Wait for the page to be written to the cache before we allow it
to be modified
Signed-off-by: David Howells <dhowells@redhat.com>
Reviewed-by: Paulo Alcantara (SUSE) <pc@cjr.nz>
Signed-off-by: Steve French <stfrench@microsoft.com>
{
struct page *page = vmf->page;
+ /* Wait for the page to be written to the cache before we allow it to
+ * be modified. We then assume the entire page will need writing back.
+ */
#ifdef CONFIG_CIFS_FSCACHE
if (PageFsCache(page) &&
wait_on_page_fscache_killable(page) < 0)
return VM_FAULT_RETRY;
#endif
- lock_page(page);
+ wait_on_page_writeback(page);
+
+ if (lock_page_killable(page) < 0)
+ return VM_FAULT_RETRY;
return VM_FAULT_LOCKED;
}