pipe: add pipe_buf_steal() helper
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/drivers/char/virtio_console.c b/drivers/char/virtio_console.c
index 5da47e26..8114744 100644
--- a/drivers/char/virtio_console.c
+++ b/drivers/char/virtio_console.c
@@ -889,7 +889,7 @@
return 0;
/* Try lock this page */
- if (buf->ops->steal(pipe, buf) == 0) {
+ if (pipe_buf_steal(pipe, buf) == 0) {
/* Get reference and unlock page for moving */
get_page(buf->page);
unlock_page(buf->page);
diff --git a/fs/fuse/dev.c b/fs/fuse/dev.c
index e5d5cc9..17a706d 100644
--- a/fs/fuse/dev.c
+++ b/fs/fuse/dev.c
@@ -841,7 +841,7 @@
if (cs->len != PAGE_SIZE)
goto out_fallback;
- if (buf->ops->steal(cs->pipe, buf) != 0)
+ if (pipe_buf_steal(cs->pipe, buf) != 0)
goto out_fallback;
newpage = buf->page;
diff --git a/include/linux/pipe_fs_i.h b/include/linux/pipe_fs_i.h
index 6544133..bddccf0 100644
--- a/include/linux/pipe_fs_i.h
+++ b/include/linux/pipe_fs_i.h
@@ -151,6 +151,17 @@
return buf->ops->confirm(pipe, buf);
}
+/**
+ * pipe_buf_steal - attempt to take ownership of a pipe_buffer
+ * @pipe: the pipe that the buffer belongs to
+ * @buf: the buffer to attempt to steal
+ */
+static inline int pipe_buf_steal(struct pipe_inode_info *pipe,
+ struct pipe_buffer *buf)
+{
+ return buf->ops->steal(pipe, buf);
+}
+
/* Differs from PIPE_BUF in that PIPE_SIZE is the length of the actual
memory allocation, whereas PIPE_BUF makes atomicity guarantees. */
#define PIPE_SIZE PAGE_SIZE