[mirror_spl.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

#if !defined(HAVE_SHRINK_CONTROL_STRUCT)
struct shrink_control {
	gfp_t gfp_mask;
	unsigned long nr_to_scan;
};
#endif /* HAVE_SHRINK_CONTROL_STRUCT */

/*
 * 2.6.xx API compat,
 * There currently exists no exposed API to partially shrink the dcache.
 * The expected mechanism to shrink the cache is a registered shrinker
 * which is called during memory pressure.
 */
#ifndef HAVE_SHRINK_DCACHE_MEMORY
# if defined(HAVE_SHRINK_CONTROL_STRUCT)
typedef int (*shrink_dcache_memory_t)(struct shrinker *,
    struct shrink_control *);
extern shrink_dcache_memory_t shrink_dcache_memory_fn;
#  define shrink_dcache_memory(nr, gfp)                                      \
({                                                                           \
	struct shrink_control sc = { .nr_to_scan = nr, .gfp_mask = gfp };    \
	int __ret__ = 0;                                                     \
                                                                             \
	if (shrink_dcache_memory_fn)                                         \
		__ret__ = shrink_dcache_memory_fn(NULL, &sc);                \
                                                                             \
	__ret__;                                                             \
})
# elif defined(HAVE_3ARGS_SHRINKER_CALLBACK)
typedef int (*shrink_dcache_memory_t)(struct shrinker *, int, gfp_t);
extern shrink_dcache_memory_t shrink_dcache_memory_fn;
#  define shrink_dcache_memory(nr, gfp)                                      \
({                                                                           \
	int __ret__ = 0;                                                     \
                                                                             \
	if (shrink_dcache_memory_fn)                                         \
		__ret__ = shrink_dcache_memory_fn(NULL, nr, gfp);            \
                                                                             \
	__ret__;                                                             \
})
# else
typedef int (*shrink_dcache_memory_t)(int, gfp_t);
extern shrink_dcache_memory_t shrink_dcache_memory_fn;
#  define shrink_dcache_memory(nr, gfp)                                      \
({                                                                           \
	int __ret__ = 0;                                                     \
                                                                             \
	if (shrink_dcache_memory_fn)                                         \
		__ret__ = shrink_dcache_memory_fn(nr, gfp);                  \
                                                                             \
	__ret__;                                                             \
})
# endif /* HAVE_3ARGS_SHRINKER_CALLBACK */
#endif /* HAVE_SHRINK_DCACHE_MEMORY */

/*
 * 2.6.xx API compat,
 * There currently exists no exposed API to partially shrink the icache.
 * The expected mechanism to shrink the cache is a registered shrinker
 * which is called during memory pressure.
 */
#ifndef HAVE_SHRINK_ICACHE_MEMORY
# if defined(HAVE_SHRINK_CONTROL_STRUCT)
typedef int (*shrink_icache_memory_t)(struct shrinker *,
    struct shrink_control *);
extern shrink_icache_memory_t shrink_icache_memory_fn;
#  define shrink_icache_memory(nr, gfp)                                      \
({                                                                           \
	struct shrink_control sc = { .nr_to_scan = nr, .gfp_mask = gfp };    \
	int __ret__ = 0;                                                     \
                                                                             \
	if (shrink_icache_memory_fn)                                         \
		__ret__ = shrink_icache_memory_fn(NULL, &sc);                \
                                                                             \
	__ret__;                                                             \
})
# elif defined(HAVE_3ARGS_SHRINKER_CALLBACK)
typedef int (*shrink_icache_memory_t)(struct shrinker *, int, gfp_t);
extern shrink_icache_memory_t shrink_icache_memory_fn;
#  define shrink_icache_memory(nr, gfp)                                      \
({                                                                           \
	int __ret__ = 0;                                                     \
                                                                             \
	if (shrink_icache_memory_fn)                                         \
		__ret__ = shrink_icache_memory_fn(NULL, nr, gfp);            \
                                                                             \
	__ret__;                                                             \
})
# else
typedef int (*shrink_icache_memory_t)(int, gfp_t);
extern shrink_icache_memory_t shrink_icache_memory_fn;
#  define shrink_icache_memory(nr, gfp)                                      \
({                                                                           \
	int __ret__ = 0;                                                     \
                                                                             \
	if (shrink_icache_memory_fn)                                         \
		__ret__ = shrink_icache_memory_fn(nr, gfp);                  \
                                                                             \
	__ret__;                                                             \
})
# endif /* HAVE_3ARGS_SHRINKER_CALLBACK */
#endif /* HAVE_SHRINK_ICACHE_MEMORY */

