fs/xfs/linux-2.6/kmem.c

   1 /*
   2  * Copyright (c) 2000-2004 Silicon Graphics, Inc.  All Rights Reserved.
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms of version 2 of the GNU General Public License as
   6  * published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it would be useful, but
   9  * WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  11  *
  12  * Further, this software is distributed without any warranty that it is
  13  * free of the rightful claim of any third person regarding infringement
  14  * or the like.  Any license provided herein, whether implied or
  15  * otherwise, applies only to this software file.  Patent licenses, if
  16  * any, provided herein do not apply to combinations of this program with
  17  * other software, or any other product whatsoever.
  18  *
  19  * You should have received a copy of the GNU General Public License along
  20  * with this program; if not, write the Free Software Foundation, Inc., 59
  21  * Temple Place - Suite 330, Boston MA 02111-1307, USA.
  22  *
  23  * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
  24  * Mountain View, CA  94043, or:
  25  *
  26  * http://www.sgi.com
  27  *
  28  * For further information regarding this notice, see:
  29  *
  30  * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
  31  */
  32
  33 #include <linux/sched.h>
  34 #include <linux/mm.h>
  35 #include <linux/vmalloc.h>
  36 #include <linux/highmem.h>
  37 #include <linux/swap.h>
  38 #include <linux/blkdev.h>
  39
  40 #include "time.h"
  41 #include "kmem.h"
  42
  43 #define MAX_VMALLOCS    6
  44 #define MAX_SLAB_SIZE   0x20000
  45
  46
  47 void *
  48 kmem_alloc(size_t size, int flags)
  49 {
  50         int     retries = 0;
  51         int     lflags = kmem_flags_convert(flags);
  52         void    *ptr;
  53
  54         do {
  55                 if (size < MAX_SLAB_SIZE || retries > MAX_VMALLOCS)
  56                         ptr = kmalloc(size, lflags);
  57                 else
  58                         ptr = __vmalloc(size, lflags, PAGE_KERNEL);
  59                 if (ptr || (flags & (KM_MAYFAIL|KM_NOSLEEP)))
  60                         return ptr;
  61                 if (!(++retries % 100))
  62                         printk(KERN_ERR "XFS: possible memory allocation "
  63                                         "deadlock in %s (mode:0x%x)\n",
  64                                         __FUNCTION__, lflags);
  65                 blk_congestion_wait(WRITE, HZ/50);
  66         } while (1);
  67 }
  68
  69 void *
  70 kmem_zalloc(size_t size, int flags)
  71 {
  72         void    *ptr;
  73
  74         ptr = kmem_alloc(size, flags);
  75         if (ptr)
  76                 memset((char *)ptr, 0, (int)size);
  77         return ptr;
  78 }
  79
  80 void
  81 kmem_free(void *ptr, size_t size)
  82 {
  83         if (((unsigned long)ptr < VMALLOC_START) ||
  84             ((unsigned long)ptr >= VMALLOC_END)) {
  85                 kfree(ptr);
  86         } else {
  87                 vfree(ptr);
  88         }
  89 }
  90
  91 void *
  92 kmem_realloc(void *ptr, size_t newsize, size_t oldsize, int flags)
  93 {
  94         void    *new;
  95
  96         new = kmem_alloc(newsize, flags);
  97         if (ptr) {
  98                 if (new)
  99                         memcpy(new, ptr,
 100                                 ((oldsize < newsize) ? oldsize : newsize));
 101                 kmem_free(ptr, oldsize);
 102         }
 103         return new;
 104 }
 105
 106 void *
 107 kmem_zone_alloc(kmem_zone_t *zone, int flags)
 108 {
 109         int     retries = 0;
 110         int     lflags = kmem_flags_convert(flags);
 111         void    *ptr;
 112
 113         do {
 114                 ptr = kmem_cache_alloc(zone, lflags);
 115                 if (ptr || (flags & (KM_MAYFAIL|KM_NOSLEEP)))
 116                         return ptr;
 117                 if (!(++retries % 100))
 118                         printk(KERN_ERR "XFS: possible memory allocation "
 119                                         "deadlock in %s (mode:0x%x)\n",
 120                                         __FUNCTION__, lflags);
 121                 blk_congestion_wait(WRITE, HZ/50);
 122         } while (1);
 123 }
 124
 125 void *
 126 kmem_zone_zalloc(kmem_zone_t *zone, int flags)
 127 {
 128         void    *ptr;
 129
 130         ptr = kmem_zone_alloc(zone, flags);
 131         if (ptr)
 132                 memset((char *)ptr, 0, kmem_cache_size(zone));
 133         return ptr;
 134 }