91c6cc9b5c
Complete the renaming from "flush" to "invalidate" across both tmem frontends (cleancache and frontswap) and both tmem backends (Xen and zcache), as required by akpm. This change is completely cosmetic. [v10: no change] [v9: akpm@linux-foundation.org: change "flush" to "invalidate", part 3] Signed-off-by: Dan Magenheimer <dan.magenheimer@oracle.com> Cc: Kamezawa Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Jan Beulich <JBeulich@novell.com> Acked-by: Seth Jennings <sjenning@linux.vnet.ibm.com> Cc: Jeremy Fitzhardinge <jeremy@goop.org> Cc: Hugh Dickins <hughd@google.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Nitin Gupta <ngupta@vflare.org> Cc: Matthew Wilcox <matthew@wil.cx> Cc: Chris Mason <chris.mason@oracle.com> Cc: Rik Riel <riel@redhat.com> Cc: Andrew Morton <akpm@linux-foundation.org> [v11: Remove the frontswap part] Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
123 lines
3.8 KiB
C
123 lines
3.8 KiB
C
#ifndef _LINUX_CLEANCACHE_H
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#define _LINUX_CLEANCACHE_H
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#include <linux/fs.h>
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#include <linux/exportfs.h>
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#include <linux/mm.h>
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#define CLEANCACHE_KEY_MAX 6
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/*
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* cleancache requires every file with a page in cleancache to have a
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* unique key unless/until the file is removed/truncated. For some
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* filesystems, the inode number is unique, but for "modern" filesystems
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* an exportable filehandle is required (see exportfs.h)
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*/
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struct cleancache_filekey {
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union {
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ino_t ino;
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__u32 fh[CLEANCACHE_KEY_MAX];
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u32 key[CLEANCACHE_KEY_MAX];
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} u;
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};
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struct cleancache_ops {
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int (*init_fs)(size_t);
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int (*init_shared_fs)(char *uuid, size_t);
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int (*get_page)(int, struct cleancache_filekey,
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pgoff_t, struct page *);
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void (*put_page)(int, struct cleancache_filekey,
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pgoff_t, struct page *);
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void (*invalidate_page)(int, struct cleancache_filekey, pgoff_t);
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void (*invalidate_inode)(int, struct cleancache_filekey);
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void (*invalidate_fs)(int);
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};
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extern struct cleancache_ops
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cleancache_register_ops(struct cleancache_ops *ops);
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extern void __cleancache_init_fs(struct super_block *);
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extern void __cleancache_init_shared_fs(char *, struct super_block *);
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extern int __cleancache_get_page(struct page *);
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extern void __cleancache_put_page(struct page *);
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extern void __cleancache_invalidate_page(struct address_space *, struct page *);
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extern void __cleancache_invalidate_inode(struct address_space *);
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extern void __cleancache_invalidate_fs(struct super_block *);
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extern int cleancache_enabled;
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#ifdef CONFIG_CLEANCACHE
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static inline bool cleancache_fs_enabled(struct page *page)
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{
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return page->mapping->host->i_sb->cleancache_poolid >= 0;
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}
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static inline bool cleancache_fs_enabled_mapping(struct address_space *mapping)
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{
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return mapping->host->i_sb->cleancache_poolid >= 0;
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}
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#else
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#define cleancache_enabled (0)
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#define cleancache_fs_enabled(_page) (0)
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#define cleancache_fs_enabled_mapping(_page) (0)
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#endif
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/*
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* The shim layer provided by these inline functions allows the compiler
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* to reduce all cleancache hooks to nothingness if CONFIG_CLEANCACHE
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* is disabled, to a single global variable check if CONFIG_CLEANCACHE
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* is enabled but no cleancache "backend" has dynamically enabled it,
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* and, for the most frequent cleancache ops, to a single global variable
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* check plus a superblock element comparison if CONFIG_CLEANCACHE is enabled
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* and a cleancache backend has dynamically enabled cleancache, but the
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* filesystem referenced by that cleancache op has not enabled cleancache.
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* As a result, CONFIG_CLEANCACHE can be enabled by default with essentially
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* no measurable performance impact.
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*/
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static inline void cleancache_init_fs(struct super_block *sb)
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{
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if (cleancache_enabled)
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__cleancache_init_fs(sb);
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}
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static inline void cleancache_init_shared_fs(char *uuid, struct super_block *sb)
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{
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if (cleancache_enabled)
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__cleancache_init_shared_fs(uuid, sb);
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}
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static inline int cleancache_get_page(struct page *page)
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{
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int ret = -1;
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if (cleancache_enabled && cleancache_fs_enabled(page))
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ret = __cleancache_get_page(page);
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return ret;
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}
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static inline void cleancache_put_page(struct page *page)
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{
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if (cleancache_enabled && cleancache_fs_enabled(page))
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__cleancache_put_page(page);
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}
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static inline void cleancache_invalidate_page(struct address_space *mapping,
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struct page *page)
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{
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/* careful... page->mapping is NULL sometimes when this is called */
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if (cleancache_enabled && cleancache_fs_enabled_mapping(mapping))
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__cleancache_invalidate_page(mapping, page);
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}
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static inline void cleancache_invalidate_inode(struct address_space *mapping)
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{
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if (cleancache_enabled && cleancache_fs_enabled_mapping(mapping))
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__cleancache_invalidate_inode(mapping);
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}
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static inline void cleancache_invalidate_fs(struct super_block *sb)
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{
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if (cleancache_enabled)
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__cleancache_invalidate_fs(sb);
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}
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#endif /* _LINUX_CLEANCACHE_H */
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