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_YMALLOC_ALLOCATOR
21 void yaffs_deinit_raw_tnodes_and_objs(struct yaffs_dev *dev)
26 void yaffs_init_raw_tnodes_and_objs(struct yaffs_dev *dev)
31 struct yaffs_tnode *yaffs_alloc_raw_tnode(struct yaffs_dev *dev)
33 return (struct yaffs_tnode *)YMALLOC(dev->tnode_size);
36 void yaffs_free_raw_tnode(struct yaffs_dev *dev, struct yaffs_tnode *tn)
42 void yaffs_init_raw_objs(struct yaffs_dev *dev)
47 void yaffs_deinit_raw_objs(struct yaffs_dev *dev)
52 struct yaffs_obj *yaffs_alloc_raw_obj(struct yaffs_dev *dev)
55 return (struct yaffs_obj *)YMALLOC(sizeof(struct yaffs_obj));
58 void yaffs_free_raw_obj(struct yaffs_dev *dev, struct yaffs_obj *obj)
67 struct yaffs_tnode_list {
68 struct yaffs_tnode_list *next;
69 struct yaffs_tnode *tnodes;
72 struct yaffs_obj_list {
73 struct yaffs_obj_list *next;
74 struct yaffs_obj *objects;
77 struct yaffs_allocator {
79 struct yaffs_tnode *free_tnodes;
81 struct yaffs_tnode_list *alloc_tnode_list;
84 struct yaffs_obj *free_objs;
87 struct yaffs_obj_list *allocated_obj_list;
90 static void yaffs_deinit_raw_tnodes(struct yaffs_dev *dev)
93 struct yaffs_allocator *allocator =
94 (struct yaffs_allocator *)dev->allocator;
96 struct yaffs_tnode_list *tmp;
103 while (allocator->alloc_tnode_list) {
104 tmp = allocator->alloc_tnode_list->next;
106 YFREE(allocator->alloc_tnode_list->tnodes);
107 YFREE(allocator->alloc_tnode_list);
108 allocator->alloc_tnode_list = tmp;
112 allocator->free_tnodes = NULL;
113 allocator->n_free_tnodes = 0;
114 allocator->n_tnodes_created = 0;
117 static void yaffs_init_raw_tnodes(struct yaffs_dev *dev)
119 struct yaffs_allocator *allocator = dev->allocator;
122 allocator->alloc_tnode_list = NULL;
123 allocator->free_tnodes = NULL;
124 allocator->n_free_tnodes = 0;
125 allocator->n_tnodes_created = 0;
130 static int yaffs_create_tnodes(struct yaffs_dev *dev, int n_tnodes)
132 struct yaffs_allocator *allocator =
133 (struct yaffs_allocator *)dev->allocator;
135 struct yaffs_tnode *new_tnodes;
137 struct yaffs_tnode *curr;
138 struct yaffs_tnode *next;
139 struct yaffs_tnode_list *tnl;
149 /* make these things */
151 new_tnodes = YMALLOC(n_tnodes * dev->tnode_size);
152 mem = (u8 *) new_tnodes;
156 (TSTR("yaffs: Could not allocate Tnodes" TENDSTR)));
160 /* New hookup for wide tnodes */
161 for (i = 0; i < n_tnodes - 1; i++) {
162 curr = (struct yaffs_tnode *)&mem[i * dev->tnode_size];
163 next = (struct yaffs_tnode *)&mem[(i + 1) * dev->tnode_size];
164 curr->internal[0] = next;
167 curr = (struct yaffs_tnode *)&mem[(n_tnodes - 1) * dev->tnode_size];
168 curr->internal[0] = allocator->free_tnodes;
169 allocator->free_tnodes = (struct yaffs_tnode *)mem;
171 allocator->n_free_tnodes += n_tnodes;
172 allocator->n_tnodes_created += n_tnodes;
174 /* Now add this bunch of tnodes to a list for freeing up.
175 * NB If we can't add this to the management list it isn't fatal
176 * but it just means we can't free this bunch of tnodes later.
