Use pipe_discard_from() explicitly in generic_file_read_iter(); don't bother
with rather non-obvious use of iov_iter_advance() in there.
Signed-off-by: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
---
fs/splice.c | 7 ++-----
1 file changed, 2 insertions(+), 5 deletions(-)
diff --git a/fs/splice.c b/fs/splice.c
index 047b79db8eb5..6645b30ec990 100644
--- a/fs/splice.c
+++ b/fs/splice.c
@@ -301,11 +301,9 @@ ssize_t generic_file_splice_read(struct file *in, loff_t *ppos,
{
struct iov_iter to;
struct kiocb kiocb;
- unsigned int i_head;
int ret;
iov_iter_pipe(&to, READ, pipe, len);
- i_head = to.head;
init_sync_kiocb(&kiocb, in);
kiocb.ki_pos = *ppos;
ret = call_read_iter(in, &kiocb, &to);
@@ -313,9 +311,8 @@ ssize_t generic_file_splice_read(struct file *in, loff_t *ppos,
*ppos = kiocb.ki_pos;
file_accessed(in);
} else if (ret < 0) {
- to.head = i_head;
- to.iov_offset = 0;
- iov_iter_advance(&to, 0); /* to free what was emitted */
+ /* free what was emitted */
+ pipe_discard_from(pipe, to.start_head);
/*
* callers of ->splice_read() expect -EAGAIN on
* "can't put anything in there", rather than -EFAULT.
--
2.30.2
