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 36 /* 37 * We use a special process flag to avoid recursive callbacks into 38 * the filesystem during transactions. We will also issue our own 39 * warnings, so we explicitly skip any generic ones (silly of us). 40 */ 41 static inline gfp_t 42 kmem_flags_convert(xfs_km_flags_t flags) 43 { 44 gfp_t lflags; 45 46 BUG_ON(flags & ~(KM_SLEEP|KM_NOSLEEP|KM_NOFS|KM_MAYFAIL)); 47 48 if (flags & KM_NOSLEEP) { 49 lflags = GFP_ATOMIC | __GFP_NOWARN; 50 } else { 51 lflags = GFP_KERNEL | __GFP_NOWARN; 52 if ((current->flags & PF_FSTRANS) || (flags & KM_NOFS)) 53 lflags &= ~__GFP_FS; 54 } 55 return lflags; 56 } 57 58 extern void *kmem_alloc(size_t, xfs_km_flags_t); 59 extern void *kmem_zalloc(size_t, xfs_km_flags_t); 60 extern void *kmem_realloc(const void *, size_t, size_t, xfs_km_flags_t); 61 extern void kmem_free(const void *); 62 63 static inline void *kmem_zalloc_large(size_t size) 64 { 65 return vzalloc(size); 66 } 67 static inline void kmem_free_large(void *ptr) 68 { 69 vfree(ptr); 70 } 71 72 extern void *kmem_zalloc_greedy(size_t *, size_t, size_t); 73 74 /* 75 * Zone interfaces 76 */ 77 78 #define KM_ZONE_HWALIGN SLAB_HWCACHE_ALIGN 79 #define KM_ZONE_RECLAIM SLAB_RECLAIM_ACCOUNT 80 #define KM_ZONE_SPREAD SLAB_MEM_SPREAD 81 82 #define kmem_zone kmem_cache 83 #define kmem_zone_t struct kmem_cache 84 85 static inline kmem_zone_t * 86 kmem_zone_init(int size, char *zone_name) 87 { 88 return kmem_cache_create(zone_name, size, 0, 0, NULL); 89 } 90 91 static inline kmem_zone_t * 92 kmem_zone_init_flags(int size, char *zone_name, unsigned long flags, 93 void (*construct)(void *)) 94 { 95 return kmem_cache_create(zone_name, size, 0, flags, construct); 96 } 97 98 static inline void 99 kmem_zone_free(kmem_zone_t *zone, void *ptr) 100 { 101 kmem_cache_free(zone, ptr); 102 } 103 104 static inline void 105 kmem_zone_destroy(kmem_zone_t *zone) 106 { 107 if (zone) 108 kmem_cache_destroy(zone); 109 } 110 111 extern void *kmem_zone_alloc(kmem_zone_t *, xfs_km_flags_t); 112 extern void *kmem_zone_zalloc(kmem_zone_t *, xfs_km_flags_t); 113 114 #endif /* __XFS_SUPPORT_KMEM_H__ */ 115