/*

   * 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 ((current->flags & PF_FSTRANS) || (flags & KM_NOFS))

  			lflags &= ~__GFP_FS;
  	}

  
  	if (flags & KM_ZERO)
  		lflags |= __GFP_ZERO;

  	return lflags;

  }

  extern void *kmem_alloc(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, xfs_km_flags_t);

  static inline void  kmem_free(const void *ptr)
  {
  	kvfree(ptr);
  }

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

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

  
  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__ */