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/*
* Copyright (C) 2001-2004 Sistina Software, Inc. All rights reserved.
* Copyright (C) 2004-2011 Red Hat, Inc. All rights reserved.
*
* This file is part of the device-mapper userspace tools.
*
* This copyrighted material is made available to anyone wishing to use,
* modify, copy, or redistribute it subject to the terms and conditions
* of the GNU Lesser General Public License v.2.1.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "device_mapper/misc/dmlib.h"
#include <sys/mman.h>
#include <pthread.h>
static DM_LIST_INIT(_dm_pools);
static pthread_mutex_t _dm_pools_mutex = PTHREAD_MUTEX_INITIALIZER;
void dm_pools_check_leaks(void);
#ifdef DEBUG_ENFORCE_POOL_LOCKING
#ifdef DEBUG_POOL
#error Do not use DEBUG_POOL with DEBUG_ENFORCE_POOL_LOCKING
#endif
/*
* Use mprotect system call to ensure all locked pages are not writable.
* Generates segmentation fault with write access to the locked pool.
*
* - Implementation is using posix_memalign() to get page aligned
* memory blocks (could be implemented also through malloc).
* - Only pool-fast is properly handled for now.
* - Checksum is slower compared to mprotect.
*/
static size_t _pagesize = 0;
static size_t _pagesize_mask = 0;
#define ALIGN_ON_PAGE(size) (((size) + (_pagesize_mask)) & ~(_pagesize_mask))
#endif
#ifdef DEBUG_POOL
#include "pool-debug.c"
#else
#include "pool-fast.c"
#endif
char *dm_pool_strdup(struct dm_pool *p, const char *str)
{
size_t len = strlen(str) + 1;
char *ret = dm_pool_alloc(p, len);
if (ret)
memcpy(ret, str, len);
return ret;
}
char *dm_pool_strndup(struct dm_pool *p, const char *str, size_t n)
{
size_t slen = strlen(str);
size_t len = (slen < n) ? slen : n;
char *ret = dm_pool_alloc(p, n + 1);
if (ret) {
ret[len] = '\0';
memcpy(ret, str, len);
}
return ret;
}
void *dm_pool_zalloc(struct dm_pool *p, size_t s)
{
void *ptr = dm_pool_alloc(p, s);
if (ptr)
memset(ptr, 0, s);
return ptr;
}
void dm_pools_check_leaks(void)
{
struct dm_pool *p;
pthread_mutex_lock(&_dm_pools_mutex);
if (dm_list_empty(&_dm_pools)) {
pthread_mutex_unlock(&_dm_pools_mutex);
return;
}
log_error("You have a memory leak (not released memory pool):");
dm_list_iterate_items(p, &_dm_pools) {
#ifdef DEBUG_POOL
log_error(" [%p] %s (%u bytes)",
p->orig_pool,
p->name, p->stats.bytes);
#else
log_error(" [%p] %s", (void *)p, p->name);
#endif
}
pthread_mutex_unlock(&_dm_pools_mutex);
log_error(INTERNAL_ERROR "Unreleased memory pool(s) found.");
}
/**
* Status of locked pool.
*
* \param p
* Pool to be tested for lock status.
*
* \return
* 1 when the pool is locked, 0 otherwise.
*/
int dm_pool_locked(struct dm_pool *p)
{
return p->locked;
}
/**
* Lock memory pool.
*
* \param p
* Pool to be locked.
*
* \param crc
* Bool specifies whether to store the pool crc/hash checksum.
*
* \return
* 1 (success) when the pool was properly locked, 0 otherwise.
*/
int dm_pool_lock(struct dm_pool *p, int crc)
{
if (p->locked) {
log_error(INTERNAL_ERROR "Pool %s is already locked.",
p->name);
return 0;
}
if (crc)
p->crc = _pool_crc(p); /* Get crc for pool */
if (!_pool_protect(p, PROT_READ)) {
_pool_protect(p, PROT_READ | PROT_WRITE);
return_0;
}
p->locked = 1;
log_debug_mem("Pool %s is locked.", p->name);
return 1;
}
/**
* Unlock memory pool.
*
* \param p
* Pool to be unlocked.
*
* \param crc
* Bool enables compare of the pool crc/hash with the stored value
* at pool lock. The pool is not properly unlocked if there is a mismatch.
*
* \return
* 1 (success) when the pool was properly unlocked, 0 otherwise.
*/
int dm_pool_unlock(struct dm_pool *p, int crc)
{
if (!p->locked) {
log_error(INTERNAL_ERROR "Pool %s is already unlocked.",
p->name);
return 0;
}
p->locked = 0;
if (!_pool_protect(p, PROT_READ | PROT_WRITE))
return_0;
log_debug_mem("Pool %s is unlocked.", p->name);
if (crc && (p->crc != _pool_crc(p))) {
log_error(INTERNAL_ERROR "Pool %s crc mismatch.", p->name);
return 0;
}
return 1;
}
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