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(struct yaffs_dev *dev)
28 void yaffs_init_raw_tnodes_and_objs(struct yaffs_dev *dev)
33 struct yaffs_tnode *yaffs_alloc_raw_tnode(struct yaffs_dev *dev)
35 return (struct yaffs_tnode *)YMALLOC(dev->tnode_size);
38 void yaffs_free_raw_tnode(struct yaffs_dev *dev, struct yaffs_tnode *tn)
44 void yaffs_init_raw_objs(struct yaffs_dev *dev)
49 void yaffs_deinit_raw_objs(struct yaffs_dev *dev)
54 struct yaffs_obj *yaffs_alloc_raw_obj(struct yaffs_dev *dev)
57 return (struct yaffs_obj *) YMALLOC(sizeof(struct yaffs_obj));
61 void yaffs_free_raw_obj(struct yaffs_dev *dev, struct yaffs_obj *obj)
70 struct yaffs_tnode_list {
71 struct yaffs_tnode_list *next;
72 struct yaffs_tnode *tnodes;
76 struct yaffs_obj_list {
77 struct yaffs_obj_list *next;
78 struct yaffs_obj *objects;
82 struct yaffs_allocator {
84 struct yaffs_tnode *free_tnodes;
86 struct yaffs_tnode_list *alloc_tnode_list;
89 struct yaffs_obj *free_objs;
92 struct yaffs_obj_list *allocated_obj_list;
96 static void yaffs_deinit_raw_tnodes(struct yaffs_dev *dev)
99 struct yaffs_allocator *allocator = (struct yaffs_allocator *)dev->allocator;
101 struct yaffs_tnode_list *tmp;
108 while (allocator->alloc_tnode_list) {
109 tmp = allocator->alloc_tnode_list->next;
111 YFREE(allocator->alloc_tnode_list->tnodes);
112 YFREE(allocator->alloc_tnode_list);
113 allocator->alloc_tnode_list = tmp;
117 allocator->free_tnodes = NULL;
118 allocator->n_free_tnodes = 0;
119 allocator->n_tnodes_created = 0;
122 static void yaffs_init_raw_tnodes(struct yaffs_dev *dev)
124 struct yaffs_allocator *allocator = dev->allocator;
127 allocator->alloc_tnode_list = NULL;
128 allocator->free_tnodes = NULL;
129 allocator->n_free_tnodes = 0;
130 allocator->n_tnodes_created = 0;
135 static int yaffs_create_tnodes(struct yaffs_dev *dev, int n_tnodes)
137 struct yaffs_allocator *allocator = (struct yaffs_allocator *)dev->allocator;
139 struct yaffs_tnode *new_tnodes;
141 struct yaffs_tnode *curr;
142 struct yaffs_tnode *next;
143 struct yaffs_tnode_list *tnl;
154 /* make these things */
156 new_tnodes = YMALLOC(n_tnodes * dev->tnode_size);
157 mem = (u8 *)new_tnodes;
161 (TSTR("yaffs: Could not allocate Tnodes" TENDSTR)));
165 /* New hookup for wide tnodes */
166 for (i = 0; i < n_tnodes - 1; i++) {
167 curr = (struct yaffs_tnode *) &mem[i * dev->tnode_size];
168 next = (struct yaffs_tnode *) &mem[(i+1) * dev->tnode_size];
169 curr->internal[0] = next;
172 curr = (struct yaffs_tnode *) &mem[(n_tnodes - 1) * dev->tnode_size];
173 curr->internal[0] = allocator->free_tnodes;
174 allocator->free_tnodes = (struct yaffs_tnode *)mem;
176 allocator->n_free_tnodes += n_tnodes;
177 allocator->n_tnodes_created += n_tnodes;
179 /* Now add this bunch of tnodes to a list for freeing up.
180 * NB If we can't add this to the management list it isn't fatal
181 * but it just means we can't free this bunch of tnodes later.
