mirror of
https://github.com/torvalds/linux
synced 2024-11-05 18:23:50 +00:00
132 lines
2.8 KiB
C
132 lines
2.8 KiB
C
/*
|
|
* Copyright (c) 2000-2005 Silicon Graphics, Inc.
|
|
* All Rights Reserved.
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License as
|
|
* published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope that it would be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write the Free Software Foundation,
|
|
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
#include <linux/mm.h>
|
|
#include <linux/highmem.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/swap.h>
|
|
#include <linux/blkdev.h>
|
|
#include <linux/backing-dev.h>
|
|
#include "time.h"
|
|
#include "kmem.h"
|
|
#include "xfs_message.h"
|
|
|
|
/*
|
|
* Greedy allocation. May fail and may return vmalloced memory.
|
|
*
|
|
* Must be freed using kmem_free_large.
|
|
*/
|
|
void *
|
|
kmem_zalloc_greedy(size_t *size, size_t minsize, size_t maxsize)
|
|
{
|
|
void *ptr;
|
|
size_t kmsize = maxsize;
|
|
|
|
while (!(ptr = kmem_zalloc_large(kmsize))) {
|
|
if ((kmsize >>= 1) <= minsize)
|
|
kmsize = minsize;
|
|
}
|
|
if (ptr)
|
|
*size = kmsize;
|
|
return ptr;
|
|
}
|
|
|
|
void *
|
|
kmem_alloc(size_t size, xfs_km_flags_t flags)
|
|
{
|
|
int retries = 0;
|
|
gfp_t lflags = kmem_flags_convert(flags);
|
|
void *ptr;
|
|
|
|
do {
|
|
ptr = kmalloc(size, lflags);
|
|
if (ptr || (flags & (KM_MAYFAIL|KM_NOSLEEP)))
|
|
return ptr;
|
|
if (!(++retries % 100))
|
|
xfs_err(NULL,
|
|
"possible memory allocation deadlock in %s (mode:0x%x)",
|
|
__func__, lflags);
|
|
congestion_wait(BLK_RW_ASYNC, HZ/50);
|
|
} while (1);
|
|
}
|
|
|
|
void *
|
|
kmem_zalloc(size_t size, xfs_km_flags_t flags)
|
|
{
|
|
void *ptr;
|
|
|
|
ptr = kmem_alloc(size, flags);
|
|
if (ptr)
|
|
memset((char *)ptr, 0, (int)size);
|
|
return ptr;
|
|
}
|
|
|
|
void
|
|
kmem_free(const void *ptr)
|
|
{
|
|
if (!is_vmalloc_addr(ptr)) {
|
|
kfree(ptr);
|
|
} else {
|
|
vfree(ptr);
|
|
}
|
|
}
|
|
|
|
void *
|
|
kmem_realloc(const void *ptr, size_t newsize, size_t oldsize,
|
|
xfs_km_flags_t flags)
|
|
{
|
|
void *new;
|
|
|
|
new = kmem_alloc(newsize, flags);
|
|
if (ptr) {
|
|
if (new)
|
|
memcpy(new, ptr,
|
|
((oldsize < newsize) ? oldsize : newsize));
|
|
kmem_free(ptr);
|
|
}
|
|
return new;
|
|
}
|
|
|
|
void *
|
|
kmem_zone_alloc(kmem_zone_t *zone, xfs_km_flags_t flags)
|
|
{
|
|
int retries = 0;
|
|
gfp_t lflags = kmem_flags_convert(flags);
|
|
void *ptr;
|
|
|
|
do {
|
|
ptr = kmem_cache_alloc(zone, lflags);
|
|
if (ptr || (flags & (KM_MAYFAIL|KM_NOSLEEP)))
|
|
return ptr;
|
|
if (!(++retries % 100))
|
|
xfs_err(NULL,
|
|
"possible memory allocation deadlock in %s (mode:0x%x)",
|
|
__func__, lflags);
|
|
congestion_wait(BLK_RW_ASYNC, HZ/50);
|
|
} while (1);
|
|
}
|
|
|
|
void *
|
|
kmem_zone_zalloc(kmem_zone_t *zone, xfs_km_flags_t flags)
|
|
{
|
|
void *ptr;
|
|
|
|
ptr = kmem_zone_alloc(zone, flags);
|
|
if (ptr)
|
|
memset((char *)ptr, 0, kmem_cache_size(zone));
|
|
return ptr;
|
|
}
|