[mirror_ubuntu-bionic-kernel.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)

/*
 * 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));

	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, xfs_km_flags_t);
extern void *kmem_zalloc(size_t, xfs_km_flags_t);
extern void *kmem_zalloc_large(size_t size, xfs_km_flags_t);
extern void *kmem_realloc(const void *, size_t, size_t, xfs_km_flags_t);
extern void  kmem_free(const void *);


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 *, xfs_km_flags_t);
extern void *kmem_zone_zalloc(kmem_zone_t *, xfs_km_flags_t);

#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
77ba7877 AV	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)
8758280f NS	35
	36	/*
	37	* We use a special process flag to avoid recursive callbacks into
	38	* the filesystem during transactions. We will also issue our own
	39	* warnings, so we explicitly skip any generic ones (silly of us).
	40	*/
	41	static inline gfp_t
77ba7877	42	kmem_flags_convert(xfs_km_flags_t flags)
1da177e4	43	{
8758280f	44	gfp_t lflags;
1da177e4	45
bdfb0430	46	BUG_ON(flags & ~(KM_SLEEP\|KM_NOSLEEP\|KM_NOFS\|KM_MAYFAIL));
1da177e4 LT	47
1da177e4 LT	48	if (flags & KM_NOSLEEP) {
8758280f	49	lflags = GFP_ATOMIC \| __GFP_NOWARN;
1da177e4	50	} else {
8758280f	51	lflags = GFP_KERNEL \| __GFP_NOWARN;
59c1b082	52	if ((current->flags & PF_FSTRANS) \|\| (flags & KM_NOFS))
1da177e4 LT	53	lflags &= ~__GFP_FS;
1da177e4 LT	54	}
8758280f	55	return lflags;
1da177e4 LT	56	}
1da177e4 LT	57
77ba7877 AV	58	extern void *kmem_alloc(size_t, xfs_km_flags_t);
77ba7877 AV	59	extern void *kmem_zalloc(size_t, xfs_km_flags_t);
fdd3ccee	60	extern void *kmem_zalloc_large(size_t size, xfs_km_flags_t);
77ba7877	61	extern void kmem_realloc(const void , size_t, size_t, xfs_km_flags_t);
d3689d76	62	extern void kmem_free(const void *);
8758280f	63
bdfb0430 CH	64
	65	extern void kmem_zalloc_greedy(size_t , size_t, size_t);
	66
8758280f NS	67	/*
	68	* Zone interfaces
	69	*/
	70
	71	#define KM_ZONE_HWALIGN SLAB_HWCACHE_ALIGN
	72	#define KM_ZONE_RECLAIM SLAB_RECLAIM_ACCOUNT
b0196009	73	#define KM_ZONE_SPREAD SLAB_MEM_SPREAD
8758280f NS	74
	75	#define kmem_zone kmem_cache
	76	#define kmem_zone_t struct kmem_cache
	77
	78	static inline kmem_zone_t *
1da177e4 LT	79	kmem_zone_init(int size, char *zone_name)
1da177e4 LT	80	{
20c2df83	81	return kmem_cache_create(zone_name, size, 0, 0, NULL);
1da177e4 LT	82	}
1da177e4 LT	83
8758280f NS	84	static inline kmem_zone_t *
8758280f NS	85	kmem_zone_init_flags(int size, char *zone_name, unsigned long flags,
51cc5068	86	void (construct)(void ))
8758280f	87	{
20c2df83	88	return kmem_cache_create(zone_name, size, 0, flags, construct);
8758280f NS	89	}
	90
	91	static inline void
1da177e4 LT	92	kmem_zone_free(kmem_zone_t zone, void ptr)
	93	{
	94	kmem_cache_free(zone, ptr);
	95	}
	96
8758280f	97	static inline void
1da177e4 LT	98	kmem_zone_destroy(kmem_zone_t *zone)
1da177e4 LT	99	{
1a1d92c1 AD	100	if (zone)
1a1d92c1 AD	101	kmem_cache_destroy(zone);
1da177e4 LT	102	}
1da177e4 LT	103
77ba7877 AV	104	extern void kmem_zone_alloc(kmem_zone_t , xfs_km_flags_t);
77ba7877 AV	105	extern void kmem_zone_zalloc(kmem_zone_t , xfs_km_flags_t);
1da177e4	106
1da177e4	107	#endif /* __XFS_SUPPORT_KMEM_H__ */