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27 * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
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33 * This file is part of Lustre, http://www.lustre.org/
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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 typedef struct page cfs_page_t;
61 #define CFS_PAGE_SIZE PAGE_CACHE_SIZE
62 #define CFS_PAGE_SHIFT PAGE_CACHE_SHIFT
63 #define CFS_PAGE_MASK (~((__u64)CFS_PAGE_SIZE-1))
65 #define cfs_num_physpages num_physpages
67 #define cfs_copy_from_user(to, from, n) copy_from_user(to, from, n)
68 #define cfs_copy_to_user(to, from, n) copy_to_user(to, from, n)
70 static inline void *cfs_page_address(cfs_page_t *page)
73 * XXX nikita: do NOT call portals_debug_msg() (CDEBUG/ENTRY/EXIT)
74 * from here: this will lead to infinite recursion.
76 return page_address(page);
79 static inline void *cfs_kmap(cfs_page_t *page)
84 static inline void cfs_kunmap(cfs_page_t *page)
89 static inline void cfs_get_page(cfs_page_t *page)
94 static inline int cfs_page_count(cfs_page_t *page)
96 return page_count(page);
99 #define cfs_page_index(p) ((p)->index)
101 #define cfs_page_pin(page) page_cache_get(page)
102 #define cfs_page_unpin(page) page_cache_release(page)
106 * XXX Liang: move these declare to public file
108 extern void *cfs_alloc(size_t nr_bytes, u_int32_t flags);
109 extern void cfs_free(void *addr);
111 extern void *cfs_alloc_large(size_t nr_bytes);
112 extern void cfs_free_large(void *addr);
114 extern cfs_page_t *cfs_alloc_page(unsigned int flags);
115 extern void cfs_free_page(cfs_page_t *page);
117 #define cfs_memory_pressure_get() (current->flags & PF_MEMALLOC)
118 #define cfs_memory_pressure_set() do { current->flags |= PF_MEMALLOC; } while (0)
119 #define cfs_memory_pressure_clr() do { current->flags &= ~PF_MEMALLOC; } while (0)
121 #if BITS_PER_LONG == 32
122 /* limit to lowmem on 32-bit systems */
123 #define CFS_NUM_CACHEPAGES \
124 min(cfs_num_physpages, 1UL << (30 - CFS_PAGE_SHIFT) * 3 / 4)
126 #define CFS_NUM_CACHEPAGES cfs_num_physpages
130 * In Linux there is no way to determine whether current execution context is
133 #define CFS_ALLOC_ATOMIC_TRY CFS_ALLOC_ATOMIC
137 * XXX Liang: move these declare to public file
139 typedef struct kmem_cache cfs_mem_cache_t;
140 extern cfs_mem_cache_t * cfs_mem_cache_create (const char *, size_t, size_t, unsigned long);
141 extern int cfs_mem_cache_destroy ( cfs_mem_cache_t * );
142 extern void *cfs_mem_cache_alloc ( cfs_mem_cache_t *, int);
143 extern void cfs_mem_cache_free ( cfs_mem_cache_t *, void *);
144 extern int cfs_mem_is_in_cache(const void *addr, const cfs_mem_cache_t *kmem);
146 #define CFS_DECL_MMSPACE mm_segment_t __oldfs
147 #define CFS_MMSPACE_OPEN \
148 do { __oldfs = get_fs(); set_fs(get_ds());} while(0)
149 #define CFS_MMSPACE_CLOSE set_fs(__oldfs)
151 #define CFS_SLAB_HWCACHE_ALIGN SLAB_HWCACHE_ALIGN
152 #define CFS_SLAB_KERNEL SLAB_KERNEL
153 #define CFS_SLAB_NOFS SLAB_NOFS
158 * NB: we will rename these functions in a separate patch:
159 * - rename cfs_alloc to cfs_malloc
160 * - rename cfs_alloc/free_page to cfs_page_alloc/free
161 * - rename cfs_alloc/free_large to cfs_vmalloc/vfree
163 extern void *cfs_cpt_malloc(struct cfs_cpt_table *cptab, int cpt,
164 size_t nr_bytes, unsigned int flags);
165 extern void *cfs_cpt_vmalloc(struct cfs_cpt_table *cptab, int cpt,
167 extern cfs_page_t *cfs_page_cpt_alloc(struct cfs_cpt_table *cptab,
168 int cpt, unsigned int flags);
169 extern void *cfs_mem_cache_cpt_alloc(cfs_mem_cache_t *cachep,
170 struct cfs_cpt_table *cptab,
171 int cpt, unsigned int flags);
176 #define cfs_shrinker shrinker
178 #ifdef HAVE_SHRINK_CONTROL
179 # define SHRINKER_ARGS(sc, nr_to_scan, gfp_mask) \
180 struct shrinker *shrinker, \
181 struct shrink_control *sc
182 # define shrink_param(sc, var) ((sc)->var)
184 # ifdef HAVE_SHRINKER_WANT_SHRINK_PTR
185 # define SHRINKER_ARGS(sc, nr_to_scan, gfp_mask) \
186 struct shrinker *shrinker, \
187 int nr_to_scan, gfp_t gfp_mask
189 # define SHRINKER_ARGS(sc, nr_to_scan, gfp_mask) \
190 int nr_to_scan, gfp_t gfp_mask
192 # define shrink_param(sc, var) (var)
195 #ifdef HAVE_REGISTER_SHRINKER
196 typedef int (*cfs_shrinker_t)(SHRINKER_ARGS(sc, nr_to_scan, gfp_mask));
199 struct cfs_shrinker *cfs_set_shrinker(int seek, cfs_shrinker_t func)
203 s = kmalloc(sizeof(*s), GFP_KERNEL);
210 register_shrinker(s);
216 void cfs_remove_shrinker(struct cfs_shrinker *shrinker)
218 if (shrinker == NULL)
221 unregister_shrinker(shrinker);
225 typedef shrinker_t cfs_shrinker_t;
226 #define cfs_set_shrinker(s, f) set_shrinker(s, f)
227 #define cfs_remove_shrinker(s) remove_shrinker(s)
230 #define CFS_DEFAULT_SEEKS DEFAULT_SEEKS
231 #endif /* __LINUX_CFS_MEM_H__ */