[PATCH] splice: fix page stealing LRU handling.
Originally from Nick Piggin, just adapted to the newer branch.
You can't check PageLRU without holding zone->lru_lock. The page
release code can get away with it only because the page refcount is 0 at
that point. Also, you can't reliably remove pages from the LRU unless
the refcount is 0. Ever.
Signed-off-by: Nick Piggin <nickpiggin@yahoo.com.au>
Signed-off-by: Jens Axboe <axboe@suse.de>
diff --git a/fs/pipe.c b/fs/pipe.c
index 5093408..795df98 100644
--- a/fs/pipe.c
+++ b/fs/pipe.c
@@ -95,6 +95,8 @@
{
struct page *page = buf->page;
+ buf->flags &= ~PIPE_BUF_FLAG_STOLEN;
+
/*
* If nobody else uses this page, and we don't already have a
* temporary page, let's keep track of it as a one-deep
@@ -124,6 +126,7 @@
static int anon_pipe_buf_steal(struct pipe_inode_info *info,
struct pipe_buffer *buf)
{
+ buf->flags |= PIPE_BUF_FLAG_STOLEN;
return 0;
}