mirror of
https://git.proxmox.com/git/mirror_zfs.git
synced 2024-12-30 21:09:38 +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
86 lines
2.6 KiB
C
86 lines
2.6 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/>.
|
|
*/
|
|
|
|
#ifndef _SPL_SHRINKER_H
|
|
#define _SPL_SHRINKER_H
|
|
|
|
#include <linux/mm.h>
|
|
#include <linux/fs.h>
|
|
|
|
/*
|
|
* Due to frequent changes in the shrinker API the following
|
|
* compatibility wrapper should be used.
|
|
*
|
|
* shrinker = spl_register_shrinker(name, countfunc, scanfunc, seek_cost);
|
|
* spl_unregister_shrinker(shrinker);
|
|
*
|
|
* spl_register_shrinker is used to create and register a shrinker with the
|
|
* given name.
|
|
* The countfunc returns the number of free-able objects.
|
|
* The scanfunc returns the number of objects that were freed.
|
|
* The callbacks can return SHRINK_STOP if further calls can't make any more
|
|
* progress. Note that a return value of SHRINK_EMPTY is currently not
|
|
* supported.
|
|
*
|
|
* Example:
|
|
*
|
|
* static unsigned long
|
|
* my_count(struct shrinker *shrink, struct shrink_control *sc)
|
|
* {
|
|
* ...calculate number of objects in the cache...
|
|
*
|
|
* return (number of objects in the cache);
|
|
* }
|
|
*
|
|
* static unsigned long
|
|
* my_scan(struct shrinker *shrink, struct shrink_control *sc)
|
|
* {
|
|
* ...scan objects in the cache and reclaim them...
|
|
* }
|
|
*
|
|
* static struct shrinker *my_shrinker;
|
|
*
|
|
* void my_init_func(void) {
|
|
* my_shrinker = spl_register_shrinker("my-shrinker",
|
|
* my_count, my_scan, DEFAULT_SEEKS);
|
|
* }
|
|
*
|
|
* void my_fini_func(void) {
|
|
* spl_unregister_shrinker(my_shrinker);
|
|
* }
|
|
*/
|
|
|
|
typedef unsigned long (*spl_shrinker_cb)
|
|
(struct shrinker *, struct shrink_control *);
|
|
|
|
struct shrinker *spl_register_shrinker(const char *name,
|
|
spl_shrinker_cb countfunc, spl_shrinker_cb scanfunc, int seek_cost);
|
|
void spl_unregister_shrinker(struct shrinker *);
|
|
|
|
#ifndef SHRINK_STOP
|
|
/* 3.0-3.11 compatibility */
|
|
#define SHRINK_STOP (-1)
|
|
#endif
|
|
|
|
#endif /* SPL_SHRINKER_H */
|