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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Nathan Scott7b718762005-11-02 14:58:39 +11002 * Copyright (c) 2000-2005 Silicon Graphics, Inc.
3 * All Rights Reserved.
Linus Torvalds1da177e2005-04-16 15:20:36 -07004 *
Nathan Scott7b718762005-11-02 14:58:39 +11005 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License as
Linus Torvalds1da177e2005-04-16 15:20:36 -07007 * published by the Free Software Foundation.
8 *
Nathan Scott7b718762005-11-02 14:58:39 +11009 * 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.
Linus Torvalds1da177e2005-04-16 15:20:36 -070013 *
Nathan Scott7b718762005-11-02 14:58:39 +110014 * 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
Linus Torvalds1da177e2005-04-16 15:20:36 -070017 */
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
25/*
Nathan Scott87582802006-03-14 13:18:19 +110026 * General memory allocation interfaces
27 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070028
Nathan Scott87582802006-03-14 13:18:19 +110029#define KM_SLEEP 0x0001u
30#define KM_NOSLEEP 0x0002u
31#define KM_NOFS 0x0004u
32#define KM_MAYFAIL 0x0008u
Nathan Scottefb8ad72006-09-28 11:03:05 +100033#define KM_LARGE 0x0010u
Nathan Scott87582802006-03-14 13:18:19 +110034
35/*
36 * We use a special process flag to avoid recursive callbacks into
37 * the filesystem during transactions. We will also issue our own
38 * warnings, so we explicitly skip any generic ones (silly of us).
39 */
40static inline gfp_t
41kmem_flags_convert(unsigned int __nocast flags)
42{
43 gfp_t lflags;
44
Nathan Scottefb8ad72006-09-28 11:03:05 +100045 BUG_ON(flags & ~(KM_SLEEP|KM_NOSLEEP|KM_NOFS|KM_MAYFAIL|KM_LARGE));
Linus Torvalds1da177e2005-04-16 15:20:36 -070046
47 if (flags & KM_NOSLEEP) {
Nathan Scott87582802006-03-14 13:18:19 +110048 lflags = GFP_ATOMIC | __GFP_NOWARN;
Linus Torvalds1da177e2005-04-16 15:20:36 -070049 } else {
Nathan Scott87582802006-03-14 13:18:19 +110050 lflags = GFP_KERNEL | __GFP_NOWARN;
Nathan Scott59c1b082006-06-09 14:59:13 +100051 if ((current->flags & PF_FSTRANS) || (flags & KM_NOFS))
Linus Torvalds1da177e2005-04-16 15:20:36 -070052 lflags &= ~__GFP_FS;
53 }
Nathan Scott87582802006-03-14 13:18:19 +110054 return lflags;
Linus Torvalds1da177e2005-04-16 15:20:36 -070055}
56
Nathan Scott7f248a82005-11-03 16:14:31 +110057extern void *kmem_alloc(size_t, unsigned int __nocast);
Nathan Scott7f248a82005-11-03 16:14:31 +110058extern void *kmem_zalloc(size_t, unsigned int __nocast);
Nathan Scott77e46352006-09-28 11:03:27 +100059extern void *kmem_zalloc_greedy(size_t *, size_t, size_t, unsigned int __nocast);
60extern void *kmem_realloc(void *, size_t, size_t, unsigned int __nocast);
Nathan Scott7f248a82005-11-03 16:14:31 +110061extern void kmem_free(void *, size_t);
Linus Torvalds1da177e2005-04-16 15:20:36 -070062
Nathan Scott87582802006-03-14 13:18:19 +110063/*
64 * Zone interfaces
65 */
66
67#define KM_ZONE_HWALIGN SLAB_HWCACHE_ALIGN
68#define KM_ZONE_RECLAIM SLAB_RECLAIM_ACCOUNT
Paul Jacksonb0196002006-03-24 03:16:09 -080069#define KM_ZONE_SPREAD SLAB_MEM_SPREAD
Nathan Scott87582802006-03-14 13:18:19 +110070
71#define kmem_zone kmem_cache
72#define kmem_zone_t struct kmem_cache
73
74static inline kmem_zone_t *
75kmem_zone_init(int size, char *zone_name)
76{
Paul Mundt20c2df82007-07-20 10:11:58 +090077 return kmem_cache_create(zone_name, size, 0, 0, NULL);
Nathan Scott87582802006-03-14 13:18:19 +110078}
79
80static inline kmem_zone_t *
81kmem_zone_init_flags(int size, char *zone_name, unsigned long flags,
Alexey Dobriyan51cc5062008-07-25 19:45:34 -070082 void (*construct)(void *))
Nathan Scott87582802006-03-14 13:18:19 +110083{
Paul Mundt20c2df82007-07-20 10:11:58 +090084 return kmem_cache_create(zone_name, size, 0, flags, construct);
Nathan Scott87582802006-03-14 13:18:19 +110085}
86
87static inline void
88kmem_zone_free(kmem_zone_t *zone, void *ptr)
89{
90 kmem_cache_free(zone, ptr);
91}
92
93static inline void
94kmem_zone_destroy(kmem_zone_t *zone)
95{
Alexey Dobriyan1a1d92c2006-09-27 01:49:40 -070096 if (zone)
97 kmem_cache_destroy(zone);
Nathan Scott87582802006-03-14 13:18:19 +110098}
99
100extern void *kmem_zone_alloc(kmem_zone_t *, unsigned int __nocast);
101extern void *kmem_zone_zalloc(kmem_zone_t *, unsigned int __nocast);
102
Nathan Scott87582802006-03-14 13:18:19 +1100103static inline int
Al Viro27496a82005-10-21 03:20:48 -0400104kmem_shake_allow(gfp_t gfp_mask)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105{
Christoph Hellwig34521c52007-08-16 15:37:57 +1000106 return (gfp_mask & __GFP_WAIT) != 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107}
108
109#endif /* __XFS_SUPPORT_KMEM_H__ */