4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 only,
8 * as published by the Free Software Foundation.
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License version 2 for more details (a copy is included
14 * in the LICENSE file that accompanied this code).
16 * You should have received a copy of the GNU General Public License
17 * version 2 along with this program; If not, see
18 * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
20 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
21 * CA 95054 USA or visit www.sun.com if you need additional information or
27 * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
28 * Use is subject to license terms.
30 * Copyright (c) 2011, 2014, Intel Corporation.
33 * This file is part of Lustre, http://www.lustre.org/
34 * Lustre is a trademark of Sun Microsystems, Inc.
36 * libcfs/include/libcfs/linux/linux-mem.h
38 * Basic library routines.
41 #ifndef __LIBCFS_LINUX_CFS_MEM_H__
42 #define __LIBCFS_LINUX_CFS_MEM_H__
44 #ifndef __LIBCFS_LIBCFS_H__
45 #error Do not #include this file directly. #include <libcfs/libcfs.h> instead
49 #error This include is only for kernel use.
53 #include <linux/vmalloc.h>
54 #include <linux/pagemap.h>
55 #include <linux/slab.h>
57 # include <linux/mm_inline.h>
60 /* GFP_IOFS was added in 2.6.33 kernel */
62 #define GFP_IOFS (__GFP_IO | __GFP_FS)
68 #ifdef HAVE_SHRINK_CONTROL
69 # define SHRINKER_ARGS(sc, nr_to_scan, gfp_mask) \
70 struct shrinker *shrinker, \
71 struct shrink_control *sc
72 # define shrink_param(sc, var) ((sc)->var)
74 struct shrink_control {
76 unsigned long nr_to_scan;
78 # ifdef HAVE_SHRINKER_WANT_SHRINK_PTR
79 # define SHRINKER_ARGS(sc, nr_to_scan, gfp_mask) \
80 struct shrinker *shrinker, \
81 int nr_to_scan, gfp_t gfp_mask
83 # define SHRINKER_ARGS(sc, nr_to_scan, gfp_mask) \
84 int nr_to_scan, gfp_t gfp_mask
86 /* avoid conflict with spl mm_compat.h */
87 # define HAVE_SHRINK_CONTROL_STRUCT 1
88 # define shrink_param(sc, var) (var)
91 #ifdef HAVE_SHRINKER_COUNT
93 unsigned long (*count)(struct shrinker *,
94 struct shrink_control *sc);
95 unsigned long (*scan)(struct shrinker *,
96 struct shrink_control *sc);
98 # define DEF_SHRINKER_VAR(name, shrink, count_obj, scan_obj) \
99 struct shrinker_var name = { .count = count_obj, .scan = scan_obj }
101 struct shrinker_var {
102 int (*shrink)(SHRINKER_ARGS(sc, nr_to_scan, gfp_mask));
104 # define DEF_SHRINKER_VAR(name, shrinker, count, scan) \
105 struct shrinker_var name = { .shrink = shrinker }
106 # define SHRINK_STOP (~0UL)
110 struct shrinker *set_shrinker(int seek, struct shrinker_var *var)
114 s = kzalloc(sizeof(*s), GFP_KERNEL);
118 #ifdef HAVE_SHRINKER_COUNT
119 s->count_objects = var->count;
120 s->scan_objects = var->scan;
122 s->shrink = var->shrink;
126 register_shrinker(s);
132 void remove_shrinker(struct shrinker *shrinker)
134 if (shrinker == NULL)
137 unregister_shrinker(shrinker);
141 #endif /* __LINUX_CFS_MEM_H__ */