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 2008 Sun Microsystems, Inc. All rights reserved
30 * Use is subject to license terms.
33 * This file is part of Lustre, http://www.lustre.org/
34 * Lustre is a trademark of Sun Microsystems, Inc.
36 * lnet/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 # include <linux/mm.h>
50 # include <linux/vmalloc.h>
51 # include <linux/pagemap.h>
52 # include <linux/slab.h>
53 # ifdef HAVE_MM_INLINE
54 # include <linux/mm_inline.h>
57 typedef struct page cfs_page_t;
58 #define CFS_PAGE_SIZE PAGE_CACHE_SIZE
59 #define CFS_PAGE_SHIFT PAGE_CACHE_SHIFT
60 #define CFS_PAGE_MASK (~((__u64)CFS_PAGE_SIZE-1))
62 static inline void *cfs_page_address(cfs_page_t *page)
65 * XXX nikita: do NOT call portals_debug_msg() (CDEBUG/ENTRY/EXIT)
66 * from here: this will lead to infinite recursion.
68 return page_address(page);
71 static inline void *cfs_kmap(cfs_page_t *page)
76 static inline void cfs_kunmap(cfs_page_t *page)
81 static inline void cfs_get_page(cfs_page_t *page)
86 static inline int cfs_page_count(cfs_page_t *page)
88 return page_count(page);
91 #define cfs_page_index(p) ((p)->index)
93 #define cfs_page_pin(page) page_cache_get(page)
94 #define cfs_page_unpin(page) page_cache_release(page)
98 * XXX Liang: move these declare to public file
100 extern void *cfs_alloc(size_t nr_bytes, u_int32_t flags);
101 extern void cfs_free(void *addr);
103 extern void *cfs_alloc_large(size_t nr_bytes);
104 extern void cfs_free_large(void *addr);
106 extern cfs_page_t *cfs_alloc_pages(unsigned int flags, unsigned int order);
107 extern void __cfs_free_pages(cfs_page_t *page, unsigned int order);
109 #define cfs_alloc_page(flags) cfs_alloc_pages(flags, 0)
110 #define __cfs_free_page(page) __cfs_free_pages(page, 0)
111 #define cfs_free_page(p) __free_pages(p, 0)
113 #define libcfs_memory_pressure_get() (current->flags & PF_MEMALLOC)
114 #define libcfs_memory_pressure_set() do { current->flags |= PF_MEMALLOC; } while(0)
115 #define libcfs_memory_pressure_clr() do { current->flags &= ~PF_MEMALLOC; } while (0)
117 #if BITS_PER_LONG == 32
118 /* limit to lowmem on 32-bit systems */
119 #define CFS_NUM_CACHEPAGES min(num_physpages, 1UL << (30-CFS_PAGE_SHIFT) *3/4)
121 #define CFS_NUM_CACHEPAGES num_physpages
125 * In Linux there is no way to determine whether current execution context is
128 #define CFS_ALLOC_ATOMIC_TRY CFS_ALLOC_ATOMIC
132 * XXX Liang: move these declare to public file
134 #ifdef HAVE_KMEM_CACHE
135 typedef struct kmem_cache cfs_mem_cache_t;
137 typedef kmem_cache_t cfs_mem_cache_t;
139 extern cfs_mem_cache_t * cfs_mem_cache_create (const char *, size_t, size_t, unsigned long);
140 extern int cfs_mem_cache_destroy ( cfs_mem_cache_t * );
141 extern void *cfs_mem_cache_alloc ( cfs_mem_cache_t *, int);
142 extern void cfs_mem_cache_free ( cfs_mem_cache_t *, void *);
146 #define CFS_DECL_MMSPACE mm_segment_t __oldfs
147 #define CFS_MMSPACE_OPEN do { __oldfs = get_fs(); set_fs(get_ds());} while(0)
148 #define CFS_MMSPACE_CLOSE set_fs(__oldfs)
150 #else /* !__KERNEL__ */
151 #ifdef HAVE_ASM_PAGE_H
152 #include <asm/page.h> /* needed for PAGE_SIZE - rread */
155 #include <libcfs/user-prim.h>
159 #endif /* __LINUX_CFS_MEM_H__ */