ext4: add pre-content fsnotify hook for DAX faults

ext4 has its own handling for DAX faults. Add the pre-content fsnotify
hook for this case.

Signed-off-by: Jan Kara <jack@suse.cz>

diff --git a/fs/ext4/file.c b/fs/ext4/file.c
index 3bd96c3d4cd0ca22c28d8eaa4e20e99135cf3f2a..a5205149adba352c45b1730483fed5730989b3a8 100644 (file)
--- a/fs/ext4/file.c
+++ b/fs/ext4/file.c
@@ -756,6 +756,9 @@ retry:
                        return VM_FAULT_SIGBUS;
                }
        } else {
+               result = filemap_fsnotify_fault(vmf);
+               if (unlikely(result))
+                       return result;
                filemap_invalidate_lock_shared(mapping);
        }
        result = dax_iomap_fault(vmf, order, &pfn, &error, &ext4_iomap_ops);