openwrt/target/linux/generic/files/fs/yaffs2/yaffs_allocator.c

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/*
* YAFFS: Yet another Flash File System . A NAND-flash specific file system.
*
* Copyright (C) 2002-2010 Aleph One Ltd.
* for Toby Churchill Ltd and Brightstar Engineering
*
* Created by Charles Manning <charles@aleph1.co.uk>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License version 2.1 as
* published by the Free Software Foundation.
*
* Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
*/
#include "yaffs_allocator.h"
#include "yaffs_guts.h"
#include "yaffs_trace.h"
#include "yportenv.h"
#ifdef CONFIG_YAFFS_YMALLOC_ALLOCATOR
void yaffs_deinit_raw_tnodes_and_objs(yaffs_dev_t *dev)
{
dev = dev;
}
void yaffs_init_raw_tnodes_and_objs(yaffs_dev_t *dev)
{
dev = dev;
}
yaffs_tnode_t *yaffs_alloc_raw_tnode(yaffs_dev_t *dev)
{
return (yaffs_tnode_t *)YMALLOC(dev->tnode_size);
}
void yaffs_free_raw_tnode(yaffs_dev_t *dev, yaffs_tnode_t *tn)
{
dev = dev;
YFREE(tn);
}
void yaffs_init_raw_objs(yaffs_dev_t *dev)
{
dev = dev;
}
void yaffs_deinit_raw_objs(yaffs_dev_t *dev)
{
dev = dev;
}
yaffs_obj_t *yaffs_alloc_raw_obj(yaffs_dev_t *dev)
{
dev = dev;
return (yaffs_obj_t *) YMALLOC(sizeof(yaffs_obj_t));
}
void yaffs_free_raw_obj(yaffs_dev_t *dev, yaffs_obj_t *obj)
{
dev = dev;
YFREE(obj);
}
#else
struct yaffs_tnode_list {
struct yaffs_tnode_list *next;
yaffs_tnode_t *tnodes;
};
typedef struct yaffs_tnode_list yaffs_tnodelist_t;
struct yaffs_obj_tList_struct {
yaffs_obj_t *objects;
struct yaffs_obj_tList_struct *next;
};
typedef struct yaffs_obj_tList_struct yaffs_obj_tList;
struct yaffs_AllocatorStruct {
int n_tnodesCreated;
yaffs_tnode_t *freeTnodes;
int nFreeTnodes;
yaffs_tnodelist_t *allocatedTnodeList;
int n_objCreated;
yaffs_obj_t *freeObjects;
int nFreeObjects;
yaffs_obj_tList *allocatedObjectList;
};
typedef struct yaffs_AllocatorStruct yaffs_Allocator;
static void yaffs_deinit_raw_tnodes(yaffs_dev_t *dev)
{
yaffs_Allocator *allocator = (yaffs_Allocator *)dev->allocator;
yaffs_tnodelist_t *tmp;
if(!allocator){
YBUG();
return;
}
while (allocator->allocatedTnodeList) {
tmp = allocator->allocatedTnodeList->next;
YFREE(allocator->allocatedTnodeList->tnodes);
YFREE(allocator->allocatedTnodeList);
allocator->allocatedTnodeList = tmp;
}
allocator->freeTnodes = NULL;
allocator->nFreeTnodes = 0;
allocator->n_tnodesCreated = 0;
}
static void yaffs_init_raw_tnodes(yaffs_dev_t *dev)
{
yaffs_Allocator *allocator = dev->allocator;
if(allocator){
allocator->allocatedTnodeList = NULL;
allocator->freeTnodes = NULL;
allocator->nFreeTnodes = 0;
allocator->n_tnodesCreated = 0;
} else
YBUG();
}
static int yaffs_create_tnodes(yaffs_dev_t *dev, int n_tnodes)
{
yaffs_Allocator *allocator = (yaffs_Allocator *)dev->allocator;
int i;
yaffs_tnode_t *newTnodes;
__u8 *mem;
yaffs_tnode_t *curr;
yaffs_tnode_t *next;
yaffs_tnodelist_t *tnl;
if(!allocator){
YBUG();
return YAFFS_FAIL;
}
if (n_tnodes < 1)
return YAFFS_OK;
/* make these things */
newTnodes = YMALLOC(n_tnodes * dev->tnode_size);
mem = (__u8 *)newTnodes;
if (!newTnodes) {
T(YAFFS_TRACE_ERROR,
(TSTR("yaffs: Could not allocate Tnodes" TENDSTR)));
return YAFFS_FAIL;
}
/* New hookup for wide tnodes */
for (i = 0; i < n_tnodes - 1; i++) {
curr = (yaffs_tnode_t *) &mem[i * dev->tnode_size];
next = (yaffs_tnode_t *) &mem[(i+1) * dev->tnode_size];
curr->internal[0] = next;
}
curr = (yaffs_tnode_t *) &mem[(n_tnodes - 1) * dev->tnode_size];
curr->internal[0] = allocator->freeTnodes;
allocator->freeTnodes = (yaffs_tnode_t *)mem;
allocator->nFreeTnodes += n_tnodes;
allocator->n_tnodesCreated += n_tnodes;
/* Now add this bunch of tnodes to a list for freeing up.
* NB If we can't add this to the management list it isn't fatal
* but it just means we can't free this bunch of tnodes later.