/*
 * Linux 2.6. - 2.6. Shrinker API Compatibility.
 */
#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_FWD_DECLARE(fn)                         \
	static int fn(int, unsigned int)
# define SPL_SHRINKER_CALLBACK_WRAPPER(fn)                             \
static int                                                             \
fn(int nr_to_scan, unsigned int gfp_mask)                              \
{                                                                      \
	struct shrink_control sc;                                      \
                                                                       \
        sc.nr_to_scan = nr_to_scan;                                    \
        sc.gfp_mask = gfp_mask;                                        \
                                                                       \
	return __ ## fn(NULL, &sc);                                    \
}

#else

# 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                                             \
	}

/*
 * Linux 2.6. - 2.6. Shrinker API Compatibility.
 */
# if defined(HAVE_SHRINK_CONTROL_STRUCT)
#  define SPL_SHRINKER_CALLBACK_FWD_DECLARE(fn)                        \
	static int fn(struct shrinker *, struct shrink_control *)
#  define SPL_SHRINKER_CALLBACK_WRAPPER(fn)                            \
static int                                                             \
fn(struct shrinker *shrink, struct shrink_control *sc) {               \
	return __ ## fn(shrink, sc);                                   \
}

/*
 * Linux 2.6. - 2.6. Shrinker API Compatibility.
 */
# elif defined(HAVE_3ARGS_SHRINKER_CALLBACK)
#  define SPL_SHRINKER_CALLBACK_FWD_DECLARE(fn)                       \
	static int fn(struct shrinker *, int, unsigned int)
#  define SPL_SHRINKER_CALLBACK_WRAPPER(fn)                           \
static int                                                            \
fn(struct shrinker *shrink, int nr_to_scan, unsigned int gfp_mask)    \
{                                                                     \
	struct shrink_control sc;                                     \
                                                                      \
        sc.nr_to_scan = nr_to_scan;                                   \
        sc.gfp_mask = gfp_mask;                                       \
                                                                      \
	return __ ## fn(shrink, &sc);                                 \
}

/*
 * Linux 2.6. - 2.6. Shrinker API Compatibility.
 */
# else
#  define SPL_SHRINKER_CALLBACK_FWD_DECLARE(fn)                       \
	static int fn(int, unsigned int)
#  define SPL_SHRINKER_CALLBACK_WRAPPER(fn)                           \
static int                                                            \
fn(int nr_to_scan, unsigned int gfp_mask)                             \
{                                                                     \
	struct shrink_control sc;                                     \
                                                                      \
        sc.nr_to_scan = nr_to_scan;                                   \
        sc.gfp_mask = gfp_mask;                                       \
                                                                      \
	return __ ## fn(NULL, &sc);                                   \
}