184 tnl = YMALLOC(sizeof(struct yaffs_tnode_list));
188 ("yaffs: Could not add tnodes to management list" TENDSTR)));
191 tnl->tnodes = new_tnodes;
192 tnl->next = allocator->alloc_tnode_list;
193 allocator->alloc_tnode_list = tnl;
196 T(YAFFS_TRACE_ALLOCATE, (TSTR("yaffs: Tnodes added" TENDSTR)));
202 struct yaffs_tnode *yaffs_alloc_raw_tnode(struct yaffs_dev *dev)
204 struct yaffs_allocator *allocator = (struct yaffs_allocator *)dev->allocator;
205 struct yaffs_tnode *tn = NULL;
212 /* If there are none left make more */
213 if (!allocator->free_tnodes)
214 yaffs_create_tnodes(dev, YAFFS_ALLOCATION_NTNODES);
216 if (allocator->free_tnodes) {
217 tn = allocator->free_tnodes;
218 allocator->free_tnodes = allocator->free_tnodes->internal[0];
219 allocator->n_free_tnodes--;
225 /* FreeTnode frees up a tnode and puts it back on the free list */
226 void yaffs_free_raw_tnode(struct yaffs_dev *dev, struct yaffs_tnode *tn)
228 struct yaffs_allocator *allocator = dev->allocator;
236 tn->internal[0] = allocator->free_tnodes;
237 allocator->free_tnodes = tn;
238 allocator->n_free_tnodes++;
240 dev->checkpoint_blocks_required = 0; /* force recalculation*/
245 static void yaffs_init_raw_objs(struct yaffs_dev *dev)
247 struct yaffs_allocator *allocator = dev->allocator;
250 allocator->allocated_obj_list = NULL;
251 allocator->free_objs = NULL;
252 allocator->n_free_objects = 0;
257 static void yaffs_deinit_raw_objs(struct yaffs_dev *dev)
259 struct yaffs_allocator *allocator = dev->allocator;
260 struct yaffs_obj_list *tmp;
267 while (allocator->allocated_obj_list) {
268 tmp = allocator->allocated_obj_list->next;
269 YFREE(allocator->allocated_obj_list->objects);
270 YFREE(allocator->allocated_obj_list);
272 allocator->allocated_obj_list = tmp;
275 allocator->free_objs = NULL;
276 allocator->n_free_objects = 0;
277 allocator->n_obj_created = 0;
281 static int yaffs_create_free_objs(struct yaffs_dev *dev, int n_obj)
283 struct yaffs_allocator *allocator = dev->allocator;
286 struct yaffs_obj *new_objs;
287 struct yaffs_obj_list *list;
297 /* make these things */
298 new_objs = YMALLOC(n_obj * sizeof(struct yaffs_obj));
299 list = YMALLOC(sizeof(struct yaffs_obj_list));
301 if (!new_objs || !list) {
310 T(YAFFS_TRACE_ALLOCATE,
311 (TSTR("yaffs: Could not allocate more objects" TENDSTR)));
315 /* Hook them into the free list */
316 for (i = 0; i < n_obj - 1; i++) {
317 new_objs[i].siblings.next =
318 (struct ylist_head *)(&new_objs[i + 1]);
321 new_objs[n_obj - 1].siblings.next = (void *)allocator->free_objs;
322 allocator->free_objs = new_objs;
323 allocator->n_free_objects += n_obj;
324 allocator->n_obj_created += n_obj;
326 /* Now add this bunch of Objects to a list for freeing up. */
328 list->objects = new_objs;
329 list->next = allocator->allocated_obj_list;
330 allocator->allocated_obj_list = list;
335 struct yaffs_obj *yaffs_alloc_raw_obj(struct yaffs_dev *dev)
337 struct yaffs_obj *obj = NULL;
338 struct yaffs_allocator *allocator = dev->allocator;
345 /* If there are none left make more */
346 if (!allocator->free_objs)
347 yaffs_create_free_objs(dev, YAFFS_ALLOCATION_NOBJECTS);
349 if (allocator->free_objs) {
350 obj = allocator->free_objs;
351 allocator->free_objs =
352 (struct yaffs_obj *) (allocator->free_objs->siblings.next);
353 allocator->n_free_objects--;
360 void yaffs_free_raw_obj(struct yaffs_dev *dev, struct yaffs_obj *obj)
363 struct yaffs_allocator *allocator = dev->allocator;
368 /* Link into the free list. */
369 obj->siblings.next = (struct ylist_head *)(allocator->free_objs);
370 allocator->free_objs = obj;
371 allocator->n_free_objects++;
375 void yaffs_deinit_raw_tnodes_and_objs(struct yaffs_dev *dev)
378 yaffs_deinit_raw_tnodes(dev);
379 yaffs_deinit_raw_objs(dev);
381 YFREE(dev->allocator);
387 void yaffs_init_raw_tnodes_and_objs(struct yaffs_dev *dev)
389 struct yaffs_allocator *allocator;
392 allocator = YMALLOC(sizeof(struct yaffs_allocator));
394 dev->allocator = allocator;
395 yaffs_init_raw_tnodes(dev);
396 yaffs_init_raw_objs(dev);