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Файловый менеджер - Редактировать - /usr/src/linux-headers-5.4.0-200/include/linux/cleancache.h

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/* 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 */

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