1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2 * vim:expandtab:shiftwidth=8:tabstop=8:
6 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 only,
10 * as published by the Free Software Foundation.
12 * This program is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License version 2 for more details (a copy is included
16 * in the LICENSE file that accompanied this code).
18 * You should have received a copy of the GNU General Public License
19 * version 2 along with this program; If not, see
20 * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
22 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
23 * CA 95054 USA or visit www.sun.com if you need additional information or
29 * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
30 * Use is subject to license terms.
32 * Copyright (c) 2011, Whamcloud, Inc.
35 * This file is part of Lustre, http://www.lustre.org/
36 * Lustre is a trademark of Sun Microsystems, Inc.
38 * libcfs/include/libcfs/linux/linux-mem.h
40 * Basic library routines.
43 #ifndef __LIBCFS_LINUX_CFS_MEM_H__
44 #define __LIBCFS_LINUX_CFS_MEM_H__
46 #ifndef __LIBCFS_LIBCFS_H__
47 #error Do not #include this file directly. #include <libcfs/libcfs.h> instead
51 #error This include is only for kernel use.
55 #include <linux/vmalloc.h>
56 #include <linux/pagemap.h>
57 #include <linux/slab.h>
59 # include <linux/mm_inline.h>
62 typedef struct page cfs_page_t;
63 #define CFS_PAGE_SIZE PAGE_CACHE_SIZE
64 #define CFS_PAGE_SHIFT PAGE_CACHE_SHIFT
65 #define CFS_PAGE_MASK (~((__u64)CFS_PAGE_SIZE-1))
67 #define cfs_num_physpages num_physpages
69 #define cfs_copy_from_user(to, from, n) copy_from_user(to, from, n)
70 #define cfs_copy_to_user(to, from, n) copy_to_user(to, from, n)
72 static inline void *cfs_page_address(cfs_page_t *page)
75 * XXX nikita: do NOT call portals_debug_msg() (CDEBUG/ENTRY/EXIT)
76 * from here: this will lead to infinite recursion.
78 return page_address(page);
81 static inline void *cfs_kmap(cfs_page_t *page)
86 static inline void cfs_kunmap(cfs_page_t *page)
91 static inline void cfs_get_page(cfs_page_t *page)
96 static inline int cfs_page_count(cfs_page_t *page)
98 return page_count(page);
101 #define cfs_page_index(p) ((p)->index)
103 #define cfs_page_pin(page) page_cache_get(page)
104 #define cfs_page_unpin(page) page_cache_release(page)
108 * XXX Liang: move these declare to public file
110 extern void *cfs_alloc(size_t nr_bytes, u_int32_t flags);
111 extern void cfs_free(void *addr);
113 extern void *cfs_alloc_large(size_t nr_bytes);
114 extern void cfs_free_large(void *addr);
116 extern cfs_page_t *cfs_alloc_page(unsigned int flags);
117 extern void cfs_free_page(cfs_page_t *page);
119 #define cfs_memory_pressure_get() (current->flags & PF_MEMALLOC)
120 #define cfs_memory_pressure_set() do { current->flags |= PF_MEMALLOC; } while (0)
121 #define cfs_memory_pressure_clr() do { current->flags &= ~PF_MEMALLOC; } while (0)
123 #if BITS_PER_LONG == 32
124 /* limit to lowmem on 32-bit systems */
125 #define CFS_NUM_CACHEPAGES \
126 min(cfs_num_physpages, 1UL << (30 - CFS_PAGE_SHIFT) * 3 / 4)
128 #define CFS_NUM_CACHEPAGES cfs_num_physpages
132 * In Linux there is no way to determine whether current execution context is
135 #define CFS_ALLOC_ATOMIC_TRY CFS_ALLOC_ATOMIC
139 * XXX Liang: move these declare to public file
141 #ifdef HAVE_KMEM_CACHE
142 typedef struct kmem_cache cfs_mem_cache_t;
144 typedef kmem_cache_t cfs_mem_cache_t;
146 extern cfs_mem_cache_t * cfs_mem_cache_create (const char *, size_t, size_t, unsigned long);
147 extern int cfs_mem_cache_destroy ( cfs_mem_cache_t * );
148 extern void *cfs_mem_cache_alloc ( cfs_mem_cache_t *, int);
149 extern void cfs_mem_cache_free ( cfs_mem_cache_t *, void *);
150 extern int cfs_mem_is_in_cache(const void *addr, const cfs_mem_cache_t *kmem);
152 #define CFS_DECL_MMSPACE mm_segment_t __oldfs
153 #define CFS_MMSPACE_OPEN \
154 do { __oldfs = get_fs(); set_fs(get_ds());} while(0)
155 #define CFS_MMSPACE_CLOSE set_fs(__oldfs)
157 #define CFS_SLAB_HWCACHE_ALIGN SLAB_HWCACHE_ALIGN
158 #define CFS_SLAB_KERNEL SLAB_KERNEL
159 #define CFS_SLAB_NOFS SLAB_NOFS
164 #define cfs_shrinker shrinker
166 #ifdef HAVE_SHRINK_CONTROL
167 # define SHRINKER_ARGS(sc, nr_to_scan, gfp_mask) \
168 struct shrinker *shrinker, \
169 struct shrink_control *sc
170 # define shrink_param(sc, var) ((sc)->var)
172 # ifdef HAVE_SHRINKER_WANT_SHRINK_PTR
173 # define SHRINKER_ARGS(sc, nr_to_scan, gfp_mask) \
174 struct shrinker *shrinker, \
175 int nr_to_scan, gfp_t gfp_mask
177 # define SHRINKER_ARGS(sc, nr_to_scan, gfp_mask) \
178 int nr_to_scan, gfp_t gfp_mask
180 # define shrink_param(sc, var) (var)
183 #ifdef HAVE_REGISTER_SHRINKER
184 typedef int (*cfs_shrinker_t)(SHRINKER_ARGS(sc, nr_to_scan, gfp_mask));
187 struct cfs_shrinker *cfs_set_shrinker(int seek, cfs_shrinker_t func)
191 s = kmalloc(sizeof(*s), GFP_KERNEL);
198 register_shrinker(s);
204 void cfs_remove_shrinker(struct cfs_shrinker *shrinker)
206 if (shrinker == NULL)
209 unregister_shrinker(shrinker);
213 typedef shrinker_t cfs_shrinker_t;
214 #define cfs_set_shrinker(s, f) set_shrinker(s, f)
215 #define cfs_remove_shrinker(s) remove_shrinker(s)
218 #define CFS_DEFAULT_SEEKS DEFAULT_SEEKS
219 #endif /* __LINUX_CFS_MEM_H__ */