mm: remove cleancache

[linux-2.6-block.git] / include / linux / cleancache.h

diff --git a/include/linux/cleancache.h b/include/linux/cleancache.h
deleted file mode 100644 (file)
index 5f5730c..0000000
--- a/include/linux/cleancache.h
+++ /dev/null
@@ -1,124 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-#ifndef _LINUX_CLEANCACHE_H
-#define _LINUX_CLEANCACHE_H
-
-#include <linux/fs.h>
-#include <linux/exportfs.h>
-#include <linux/mm.h>
-
-#define CLEANCACHE_NO_POOL             -1
-#define CLEANCACHE_NO_BACKEND          -2
-#define CLEANCACHE_NO_BACKEND_SHARED   -3
-
-#define CLEANCACHE_KEY_MAX 6
-
-/*
- * cleancache requires every file with a page in cleancache to have a
- * unique key unless/until the file is removed/truncated.  For some
- * filesystems, the inode number is unique, but for "modern" filesystems
- * an exportable filehandle is required (see exportfs.h)
- */
-struct cleancache_filekey {
-       union {
-               ino_t ino;
-               __u32 fh[CLEANCACHE_KEY_MAX];
-               u32 key[CLEANCACHE_KEY_MAX];
-       } u;
-};
-
-struct cleancache_ops {
-       int (*init_fs)(size_t);
-       int (*init_shared_fs)(uuid_t *uuid, size_t);
-       int (*get_page)(int, struct cleancache_filekey,
-                       pgoff_t, struct page *);
-       void (*put_page)(int, struct cleancache_filekey,
-                       pgoff_t, struct page *);
-       void (*invalidate_page)(int, struct cleancache_filekey, pgoff_t);
-       void (*invalidate_inode)(int, struct cleancache_filekey);
-       void (*invalidate_fs)(int);
-};
-
-extern int cleancache_register_ops(const struct cleancache_ops *ops);
-extern void __cleancache_init_fs(struct super_block *);
-extern void __cleancache_init_shared_fs(struct super_block *);
-extern int  __cleancache_get_page(struct page *);
-extern void __cleancache_put_page(struct page *);
-extern void __cleancache_invalidate_page(struct address_space *, struct page *);
-extern void __cleancache_invalidate_inode(struct address_space *);
-extern void __cleancache_invalidate_fs(struct super_block *);
-
-#ifdef CONFIG_CLEANCACHE
-#define cleancache_enabled (1)
-static inline bool cleancache_fs_enabled_mapping(struct address_space *mapping)
-{
-       return mapping->host->i_sb->cleancache_poolid >= 0;
-}
-static inline bool cleancache_fs_enabled(struct page *page)
-{
-       return cleancache_fs_enabled_mapping(page->mapping);
-}
-#else
-#define cleancache_enabled (0)
-#define cleancache_fs_enabled(_page) (0)
-#define cleancache_fs_enabled_mapping(_page) (0)
-#endif
-
-/*
- * The shim layer provided by these inline functions allows the compiler
- * to reduce all cleancache hooks to nothingness if CONFIG_CLEANCACHE
- * is disabled, to a single global variable check if CONFIG_CLEANCACHE
- * is enabled but no cleancache "backend" has dynamically enabled it,
- * and, for the most frequent cleancache ops, to a single global variable
- * check plus a superblock element comparison if CONFIG_CLEANCACHE is enabled
- * and a cleancache backend has dynamically enabled cleancache, but the
- * filesystem referenced by that cleancache op has not enabled cleancache.
- * As a result, CONFIG_CLEANCACHE can be enabled by default with essentially
- * no measurable performance impact.
- */
-
-static inline void cleancache_init_fs(struct super_block *sb)
-{
-       if (cleancache_enabled)
-               __cleancache_init_fs(sb);
-}
-
-static inline void cleancache_init_shared_fs(struct super_block *sb)
-{
-       if (cleancache_enabled)
-               __cleancache_init_shared_fs(sb);
-}
-
-static inline int cleancache_get_page(struct page *page)
-{
-       if (cleancache_enabled && cleancache_fs_enabled(page))
-               return __cleancache_get_page(page);
-       return -1;
-}
-
-static inline void cleancache_put_page(struct page *page)
-{
-       if (cleancache_enabled && cleancache_fs_enabled(page))
-               __cleancache_put_page(page);
-}
-
-static inline void cleancache_invalidate_page(struct address_space *mapping,
-                                       struct page *page)
-{
-       /* careful... page->mapping is NULL sometimes when this is called */
-       if (cleancache_enabled && cleancache_fs_enabled_mapping(mapping))
-               __cleancache_invalidate_page(mapping, page);
-}
-
-static inline void cleancache_invalidate_inode(struct address_space *mapping)
-{
-       if (cleancache_enabled && cleancache_fs_enabled_mapping(mapping))
-               __cleancache_invalidate_inode(mapping);
-}
-
-static inline void cleancache_invalidate_fs(struct super_block *sb)
-{
-       if (cleancache_enabled)
-               __cleancache_invalidate_fs(sb);
-}
-
-#endif /* _LINUX_CLEANCACHE_H */