255 lines
11 KiB
C
255 lines
11 KiB
C
/*****************************************************************************\
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* Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC.
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* Copyright (C) 2007 The Regents of the University of California.
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* Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
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* Written by Brian Behlendorf <behlendorf1@llnl.gov>.
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* UCRL-CODE-235197
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*
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* This file is part of the SPL, Solaris Porting Layer.
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* For details, see <http://github.com/behlendorf/spl/>.
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*
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* The SPL is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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* The SPL is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with the SPL. If not, see <http://www.gnu.org/licenses/>.
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\*****************************************************************************/
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#ifndef _SPL_MM_COMPAT_H
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#define _SPL_MM_COMPAT_H
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#include <linux/mm.h>
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#include <linux/fs.h>
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/*
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* Linux 2.6.31 API Change.
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* Individual pages_{min,low,high} moved in to watermark array.
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*/
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#ifndef min_wmark_pages
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#define min_wmark_pages(z) (z->pages_min)
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#endif
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#ifndef low_wmark_pages
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#define low_wmark_pages(z) (z->pages_low)
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#endif
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#ifndef high_wmark_pages
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#define high_wmark_pages(z) (z->pages_high)
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#endif
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#if !defined(HAVE_SHRINK_CONTROL_STRUCT)
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struct shrink_control {
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gfp_t gfp_mask;
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unsigned long nr_to_scan;
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};
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#endif /* HAVE_SHRINK_CONTROL_STRUCT */
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/*
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* 2.6.xx API compat,
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* There currently exists no exposed API to partially shrink the dcache.
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* The expected mechanism to shrink the cache is a registered shrinker
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* which is called during memory pressure.
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*/
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#ifndef HAVE_SHRINK_DCACHE_MEMORY
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# if defined(HAVE_SHRINK_CONTROL_STRUCT)
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typedef int (*shrink_dcache_memory_t)(struct shrinker *,
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struct shrink_control *);
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extern shrink_dcache_memory_t shrink_dcache_memory_fn;
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# define shrink_dcache_memory(nr, gfp) \
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({ \
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struct shrink_control sc = { .nr_to_scan = nr, .gfp_mask = gfp }; \
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int __ret__ = 0; \
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\
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if (shrink_dcache_memory_fn) \
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__ret__ = shrink_dcache_memory_fn(NULL, &sc); \
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\
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__ret__; \
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})
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# elif defined(HAVE_3ARGS_SHRINKER_CALLBACK)
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typedef int (*shrink_dcache_memory_t)(struct shrinker *, int, gfp_t);
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extern shrink_dcache_memory_t shrink_dcache_memory_fn;
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# define shrink_dcache_memory(nr, gfp) \
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({ \
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int __ret__ = 0; \
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\
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if (shrink_dcache_memory_fn) \
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__ret__ = shrink_dcache_memory_fn(NULL, nr, gfp); \
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\
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__ret__; \
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})
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# else
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typedef int (*shrink_dcache_memory_t)(int, gfp_t);
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extern shrink_dcache_memory_t shrink_dcache_memory_fn;
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# define shrink_dcache_memory(nr, gfp) \
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({ \
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int __ret__ = 0; \
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\
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if (shrink_dcache_memory_fn) \
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__ret__ = shrink_dcache_memory_fn(nr, gfp); \
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\
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__ret__; \
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})
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# endif /* HAVE_3ARGS_SHRINKER_CALLBACK */
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#endif /* HAVE_SHRINK_DCACHE_MEMORY */
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/*
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* 2.6.xx API compat,
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* There currently exists no exposed API to partially shrink the icache.
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* The expected mechanism to shrink the cache is a registered shrinker
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* which is called during memory pressure.
