[mirror_zfs.git] / include / linux / mm_compat.h

/*****************************************************************************\
 *  Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC.
 *  Copyright (C) 2007 The Regents of the University of California.
 *  Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
 *  Written by Brian Behlendorf <behlendorf1@llnl.gov>.
 *  UCRL-CODE-235197
 *
 *  This file is part of the SPL, Solaris Porting Layer.
 *  For details, see <http://github.com/behlendorf/spl/>.
 *
 *  The SPL is free software; you can redistribute it and/or modify it
 *  under the terms of the GNU General Public License as published by the
 *  Free Software Foundation; either version 2 of the License, or (at your
 *  option) any later version.
 *
 *  The SPL is distributed in the hope that it will be useful, but WITHOUT
 *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 *  for more details.
 *
 *  You should have received a copy of the GNU General Public License along
 *  with the SPL.  If not, see <http://www.gnu.org/licenses/>.
\*****************************************************************************/

#ifndef _SPL_MM_COMPAT_H
#define _SPL_MM_COMPAT_H

#include <linux/mm.h>
#include <linux/fs.h>

/*
 * Linux 2.6.31 API Change.
 * Individual pages_{min,low,high} moved in to watermark array.
 */
#ifndef min_wmark_pages
#define min_wmark_pages(z)	(z->pages_min)
#endif

#ifndef low_wmark_pages
#define low_wmark_pages(z)	(z->pages_low)
#endif

#ifndef high_wmark_pages
#define high_wmark_pages(z)	(z->pages_high)
#endif

/*
 * 2.6.37 API compat,
 * The function invalidate_inodes() is no longer exported by the kernel.
 * The prototype however is still available which means it is safe
 * to acquire the symbol's address using spl_kallsyms_lookup_name().
 */
#ifndef HAVE_INVALIDATE_INODES
typedef int (*invalidate_inodes_t)(struct super_block *sb);
extern invalidate_inodes_t invalidate_inodes_fn;
#define invalidate_inodes(sb)	invalidate_inodes_fn(sb)
#endif /* HAVE_INVALIDATE_INODES */

#ifdef HAVE_SET_SHRINKER
typedef struct spl_shrinker {
	struct shrinker *shrinker;
	shrinker_t fn;
	int seeks;
} spl_shrinker_t;

static inline void
spl_register_shrinker(spl_shrinker_t *ss)
{
	ss->shrinker = set_shrinker(ss->seeks, ss->fn);
}

static inline void
spl_unregister_shrinker(spl_shrinker_t *ss)
{
	remove_shrinker(ss->shrinker);
}

# define SPL_SHRINKER_DECLARE(s, x, y) \
	static spl_shrinker_t s = { .shrinker = NULL, .fn = x, .seeks = y }
# define SPL_SHRINKER_CALLBACK_PROTO(fn, x, y, z) \
	static int fn(int y, unsigned int z)
# define spl_exec_shrinker(ss, nr, gfp) \
	((spl_shrinker_t *)ss)->fn(nr, gfp)

#else /* HAVE_SET_SHRINKER */

# define spl_register_shrinker(x)	register_shrinker(x)
# define spl_unregister_shrinker(x)	unregister_shrinker(x)
# define SPL_SHRINKER_DECLARE(s, x, y) \
	static struct shrinker s = { .shrink = x, .seeks = y }

# ifdef HAVE_3ARGS_SHRINKER_CALLBACK
#  define SPL_SHRINKER_CALLBACK_PROTO(fn, x, y, z) \
	static int fn(struct shrinker *x, int y, unsigned int z)
#  define spl_exec_shrinker(ss, nr, gfp) \
	((struct shrinker *)ss)->shrink(NULL, nr, gfp)
# else /* HAVE_3ARGS_SHRINKER_CALLBACK */
#  define SPL_SHRINKER_CALLBACK_PROTO(fn, x, y, z) \
	static int fn(int y, unsigned int z)
#  define spl_exec_shrinker(ss, nr, gfp) \
	((struct shrinker *)ss)->shrink(nr, gfp)
# endif /* HAVE_3ARGS_SHRINKER_CALLBACK */
#endif /* HAVE_SET_SHRINKER */

