mirror of
https://git.proxmox.com/git/mirror_zfs.git
synced 2024-12-28 03:49:38 +03:00
03b84099d9
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. Signed-off-by: Rob Norris <robn@despairlabs.com> Sponsored-by: https://github.com/sponsors/robn
116 lines
3.4 KiB
C
116 lines
3.4 KiB
C
/*
|
|
* 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.
|
|
*
|
|
* 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/>.
|
|
*
|
|
* Solaris Porting Layer (SPL) Shrinker Implementation.
|
|
*/
|
|
|
|
#include <sys/kmem.h>
|
|
#include <sys/shrinker.h>
|
|
|
|
#ifdef HAVE_SINGLE_SHRINKER_CALLBACK
|
|
/* 3.0-3.11: single shrink() callback, which we wrap to carry both functions */
|
|
struct spl_shrinker_wrap {
|
|
struct shrinker shrinker;
|
|
spl_shrinker_cb countfunc;
|
|
spl_shrinker_cb scanfunc;
|
|
};
|
|
|
|
static int
|
|
spl_shrinker_single_cb(struct shrinker *shrinker, struct shrink_control *sc)
|
|
{
|
|
struct spl_shrinker_wrap *sw = (struct spl_shrinker_wrap *)shrinker;
|
|
|
|
if (sc->nr_to_scan != 0)
|
|
(void) sw->scanfunc(&sw->shrinker, sc);
|
|
return (sw->countfunc(&sw->shrinker, sc));
|
|
}
|
|
#endif
|
|
|
|
struct shrinker *
|
|
spl_register_shrinker(const char *name, spl_shrinker_cb countfunc,
|
|
spl_shrinker_cb scanfunc, int seek_cost)
|
|
{
|
|
struct shrinker *shrinker;
|
|
|
|
/* allocate shrinker */
|
|
#if defined(HAVE_SHRINKER_REGISTER)
|
|
/* 6.7: kernel will allocate the shrinker for us */
|
|
shrinker = shrinker_alloc(0, name);
|
|
#elif defined(HAVE_SPLIT_SHRINKER_CALLBACK)
|
|
/* 3.12-6.6: we allocate the shrinker */
|
|
shrinker = kmem_zalloc(sizeof (struct shrinker), KM_SLEEP);
|
|
#elif defined(HAVE_SINGLE_SHRINKER_CALLBACK)
|
|
/* 3.0-3.11: allocate a wrapper */
|
|
struct spl_shrinker_wrap *sw =
|
|
kmem_zalloc(sizeof (struct spl_shrinker_wrap), KM_SLEEP);
|
|
shrinker = &sw->shrinker;
|
|
#else
|
|
/* 2.x-2.6.22, or a newer shrinker API has been introduced. */
|
|
#error "Unknown shrinker API"
|
|
#endif
|
|
|
|
if (shrinker == NULL)
|
|
return (NULL);
|
|
|
|
/* set callbacks */
|
|
#ifdef HAVE_SINGLE_SHRINKER_CALLBACK
|
|
sw->countfunc = countfunc;
|
|
sw->scanfunc = scanfunc;
|
|
shrinker->shrink = spl_shrinker_single_cb;
|
|
#else
|
|
shrinker->count_objects = countfunc;
|
|
shrinker->scan_objects = scanfunc;
|
|
#endif
|
|
|
|
/* set params */
|
|
shrinker->seeks = seek_cost;
|
|
|
|
/* register with kernel */
|
|
#if defined(HAVE_SHRINKER_REGISTER)
|
|
shrinker_register(shrinker);
|
|
#elif defined(HAVE_REGISTER_SHRINKER_VARARG)
|
|
register_shrinker(shrinker, name);
|
|
#else
|
|
register_shrinker(shrinker);
|
|
#endif
|
|
|
|
return (shrinker);
|
|
}
|
|
EXPORT_SYMBOL(spl_register_shrinker);
|
|
|
|
void
|
|
spl_unregister_shrinker(struct shrinker *shrinker)
|
|
{
|
|
#if defined(HAVE_SHRINKER_REGISTER)
|
|
shrinker_free(shrinker);
|
|
#elif defined(HAVE_SPLIT_SHRINKER_CALLBACK)
|
|
unregister_shrinker(shrinker);
|
|
kmem_free(shrinker, sizeof (struct shrinker));
|
|
#elif defined(HAVE_SINGLE_SHRINKER_CALLBACK)
|
|
unregister_shrinker(shrinker);
|
|
kmem_free(shrinker, sizeof (struct spl_shrinker_wrap));
|
|
#else
|
|
#error "Unknown shrinker API"
|
|
#endif
|
|
}
|
|
EXPORT_SYMBOL(spl_unregister_shrinker);
|