158 lines
4.2 KiB
C
158 lines
4.2 KiB
C
/*
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* Copyright (c) 2000-2004 Silicon Graphics, Inc. All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of version 2 of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it would be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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*
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* Further, this software is distributed without any warranty that it is
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* free of the rightful claim of any third person regarding infringement
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* or the like. Any license provided herein, whether implied or
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* otherwise, applies only to this software file. Patent licenses, if
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* any, provided herein do not apply to combinations of this program with
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* other software, or any other product whatsoever.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write the Free Software Foundation, Inc., 59
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* Temple Place - Suite 330, Boston MA 02111-1307, USA.
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*
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* Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
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* Mountain View, CA 94043, or:
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*
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* http://www.sgi.com
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*
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* For further information regarding this notice, see:
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*
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* http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
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*/
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#ifndef __XFS_SUPPORT_KMEM_H__
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#define __XFS_SUPPORT_KMEM_H__
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#include <linux/slab.h>
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#include <linux/sched.h>
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#include <linux/mm.h>
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/*
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* memory management routines
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*/
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#define KM_SLEEP 0x0001u
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#define KM_NOSLEEP 0x0002u
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#define KM_NOFS 0x0004u
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#define KM_MAYFAIL 0x0008u
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#define kmem_zone kmem_cache_s
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#define kmem_zone_t kmem_cache_t
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typedef unsigned long xfs_pflags_t;
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#define PFLAGS_TEST_NOIO() (current->flags & PF_NOIO)
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#define PFLAGS_TEST_FSTRANS() (current->flags & PF_FSTRANS)
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#define PFLAGS_SET_NOIO() do { \
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current->flags |= PF_NOIO; \
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} while (0)
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#define PFLAGS_CLEAR_NOIO() do { \
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current->flags &= ~PF_NOIO; \
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} while (0)
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/* these could be nested, so we save state */
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#define PFLAGS_SET_FSTRANS(STATEP) do { \
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*(STATEP) = current->flags; \
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current->flags |= PF_FSTRANS; \
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} while (0)
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#define PFLAGS_CLEAR_FSTRANS(STATEP) do { \
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*(STATEP) = current->flags; \
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current->flags &= ~PF_FSTRANS; \
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} while (0)
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/* Restore the PF_FSTRANS state to what was saved in STATEP */
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#define PFLAGS_RESTORE_FSTRANS(STATEP) do { \
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current->flags = ((current->flags & ~PF_FSTRANS) | \
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(*(STATEP) & PF_FSTRANS)); \
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} while (0)
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#define PFLAGS_DUP(OSTATEP, NSTATEP) do { \
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*(NSTATEP) = *(OSTATEP); \
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} while (0)
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static __inline unsigned int kmem_flags_convert(gfp_t flags)
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{
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unsigned int lflags = __GFP_NOWARN; /* we'll report problems, if need be */
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#ifdef DEBUG
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if (unlikely(flags & ~(KM_SLEEP|KM_NOSLEEP|KM_NOFS|KM_MAYFAIL))) {
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printk(KERN_WARNING
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"XFS: memory allocation with wrong flags (%x)\n", flags);
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BUG();
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}
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#endif
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if (flags & KM_NOSLEEP) {
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lflags |= GFP_ATOMIC;
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} else {
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lflags |= GFP_KERNEL;
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/* avoid recusive callbacks to filesystem during transactions */
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if (PFLAGS_TEST_FSTRANS() || (flags & KM_NOFS))
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lflags &= ~__GFP_FS;
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}
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return lflags;
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}
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static __inline kmem_zone_t *
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kmem_zone_init(int size, char *zone_name)
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{
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return kmem_cache_create(zone_name, size, 0, 0, NULL, NULL);
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}
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static __inline void
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kmem_zone_free(kmem_zone_t *zone, void *ptr)
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{
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kmem_cache_free(zone, ptr);
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}
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static __inline void
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kmem_zone_destroy(kmem_zone_t *zone)
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{
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if (zone && kmem_cache_destroy(zone))
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BUG();
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}
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extern void *kmem_zone_zalloc(kmem_zone_t *, gfp_t);
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extern void *kmem_zone_alloc(kmem_zone_t *, gfp_t);
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extern void *kmem_alloc(size_t, gfp_t);
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extern void *kmem_realloc(void *, size_t, size_t, gfp_t);
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extern void *kmem_zalloc(size_t, gfp_t);
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extern void kmem_free(void *, size_t);
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typedef struct shrinker *kmem_shaker_t;
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typedef int (*kmem_shake_func_t)(int, unsigned int);
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static __inline kmem_shaker_t
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kmem_shake_register(kmem_shake_func_t sfunc)
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{
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return set_shrinker(DEFAULT_SEEKS, sfunc);
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}
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static __inline void
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kmem_shake_deregister(kmem_shaker_t shrinker)
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{
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remove_shrinker(shrinker);
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}
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static __inline int
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kmem_shake_allow(unsigned int gfp_mask)
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{
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return (gfp_mask & __GFP_WAIT);
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}
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#endif /* __XFS_SUPPORT_KMEM_H__ */
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