[PATCH v1 1/1] fs/splice: add missing callback for inaccessible pages

Claudio Imbrenda
2020-04-28T22:51:04Z

If a page is inaccesible and it is used for things like sendfile, then
the content of the page is not always touched, and can be passed
directly to a driver, causing issues.

This patch fixes the issue by adding a call to arch_make_page_accessible
in page_cache_pipe_buf_confirm; this fixes the issue.

Fixes: f28d43636d6f ("mm/gup/writeback: add callbacks for inaccessible pages")
Signed-off-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
---
fs/splice.c | 3 +++
1 file changed, 3 insertions(+)

diff --git a/fs/splice.c b/fs/splice.c
index 4735defc46ee..f026e0ce9acd 100644
--- a/fs/splice.c
+++ b/fs/splice.c
@@ -106,6 +106,9 @@ static int page_cache_pipe_buf_confirm(struct pipe_inode_info *pipe,
struct page *page = buf->page;
int err;

+ if (arch_make_page_accessible(page))
+ return -EIO;
+
if (!PageUptodate(page)) {
lock_page(page);

--
2.25.4