[linux-2.6-block.git] / fs / xfs / linux-2.6 / kmem.h

/*
 * Copyright (c) 2000-2005 Silicon Graphics, Inc.
 * All Rights Reserved.
 *
 * This program 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.
 *
 * This program is distributed in the hope that it would 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 this program; if not, write the Free Software Foundation,
 * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */
#ifndef __XFS_SUPPORT_KMEM_H__
#define __XFS_SUPPORT_KMEM_H__

#include <linux/slab.h>
#include <linux/sched.h>
#include <linux/mm.h>
#include <linux/vmalloc.h>

/*
 * General memory allocation interfaces
 */

#define KM_SLEEP	0x0001u
#define KM_NOSLEEP	0x0002u
#define KM_NOFS		0x0004u
#define KM_MAYFAIL	0x0008u

/*
 * We use a special process flag to avoid recursive callbacks into
 * the filesystem during transactions.  We will also issue our own
 * warnings, so we explicitly skip any generic ones (silly of us).
 */
static inline gfp_t
kmem_flags_convert(unsigned int __nocast flags)
{
	gfp_t	lflags;

	BUG_ON(flags & ~(KM_SLEEP|KM_NOSLEEP|KM_NOFS|KM_MAYFAIL));

	if (flags & KM_NOSLEEP) {
		lflags = GFP_ATOMIC | __GFP_NOWARN;
	} else {
		lflags = GFP_KERNEL | __GFP_NOWARN;
		if ((current->flags & PF_FSTRANS) || (flags & KM_NOFS))
			lflags &= ~__GFP_FS;
	}
	return lflags;
}

extern void *kmem_alloc(size_t, unsigned int __nocast);
extern void *kmem_zalloc(size_t, unsigned int __nocast);
extern void *kmem_realloc(const void *, size_t, size_t, unsigned int __nocast);
extern void  kmem_free(const void *);

static inline void *kmem_zalloc_large(size_t size)
{
	void *ptr;

	ptr = vmalloc(size);
	if (ptr)
		memset(ptr, 0, size);
	return ptr;
}
static inline void kmem_free_large(void *ptr)
{
	vfree(ptr);
}

extern void *kmem_zalloc_greedy(size_t *, size_t, size_t);

/*
 * Zone interfaces
 */

#define KM_ZONE_HWALIGN	SLAB_HWCACHE_ALIGN
#define KM_ZONE_RECLAIM	SLAB_RECLAIM_ACCOUNT
#define KM_ZONE_SPREAD	SLAB_MEM_SPREAD

#define kmem_zone	kmem_cache
#define kmem_zone_t	struct kmem_cache

static inline kmem_zone_t *
kmem_zone_init(int size, char *zone_name)
{
	return kmem_cache_create(zone_name, size, 0, 0, NULL);
}

static inline kmem_zone_t *
kmem_zone_init_flags(int size, char *zone_name, unsigned long flags,
		     void (*construct)(void *))
{
	return kmem_cache_create(zone_name, size, 0, flags, construct);
}

static inline void
kmem_zone_free(kmem_zone_t *zone, void *ptr)
{
	kmem_cache_free(zone, ptr);
}

static inline void
kmem_zone_destroy(kmem_zone_t *zone)
{
	if (zone)
		kmem_cache_destroy(zone);
}

extern void *kmem_zone_alloc(kmem_zone_t *, unsigned int __nocast);
extern void *kmem_zone_zalloc(kmem_zone_t *, unsigned int __nocast);

static inline int
kmem_shake_allow(gfp_t gfp_mask)
{
	return ((gfp_mask & __GFP_WAIT) && (gfp_mask & __GFP_FS));
}

