[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 <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
diff --git a/include/linux/pipe_fs_i.h b/include/linux/pipe_fs_i.h
index 70ae933..ec38495 100644
--- a/include/linux/pipe_fs_i.h
+++ b/include/linux/pipe_fs_i.h
@@ -5,10 +5,14 @@
#define PIPE_BUFFERS (16)
+#define PIPE_BUF_FLAG_STOLEN 0x01
+#define PIPE_BUF_FLAG_LRU 0x02
+
struct pipe_buffer {
struct page *page;
unsigned int offset, len;
struct pipe_buf_operations *ops;
+ unsigned int flags;
};
struct pipe_buf_operations {
