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