[PATCH] splice: fix bugs with stealing regular pipe pages
- Check that page has suitable count for stealing in the regular pipes.
- pipe_to_file() assumes that the page is locked on succesful steal, so
do that in the pipe steal hook
- Missing unlock_page() in add_to_page_cache() failure.
Signed-off-by: Jens Axboe <axboe@suse.de>
diff --git a/fs/pipe.c b/fs/pipe.c
index 7fefb10..5a36927 100644
--- a/fs/pipe.c
+++ b/fs/pipe.c
@@ -127,8 +127,15 @@
static int anon_pipe_buf_steal(struct pipe_inode_info *pipe,
struct pipe_buffer *buf)
{
- buf->flags |= PIPE_BUF_FLAG_STOLEN;
- return 0;
+ struct page *page = buf->page;
+
+ if (page_count(page) == 1) {
+ buf->flags |= PIPE_BUF_FLAG_STOLEN;
+ lock_page(page);
+ return 0;
+ }
+
+ return 1;
}
static void anon_pipe_buf_get(struct pipe_inode_info *info,