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 #define KM_SLEEP 0x0001u 31 #define KM_NOSLEEP 0x0002u 32 #define KM_NOFS 0x0004u 33 #define KM_MAYFAIL 0x0008u 34 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 */ 40 static inline gfp_t 41 kmem_flags_convert(unsigned int __nocast flags) 42 { 43 gfp_t lflags; 44 45 BUG_ON(flags & ~(KM_SLEEP|KM_NOSLEEP|KM_NOFS|KM_MAYFAIL)); 46 47 if (flags & KM_NOSLEEP) { 48 lflags = GFP_ATOMIC | __GFP_NOWARN; 49 } else { 50 lflags = GFP_KERNEL | __GFP_NOWARN; 51 if ((current->flags & PF_FSTRANS) || (flags & KM_NOFS)) 52 lflags &= ~__GFP_FS; 53 } 54 return lflags; 55 } 56 57 extern void *kmem_alloc(size_t, unsigned int __nocast); 58 extern void *kmem_zalloc(size_t, unsigned int __nocast); 59 extern void *kmem_realloc(const void *, size_t, size_t, unsigned int __nocast); 60 extern void kmem_free(const void *); 61 62 static inline void *kmem_zalloc_large(size_t size) 63 { 64 return vzalloc(size); 65 } 66 static inline void kmem_free_large(void *ptr) 67 { 68 vfree(ptr); 69 } 70 71 extern void *kmem_zalloc_greedy(size_t *, size_t, size_t); 72 73 /* 74 * Zone interfaces 75 */ 76 77 #define KM_ZONE_HWALIGN SLAB_HWCACHE_ALIGN 78 #define KM_ZONE_RECLAIM SLAB_RECLAIM_ACCOUNT 79 #define KM_ZONE_SPREAD SLAB_MEM_SPREAD 80 81 #define kmem_zone kmem_cache 82 #define kmem_zone_t struct kmem_cache 83 84 static inline kmem_zone_t * 85 kmem_zone_init(int size, char *zone_name) 86 { 87 return kmem_cache_create(zone_name, size, 0, 0, NULL); 88 } 89 90 static inline kmem_zone_t * 91 kmem_zone_init_flags(int size, char *zone_name, unsigned long flags, 92 void (*construct)(void *)) 93 { 94 return kmem_cache_create(zone_name, size, 0, flags, construct); 95 } 96 97 static inline void 98 kmem_zone_free(kmem_zone_t *zone, void *ptr) 99 { 100 kmem_cache_free(zone, ptr); 101 } 102 103 static inline void 104 kmem_zone_destroy(kmem_zone_t *zone) 105 { 106 if (zone) 107 kmem_cache_destroy(zone); 108 } 109 110 extern void *kmem_zone_alloc(kmem_zone_t *, unsigned int __nocast); 111 extern void *kmem_zone_zalloc(kmem_zone_t *, unsigned int __nocast); 112 113 static inline int 114 kmem_shake_allow(gfp_t gfp_mask) 115 { 116 return ((gfp_mask & __GFP_WAIT) && (gfp_mask & __GFP_FS)); 117 } 118 119 #endif /* __XFS_SUPPORT_KMEM_H__ */ 120