1 files changed, 122 insertions, 0 deletions

diff --git a/include/linux/cleancache.h b/include/linux/cleancache.h
new file mode 100644
index 000000000000..04ffb2e6c9d0
--- /dev/null
+++ b/include/linux/cleancache.h
@@ -0,0 +1,122 @@
+#ifndef _LINUX_CLEANCACHE_H
+#define _LINUX_CLEANCACHE_H
+
+#include <linux/fs.h>
+#include <linux/exportfs.h>
+#include <linux/mm.h>
+
+#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)(char *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 (*flush_page)(int, struct cleancache_filekey, pgoff_t);
+        void (*flush_inode)(int, struct cleancache_filekey);
+        void (*flush_fs)(int);
+};
+
+extern struct cleancache_ops
+        cleancache_register_ops(struct cleancache_ops *ops);
+extern void __cleancache_init_fs(struct super_block *);
+extern void __cleancache_init_shared_fs(char *, struct super_block *);
+extern int  __cleancache_get_page(struct page *);
+extern void __cleancache_put_page(struct page *);
+extern void __cleancache_flush_page(struct address_space *, struct page *);
+extern void __cleancache_flush_inode(struct address_space *);
+extern void __cleancache_flush_fs(struct super_block *);
+extern int cleancache_enabled;
+
+#ifdef CONFIG_CLEANCACHE
+static inline bool cleancache_fs_enabled(struct page *page)
+{
+        return page->mapping->host->i_sb->cleancache_poolid >= 0;
+}
+static inline bool cleancache_fs_enabled_mapping(struct address_space *mapping)
+{
+        return mapping->host->i_sb->cleancache_poolid >= 0;
+}
+#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(char *uuid, struct super_block *sb)
+{
+        if (cleancache_enabled)
+                __cleancache_init_shared_fs(uuid, sb);
+}
+
+static inline int cleancache_get_page(struct page *page)
+{
+        int ret = -1;
+
+        if (cleancache_enabled && cleancache_fs_enabled(page))
+                ret = __cleancache_get_page(page);
+        return ret;
+}
+
+static inline void cleancache_put_page(struct page *page)
+{
+        if (cleancache_enabled && cleancache_fs_enabled(page))
+                __cleancache_put_page(page);
+}
+
+static inline void cleancache_flush_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_flush_page(mapping, page);
+}
+
+static inline void cleancache_flush_inode(struct address_space *mapping)
+{
+        if (cleancache_enabled && cleancache_fs_enabled_mapping(mapping))
+                __cleancache_flush_inode(mapping);
+}
+
+static inline void cleancache_flush_fs(struct super_block *sb)
+{
+        if (cleancache_enabled)
+                __cleancache_flush_fs(sb);
+}
+
+#endif /* _LINUX_CLEANCACHE_H */