HWPOISON: Define a new error_remove_page address space op for async truncation

[safe/jmp/linux-2.6] / Documentation / filesystems / vfs.txt

diff --git a/Documentation/filesystems/vfs.txt b/Documentation/filesystems/vfs.txt
index f49eecf..623f094 100644 (file)
--- a/Documentation/filesystems/vfs.txt
+++ b/Documentation/filesystems/vfs.txt
@@ -536,6 +536,7 @@ struct address_space_operations {
        /* migrate the contents of a page to the specified target */
        int (*migratepage) (struct page *, struct page *);
        int (*launder_page) (struct page *);
+       int (*error_remove_page) (struct mapping *mapping, struct page *page);
 };
 
   writepage: called by the VM to write a dirty page to backing store.
@@ -694,6 +695,12 @@ struct address_space_operations {
        prevent redirtying the page, it is kept locked during the whole
        operation.
 
+  error_remove_page: normally set to generic_error_remove_page if truncation
+       is ok for this address space. Used for memory failure handling.
+       Setting this implies you deal with pages going away under you,
+       unless you have them locked or reference counts increased.
+
+
 The File Object
 ===============