1 /* 2 * Copyright (c) 2000-2005 Silicon Graphics, Inc. 3 * All Rights Reserved. 4 * 5 * This program is free software; you can redistribute it and/or 6 * modify it under the terms of the GNU General Public License as 7 * published by the Free Software Foundation. 8 * 9 * 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. 13 * 14 * 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 17 */ 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 #include <linux/vmalloc.h> 25 26 /* 27 * General memory allocation interfaces 28 */ 29 30 typedef unsigned __bitwise xfs_km_flags_t; 31 #define KM_SLEEP ((__force xfs_km_flags_t)0x0001u) 32 #define KM_NOSLEEP ((__force xfs_km_flags_t)0x0002u) 33 #define KM_NOFS ((__force xfs_km_flags_t)0x0004u) 34 #define KM_MAYFAIL ((__force xfs_km_flags_t)0x0008u) 35 #define KM_ZERO ((__force xfs_km_flags_t)0x0010u) 36 37 /* 38 * We use a special process flag to avoid recursive callbacks into 39 * the filesystem during transactions. We will also issue our own 40 * warnings, so we explicitly skip any generic ones (silly of us). 41 */ 42 static inline gfp_t 43 kmem_flags_convert(xfs_km_flags_t flags) 44 { 45 gfp_t lflags; 46 47 BUG_ON(flags & ~(KM_SLEEP|KM_NOSLEEP|KM_NOFS|KM_MAYFAIL|KM_ZERO)); 48 49 if (flags & KM_NOSLEEP) { 50 lflags = GFP_ATOMIC | __GFP_NOWARN; 51 } else { 52 lflags = GFP_KERNEL | __GFP_NOWARN; 53 if ((current->flags & PF_FSTRANS) || (flags & KM_NOFS)) 54 lflags &= ~__GFP_FS; 55 } 56 57 if (flags & KM_ZERO) 58 lflags |= __GFP_ZERO; 59 60 return lflags; 61 } 62 63 extern void *kmem_alloc(size_t, xfs_km_flags_t); 64 extern void *kmem_zalloc_large(size_t size, xfs_km_flags_t); 65 extern void *kmem_realloc(const void *, size_t, size_t, xfs_km_flags_t); 66 extern void kmem_free(const void *); 67 68 69 extern void *kmem_zalloc_greedy(size_t *, size_t, size_t); 70 71 static inline void * 72 kmem_zalloc(size_t size, xfs_km_flags_t flags) 73 { 74 return kmem_alloc(size, flags | KM_ZERO); 75 } 76 77 /* 78 * Zone interfaces 79 */ 80 81 #define KM_ZONE_HWALIGN SLAB_HWCACHE_ALIGN 82 #define KM_ZONE_RECLAIM SLAB_RECLAIM_ACCOUNT 83 #define KM_ZONE_SPREAD SLAB_MEM_SPREAD 84 85 #define kmem_zone kmem_cache 86 #define kmem_zone_t struct kmem_cache 87 88 static inline kmem_zone_t * 89 kmem_zone_init(int size, char *zone_name) 90 { 91 return kmem_cache_create(zone_name, size, 0, 0, NULL); 92 } 93 94 static inline kmem_zone_t * 95 kmem_zone_init_flags(int size, char *zone_name, unsigned long flags, 96 void (*construct)(void *)) 97 { 98 return kmem_cache_create(zone_name, size, 0, flags, construct); 99 } 100 101 static inline void 102 kmem_zone_free(kmem_zone_t *zone, void *ptr) 103 { 104 kmem_cache_free(zone, ptr); 105 } 106 107 static inline void 108 kmem_zone_destroy(kmem_zone_t *zone) 109 { 110 if (zone) 111 kmem_cache_destroy(zone); 112 } 113 114 extern void *kmem_zone_alloc(kmem_zone_t *, xfs_km_flags_t); 115 116 static inline void * 117 kmem_zone_zalloc(kmem_zone_t *zone, xfs_km_flags_t flags) 118 { 119 return kmem_zone_alloc(zone, flags | KM_ZERO); 120 } 121 122 #endif /* __XFS_SUPPORT_KMEM_H__ */ 123