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*/
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#ifndef HAVE_SHRINK_ICACHE_MEMORY
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# if defined(HAVE_SHRINK_CONTROL_STRUCT)
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typedef int (*shrink_icache_memory_t)(struct shrinker *,
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struct shrink_control *);
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extern shrink_icache_memory_t shrink_icache_memory_fn;
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# define shrink_icache_memory(nr, gfp) \
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({ \
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struct shrink_control sc = { .nr_to_scan = nr, .gfp_mask = gfp }; \
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int __ret__ = 0; \
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\
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if (shrink_icache_memory_fn) \
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__ret__ = shrink_icache_memory_fn(NULL, &sc); \
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\
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__ret__; \
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})
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# elif defined(HAVE_3ARGS_SHRINKER_CALLBACK)
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typedef int (*shrink_icache_memory_t)(struct shrinker *, int, gfp_t);
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extern shrink_icache_memory_t shrink_icache_memory_fn;
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# define shrink_icache_memory(nr, gfp) \
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({ \
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int __ret__ = 0; \
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\
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if (shrink_icache_memory_fn) \
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__ret__ = shrink_icache_memory_fn(NULL, nr, gfp); \
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\
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__ret__; \
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})
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# else
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typedef int (*shrink_icache_memory_t)(int, gfp_t);
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extern shrink_icache_memory_t shrink_icache_memory_fn;
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# define shrink_icache_memory(nr, gfp) \
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({ \
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int __ret__ = 0; \
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\
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if (shrink_icache_memory_fn) \
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__ret__ = shrink_icache_memory_fn(nr, gfp); \
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\
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__ret__; \
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})
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# endif /* HAVE_3ARGS_SHRINKER_CALLBACK */
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#endif /* HAVE_SHRINK_ICACHE_MEMORY */
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/*
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* Linux 2.6. - 2.6. Shrinker API Compatibility.
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*/
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#ifdef HAVE_SET_SHRINKER
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typedef struct spl_shrinker {
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struct shrinker *shrinker;
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shrinker_t fn;
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int seeks;
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} spl_shrinker_t;
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static inline void
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spl_register_shrinker(spl_shrinker_t *ss)
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{
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ss->shrinker = set_shrinker(ss->seeks, ss->fn);
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}
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static inline void
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spl_unregister_shrinker(spl_shrinker_t *ss)
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{
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remove_shrinker(ss->shrinker);
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}
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# define SPL_SHRINKER_DECLARE(s, x, y) \
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static spl_shrinker_t s = { \
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.shrinker = NULL, \
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.fn = x, \
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.seeks = y \
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}
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# define SPL_SHRINKER_CALLBACK_FWD_DECLARE(fn) \
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static int fn(int, unsigned int)
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# define SPL_SHRINKER_CALLBACK_WRAPPER(fn) \
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static int \
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fn(int nr_to_scan, unsigned int gfp_mask) \
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{ \
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struct shrink_control sc; \
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\
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sc.nr_to_scan = nr_to_scan; \
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sc.gfp_mask = gfp_mask; \
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\
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return __ ## fn(NULL, &sc); \
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}
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#else
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# define spl_register_shrinker(x) register_shrinker(x)
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# define spl_unregister_shrinker(x) unregister_shrinker(x)
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# define SPL_SHRINKER_DECLARE(s, x, y) \
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static struct shrinker s = { \
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.shrink = x, \
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.seeks = y \
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}
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/*
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* Linux 2.6. - 2.6. Shrinker API Compatibility.
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*/
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# if defined(HAVE_SHRINK_CONTROL_STRUCT)
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# define SPL_SHRINKER_CALLBACK_FWD_DECLARE(fn) \
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static int fn(struct shrinker *, struct shrink_control *)
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# define SPL_SHRINKER_CALLBACK_WRAPPER(fn) \
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static int \
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fn(struct shrinker *shrink, struct shrink_control *sc) { \
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return __ ## fn(shrink, sc); \
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}
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/*
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* Linux 2.6. - 2.6. Shrinker API Compatibility.
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*/
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# elif defined(HAVE_3ARGS_SHRINKER_CALLBACK)
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# define SPL_SHRINKER_CALLBACK_FWD_DECLARE(fn) \
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static int fn(struct shrinker *, int, unsigned int)
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# define SPL_SHRINKER_CALLBACK_WRAPPER(fn) \
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static int \
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fn(struct shrinker *shrink, int nr_to_scan, unsigned int gfp_mask) \
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{ \
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struct shrink_control sc; \
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\
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sc.nr_to_scan = nr_to_scan; \
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sc.gfp_mask = gfp_mask; \
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\
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return __ ## fn(shrink, &sc); \
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}
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/*
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* Linux 2.6. - 2.6. Shrinker API Compatibility.
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*/
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# else
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# define SPL_SHRINKER_CALLBACK_FWD_DECLARE(fn) \
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static int fn(int, unsigned int)
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# define SPL_SHRINKER_CALLBACK_WRAPPER(fn) \
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static int \
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fn(int nr_to_scan, unsigned int gfp_mask) \
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{ \
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struct shrink_control sc; \
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\
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sc.nr_to_scan = nr_to_scan; \
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sc.gfp_mask = gfp_mask; \
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\
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return __ ## fn(NULL, &sc); \
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}
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# endif
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#endif /* HAVE_SET_SHRINKER */
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#endif /* SPL_MM_COMPAT_H */
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