don't put symlink bodies in pagecache into highmem

[mirror_ubuntu-zesty-kernel.git] / Documentation / filesystems / porting

diff --git a/Documentation/filesystems/porting b/Documentation/filesystems/porting
index f24d1b8339576e96c46045f5da8f275ee9250056..3eb7c35c9698d01adadc4d2cf337c249341f7ea6 100644 (file)
--- a/Documentation/filesystems/porting
+++ b/Documentation/filesystems/porting
@@ -504,3 +504,8 @@ in your dentry operations instead.
 [mandatory]
        __fd_install() & fd_install() can now sleep. Callers should not
        hold a spinlock or other resources that do not allow a schedule.
+--
+[mandatory]
+       any symlink that might use page_follow_link_light/page_put_link() must
+       have inode_nohighmem(inode) called before anything might start playing with
+       its pagecache.