*/
tnl = YMALLOC(sizeof(yaffs_tnodelist_t));
if (!tnl) {
T(YAFFS_TRACE_ERROR,
(TSTR
("yaffs: Could not add tnodes to management list" TENDSTR)));
return YAFFS_FAIL;
} else {
tnl->tnodes = newTnodes;
tnl->next = allocator->allocatedTnodeList;
allocator->allocatedTnodeList = tnl;
}
T(YAFFS_TRACE_ALLOCATE, (TSTR("yaffs: Tnodes added" TENDSTR)));
return YAFFS_OK;
}
yaffs_tnode_t *yaffs_alloc_raw_tnode(yaffs_dev_t *dev)
{
yaffs_Allocator *allocator = (yaffs_Allocator *)dev->allocator;
yaffs_tnode_t *tn = NULL;
if(!allocator){
YBUG();
return NULL;
}
/* If there are none left make more */
if (!allocator->freeTnodes)
yaffs_create_tnodes(dev, YAFFS_ALLOCATION_NTNODES);
if (allocator->freeTnodes) {
tn = allocator->freeTnodes;
allocator->freeTnodes = allocator->freeTnodes->internal[0];
allocator->nFreeTnodes--;
}
return tn;
}
/* FreeTnode frees up a tnode and puts it back on the free list */
void yaffs_free_raw_tnode(yaffs_dev_t *dev, yaffs_tnode_t *tn)
{
yaffs_Allocator *allocator = dev->allocator;
if(!allocator){
YBUG();
return;
}
if (tn) {
tn->internal[0] = allocator->freeTnodes;
allocator->freeTnodes = tn;
allocator->nFreeTnodes++;
}
dev->checkpoint_blocks_required = 0; /* force recalculation*/
}
static void yaffs_init_raw_objs(yaffs_dev_t *dev)
{
yaffs_Allocator *allocator = dev->allocator;
if(allocator) {
allocator->allocatedObjectList = NULL;
allocator->freeObjects = NULL;
allocator->nFreeObjects = 0;
} else
YBUG();
}
static void yaffs_deinit_raw_objs(yaffs_dev_t *dev)
{
yaffs_Allocator *allocator = dev->allocator;
yaffs_obj_tList *tmp;
if(!allocator){
YBUG();
return;
}
while (allocator->allocatedObjectList) {
tmp = allocator->allocatedObjectList->next;
YFREE(allocator->allocatedObjectList->objects);
YFREE(allocator->allocatedObjectList);
allocator->allocatedObjectList = tmp;
}
allocator->freeObjects = NULL;
allocator->nFreeObjects = 0;
allocator->n_objCreated = 0;
}
static int yaffs_create_free_objs(yaffs_dev_t *dev, int n_obj)
{
yaffs_Allocator *allocator = dev->allocator;
int i;
yaffs_obj_t *newObjects;
yaffs_obj_tList *list;
if(!allocator){
YBUG();
return YAFFS_FAIL;
}
if (n_obj < 1)
return YAFFS_OK;
/* make these things */
newObjects = YMALLOC(n_obj * sizeof(yaffs_obj_t));
list = YMALLOC(sizeof(yaffs_obj_tList));
if (!newObjects || !list) {
if (newObjects){
YFREE(newObjects);
newObjects = NULL;
}
if (list){
YFREE(list);
list = NULL;
}
T(YAFFS_TRACE_ALLOCATE,
(TSTR("yaffs: Could not allocate more objects" TENDSTR)));
return YAFFS_FAIL;
}
/* Hook them into the free list */
for (i = 0; i < n_obj - 1; i++) {
newObjects[i].siblings.next =
(struct ylist_head *)(&newObjects[i + 1]);
}
newObjects[n_obj - 1].siblings.next = (void *)allocator->freeObjects;
allocator->freeObjects = newObjects;
allocator->nFreeObjects += n_obj;
allocator->n_objCreated += n_obj;
/* Now add this bunch of Objects to a list for freeing up. */
list->objects = newObjects;
list->next = allocator->allocatedObjectList;
allocator->allocatedObjectList = list;
return YAFFS_OK;
}
yaffs_obj_t *yaffs_alloc_raw_obj(yaffs_dev_t *dev)
{
yaffs_obj_t *obj = NULL;
yaffs_Allocator *allocator = dev->allocator;
if(!allocator) {
YBUG();
return obj;
}
/* If there are none left make more */
if (!allocator->freeObjects)
yaffs_create_free_objs(dev, YAFFS_ALLOCATION_NOBJECTS);
if (allocator->freeObjects) {
obj = allocator->freeObjects;
allocator->freeObjects =
(yaffs_obj_t *) (allocator->freeObjects->siblings.next);
allocator->nFreeObjects--;
}
return obj;
}
void yaffs_free_raw_obj(yaffs_dev_t *dev, yaffs_obj_t *obj)
{
yaffs_Allocator *allocator = dev->allocator;
if(!allocator)
YBUG();
else {
/* Link into the free list. */
obj->siblings.next = (struct ylist_head *)(allocator->freeObjects);
allocator->freeObjects = obj;
allocator->nFreeObjects++;
}
}
void yaffs_deinit_raw_tnodes_and_objs(yaffs_dev_t *dev)
{
if(dev->allocator){
yaffs_deinit_raw_tnodes(dev);
yaffs_deinit_raw_objs(dev);
YFREE(dev->allocator);
dev->allocator=NULL;
} else
YBUG();
}
void yaffs_init_raw_tnodes_and_objs(yaffs_dev_t *dev)
{
yaffs_Allocator *allocator;
if(!dev->allocator){
allocator = YMALLOC(sizeof(yaffs_Allocator));
if(allocator){
dev->allocator = allocator;
yaffs_init_raw_tnodes(dev);
yaffs_init_raw_objs(dev);
}
} else
YBUG();
}
#endif