#endif /* SPL_MM_COMPAT_H */
Commit	Line	Data
716154c5 BB	1	/*****************************************************************************\
	2	* Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC.
	3	* Copyright (C) 2007 The Regents of the University of California.
	4	* Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
	5	* Written by Brian Behlendorf <behlendorf1@llnl.gov>.
	6	* UCRL-CODE-235197
	7	*
	8	* This file is part of the SPL, Solaris Porting Layer.
	9	* For details, see <http://github.com/behlendorf/spl/>.
	10	*
	11	* The SPL is free software; you can redistribute it and/or modify it
	12	* under the terms of the GNU General Public License as published by the
	13	* Free Software Foundation; either version 2 of the License, or (at your
	14	* option) any later version.
	15	*
	16	* The SPL is distributed in the hope that it will be useful, but WITHOUT
	17	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	18	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
	19	* for more details.
	20	*
	21	* You should have received a copy of the GNU General Public License along
	22	* with the SPL. If not, see <http://www.gnu.org/licenses/>.
	23	\*****************************************************************************/
	24
baf2979e BB	25	#ifndef _SPL_MM_COMPAT_H
	26	#define _SPL_MM_COMPAT_H
	27
	28	#include <linux/mm.h>
914b0631	29	#include <linux/fs.h>
baf2979e BB	30
	31	/*
	32	* Linux 2.6.31 API Change.
	33	* Individual pages_{min,low,high} moved in to watermark array.
	34	*/
	35	#ifndef min_wmark_pages
	36	#define min_wmark_pages(z) (z->pages_min)
	37	#endif
	38
	39	#ifndef low_wmark_pages
	40	#define low_wmark_pages(z) (z->pages_low)
	41	#endif
	42
	43	#ifndef high_wmark_pages
	44	#define high_wmark_pages(z) (z->pages_high)
	45	#endif
	46
914b0631 BB	47	/*
	48	* 2.6.37 API compat,
	49	* The function invalidate_inodes() is no longer exported by the kernel.
	50	* The prototype however is still available which means it is safe
	51	* to acquire the symbol's address using spl_kallsyms_lookup_name().
	52	*/
	53	#ifndef HAVE_INVALIDATE_INODES
	54	typedef int (invalidate_inodes_t)(struct super_block sb);
	55	extern invalidate_inodes_t invalidate_inodes_fn;
	56	#define invalidate_inodes(sb) invalidate_inodes_fn(sb)
	57	#endif /* HAVE_INVALIDATE_INODES */
	58
495bd532 BB	59	#ifdef HAVE_SET_SHRINKER
	60	typedef struct spl_shrinker {
	61	struct shrinker *shrinker;
	62	shrinker_t fn;
	63	int seeks;
	64	} spl_shrinker_t;
	65
	66	static inline void
	67	spl_register_shrinker(spl_shrinker_t *ss)
	68	{
	69	ss->shrinker = set_shrinker(ss->seeks, ss->fn);
	70	}
	71
	72	static inline void
	73	spl_unregister_shrinker(spl_shrinker_t *ss)
	74	{
	75	remove_shrinker(ss->shrinker);
	76	}
	77
	78	# define SPL_SHRINKER_DECLARE(s, x, y) \
	79	static spl_shrinker_t s = { .shrinker = NULL, .fn = x, .seeks = y }
	80	# define SPL_SHRINKER_CALLBACK_PROTO(fn, x, y, z) \
	81	static int fn(int y, unsigned int z)
	82	# define spl_exec_shrinker(ss, nr, gfp) \
	83	((spl_shrinker_t *)ss)->fn(nr, gfp)
	84
	85	#else /* HAVE_SET_SHRINKER */
	86
	87	# define spl_register_shrinker(x) register_shrinker(x)
	88	# define spl_unregister_shrinker(x) unregister_shrinker(x)
	89	# define SPL_SHRINKER_DECLARE(s, x, y) \
	90	static struct shrinker s = { .shrink = x, .seeks = y }
	91
	92	# ifdef HAVE_3ARGS_SHRINKER_CALLBACK
	93	# define SPL_SHRINKER_CALLBACK_PROTO(fn, x, y, z) \
	94	static int fn(struct shrinker *x, int y, unsigned int z)
	95	# define spl_exec_shrinker(ss, nr, gfp) \
	96	((struct shrinker *)ss)->shrink(NULL, nr, gfp)
	97	# else /* HAVE_3ARGS_SHRINKER_CALLBACK */
	98	# define SPL_SHRINKER_CALLBACK_PROTO(fn, x, y, z) \
	99	static int fn(int y, unsigned int z)
	100	# define spl_exec_shrinker(ss, nr, gfp) \
	101	((struct shrinker *)ss)->shrink(nr, gfp)
	102	# endif /* HAVE_3ARGS_SHRINKER_CALLBACK */
	103	#endif /* HAVE_SET_SHRINKER */
	104
baf2979e	105	#endif /* SPL_MM_COMPAT_H */