Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / fs / squashfs / page_actor.h

diff --git a/kernel/fs/squashfs/page_actor.h b/kernel/fs/squashfs/page_actor.h
new file mode 100644 (file)
index 0000000..26dd820
--- /dev/null
+++ b/kernel/fs/squashfs/page_actor.h
@@ -0,0 +1,81 @@
+#ifndef PAGE_ACTOR_H
+#define PAGE_ACTOR_H
+/*
+ * Copyright (c) 2013
+ * Phillip Lougher <phillip@squashfs.org.uk>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2. See
+ * the COPYING file in the top-level directory.
+ */
+
+#ifndef CONFIG_SQUASHFS_FILE_DIRECT
+struct squashfs_page_actor {
+       void    **page;
+       int     pages;
+       int     length;
+       int     next_page;
+};
+
+static inline struct squashfs_page_actor *squashfs_page_actor_init(void **page,
+       int pages, int length)
+{
+       struct squashfs_page_actor *actor = kmalloc(sizeof(*actor), GFP_KERNEL);
+
+       if (actor == NULL)
+               return NULL;
+
+       actor->length = length ? : pages * PAGE_CACHE_SIZE;
+       actor->page = page;
+       actor->pages = pages;
+       actor->next_page = 0;
+       return actor;
+}
+
+static inline void *squashfs_first_page(struct squashfs_page_actor *actor)
+{
+       actor->next_page = 1;
+       return actor->page[0];
+}
+
+static inline void *squashfs_next_page(struct squashfs_page_actor *actor)
+{
+       return actor->next_page == actor->pages ? NULL :
+               actor->page[actor->next_page++];
+}
+
+static inline void squashfs_finish_page(struct squashfs_page_actor *actor)
+{
+       /* empty */
+}
+#else
+struct squashfs_page_actor {
+       union {
+               void            **buffer;
+               struct page     **page;
+       };
+       void    *pageaddr;
+       void    *(*squashfs_first_page)(struct squashfs_page_actor *);
+       void    *(*squashfs_next_page)(struct squashfs_page_actor *);
+       void    (*squashfs_finish_page)(struct squashfs_page_actor *);
+       int     pages;
+       int     length;
+       int     next_page;
+};
+
+extern struct squashfs_page_actor *squashfs_page_actor_init(void **, int, int);
+extern struct squashfs_page_actor *squashfs_page_actor_init_special(struct page
+                                                        **, int, int);
+static inline void *squashfs_first_page(struct squashfs_page_actor *actor)
+{
+       return actor->squashfs_first_page(actor);
+}
+static inline void *squashfs_next_page(struct squashfs_page_actor *actor)
+{
+       return actor->squashfs_next_page(actor);
+}
+static inline void squashfs_finish_page(struct squashfs_page_actor *actor)
+{
+       actor->squashfs_finish_page(actor);
+}
+#endif
+#endif