#endif /* __XFS_SUPPORT_KMEM_H__ */
Commit	Line	Data
1da177e4	1	/*
7b718769 NS	2	* Copyright (c) 2000-2005 Silicon Graphics, Inc.
7b718769 NS	3	* All Rights Reserved.
1da177e4	4	*
7b718769 NS	5	* This program is free software; you can redistribute it and/or
7b718769 NS	6	* modify it under the terms of the GNU General Public License as
1da177e4 LT	7	* published by the Free Software Foundation.
1da177e4 LT	8	*
7b718769 NS	9	* This program is distributed in the hope that it would be useful,
	10	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	11	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	12	* GNU General Public License for more details.
1da177e4	13	*
7b718769 NS	14	* You should have received a copy of the GNU General Public License
	15	* along with this program; if not, write the Free Software Foundation,
	16	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
1da177e4 LT	17	*/
	18	#ifndef __XFS_SUPPORT_KMEM_H__
	19	#define __XFS_SUPPORT_KMEM_H__
	20
	21	#include <linux/slab.h>
	22	#include <linux/sched.h>
	23	#include <linux/mm.h>
bdfb0430	24	#include <linux/vmalloc.h>
1da177e4	25
8758280f NS	26	/*
	27	* General memory allocation interfaces
	28	*/
	29
	30	#define KM_SLEEP 0x0001u
	31	#define KM_NOSLEEP 0x0002u
	32	#define KM_NOFS 0x0004u
	33	#define KM_MAYFAIL 0x0008u
	34
	35	/*
	36	* We use a special process flag to avoid recursive callbacks into
	37	* the filesystem during transactions. We will also issue our own
	38	* warnings, so we explicitly skip any generic ones (silly of us).
	39	*/
	40	static inline gfp_t
	41	kmem_flags_convert(unsigned int __nocast flags)
1da177e4	42	{
8758280f	43	gfp_t lflags;
1da177e4	44
bdfb0430	45	BUG_ON(flags & ~(KM_SLEEP\|KM_NOSLEEP\|KM_NOFS\|KM_MAYFAIL));
1da177e4 LT	46
1da177e4 LT	47	if (flags & KM_NOSLEEP) {
8758280f	48	lflags = GFP_ATOMIC \| __GFP_NOWARN;
1da177e4	49	} else {
8758280f	50	lflags = GFP_KERNEL \| __GFP_NOWARN;
59c1b082	51	if ((current->flags & PF_FSTRANS) \|\| (flags & KM_NOFS))
1da177e4 LT	52	lflags &= ~__GFP_FS;
1da177e4 LT	53	}
8758280f	54	return lflags;
1da177e4 LT	55	}
1da177e4 LT	56
8758280f	57	extern void *kmem_alloc(size_t, unsigned int __nocast);
8758280f	58	extern void *kmem_zalloc(size_t, unsigned int __nocast);
d3689d76 BN	59	extern void kmem_realloc(const void , size_t, size_t, unsigned int __nocast);
d3689d76 BN	60	extern void kmem_free(const void *);
8758280f	61
bdfb0430 CH	62	static inline void *kmem_zalloc_large(size_t size)
	63	{
	64	void *ptr;
	65
	66	ptr = vmalloc(size);
	67	if (ptr)
	68	memset(ptr, 0, size);
	69	return ptr;
	70	}
	71	static inline void kmem_free_large(void *ptr)
	72	{
	73	vfree(ptr);
	74	}
	75
	76	extern void kmem_zalloc_greedy(size_t , size_t, size_t);
	77
8758280f NS	78	/*
	79	* Zone interfaces
	80	*/
	81
	82	#define KM_ZONE_HWALIGN SLAB_HWCACHE_ALIGN
	83	#define KM_ZONE_RECLAIM SLAB_RECLAIM_ACCOUNT
b0196009	84	#define KM_ZONE_SPREAD SLAB_MEM_SPREAD
8758280f NS	85
	86	#define kmem_zone kmem_cache
	87	#define kmem_zone_t struct kmem_cache
	88
	89	static inline kmem_zone_t *
1da177e4 LT	90	kmem_zone_init(int size, char *zone_name)
1da177e4 LT	91	{
20c2df83	92	return kmem_cache_create(zone_name, size, 0, 0, NULL);
1da177e4 LT	93	}
1da177e4 LT	94
8758280f NS	95	static inline kmem_zone_t *
8758280f NS	96	kmem_zone_init_flags(int size, char *zone_name, unsigned long flags,
51cc5068	97	void (construct)(void ))
8758280f	98	{
20c2df83	99	return kmem_cache_create(zone_name, size, 0, flags, construct);
8758280f NS	100	}
	101
	102	static inline void
1da177e4 LT	103	kmem_zone_free(kmem_zone_t zone, void ptr)
	104	{
	105	kmem_cache_free(zone, ptr);
	106	}
	107
8758280f	108	static inline void
1da177e4 LT	109	kmem_zone_destroy(kmem_zone_t *zone)
1da177e4 LT	110	{
1a1d92c1 AD	111	if (zone)
1a1d92c1 AD	112	kmem_cache_destroy(zone);
1da177e4 LT	113	}
1da177e4 LT	114
7f248a81	115	extern void kmem_zone_alloc(kmem_zone_t , unsigned int __nocast);
8758280f	116	extern void kmem_zone_zalloc(kmem_zone_t , unsigned int __nocast);
1da177e4	117
8758280f	118	static inline int
27496a8c	119	kmem_shake_allow(gfp_t gfp_mask)
1da177e4	120	{
1b17d766	121	return ((gfp_mask & __GFP_WAIT) && (gfp_mask & __GFP_FS));
1da177e4 LT	122	}
	123
	124	#endif /* __XFS_SUPPORT_KMEM_H__ */