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Add a greedy allocation interface, allocating within a min/max size range.
Merge of xfs-linux-melb:xfs-kern:26803a by kenmcd.

/*
 * 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/cache_def.h>

/*
 * General memory allocation interfaces
 */

#define KM_SLEEP	0x0001
#define KM_NOSLEEP	0x0002
#define KM_NOFS		0x0004
#define KM_MAYFAIL	0x0008
#define KM_LARGE	0x0010

/*
 * 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 unsigned int
kmem_flags_convert(int flags)
{
	int	lflags;

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

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

extern void *kmem_alloc(size_t, int);
extern void *kmem_zalloc(size_t, int);
extern void *kmem_zalloc_greedy(size_t *, size_t, size_t, int);
extern void *kmem_realloc(void *, size_t, size_t, int);
extern void  kmem_free(void *, size_t);

/*
 * Zone interfaces
 */

#define KM_ZONE_HWALIGN	SLAB_HWCACHE_ALIGN
#define KM_ZONE_RECLAIM	0
#define KM_ZONE_SPREAD	0

#define kmem_zone	kmem_cache_s
#define kmem_zone_t	kmem_cache_t

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

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

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))
		BUG();
}

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

/*
 * Low memory cache shrinkers
 */

typedef struct cache_definition *kmem_shaker_t;
typedef int (*kmem_shake_func_t)(int, unsigned int);

extern kmem_shaker_t kmem_shake_register(kmem_shake_func_t);
extern void kmem_shake_deregister(kmem_shaker_t);

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

#endif /* __XFS_SUPPORT_KMEM_H__ */