From: Alexey Kuznetsov <[EMAIL PROTECTED]>
If read failed we cannot map not-uptodate page to user space.
Actually, we are in serious troubles, we do not even know what
process to kill. So, the only variant remains: to stop swapoff()
and allow someone to kill processes to zap invalid pages.
Signed-off-by: Alexey Kuznetsov <[EMAIL PROTECTED]>
Signed-off-by: Alexey Dobriyan <[EMAIL PROTECTED]>
---
mm/swapfile.c | 13 +++++++++++++
1 file changed, 13 insertions(+)
--- a/mm/swapfile.c
+++ b/mm/swapfile.c
@@ -766,6 +766,19 @@ static int try_to_unuse(unsigned int typ
lock_page(page);
wait_on_page_writeback(page);
+ /* If read failed we cannot map not-uptodate page to
+ * user space. Actually, we are in serious troubles,
+ * we do not even know what process to kill. So, the only
+ * variant remains: to stop swapoff() and allow someone
+ * to kill processes to zap invalid pages.
+ */
+ if (unlikely(!PageUptodate(page))) {
+ unlock_page(page);
+ page_cache_release(page);
+ retval = -EIO;
+ break;
+ }
+
/*
* Remove all references to entry.
* Whenever we reach init_mm, there's no address space
-
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