163 lines
4.0 KiB
C
163 lines
4.0 KiB
C
/*
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* Copyright (c) 2000-2005 Silicon Graphics, Inc.
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* All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms 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,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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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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* Process flags handling
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*/
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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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/*
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* General memory allocation interfaces
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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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/*
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* We use a special process flag to avoid recursive callbacks into
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* the filesystem during transactions. We will also issue our own
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* warnings, so we explicitly skip any generic ones (silly of us).
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*/
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static inline gfp_t
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kmem_flags_convert(unsigned int __nocast flags)
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{
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gfp_t lflags;
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BUG_ON(flags & ~(KM_SLEEP|KM_NOSLEEP|KM_NOFS|KM_MAYFAIL));
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if (flags & KM_NOSLEEP) {
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lflags = GFP_ATOMIC | __GFP_NOWARN;
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} else {
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lflags = GFP_KERNEL | __GFP_NOWARN;
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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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extern void *kmem_alloc(size_t, unsigned int __nocast);
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extern void *kmem_realloc(void *, size_t, size_t, unsigned int __nocast);
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extern void *kmem_zalloc(size_t, unsigned int __nocast);
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extern void kmem_free(void *, size_t);
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/*
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* Zone interfaces
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*/
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#define KM_ZONE_HWALIGN SLAB_HWCACHE_ALIGN
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#define KM_ZONE_RECLAIM SLAB_RECLAIM_ACCOUNT
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#define KM_ZONE_SPREAD 0
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#define kmem_zone kmem_cache
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#define kmem_zone_t struct kmem_cache
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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 kmem_zone_t *
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kmem_zone_init_flags(int size, char *zone_name, unsigned long flags,
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void (*construct)(void *, kmem_zone_t *, unsigned long))
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{
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return kmem_cache_create(zone_name, size, 0, flags, construct, 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_alloc(kmem_zone_t *, unsigned int __nocast);
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extern void *kmem_zone_zalloc(kmem_zone_t *, unsigned int __nocast);
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/*
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* Low memory cache shrinkers
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*/
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typedef struct shrinker *kmem_shaker_t;
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typedef int (*kmem_shake_func_t)(int, gfp_t);
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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(gfp_t 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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