2 * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
4 * Copyright (C) 2002-2010 Aleph One Ltd.
5 * for Toby Churchill Ltd and Brightstar Engineering
7 * Created by Charles Manning <charles@aleph1.co.uk>
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
14 #include "yaffs_allocator.h"
15 #include "yaffs_guts.h"
16 #include "yaffs_trace.h"
19 #ifdef CONFIG_YAFFS_KMALLOC_ALLOCATOR
20 /* This is an alternative debug allocator. Don't use for production code. */
22 void yaffs_deinit_raw_tnodes_and_objs(struct yaffs_dev *dev)
27 void yaffs_init_raw_tnodes_and_objs(struct yaffs_dev *dev)
32 struct yaffs_tnode *yaffs_alloc_raw_tnode(struct yaffs_dev *dev)
34 return kmalloc(dev->tnode_size, GFP_NOFS);
37 void yaffs_free_raw_tnode(struct yaffs_dev *dev, struct yaffs_tnode *tn)
43 void yaffs_init_raw_objs(struct yaffs_dev *dev)
48 void yaffs_deinit_raw_objs(struct yaffs_dev *dev)
53 struct yaffs_obj *yaffs_alloc_raw_obj(struct yaffs_dev *dev)
56 return kmalloc(sizeof(struct yaffs_obj));
59 void yaffs_free_raw_obj(struct yaffs_dev *dev, struct yaffs_obj *obj)
68 struct yaffs_tnode_list {
69 struct yaffs_tnode_list *next;
70 struct yaffs_tnode *tnodes;
73 struct yaffs_obj_list {
74 struct yaffs_obj_list *next;
75 struct yaffs_obj *objects;
78 struct yaffs_allocator {
80 struct yaffs_tnode *free_tnodes;
82 struct yaffs_tnode_list *alloc_tnode_list;
85 struct yaffs_obj *free_objs;
88 struct yaffs_obj_list *allocated_obj_list;
91 static void yaffs_deinit_raw_tnodes(struct yaffs_dev *dev)
93 struct yaffs_allocator *allocator =
94 (struct yaffs_allocator *)dev->allocator;
95 struct yaffs_tnode_list *tmp;
102 while (allocator->alloc_tnode_list) {
103 tmp = allocator->alloc_tnode_list->next;
105 kfree(allocator->alloc_tnode_list->tnodes);
106 kfree(allocator->alloc_tnode_list);
107 allocator->alloc_tnode_list = tmp;
110 allocator->free_tnodes = NULL;
111 allocator->n_free_tnodes = 0;
112 allocator->n_tnodes_created = 0;
115 static void yaffs_init_raw_tnodes(struct yaffs_dev *dev)
117 struct yaffs_allocator *allocator = dev->allocator;
120 allocator->alloc_tnode_list = NULL;
121 allocator->free_tnodes = NULL;
122 allocator->n_free_tnodes = 0;
123 allocator->n_tnodes_created = 0;
129 static int yaffs_create_tnodes(struct yaffs_dev *dev, int n_tnodes)
131 struct yaffs_allocator *allocator =
132 (struct yaffs_allocator *)dev->allocator;
134 struct yaffs_tnode *new_tnodes;
136 struct yaffs_tnode *curr;
137 struct yaffs_tnode *next;
138 struct yaffs_tnode_list *tnl;
148 /* make these things */
149 new_tnodes = kmalloc(n_tnodes * dev->tnode_size, GFP_NOFS);
150 mem = (u8 *) new_tnodes;
153 yaffs_trace(YAFFS_TRACE_ERROR,
154 "yaffs: Could not allocate Tnodes");
158 /* New hookup for wide tnodes */
159 for (i = 0; i < n_tnodes - 1; i++) {
160 curr = (struct yaffs_tnode *)&mem[i * dev->tnode_size];
161 next = (struct yaffs_tnode *)&mem[(i + 1) * dev->tnode_size];
162 curr->internal[0] = next;
165 curr = (struct yaffs_tnode *)&mem[(n_tnodes - 1) * dev->tnode_size];
166 curr->internal[0] = allocator->free_tnodes;
167 allocator->free_tnodes = (struct yaffs_tnode *)mem;
169 allocator->n_free_tnodes += n_tnodes;
170 allocator->n_tnodes_created += n_tnodes;
172 /* Now add this bunch of tnodes to a list for freeing up.
173 * NB If we can't add this to the management list it isn't fatal
174 * but it just means we can't free this bunch of tnodes later.
