec(&msg.msg_iter, READ | ITER_KVEC, NULL, 0, 0);
+ iov_iter_kvec(&msg.msg_iter, READ, NULL, 0, 0);
rxrpc_kernel_recv_data(call->net->socket, rxcall,
&msg.msg_iter, false,
&call->abort_code, &call->service_id);
@@ -468,7 +467,7 @@ static void afs_deliver_to_call(struct afs_call *call)
if (state == AFS_CALL_SV_AWAIT_ACK) {
struct iov_iter iter;
- iov_iter_kvec(&iter, READ | ITER_KVEC, NULL, 0, 0);
+ iov_iter_kvec(&iter, READ, NULL, 0, 0);
ret = rxrpc_kernel_recv_data(call->net->socket,
call->rxcall, &iter, false,
&remote_abort,
@@ -825,7 +824,7 @@ void afs_send_empty_reply(struct afs_call *call)
msg.msg_name = NULL;
msg.msg_namelen = 0;
- iov_iter_kvec(&msg.msg_iter, WRITE | ITER_KVEC, NULL, 0, 0);
+ iov_iter_kvec(&msg.msg_iter, WRITE, NULL, 0, 0);
msg.msg_control = NULL;
msg.msg_controllen = 0;
msg.msg_flags = 0;
@@ -864,7 +863,7 @@ 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 | ITER_KVEC, iov, 1, len);
+ iov_iter_kvec(&msg.msg_iter, WRITE, iov, 1, len);
msg.msg_control = NULL;
msg.msg_controllen = 0;
msg.msg_flags = 0;
@@ -905,7 +904,7 @@ int afs_extract_data(struct afs_call *call, void *buf, size_t count,
iov.iov_base = buf + call->offset;
iov.iov_len = count - call->offset;
- iov_iter_kvec(&iter, ITER_KVEC | READ, &iov, 1, count - call->offset);
+ iov_iter_kvec(&iter, READ, &iov, 1, count - call->offset);
ret = rxrpc_kernel_recv_data(net->socket, call->rxcall, &iter,
want_more, &remote_abort,
