664b60f6ba
Use krealloc to implement our realloc function. This helps to avoid new allocations if we are still in the slab bucket. At least for the bmap btree root that's actually the common case. This also allows removing the now unused oldsize argument. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Brian Foster <bfoster@redhat.com> Signed-off-by: Dave Chinner <david@fromorbit.com>
127 lines
3.2 KiB
C
127 lines
3.2 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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#include <linux/vmalloc.h>
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/*
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* General memory allocation interfaces
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*/
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typedef unsigned __bitwise xfs_km_flags_t;
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#define KM_SLEEP ((__force xfs_km_flags_t)0x0001u)
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#define KM_NOSLEEP ((__force xfs_km_flags_t)0x0002u)
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#define KM_NOFS ((__force xfs_km_flags_t)0x0004u)
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#define KM_MAYFAIL ((__force xfs_km_flags_t)0x0008u)
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#define KM_ZERO ((__force xfs_km_flags_t)0x0010u)
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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(xfs_km_flags_t 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|KM_ZERO));
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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 ((current->flags & PF_FSTRANS) || (flags & KM_NOFS))
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lflags &= ~__GFP_FS;
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}
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if (flags & KM_ZERO)
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lflags |= __GFP_ZERO;
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return lflags;
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}
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extern void *kmem_alloc(size_t, xfs_km_flags_t);
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extern void *kmem_zalloc_large(size_t size, xfs_km_flags_t);
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extern void *kmem_realloc(const void *, size_t, xfs_km_flags_t);
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static inline void kmem_free(const void *ptr)
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{
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kvfree(ptr);
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}
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extern void *kmem_zalloc_greedy(size_t *, size_t, size_t);
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static inline void *
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kmem_zalloc(size_t size, xfs_km_flags_t flags)
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{
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return kmem_alloc(size, flags | KM_ZERO);
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}
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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 SLAB_MEM_SPREAD
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#define KM_ZONE_ACCOUNT SLAB_ACCOUNT
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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);
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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 *))
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{
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return kmem_cache_create(zone_name, size, 0, flags, construct);
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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)
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kmem_cache_destroy(zone);
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}
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extern void *kmem_zone_alloc(kmem_zone_t *, xfs_km_flags_t);
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static inline void *
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kmem_zone_zalloc(kmem_zone_t *zone, xfs_km_flags_t flags)
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{
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return kmem_zone_alloc(zone, flags | KM_ZERO);
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}
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#endif /* __XFS_SUPPORT_KMEM_H__ */
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