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 #include <linux/mm.h> 19 #include <linux/highmem.h> 20 #include <linux/slab.h> 21 #include <linux/swap.h> 22 #include <linux/blkdev.h> 23 #include <linux/backing-dev.h> 24 #include "time.h" 25 #include "kmem.h" 26 #include "xfs_message.h" 27 28 /* 29 * Greedy allocation. May fail and may return vmalloced memory. 30 * 31 * Must be freed using kmem_free_large. 32 */ 33 void * 34 kmem_zalloc_greedy(size_t *size, size_t minsize, size_t maxsize) 35 { 36 void *ptr; 37 size_t kmsize = maxsize; 38 39 while (!(ptr = kmem_zalloc_large(kmsize))) { 40 if ((kmsize >>= 1) <= minsize) 41 kmsize = minsize; 42 } 43 if (ptr) 44 *size = kmsize; 45 return ptr; 46 } 47 48 void * 49 kmem_alloc(size_t size, xfs_km_flags_t flags) 50 { 51 int retries = 0; 52 gfp_t lflags = kmem_flags_convert(flags); 53 void *ptr; 54 55 do { 56 ptr = kmalloc(size, lflags); 57 if (ptr || (flags & (KM_MAYFAIL|KM_NOSLEEP))) 58 return ptr; 59 if (!(++retries % 100)) 60 xfs_err(NULL, 61 "possible memory allocation deadlock in %s (mode:0x%x)", 62 __func__, lflags); 63 congestion_wait(BLK_RW_ASYNC, HZ/50); 64 } while (1); 65 } 66 67 void * 68 kmem_zalloc(size_t size, xfs_km_flags_t flags) 69 { 70 void *ptr; 71 72 ptr = kmem_alloc(size, flags); 73 if (ptr) 74 memset((char *)ptr, 0, (int)size); 75 return ptr; 76 } 77 78 void 79 kmem_free(const void *ptr) 80 { 81 if (!is_vmalloc_addr(ptr)) { 82 kfree(ptr); 83 } else { 84 vfree(ptr); 85 } 86 } 87 88 void * 89 kmem_realloc(const void *ptr, size_t newsize, size_t oldsize, 90 xfs_km_flags_t flags) 91 { 92 void *new; 93 94 new = kmem_alloc(newsize, flags); 95 if (ptr) { 96 if (new) 97 memcpy(new, ptr, 98 ((oldsize < newsize) ? oldsize : newsize)); 99 kmem_free(ptr); 100 } 101 return new; 102 } 103 104 void * 105 kmem_zone_alloc(kmem_zone_t *zone, xfs_km_flags_t flags) 106 { 107 int retries = 0; 108 gfp_t lflags = kmem_flags_convert(flags); 109 void *ptr; 110 111 do { 112 ptr = kmem_cache_alloc(zone, lflags); 113 if (ptr || (flags & (KM_MAYFAIL|KM_NOSLEEP))) 114 return ptr; 115 if (!(++retries % 100)) 116 xfs_err(NULL, 117 "possible memory allocation deadlock in %s (mode:0x%x)", 118 __func__, lflags); 119 congestion_wait(BLK_RW_ASYNC, HZ/50); 120 } while (1); 121 } 122 123 void * 124 kmem_zone_zalloc(kmem_zone_t *zone, xfs_km_flags_t flags) 125 { 126 void *ptr; 127 128 ptr = kmem_zone_alloc(zone, flags); 129 if (ptr) 130 memset((char *)ptr, 0, kmem_cache_size(zone)); 131 return ptr; 132 } 133