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mirror_zfs/include/linux/mm_compat.h
Brian Behlendorf a55bcaad18 Linux 3.0: Shrinker compatibility 
Update the the wrapper macros for the memory shrinker to handle
this 4th API change.  The callback function now takes a
shrink_control structure.  This is certainly a step in the
right direction but it's annoying to have to accomidate yet
another version of the API.
2011-06-21 14:02:39 -07:00

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/*****************************************************************************\
* 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().
*
* 2.6.39 API compat,
* As for 2.6.39 invalidate_inodes() was updated to take a second
* argument which controls how dirty inodes should be handled.
*/
#ifdef HAVE_INVALIDATE_INODES
# ifdef HAVE_2ARGS_INVALIDATE_INODES
# define spl_invalidate_inodes(sb, kd) invalidate_inodes(sb, kd)
# else
# define spl_invalidate_inodes(sb, kd) invalidate_inodes(sb)
# endif /* HAVE_2ARGS_INVALIDATE_INODES */
#else
# ifdef HAVE_2ARGS_INVALIDATE_INODES
typedef int (*invalidate_inodes_t)(struct super_block *sb, bool kd);
extern invalidate_inodes_t invalidate_inodes_fn;
# define spl_invalidate_inodes(sb, kd) invalidate_inodes_fn(sb, kd)
# else
typedef int (*invalidate_inodes_t)(struct super_block *sb);
extern invalidate_inodes_t invalidate_inodes_fn;
# define spl_invalidate_inodes(sb, kd) invalidate_inodes_fn(sb)
# endif /* HAVE_2ARGS_INVALIDATE_INODES */
#endif /* HAVE_INVALIDATE_INODES */
#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 }; \
shrink_dcache_memory_fn(NULL, &sc); \
})
# 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) shrink_dcache_memory_fn(NULL, nr, gfp)
# 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) shrink_dcache_memory_fn(nr, gfp)
# 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 }; \
shrink_icache_memory_fn(NULL, &sc); \
})
# 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) shrink_icache_memory_fn(NULL, nr, gfp)
# 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) shrink_icache_memory_fn(nr, gfp)
# 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 */
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