# endif
#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
a55bcaad BB	47	#if !defined(HAVE_SHRINK_CONTROL_STRUCT)
	48	struct shrink_control {
	49	gfp_t gfp_mask;
	50	unsigned long nr_to_scan;
	51	};
	52	#endif /* HAVE_SHRINK_CONTROL_STRUCT */
	53
e76f4bf1 BB	54	/*
	55	* 2.6.xx API compat,
	56	* There currently exists no exposed API to partially shrink the dcache.
	57	* The expected mechanism to shrink the cache is a registered shrinker
	58	* which is called during memory pressure.
	59	*/
	60	#ifndef HAVE_SHRINK_DCACHE_MEMORY
a55bcaad BB	61	# if defined(HAVE_SHRINK_CONTROL_STRUCT)
	62	typedef int (shrink_dcache_memory_t)(struct shrinker ,
	63	struct shrink_control *);
	64	extern shrink_dcache_memory_t shrink_dcache_memory_fn;
	65	# define shrink_dcache_memory(nr, gfp) \
	66	({ \
	67	struct shrink_control sc = { .nr_to_scan = nr, .gfp_mask = gfp }; \
fe71c0e5 BB	68	int __ret__ = 0; \
	69	\
	70	if (shrink_dcache_memory_fn) \
	71	__ret__ = shrink_dcache_memory_fn(NULL, &sc); \
	72	\
	73	__ret__; \
a55bcaad BB	74	})
a55bcaad BB	75	# elif defined(HAVE_3ARGS_SHRINKER_CALLBACK)
e76f4bf1 BB	76	typedef int (shrink_dcache_memory_t)(struct shrinker , int, gfp_t);
e76f4bf1 BB	77	extern shrink_dcache_memory_t shrink_dcache_memory_fn;
fe71c0e5 BB	78	# define shrink_dcache_memory(nr, gfp) \
	79	({ \
	80	int __ret__ = 0; \
	81	\
	82	if (shrink_dcache_memory_fn) \
	83	__ret__ = shrink_dcache_memory_fn(NULL, nr, gfp); \
	84	\
	85	__ret__; \
	86	})
e76f4bf1 BB	87	# else
	88	typedef int (*shrink_dcache_memory_t)(int, gfp_t);
	89	extern shrink_dcache_memory_t shrink_dcache_memory_fn;
fe71c0e5 BB	90	# define shrink_dcache_memory(nr, gfp) \
	91	({ \
	92	int __ret__ = 0; \
	93	\
	94	if (shrink_dcache_memory_fn) \
	95	__ret__ = shrink_dcache_memory_fn(nr, gfp); \
	96	\
	97	__ret__; \
	98	})
e76f4bf1 BB	99	# endif /* HAVE_3ARGS_SHRINKER_CALLBACK */
	100	#endif /* HAVE_SHRINK_DCACHE_MEMORY */
	101
	102	/*
	103	* 2.6.xx API compat,
	104	* There currently exists no exposed API to partially shrink the icache.
	105	* The expected mechanism to shrink the cache is a registered shrinker
	106	* which is called during memory pressure.
	107	*/
	108	#ifndef HAVE_SHRINK_ICACHE_MEMORY
a55bcaad BB	109	# if defined(HAVE_SHRINK_CONTROL_STRUCT)
	110	typedef int (shrink_icache_memory_t)(struct shrinker ,
	111	struct shrink_control *);
	112	extern shrink_icache_memory_t shrink_icache_memory_fn;
	113	# define shrink_icache_memory(nr, gfp) \
	114	({ \
	115	struct shrink_control sc = { .nr_to_scan = nr, .gfp_mask = gfp }; \
fe71c0e5 BB	116	int __ret__ = 0; \
	117	\
	118	if (shrink_icache_memory_fn) \
	119	__ret__ = shrink_icache_memory_fn(NULL, &sc); \
	120	\
	121	__ret__; \
a55bcaad BB	122	})
a55bcaad BB	123	# elif defined(HAVE_3ARGS_SHRINKER_CALLBACK)
e76f4bf1 BB	124	typedef int (shrink_icache_memory_t)(struct shrinker , int, gfp_t);
e76f4bf1 BB	125	extern shrink_icache_memory_t shrink_icache_memory_fn;
fe71c0e5 BB	126	# define shrink_icache_memory(nr, gfp) \
	127	({ \
	128	int __ret__ = 0; \
	129	\
	130	if (shrink_icache_memory_fn) \
	131	__ret__ = shrink_icache_memory_fn(NULL, nr, gfp); \
	132	\
	133	__ret__; \
	134	})
e76f4bf1 BB	135	# else
	136	typedef int (*shrink_icache_memory_t)(int, gfp_t);
	137	extern shrink_icache_memory_t shrink_icache_memory_fn;
