fs/xfs/linux-2.6/kmem.c

   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/sched.h>
  19 #include <linux/mm.h>
  20 #include <linux/vmalloc.h>
  21 #include <linux/highmem.h>
  22 #include <linux/swap.h>
  23 #include <linux/blkdev.h>
  24 #include "time.h"
  25 #include "kmem.h"
  26
  27 #define MAX_VMALLOCS    6
  28 #define MAX_SLAB_SIZE   0x20000
  29
  30
  31 void *
  32 kmem_alloc(size_t size, unsigned int __nocast flags)
  33 {
  34         int     retries = 0;
  35         gfp_t   lflags = kmem_flags_convert(flags);
  36         void    *ptr;
  37
  38         do {
  39                 if (size < MAX_SLAB_SIZE || retries > MAX_VMALLOCS)
  40                         ptr = kmalloc(size, lflags);
  41                 else
  42                         ptr = __vmalloc(size, lflags, PAGE_KERNEL);
  43                 if (ptr || (flags & (KM_MAYFAIL|KM_NOSLEEP)))
  44                         return ptr;
  45                 if (!(++retries % 100))
  46                         printk(KERN_ERR "XFS: possible memory allocation "
  47                                         "deadlock in %s (mode:0x%x)\n",
  48                                         __FUNCTION__, lflags);
  49                 blk_congestion_wait(WRITE, HZ/50);
  50         } while (1);
  51 }
  52
  53 void *
  54 kmem_zalloc(size_t size, unsigned int __nocast flags)
  55 {
  56         void    *ptr;
  57
  58         ptr = kmem_alloc(size, flags);
  59         if (ptr)
  60                 memset((char *)ptr, 0, (int)size);
  61         return ptr;
  62 }
  63
  64 void
  65 kmem_free(void *ptr, size_t size)
  66 {
  67         if (((unsigned long)ptr < VMALLOC_START) ||
  68             ((unsigned long)ptr >= VMALLOC_END)) {
  69                 kfree(ptr);
  70         } else {
  71                 vfree(ptr);
  72         }
  73 }
  74
  75 void *
  76 kmem_realloc(void *ptr, size_t newsize, size_t oldsize,
  77              unsigned int __nocast flags)
  78 {
  79         void    *new;
  80
  81         new = kmem_alloc(newsize, flags);
  82         if (ptr) {
  83                 if (new)
  84                         memcpy(new, ptr,
  85                                 ((oldsize < newsize) ? oldsize : newsize));
  86                 kmem_free(ptr, oldsize);
  87         }
  88         return new;
  89 }
  90
  91 void *
  92 kmem_zone_alloc(kmem_zone_t *zone, unsigned int __nocast flags)
  93 {
  94         int     retries = 0;
  95         gfp_t   lflags = kmem_flags_convert(flags);
  96         void    *ptr;
  97
  98         do {
  99                 ptr = kmem_cache_alloc(zone, lflags);
 100                 if (ptr || (flags & (KM_MAYFAIL|KM_NOSLEEP)))
 101                         return ptr;
 102                 if (!(++retries % 100))
 103                         printk(KERN_ERR "XFS: possible memory allocation "
 104                                         "deadlock in %s (mode:0x%x)\n",
 105                                         __FUNCTION__, lflags);
 106                 blk_congestion_wait(WRITE, HZ/50);
 107         } while (1);
 108 }
 109
 110 void *
 111 kmem_zone_zalloc(kmem_zone_t *zone, unsigned int __nocast flags)
 112 {
 113         void    *ptr;
 114
 115         ptr = kmem_zone_alloc(zone, flags);
 116         if (ptr)
 117                 memset((char *)ptr, 0, kmem_cache_size(zone));
 118         return ptr;
 119 }