[linux-2.6-block.git] / fs / xfs / 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
 */

typedef unsigned __bitwise xfs_km_flags_t;
#define KM_SLEEP	((__force xfs_km_flags_t)0x0001u)
#define KM_NOSLEEP	((__force xfs_km_flags_t)0x0002u)
#define KM_NOFS		((__force xfs_km_flags_t)0x0004u)
#define KM_MAYFAIL	((__force xfs_km_flags_t)0x0008u)
#define KM_ZERO		((__force xfs_km_flags_t)0x0010u)

/*
 * 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(xfs_km_flags_t flags)
{
	gfp_t	lflags;

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

	if (flags & KM_NOSLEEP) {
		lflags = GFP_ATOMIC | __GFP_NOWARN;
	} else {
		lflags = GFP_KERNEL | __GFP_NOWARN;
		if (flags & KM_NOFS)
			lflags &= ~__GFP_FS;
	}

	/*
	 * Default page/slab allocator behavior is to retry for ever
	 * for small allocations. We can override this behavior by using
	 * __GFP_RETRY_MAYFAIL which will tell the allocator to retry as long
	 * as it is feasible but rather fail than retry forever for all
	 * request sizes.
	 */
	if (flags & KM_MAYFAIL)
		lflags |= __GFP_RETRY_MAYFAIL;

	if (flags & KM_ZERO)
		lflags |= __GFP_ZERO;

	return lflags;
}

extern void *kmem_alloc(size_t, xfs_km_flags_t);
extern void *kmem_alloc_large(size_t size, xfs_km_flags_t);
extern void *kmem_realloc(const void *, size_t, xfs_km_flags_t);
static inline void  kmem_free(const void *ptr)
{
	kvfree(ptr);
}


static inline void *
kmem_zalloc(size_t size, xfs_km_flags_t flags)
{
	return kmem_alloc(size, flags | KM_ZERO);
}

static inline void *
kmem_zalloc_large(size_t size, xfs_km_flags_t flags)
{
	return kmem_alloc_large(size, flags | KM_ZERO);
}

/*
 * Zone interfaces
 */

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

#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, slab_flags_t 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)
{
	kmem_cache_destroy(zone);
}

extern void *kmem_zone_alloc(kmem_zone_t *, xfs_km_flags_t);

static inline void *
kmem_zone_zalloc(kmem_zone_t *zone, xfs_km_flags_t flags)
{
	return kmem_zone_alloc(zone, flags | KM_ZERO);
}

#endif /* __XFS_SUPPORT_KMEM_H__ */
Commit	Line	Data
	1	/*
	2	* Copyright (c) 2000-2005 Silicon Graphics, Inc.
	3	* All Rights Reserved.
	4	*
	5	* This program is free software; you can redistribute it and/or
	6	* modify it under the terms of the GNU General Public License as
	7	* published by the Free Software Foundation.
	8	*
	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.
	13	*
	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
	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>
	24	#include <linux/vmalloc.h>
	25
	26	/*
	27	* General memory allocation interfaces
	28	*/
	29
	30	typedef unsigned __bitwise xfs_km_flags_t;
	31	#define KM_SLEEP ((__force xfs_km_flags_t)0x0001u)
	32	#define KM_NOSLEEP ((__force xfs_km_flags_t)0x0002u)
	33	#define KM_NOFS ((__force xfs_km_flags_t)0x0004u)
	34	#define KM_MAYFAIL ((__force xfs_km_flags_t)0x0008u)
	35	#define KM_ZERO ((__force xfs_km_flags_t)0x0010u)
	36
	37	/*
	38	* We use a special process flag to avoid recursive callbacks into
	39	* the filesystem during transactions. We will also issue our own
	40	* warnings, so we explicitly skip any generic ones (silly of us).
	41	*/
	42	static inline gfp_t
	43	kmem_flags_convert(xfs_km_flags_t flags)
	44	{
	45	gfp_t lflags;
	46
	47	BUG_ON(flags & ~(KM_SLEEP\|KM_NOSLEEP\|KM_NOFS\|KM_MAYFAIL\|KM_ZERO));
	48
	49	if (flags & KM_NOSLEEP) {
	50	lflags = GFP_ATOMIC \| __GFP_NOWARN;
	51	} else {
	52	lflags = GFP_KERNEL \| __GFP_NOWARN;
	53	if (flags & KM_NOFS)
	54	lflags &= ~__GFP_FS;
	55	}
	56
	57	/*
	58	* Default page/slab allocator behavior is to retry for ever
	59	* for small allocations. We can override this behavior by using
	60	* __GFP_RETRY_MAYFAIL which will tell the allocator to retry as long
	61	* as it is feasible but rather fail than retry forever for all
	62	* request sizes.
	63	*/
	64	if (flags & KM_MAYFAIL)
	65	lflags \|= __GFP_RETRY_MAYFAIL;
	66
	67	if (flags & KM_ZERO)
	68	lflags \|= __GFP_ZERO;
	69
	70	return lflags;
	71	}
	72
	73	extern void *kmem_alloc(size_t, xfs_km_flags_t);
	74	extern void *kmem_alloc_large(size_t size, xfs_km_flags_t);
	75	extern void kmem_realloc(const void , size_t, xfs_km_flags_t);
	76	static inline void kmem_free(const void *ptr)
	77	{
	78	kvfree(ptr);
	79	}
	80
	81
	82	static inline void *
	83	kmem_zalloc(size_t size, xfs_km_flags_t flags)
	84	{
	85	return kmem_alloc(size, flags \| KM_ZERO);
	86	}
	87
	88	static inline void *
	89	kmem_zalloc_large(size_t size, xfs_km_flags_t flags)
	90	{
	91	return kmem_alloc_large(size, flags \| KM_ZERO);
	92	}
	93
	94	/*
	95	* Zone interfaces
	96	*/
	97
	98	#define KM_ZONE_HWALIGN SLAB_HWCACHE_ALIGN
	99	#define KM_ZONE_RECLAIM SLAB_RECLAIM_ACCOUNT
	100	#define KM_ZONE_SPREAD SLAB_MEM_SPREAD
	101	#define KM_ZONE_ACCOUNT SLAB_ACCOUNT
	102
	103	#define kmem_zone kmem_cache
	104	#define kmem_zone_t struct kmem_cache
	105
	106	static inline kmem_zone_t *
	107	kmem_zone_init(int size, char *zone_name)
	108	{
	109	return kmem_cache_create(zone_name, size, 0, 0, NULL);
	110	}
	111
	112	static inline kmem_zone_t *
	113	kmem_zone_init_flags(int size, char *zone_name, slab_flags_t flags,
	114	void (construct)(void ))
	115	{
	116	return kmem_cache_create(zone_name, size, 0, flags, construct);
	117	}
	118
	119	static inline void
	120	kmem_zone_free(kmem_zone_t zone, void ptr)
	121	{
	122	kmem_cache_free(zone, ptr);
	123	}
	124
	125	static inline void
	126	kmem_zone_destroy(kmem_zone_t *zone)
	127	{
	128	kmem_cache_destroy(zone);
	129	}
	130
	131	extern void kmem_zone_alloc(kmem_zone_t , xfs_km_flags_t);
	132
	133	static inline void *
	134	kmem_zone_zalloc(kmem_zone_t *zone, xfs_km_flags_t flags)
	135	{
	136	return kmem_zone_alloc(zone, flags \| KM_ZERO);
	137	}
	138
	139	#endif /* __XFS_SUPPORT_KMEM_H__ */