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Linux 6.7 compat: rework shrinker setup for heap allocations
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 openzfs#15681
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,115 @@ | ||
| /* | ||
| * 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); |
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