179 tnl = YMALLOC(sizeof(struct yaffs_tnode_list));
183 ("yaffs: Could not add tnodes to management list" TENDSTR)));
186 tnl->tnodes = new_tnodes;
187 tnl->next = allocator->alloc_tnode_list;
188 allocator->alloc_tnode_list = tnl;
191 T(YAFFS_TRACE_ALLOCATE, (TSTR("yaffs: Tnodes added" TENDSTR)));
196 struct yaffs_tnode *yaffs_alloc_raw_tnode(struct yaffs_dev *dev)
198 struct yaffs_allocator *allocator =
199 (struct yaffs_allocator *)dev->allocator;
200 struct yaffs_tnode *tn = NULL;
207 /* If there are none left make more */
208 if (!allocator->free_tnodes)
209 yaffs_create_tnodes(dev, YAFFS_ALLOCATION_NTNODES);
211 if (allocator->free_tnodes) {
212 tn = allocator->free_tnodes;
213 allocator->free_tnodes = allocator->free_tnodes->internal[0];
214 allocator->n_free_tnodes--;
220 /* FreeTnode frees up a tnode and puts it back on the free list */
221 void yaffs_free_raw_tnode(struct yaffs_dev *dev, struct yaffs_tnode *tn)
223 struct yaffs_allocator *allocator = dev->allocator;
231 tn->internal[0] = allocator->free_tnodes;
232 allocator->free_tnodes = tn;
233 allocator->n_free_tnodes++;
235 dev->checkpoint_blocks_required = 0; /* force recalculation */
238 static void yaffs_init_raw_objs(struct yaffs_dev *dev)
240 struct yaffs_allocator *allocator = dev->allocator;
243 allocator->allocated_obj_list = NULL;
244 allocator->free_objs = NULL;
245 allocator->n_free_objects = 0;
250 static void yaffs_deinit_raw_objs(struct yaffs_dev *dev)
252 struct yaffs_allocator *allocator = dev->allocator;
253 struct yaffs_obj_list *tmp;
260 while (allocator->allocated_obj_list) {
261 tmp = allocator->allocated_obj_list->next;
262 YFREE(allocator->allocated_obj_list->objects);
263 YFREE(allocator->allocated_obj_list);
265 allocator->allocated_obj_list = tmp;
268 allocator->free_objs = NULL;
269 allocator->n_free_objects = 0;
270 allocator->n_obj_created = 0;
273 static int yaffs_create_free_objs(struct yaffs_dev *dev, int n_obj)
275 struct yaffs_allocator *allocator = dev->allocator;
278 struct yaffs_obj *new_objs;
279 struct yaffs_obj_list *list;
289 /* make these things */
290 new_objs = YMALLOC(n_obj * sizeof(struct yaffs_obj));
291 list = YMALLOC(sizeof(struct yaffs_obj_list));
293 if (!new_objs || !list) {
302 T(YAFFS_TRACE_ALLOCATE,
303 (TSTR("yaffs: Could not allocate more objects" TENDSTR)));
307 /* Hook them into the free list */
308 for (i = 0; i < n_obj - 1; i++) {
309 new_objs[i].siblings.next =
310 (struct list_head *)(&new_objs[i + 1]);
313 new_objs[n_obj - 1].siblings.next = (void *)allocator->free_objs;
314 allocator->free_objs = new_objs;
315 allocator->n_free_objects += n_obj;
316 allocator->n_obj_created += n_obj;
318 /* Now add this bunch of Objects to a list for freeing up. */
320 list->objects = new_objs;
321 list->next = allocator->allocated_obj_list;
322 allocator->allocated_obj_list = list;
327 struct yaffs_obj *yaffs_alloc_raw_obj(struct yaffs_dev *dev)
329 struct yaffs_obj *obj = NULL;
330 struct yaffs_allocator *allocator = dev->allocator;
337 /* If there are none left make more */
338 if (!allocator->free_objs)
339 yaffs_create_free_objs(dev, YAFFS_ALLOCATION_NOBJECTS);
341 if (allocator->free_objs) {
342 obj = allocator->free_objs;
343 allocator->free_objs =
344 (struct yaffs_obj *)(allocator->free_objs->siblings.next);
345 allocator->n_free_objects--;
351 void yaffs_free_raw_obj(struct yaffs_dev *dev, struct yaffs_obj *obj)
354 struct yaffs_allocator *allocator = dev->allocator;
359 /* Link into the free list. */
360 obj->siblings.next = (struct list_head *)(allocator->free_objs);
361 allocator->free_objs = obj;
362 allocator->n_free_objects++;
366 void yaffs_deinit_raw_tnodes_and_objs(struct yaffs_dev *dev)
368 if (dev->allocator) {
369 yaffs_deinit_raw_tnodes(dev);
370 yaffs_deinit_raw_objs(dev);
372 YFREE(dev->allocator);
373 dev->allocator = NULL;
378 void yaffs_init_raw_tnodes_and_objs(struct yaffs_dev *dev)
380 struct yaffs_allocator *allocator;
382 if (!dev->allocator) {
383 allocator = YMALLOC(sizeof(struct yaffs_allocator));
385 dev->allocator = allocator;
386 yaffs_init_raw_tnodes(dev);
387 yaffs_init_raw_objs(dev);