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authorAl Viro <viro@zeniv.linux.org.uk>2022-06-12 16:07:49 -0400
committerAl Viro <viro@zeniv.linux.org.uk>2022-08-08 22:37:16 -0400
commit0d9649341363047be60a9ec7378d8985bdd0abba (patch)
tree4367c03e3c6f81ac6a6205d186ae53cdfe65c307 /fs/splice.c
parent3e20a751aff0e099cff496511fef8cdf655b3360 (diff)
splice: stop abusing iov_iter_advance() to flush a pipe
Use pipe_discard_from() explicitly in generic_file_read_iter(); don't bother with rather non-obvious use of iov_iter_advance() in there. Reviewed-by: Jeff Layton <jlayton@kernel.org> Reviewed-by: Christian Brauner (Microsoft) <brauner@kernel.org> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/splice.c')
-rw-r--r--fs/splice.c7
1 files changed, 2 insertions, 5 deletions
diff --git a/fs/splice.c b/fs/splice.c
index 93a2c9bf6249..877290500050 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.