fe71c0e5 BB	138	# define shrink_icache_memory(nr, gfp) \
	139	({ \
	140	int __ret__ = 0; \
	141	\
	142	if (shrink_icache_memory_fn) \
	143	__ret__ = shrink_icache_memory_fn(nr, gfp); \
	144	\
	145	__ret__; \
	146	})
e76f4bf1 BB	147	# endif /* HAVE_3ARGS_SHRINKER_CALLBACK */
	148	#endif /* HAVE_SHRINK_ICACHE_MEMORY */
	149
a55bcaad BB	150	/*
	151	* Linux 2.6. - 2.6. Shrinker API Compatibility.
	152	*/
495bd532 BB	153	#ifdef HAVE_SET_SHRINKER
	154	typedef struct spl_shrinker {
	155	struct shrinker *shrinker;
	156	shrinker_t fn;
	157	int seeks;
	158	} spl_shrinker_t;
	159
	160	static inline void
	161	spl_register_shrinker(spl_shrinker_t *ss)
	162	{
	163	ss->shrinker = set_shrinker(ss->seeks, ss->fn);
	164	}
	165
	166	static inline void
	167	spl_unregister_shrinker(spl_shrinker_t *ss)
	168	{
	169	remove_shrinker(ss->shrinker);
	170	}
	171
a55bcaad BB	172	# define SPL_SHRINKER_DECLARE(s, x, y) \
	173	static spl_shrinker_t s = { \
	174	.shrinker = NULL, \
	175	.fn = x, \
	176	.seeks = y \
	177	}
	178
	179	# define SPL_SHRINKER_CALLBACK_FWD_DECLARE(fn) \
	180	static int fn(int, unsigned int)
	181	# define SPL_SHRINKER_CALLBACK_WRAPPER(fn) \
	182	static int \
	183	fn(int nr_to_scan, unsigned int gfp_mask) \
	184	{ \
	185	struct shrink_control sc; \
	186	\
	187	sc.nr_to_scan = nr_to_scan; \
	188	sc.gfp_mask = gfp_mask; \
	189	\
	190	return __ ## fn(NULL, &sc); \
	191	}
495bd532	192
a55bcaad	193	#else
495bd532 BB	194
	195	# define spl_register_shrinker(x) register_shrinker(x)
	196	# define spl_unregister_shrinker(x) unregister_shrinker(x)
a55bcaad BB	197	# define SPL_SHRINKER_DECLARE(s, x, y) \
	198	static struct shrinker s = { \
	199	.shrink = x, \
	200	.seeks = y \
	201	}
	202
	203	/*
	204	* Linux 2.6. - 2.6. Shrinker API Compatibility.
	205	*/
	206	# if defined(HAVE_SHRINK_CONTROL_STRUCT)
	207	# define SPL_SHRINKER_CALLBACK_FWD_DECLARE(fn) \
	208	static int fn(struct shrinker , struct shrink_control )
	209	# define SPL_SHRINKER_CALLBACK_WRAPPER(fn) \
	210	static int \
	211	fn(struct shrinker shrink, struct shrink_control sc) { \
	212	return __ ## fn(shrink, sc); \
	213	}
	214
	215	/*
	216	* Linux 2.6. - 2.6. Shrinker API Compatibility.
	217	*/
	218	# elif defined(HAVE_3ARGS_SHRINKER_CALLBACK)
	219	# define SPL_SHRINKER_CALLBACK_FWD_DECLARE(fn) \
	220	static int fn(struct shrinker *, int, unsigned int)
	221	# define SPL_SHRINKER_CALLBACK_WRAPPER(fn) \
	222	static int \
	223	fn(struct shrinker *shrink, int nr_to_scan, unsigned int gfp_mask) \
	224	{ \
	225	struct shrink_control sc; \
	226	\
	227	sc.nr_to_scan = nr_to_scan; \
	228	sc.gfp_mask = gfp_mask; \
	229	\
	230	return __ ## fn(shrink, &sc); \
	231	}
	232
	233	/*
	234	* Linux 2.6. - 2.6. Shrinker API Compatibility.
	235	*/
	236	# else
	237	# define SPL_SHRINKER_CALLBACK_FWD_DECLARE(fn) \
	238	static int fn(int, unsigned int)
	239	# define SPL_SHRINKER_CALLBACK_WRAPPER(fn) \
	240	static int \
	241	fn(int nr_to_scan, unsigned int gfp_mask) \
	242	{ \
	243	struct shrink_control sc; \
	244	\
	245	sc.nr_to_scan = nr_to_scan; \
	246	sc.gfp_mask = gfp_mask; \
	247	\
	248	return __ ## fn(NULL, &sc); \
	249	}
	250
	251	# endif
495bd532 BB	252	#endif /* HAVE_SET_SHRINKER */
495bd532 BB	253
baf2979e	254	#endif /* SPL_MM_COMPAT_H */