Make vfs_splice_read() return immediately if the length is 0. Signed-off-by: David Howells <dhowells@xxxxxxxxxx> Reviewed-by: Christoph Hellwig <hch@xxxxxx> Reviewed-by: Christian Brauner <brauner@xxxxxxxxxx> cc: Jens Axboe <axboe@xxxxxxxxx> cc: Al Viro <viro@xxxxxxxxxxxxxxxxxx> cc: linux-block@xxxxxxxxxxxxxxx cc: linux-fsdevel@xxxxxxxxxxxxxxx cc: linux-mm@xxxxxxxxx --- fs/splice.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/fs/splice.c b/fs/splice.c index d815a69f6589..fe3309ffeb26 100644 --- a/fs/splice.c +++ b/fs/splice.c @@ -891,6 +891,8 @@ long vfs_splice_read(struct file *in, loff_t *ppos, if (unlikely(!(in->f_mode & FMODE_READ))) return -EBADF; + if (!len) + return 0; /* Don't try to read more the pipe has space for. */ p_space = pipe->max_usage - pipe_occupancy(pipe->head, pipe->tail);
