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
 30typedef 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 */
 42static inline gfp_t
 43kmem_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 ((current->flags & PF_FSTRANS) || (flags & KM_NOFS))
 54			lflags &= ~__GFP_FS;
 55	}
 56
 57	if (flags & KM_ZERO)
 58		lflags |= __GFP_ZERO;
 59
 60	return lflags;
 61}
 62
 63extern void *kmem_alloc(size_t, xfs_km_flags_t);
 64extern void *kmem_zalloc_large(size_t size, xfs_km_flags_t);
 65extern void *kmem_realloc(const void *, size_t, size_t, xfs_km_flags_t);
 66extern void  kmem_free(const void *);
 67
 68
 69extern void *kmem_zalloc_greedy(size_t *, size_t, size_t);
 70
 71static inline void *
 72kmem_zalloc(size_t size, xfs_km_flags_t flags)
 73{
 74	return kmem_alloc(size, flags | KM_ZERO);
 75}
 76
 77/*
 78 * Zone interfaces
 79 */
 80
 81#define KM_ZONE_HWALIGN	SLAB_HWCACHE_ALIGN
 82#define KM_ZONE_RECLAIM	SLAB_RECLAIM_ACCOUNT
 83#define KM_ZONE_SPREAD	SLAB_MEM_SPREAD
 84
 85#define kmem_zone	kmem_cache
 86#define kmem_zone_t	struct kmem_cache
 87
 88static inline kmem_zone_t *
 89kmem_zone_init(int size, char *zone_name)
 90{
 91	return kmem_cache_create(zone_name, size, 0, 0, NULL);
 92}
 93
 94static inline kmem_zone_t *
 95kmem_zone_init_flags(int size, char *zone_name, unsigned long flags,
 96		     void (*construct)(void *))
 97{
 98	return kmem_cache_create(zone_name, size, 0, flags, construct);
 99}
100
101static inline void
102kmem_zone_free(kmem_zone_t *zone, void *ptr)
103{
104	kmem_cache_free(zone, ptr);
105}
106
107static inline void
108kmem_zone_destroy(kmem_zone_t *zone)
109{
110	if (zone)
111		kmem_cache_destroy(zone);
112}
113
114extern void *kmem_zone_alloc(kmem_zone_t *, xfs_km_flags_t);
115
116static inline void *
117kmem_zone_zalloc(kmem_zone_t *zone, xfs_km_flags_t flags)
118{
119	return kmem_zone_alloc(zone, flags | KM_ZERO);
120}
121
122#endif /* __XFS_SUPPORT_KMEM_H__ */