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.
16 #include "yaffs_allocator.h"
17 #include "yaffs_guts.h"
18 #include "yaffs_trace.h"
21 #ifdef CONFIG_YAFFS_YMALLOC_ALLOCATOR
23 void yaffs_deinit_raw_tnodes_and_objs(yaffs_dev_t *dev)
28 void yaffs_init_raw_tnodes_and_objs(yaffs_dev_t *dev)
33 yaffs_tnode_t *yaffs_alloc_raw_tnode(yaffs_dev_t *dev)
35 return (yaffs_tnode_t *)YMALLOC(dev->tnode_size);
38 void yaffs_free_raw_tnode(yaffs_dev_t *dev, yaffs_tnode_t *tn)
44 void yaffs_init_raw_objs(yaffs_dev_t *dev)
49 void yaffs_deinit_raw_objs(yaffs_dev_t *dev)
54 yaffs_obj_t *yaffs_alloc_raw_obj(yaffs_dev_t *dev)
57 return (yaffs_obj_t *) YMALLOC(sizeof(yaffs_obj_t));
61 void yaffs_free_raw_obj(yaffs_dev_t *dev, yaffs_obj_t *obj)
70 struct yaffs_tnode_list {
71 struct yaffs_tnode_list *next;
72 yaffs_tnode_t *tnodes;
75 typedef struct yaffs_tnode_list yaffs_tnodelist_t;
77 struct yaffs_obj_list_struct {
79 struct yaffs_obj_list_struct *next;
82 typedef struct yaffs_obj_list_struct yaffs_obj_list;
85 struct yaffs_allocator {
87 yaffs_tnode_t *free_tnodes;
89 yaffs_tnodelist_t *alloc_tnode_list;
92 yaffs_obj_t *free_objs;
95 yaffs_obj_list *allocated_obj_list;
99 static void yaffs_deinit_raw_tnodes(yaffs_dev_t *dev)
102 struct yaffs_allocator *allocator = (struct yaffs_allocator *)dev->allocator;
104 yaffs_tnodelist_t *tmp;
111 while (allocator->alloc_tnode_list) {
112 tmp = allocator->alloc_tnode_list->next;
114 YFREE(allocator->alloc_tnode_list->tnodes);
115 YFREE(allocator->alloc_tnode_list);
116 allocator->alloc_tnode_list = tmp;
120 allocator->free_tnodes = NULL;
121 allocator->n_free_tnodes = 0;
122 allocator->n_tnodes_created = 0;
125 static void yaffs_init_raw_tnodes(yaffs_dev_t *dev)
127 struct yaffs_allocator *allocator = dev->allocator;
130 allocator->alloc_tnode_list = NULL;
131 allocator->free_tnodes = NULL;
132 allocator->n_free_tnodes = 0;
133 allocator->n_tnodes_created = 0;
138 static int yaffs_create_tnodes(yaffs_dev_t *dev, int n_tnodes)
140 struct yaffs_allocator *allocator = (struct yaffs_allocator *)dev->allocator;
142 yaffs_tnode_t *new_tnodes;
146 yaffs_tnodelist_t *tnl;
157 /* make these things */
159 new_tnodes = YMALLOC(n_tnodes * dev->tnode_size);
160 mem = (__u8 *)new_tnodes;
164 (TSTR("yaffs: Could not allocate Tnodes" TENDSTR)));
168 /* New hookup for wide tnodes */
169 for (i = 0; i < n_tnodes - 1; i++) {
170 curr = (yaffs_tnode_t *) &mem[i * dev->tnode_size];
171 next = (yaffs_tnode_t *) &mem[(i+1) * dev->tnode_size];
172 curr->internal[0] = next;
175 curr = (yaffs_tnode_t *) &mem[(n_tnodes - 1) * dev->tnode_size];
176 curr->internal[0] = allocator->free_tnodes;
177 allocator->free_tnodes = (yaffs_tnode_t *)mem;
179 allocator->n_free_tnodes += n_tnodes;
180 allocator->n_tnodes_created += n_tnodes;
182 /* Now add this bunch of tnodes to a list for freeing up.
183 * NB If we can't add this to the management list it isn't fatal
184 * but it just means we can't free this bunch of tnodes later.
