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iov_iter: Use accessor function

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Use accessor functions to access an iterator's type and direction.  This
allows for the possibility of using some other method of determining the
type of iterator than if-chains with bitwise-AND conditions.

Signed-off-by: David Howells <dhowells@redhat.com>
This commit is contained in:
David Howells
2018-10-22 13:07:28 +01:00
parent 1fcb748d18
commit 00e2370744
14 changed files with 87 additions and 60 deletions
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17
fs/cifs/smbdirect.c
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@@ -2054,14 +2054,22 @@ int smbd_recv(struct smbd_connection *info, struct msghdr *msg)
info->smbd_recv_pending++;
switch (msg->msg_iter.type) {
case READ | ITER_KVEC:
if (iov_iter_rw(&msg->msg_iter) == WRITE) {
/* It's a bug in upper layer to get there */
cifs_dbg(VFS, "CIFS: invalid msg iter dir %u\n",
iov_iter_rw(&msg->msg_iter));
rc = -EINVAL;
goto out;
}
switch (iov_iter_type(&msg->msg_iter)) {
case ITER_KVEC:
buf = msg->msg_iter.kvec->iov_base;
to_read = msg->msg_iter.kvec->iov_len;
rc = smbd_recv_buf(info, buf, to_read);
break;
case READ | ITER_BVEC:
case ITER_BVEC:
page = msg->msg_iter.bvec->bv_page;
page_offset = msg->msg_iter.bvec->bv_offset;
to_read = msg->msg_iter.bvec->bv_len;
@@ -2071,10 +2079,11 @@ int smbd_recv(struct smbd_connection *info, struct msghdr *msg)
default:
/* It's a bug in upper layer to get there */
cifs_dbg(VFS, "CIFS: invalid msg type %d\n",
msg->msg_iter.type);
iov_iter_type(&msg->msg_iter));
rc = -EINVAL;
}
out:
info->smbd_recv_pending--;
wake_up(&info->wait_smbd_recv_pending);