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 #ifdef DEBUG
  38         if (unlikely(!(flags & KM_LARGE) && (size > PAGE_SIZE))) {
  39                 printk(KERN_WARNING "Large %s attempt, size=%ld\n",
  40                         __FUNCTION__, (long)size);
  41                 dump_stack();
  42         }
  43 #endif
  44
  45         do {
  46                 if (size < MAX_SLAB_SIZE || retries > MAX_VMALLOCS)
  47                         ptr = kmalloc(size, lflags);
  48                 else
  49                         ptr = __vmalloc(size, lflags, PAGE_KERNEL);
  50                 if (ptr || (flags & (KM_MAYFAIL|KM_NOSLEEP)))
  51                         return ptr;
  52                 if (!(++retries % 100))
  53                         printk(KERN_ERR "XFS: possible memory allocation "
  54                                         "deadlock in %s (mode:0x%x)\n",
  55                                         __FUNCTION__, lflags);
  56                 blk_congestion_wait(WRITE, HZ/50);
  57         } while (1);
  58 }
  59
  60 void *
  61 kmem_zalloc(size_t size, unsigned int __nocast flags)
  62 {
  63         void    *ptr;
  64
  65         ptr = kmem_alloc(size, flags);
  66         if (ptr)
  67                 memset((char *)ptr, 0, (int)size);
  68         return ptr;
  69 }
  70
  71 void
  72 kmem_free(void *ptr, size_t size)
  73 {
  74         if (((unsigned long)ptr < VMALLOC_START) ||
  75             ((unsigned long)ptr >= VMALLOC_END)) {
  76                 kfree(ptr);
  77         } else {
  78                 vfree(ptr);
  79         }
  80 }
  81
  82 void *
  83 kmem_realloc(void *ptr, size_t newsize, size_t oldsize,
  84              unsigned int __nocast flags)
  85 {
  86         void    *new;
  87
  88         new = kmem_alloc(newsize, flags);
  89         if (ptr) {
  90                 if (new)
  91                         memcpy(new, ptr,
  92                                 ((oldsize < newsize) ? oldsize : newsize));
  93                 kmem_free(ptr, oldsize);
  94         }
  95         return new;
  96 }
  97
  98 void *
  99 kmem_zone_alloc(kmem_zone_t *zone, unsigned int __nocast flags)
 100 {
 101         int     retries = 0;
 102         gfp_t   lflags = kmem_flags_convert(flags);
 103         void    *ptr;
 104
 105         do {
 106                 ptr = kmem_cache_alloc(zone, lflags);
 107                 if (ptr || (flags & (KM_MAYFAIL|KM_NOSLEEP)))
 108                         return ptr;
 109                 if (!(++retries % 100))
 110                         printk(KERN_ERR "XFS: possible memory allocation "
 111                                         "deadlock in %s (mode:0x%x)\n",
 112                                         __FUNCTION__, lflags);
 113                 blk_congestion_wait(WRITE, HZ/50);
 114         } while (1);
 115 }
 116
 117 void *
 118 kmem_zone_zalloc(kmem_zone_t *zone, unsigned int __nocast flags)
 119 {
 120         void    *ptr;
 121
 122         ptr = kmem_zone_alloc(zone, flags);
 123         if (ptr)
 124                 memset((char *)ptr, 0, kmem_cache_size(zone));
 125         return ptr;
 126 }