187 tnl = YMALLOC(sizeof(yaffs_tnodelist_t));
191 ("yaffs: Could not add tnodes to management list" TENDSTR)));
194 tnl->tnodes = new_tnodes;
195 tnl->next = allocator->alloc_tnode_list;
196 allocator->alloc_tnode_list = tnl;
199 T(YAFFS_TRACE_ALLOCATE, (TSTR("yaffs: Tnodes added" TENDSTR)));
205 yaffs_tnode_t *yaffs_alloc_raw_tnode(yaffs_dev_t *dev)
207 struct yaffs_allocator *allocator = (struct yaffs_allocator *)dev->allocator;
208 yaffs_tnode_t *tn = NULL;
215 /* If there are none left make more */
216 if (!allocator->free_tnodes)
217 yaffs_create_tnodes(dev, YAFFS_ALLOCATION_NTNODES);
219 if (allocator->free_tnodes) {
220 tn = allocator->free_tnodes;
221 allocator->free_tnodes = allocator->free_tnodes->internal[0];
222 allocator->n_free_tnodes--;
228 /* FreeTnode frees up a tnode and puts it back on the free list */
229 void yaffs_free_raw_tnode(yaffs_dev_t *dev, yaffs_tnode_t *tn)
231 struct yaffs_allocator *allocator = dev->allocator;
239 tn->internal[0] = allocator->free_tnodes;
240 allocator->free_tnodes = tn;
241 allocator->n_free_tnodes++;
243 dev->checkpoint_blocks_required = 0; /* force recalculation*/
248 static void yaffs_init_raw_objs(yaffs_dev_t *dev)
250 struct yaffs_allocator *allocator = dev->allocator;
253 allocator->allocated_obj_list = NULL;
254 allocator->free_objs = NULL;
255 allocator->n_free_objects = 0;
260 static void yaffs_deinit_raw_objs(yaffs_dev_t *dev)
262 struct yaffs_allocator *allocator = dev->allocator;
270 while (allocator->allocated_obj_list) {
271 tmp = allocator->allocated_obj_list->next;
272 YFREE(allocator->allocated_obj_list->objects);
273 YFREE(allocator->allocated_obj_list);
275 allocator->allocated_obj_list = tmp;
278 allocator->free_objs = NULL;
279 allocator->n_free_objects = 0;
280 allocator->n_obj_created = 0;
284 static int yaffs_create_free_objs(yaffs_dev_t *dev, int n_obj)
286 struct yaffs_allocator *allocator = dev->allocator;
289 yaffs_obj_t *new_objs;
290 yaffs_obj_list *list;
300 /* make these things */
301 new_objs = YMALLOC(n_obj * sizeof(yaffs_obj_t));
302 list = YMALLOC(sizeof(yaffs_obj_list));
304 if (!new_objs || !list) {
313 T(YAFFS_TRACE_ALLOCATE,
314 (TSTR("yaffs: Could not allocate more objects" TENDSTR)));
318 /* Hook them into the free list */
319 for (i = 0; i < n_obj - 1; i++) {
320 new_objs[i].siblings.next =
321 (struct ylist_head *)(&new_objs[i + 1]);
324 new_objs[n_obj - 1].siblings.next = (void *)allocator->free_objs;
325 allocator->free_objs = new_objs;
326 allocator->n_free_objects += n_obj;
327 allocator->n_obj_created += n_obj;
329 /* Now add this bunch of Objects to a list for freeing up. */
331 list->objects = new_objs;
332 list->next = allocator->allocated_obj_list;
333 allocator->allocated_obj_list = list;
338 yaffs_obj_t *yaffs_alloc_raw_obj(yaffs_dev_t *dev)
340 yaffs_obj_t *obj = NULL;
341 struct yaffs_allocator *allocator = dev->allocator;
348 /* If there are none left make more */
349 if (!allocator->free_objs)
350 yaffs_create_free_objs(dev, YAFFS_ALLOCATION_NOBJECTS);
352 if (allocator->free_objs) {
353 obj = allocator->free_objs;
354 allocator->free_objs =
355 (yaffs_obj_t *) (allocator->free_objs->siblings.next);
356 allocator->n_free_objects--;
363 void yaffs_free_raw_obj(yaffs_dev_t *dev, yaffs_obj_t *obj)
366 struct yaffs_allocator *allocator = dev->allocator;
371 /* Link into the free list. */
372 obj->siblings.next = (struct ylist_head *)(allocator->free_objs);
373 allocator->free_objs = obj;
374 allocator->n_free_objects++;
378 void yaffs_deinit_raw_tnodes_and_objs(yaffs_dev_t *dev)
381 yaffs_deinit_raw_tnodes(dev);
382 yaffs_deinit_raw_objs(dev);
384 YFREE(dev->allocator);
390 void yaffs_init_raw_tnodes_and_objs(yaffs_dev_t *dev)
392 struct yaffs_allocator *allocator;
395 allocator = YMALLOC(sizeof(struct yaffs_allocator));
397 dev->allocator = allocator;
398 yaffs_init_raw_tnodes(dev);
399 yaffs_init_raw_objs(dev);