176 tnl = kmalloc(sizeof(struct yaffs_tnode_list), GFP_NOFS);
178 yaffs_trace(YAFFS_TRACE_ERROR,
179 "Could not add tnodes to management list");
182 tnl->tnodes = new_tnodes;
183 tnl->next = allocator->alloc_tnode_list;
184 allocator->alloc_tnode_list = tnl;
187 yaffs_trace(YAFFS_TRACE_ALLOCATE, "Tnodes added");
192 struct yaffs_tnode *yaffs_alloc_raw_tnode(struct yaffs_dev *dev)
194 struct yaffs_allocator *allocator =
195 (struct yaffs_allocator *)dev->allocator;
196 struct yaffs_tnode *tn = NULL;
203 /* If there are none left make more */
204 if (!allocator->free_tnodes)
205 yaffs_create_tnodes(dev, YAFFS_ALLOCATION_NTNODES);
207 if (allocator->free_tnodes) {
208 tn = allocator->free_tnodes;
209 allocator->free_tnodes = allocator->free_tnodes->internal[0];
210 allocator->n_free_tnodes--;
216 /* FreeTnode frees up a tnode and puts it back on the free list */
217 void yaffs_free_raw_tnode(struct yaffs_dev *dev, struct yaffs_tnode *tn)
219 struct yaffs_allocator *allocator = dev->allocator;
227 tn->internal[0] = allocator->free_tnodes;
228 allocator->free_tnodes = tn;
229 allocator->n_free_tnodes++;
231 dev->checkpoint_blocks_required = 0; /* force recalculation */
234 static void yaffs_init_raw_objs(struct yaffs_dev *dev)
236 struct yaffs_allocator *allocator = dev->allocator;
239 allocator->allocated_obj_list = NULL;
240 allocator->free_objs = NULL;
241 allocator->n_free_objects = 0;
247 static void yaffs_deinit_raw_objs(struct yaffs_dev *dev)
249 struct yaffs_allocator *allocator = dev->allocator;
250 struct yaffs_obj_list *tmp;
257 while (allocator->allocated_obj_list) {
258 tmp = allocator->allocated_obj_list->next;
259 kfree(allocator->allocated_obj_list->objects);
260 kfree(allocator->allocated_obj_list);
262 allocator->allocated_obj_list = tmp;
265 allocator->free_objs = NULL;
266 allocator->n_free_objects = 0;
267 allocator->n_obj_created = 0;
270 static int yaffs_create_free_objs(struct yaffs_dev *dev, int n_obj)
272 struct yaffs_allocator *allocator = dev->allocator;
274 struct yaffs_obj *new_objs;
275 struct yaffs_obj_list *list;
285 /* make these things */
286 new_objs = kmalloc(n_obj * sizeof(struct yaffs_obj), GFP_NOFS);
287 list = kmalloc(sizeof(struct yaffs_obj_list), GFP_NOFS);
289 if (!new_objs || !list) {
294 yaffs_trace(YAFFS_TRACE_ALLOCATE,
295 "Could not allocate more objects");
299 /* Hook them into the free list */
300 for (i = 0; i < n_obj - 1; i++) {
301 new_objs[i].siblings.next =
302 (struct list_head *)(&new_objs[i + 1]);
305 new_objs[n_obj - 1].siblings.next = (void *)allocator->free_objs;
306 allocator->free_objs = new_objs;
307 allocator->n_free_objects += n_obj;
308 allocator->n_obj_created += n_obj;
310 /* Now add this bunch of Objects to a list for freeing up. */
312 list->objects = new_objs;
313 list->next = allocator->allocated_obj_list;
314 allocator->allocated_obj_list = list;
319 struct yaffs_obj *yaffs_alloc_raw_obj(struct yaffs_dev *dev)
321 struct yaffs_obj *obj = NULL;
322 struct yaffs_allocator *allocator = dev->allocator;
329 /* If there are none left make more */
330 if (!allocator->free_objs)
331 yaffs_create_free_objs(dev, YAFFS_ALLOCATION_NOBJECTS);
333 if (allocator->free_objs) {
334 obj = allocator->free_objs;
335 allocator->free_objs =
336 (struct yaffs_obj *)(allocator->free_objs->siblings.next);
337 allocator->n_free_objects--;
343 void yaffs_free_raw_obj(struct yaffs_dev *dev, struct yaffs_obj *obj)
346 struct yaffs_allocator *allocator = dev->allocator;
351 /* Link into the free list. */
352 obj->siblings.next = (struct list_head *)(allocator->free_objs);
353 allocator->free_objs = obj;
354 allocator->n_free_objects++;
358 void yaffs_deinit_raw_tnodes_and_objs(struct yaffs_dev *dev)
360 if (dev->allocator) {
361 yaffs_deinit_raw_tnodes(dev);
362 yaffs_deinit_raw_objs(dev);
364 kfree(dev->allocator);
365 dev->allocator = NULL;
371 void yaffs_init_raw_tnodes_and_objs(struct yaffs_dev *dev)
373 struct yaffs_allocator *allocator;
375 if (!dev->allocator) {
376 allocator = kmalloc(sizeof(struct yaffs_allocator), GFP_NOFS);
378 dev->allocator = allocator;
379 yaffs_init_raw_tnodes(dev);
380 yaffs_init_raw_objs(dev);