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The Linux shrinker has gone through three API changes since 2.6.22. Rather than force every caller to understand all three APIs this change consolidates the compatibility code in to the mm-compat.h header. The caller then can then use a single spl provided shrinker API which does the right thing for your kernel. SPL_SHRINKER_CALLBACK_PROTO(shrinker_callback, cb, nr_to_scan, gfp_mask); SPL_SHRINKER_DECLARE(shrinker_struct, shrinker_callback, seeks); spl_register_shrinker(&shrinker_struct); spl_unregister_shrinker(&&shrinker_struct); spl_exec_shrinker(&shrinker_struct, nr_to_scan, gfp_mask);
106 lines
3.4 KiB
C
106 lines
3.4 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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/*
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* 2.6.37 API compat,
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* The function invalidate_inodes() is no longer exported by the kernel.
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* The prototype however is still available which means it is safe
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* to acquire the symbol's address using spl_kallsyms_lookup_name().
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*/
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#ifndef HAVE_INVALIDATE_INODES
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typedef int (*invalidate_inodes_t)(struct super_block *sb);
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extern invalidate_inodes_t invalidate_inodes_fn;
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#define invalidate_inodes(sb) invalidate_inodes_fn(sb)
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#endif /* HAVE_INVALIDATE_INODES */
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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 = { .shrinker = NULL, .fn = x, .seeks = y }
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# define SPL_SHRINKER_CALLBACK_PROTO(fn, x, y, z) \
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static int fn(int y, unsigned int z)
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# define spl_exec_shrinker(ss, nr, gfp) \
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((spl_shrinker_t *)ss)->fn(nr, gfp)
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#else /* HAVE_SET_SHRINKER */
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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 = { .shrink = x, .seeks = y }
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# ifdef HAVE_3ARGS_SHRINKER_CALLBACK
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# define SPL_SHRINKER_CALLBACK_PROTO(fn, x, y, z) \
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static int fn(struct shrinker *x, int y, unsigned int z)
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# define spl_exec_shrinker(ss, nr, gfp) \
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((struct shrinker *)ss)->shrink(NULL, nr, gfp)
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# else /* HAVE_3ARGS_SHRINKER_CALLBACK */
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# define SPL_SHRINKER_CALLBACK_PROTO(fn, x, y, z) \
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static int fn(int y, unsigned int z)
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# define spl_exec_shrinker(ss, nr, gfp) \
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((struct shrinker *)ss)->shrink(nr, gfp)
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# endif /* HAVE_3ARGS_SHRINKER_CALLBACK */
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#endif /* HAVE_SET_SHRINKER */
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#endif /* SPL_MM_COMPAT_H */
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