[PATCH] vmsplice: restrict stealing a little more
Apply the same rules as the anon pipe pages, only allow stealing
if no one else is using the page.
Signed-off-by: Jens Axboe <axboe@suse.de>
diff --git a/fs/pipe.c b/fs/pipe.c
index 3941a7f..5acd895 100644
--- a/fs/pipe.c
+++ b/fs/pipe.c
@@ -184,8 +184,8 @@
kunmap(buf->page);
}
-static int anon_pipe_buf_steal(struct pipe_inode_info *pipe,
- struct pipe_buffer *buf)
+int generic_pipe_buf_steal(struct pipe_inode_info *pipe,
+ struct pipe_buffer *buf)
{
struct page *page = buf->page;
@@ -213,7 +213,7 @@
.unmap = generic_pipe_buf_unmap,
.pin = generic_pipe_buf_pin,
.release = anon_pipe_buf_release,
- .steal = anon_pipe_buf_steal,
+ .steal = generic_pipe_buf_steal,
.get = generic_pipe_buf_get,
};
diff --git a/fs/splice.c b/fs/splice.c
index 3318b96..7fb0497 100644
--- a/fs/splice.c
+++ b/fs/splice.c
@@ -141,7 +141,7 @@
if (!(buf->flags & PIPE_BUF_FLAG_GIFT))
return 1;
- return 0;
+ return generic_pipe_buf_steal(pipe, buf);
}
static struct pipe_buf_operations user_page_pipe_buf_ops = {