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957dc1037a
6.7 changes the shrinker API such that shrinkers must be allocated dynamically by the kernel. To accomodate this, this commit reworks spl_register_shrinker() to do something similar against earlier kernels. Reviewed-by: Tony Hutter <hutter2@llnl.gov> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Rob Norris <robn@despairlabs.com> Sponsored-by: https://github.com/sponsors/robn Closes #15681
116 lines
3.4 KiB
C
116 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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*
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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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* Solaris Porting Layer (SPL) Shrinker Implementation.
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*/
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#include <sys/kmem.h>
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#include <sys/shrinker.h>
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#ifdef HAVE_SINGLE_SHRINKER_CALLBACK
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/* 3.0-3.11: single shrink() callback, which we wrap to carry both functions */
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struct spl_shrinker_wrap {
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struct shrinker shrinker;
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spl_shrinker_cb countfunc;
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spl_shrinker_cb scanfunc;
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};
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static int
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spl_shrinker_single_cb(struct shrinker *shrinker, struct shrink_control *sc)
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{
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struct spl_shrinker_wrap *sw = (struct spl_shrinker_wrap *)shrinker;
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if (sc->nr_to_scan != 0)
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(void) sw->scanfunc(&sw->shrinker, sc);
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return (sw->countfunc(&sw->shrinker, sc));
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}
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#endif
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struct shrinker *
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spl_register_shrinker(const char *name, spl_shrinker_cb countfunc,
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spl_shrinker_cb scanfunc, int seek_cost)
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{
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struct shrinker *shrinker;
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/* allocate shrinker */
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#if defined(HAVE_SHRINKER_REGISTER)
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/* 6.7: kernel will allocate the shrinker for us */
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shrinker = shrinker_alloc(0, name);
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#elif defined(HAVE_SPLIT_SHRINKER_CALLBACK)
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/* 3.12-6.6: we allocate the shrinker */
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shrinker = kmem_zalloc(sizeof (struct shrinker), KM_SLEEP);
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#elif defined(HAVE_SINGLE_SHRINKER_CALLBACK)
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/* 3.0-3.11: allocate a wrapper */
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struct spl_shrinker_wrap *sw =
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kmem_zalloc(sizeof (struct spl_shrinker_wrap), KM_SLEEP);
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shrinker = &sw->shrinker;
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#else
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/* 2.x-2.6.22, or a newer shrinker API has been introduced. */
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#error "Unknown shrinker API"
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#endif
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if (shrinker == NULL)
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return (NULL);
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/* set callbacks */
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#ifdef HAVE_SINGLE_SHRINKER_CALLBACK
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sw->countfunc = countfunc;
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sw->scanfunc = scanfunc;
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shrinker->shrink = spl_shrinker_single_cb;
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#else
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shrinker->count_objects = countfunc;
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shrinker->scan_objects = scanfunc;
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#endif
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/* set params */
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shrinker->seeks = seek_cost;
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/* register with kernel */
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#if defined(HAVE_SHRINKER_REGISTER)
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shrinker_register(shrinker);
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#elif defined(HAVE_REGISTER_SHRINKER_VARARG)
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register_shrinker(shrinker, name);
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#else
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register_shrinker(shrinker);
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#endif
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return (shrinker);
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}
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EXPORT_SYMBOL(spl_register_shrinker);
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void
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spl_unregister_shrinker(struct shrinker *shrinker)
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{
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#if defined(HAVE_SHRINKER_REGISTER)
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shrinker_free(shrinker);
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#elif defined(HAVE_SPLIT_SHRINKER_CALLBACK)
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unregister_shrinker(shrinker);
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kmem_free(shrinker, sizeof (struct shrinker));
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#elif defined(HAVE_SINGLE_SHRINKER_CALLBACK)
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unregister_shrinker(shrinker);
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kmem_free(shrinker, sizeof (struct spl_shrinker_wrap));
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#else
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#error "Unknown shrinker API"
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#endif
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}
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EXPORT_SYMBOL(spl_unregister_shrinker);
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