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Commit ff610a1d authored by Bob Liu's avatar Bob Liu Committed by Linus Torvalds
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mm: cleancache: clean up cleancache_enabled 



cleancache_ops is used to decide whether backend is registered.
So now cleancache_enabled is always true if defined CONFIG_CLEANCACHE.

Signed-off-by: default avatarBob Liu <lliubbo@gmail.com>
Cc: Wanpeng Li <liwanp@linux.vnet.ibm.com>
Cc: Andor Daam <andor.daam@googlemail.com>
Cc: Dan Magenheimer <dan.magenheimer@oracle.com>
Cc: Florian Schmaus <fschmaus@gmail.com>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Stefan Hengelein <ilendir@googlemail.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 833f8662

include/linux/cleancache.h

+1 −1
Original line number Diff line number Diff line
@@ -42,9 +42,9 @@ 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 *);

extern int cleancache_enabled;



#ifdef CONFIG_CLEANCACHE

#define cleancache_enabled (1)

static inline bool cleancache_fs_enabled(struct page *page)

{

	return page->mapping->host->i_sb->cleancache_poolid >= 0;

mm/cleancache.c

+0 −11
Original line number Diff line number Diff line
@@ -18,16 +18,6 @@ 
#include <linux/debugfs.h>

#include <linux/cleancache.h>



/*

 * This global enablement flag may be read thousands of times per second

 * by cleancache_get/put/invalidate even on systems where cleancache_ops

 * is not claimed (e.g. cleancache is config'ed on but remains

 * disabled), so is preferred to the slower alternative: a function

 * call that checks a non-global.

 */

int cleancache_enabled __read_mostly;

EXPORT_SYMBOL(cleancache_enabled);



/*

 * cleancache_ops is set by cleancache_ops_register to contain the pointers

 * to the cleancache "backend" implementation functions.
@@ -414,7 +404,6 @@ static int __init init_cleancache(void) 
		fs_poolid_map[i] = FS_UNKNOWN;

		shared_fs_poolid_map[i] = FS_UNKNOWN;

	}

	cleancache_enabled = 1;

	return 0;

}

module_init(init_cleancache)