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"
20 struct yaffs_tnode_list {
21 struct yaffs_tnode_list *next;
22 struct yaffs_tnode *tnodes;
25 struct yaffs_obj_list {
26 struct yaffs_obj_list *next;
27 struct yaffs_obj *objects;
30 struct yaffs_allocator {
32 struct yaffs_tnode *free_tnodes;
34 struct yaffs_tnode_list *alloc_tnode_list;
37 struct yaffs_obj *free_objs;
40 struct yaffs_obj_list *allocated_obj_list;
43 static void yaffs_deinit_raw_tnodes(struct yaffs_dev *dev)
45 struct yaffs_allocator *allocator =
46 (struct yaffs_allocator *)dev->allocator;
47 struct yaffs_tnode_list *tmp;
54 while (allocator->alloc_tnode_list) {
55 tmp = allocator->alloc_tnode_list->next;
57 kfree(allocator->alloc_tnode_list->tnodes);
58 kfree(allocator->alloc_tnode_list);
59 allocator->alloc_tnode_list = tmp;
62 allocator->free_tnodes = NULL;
63 allocator->n_free_tnodes = 0;
64 allocator->n_tnodes_created = 0;
67 static void yaffs_init_raw_tnodes(struct yaffs_dev *dev)
69 struct yaffs_allocator *allocator = dev->allocator;
72 allocator->alloc_tnode_list = NULL;
73 allocator->free_tnodes = NULL;
74 allocator->n_free_tnodes = 0;
75 allocator->n_tnodes_created = 0;
81 static int yaffs_create_tnodes(struct yaffs_dev *dev, int n_tnodes)
83 struct yaffs_allocator *allocator =
84 (struct yaffs_allocator *)dev->allocator;
86 struct yaffs_tnode *new_tnodes;
88 struct yaffs_tnode *curr;
89 struct yaffs_tnode *next;
90 struct yaffs_tnode_list *tnl;
100 /* make these things */
101 new_tnodes = kmalloc(n_tnodes * dev->tnode_size, GFP_NOFS);
102 mem = (u8 *) new_tnodes;
105 yaffs_trace(YAFFS_TRACE_ERROR,
106 "yaffs: Could not allocate Tnodes");
110 /* New hookup for wide tnodes */
111 for (i = 0; i < n_tnodes - 1; i++) {
112 curr = (struct yaffs_tnode *)&mem[i * dev->tnode_size];
113 next = (struct yaffs_tnode *)&mem[(i + 1) * dev->tnode_size];
114 curr->internal[0] = next;
117 curr = (struct yaffs_tnode *)&mem[(n_tnodes - 1) * dev->tnode_size];
118 curr->internal[0] = allocator->free_tnodes;
119 allocator->free_tnodes = (struct yaffs_tnode *)mem;
121 allocator->n_free_tnodes += n_tnodes;
122 allocator->n_tnodes_created += n_tnodes;
124 /* Now add this bunch of tnodes to a list for freeing up.
125 * NB If we can't add this to the management list it isn't fatal
126 * but it just means we can't free this bunch of tnodes later.
128 tnl = kmalloc(sizeof(struct yaffs_tnode_list), GFP_NOFS);
130 yaffs_trace(YAFFS_TRACE_ERROR,
131 "Could not add tnodes to management list");
134 tnl->tnodes = new_tnodes;
135 tnl->next = allocator->alloc_tnode_list;
136 allocator->alloc_tnode_list = tnl;
139 yaffs_trace(YAFFS_TRACE_ALLOCATE, "Tnodes added");
144 struct yaffs_tnode *yaffs_alloc_raw_tnode(struct yaffs_dev *dev)
146 struct yaffs_allocator *allocator =
147 (struct yaffs_allocator *)dev->allocator;
148 struct yaffs_tnode *tn = NULL;
155 /* If there are none left make more */
156 if (!allocator->free_tnodes)
157 yaffs_create_tnodes(dev, YAFFS_ALLOCATION_NTNODES);
159 if (allocator->free_tnodes) {
160 tn = allocator->free_tnodes;
161 allocator->free_tnodes = allocator->free_tnodes->internal[0];
162 allocator->n_free_tnodes--;
168 /* FreeTnode frees up a tnode and puts it back on the free list */
169 void yaffs_free_raw_tnode(struct yaffs_dev *dev, struct yaffs_tnode *tn)
171 struct yaffs_allocator *allocator = dev->allocator;
179 tn->internal[0] = allocator->free_tnodes;
180 allocator->free_tnodes = tn;
181 allocator->n_free_tnodes++;
183 dev->checkpoint_blocks_required = 0; /* force recalculation */
186 static void yaffs_init_raw_objs(struct yaffs_dev *dev)
188 struct yaffs_allocator *allocator = dev->allocator;
191 allocator->allocated_obj_list = NULL;
192 allocator->free_objs = NULL;
193 allocator->n_free_objects = 0;
199 static void yaffs_deinit_raw_objs(struct yaffs_dev *dev)
201 struct yaffs_allocator *allocator = dev->allocator;
202 struct yaffs_obj_list *tmp;
209 while (allocator->allocated_obj_list) {
210 tmp = allocator->allocated_obj_list->next;
211 kfree(allocator->allocated_obj_list->objects);
212 kfree(allocator->allocated_obj_list);
214 allocator->allocated_obj_list = tmp;
217 allocator->free_objs = NULL;
218 allocator->n_free_objects = 0;
219 allocator->n_obj_created = 0;
222 static int yaffs_create_free_objs(struct yaffs_dev *dev, int n_obj)
224 struct yaffs_allocator *allocator = dev->allocator;
226 struct yaffs_obj *new_objs;
227 struct yaffs_obj_list *list;
237 /* make these things */
238 new_objs = kmalloc(n_obj * sizeof(struct yaffs_obj), GFP_NOFS);
239 list = kmalloc(sizeof(struct yaffs_obj_list), GFP_NOFS);
241 if (!new_objs || !list) {
246 yaffs_trace(YAFFS_TRACE_ALLOCATE,
247 "Could not allocate more objects");
251 /* Hook them into the free list */
252 for (i = 0; i < n_obj - 1; i++) {
253 new_objs[i].siblings.next =
254 (struct list_head *)(&new_objs[i + 1]);
257 new_objs[n_obj - 1].siblings.next = (void *)allocator->free_objs;
258 allocator->free_objs = new_objs;
259 allocator->n_free_objects += n_obj;
260 allocator->n_obj_created += n_obj;
262 /* Now add this bunch of Objects to a list for freeing up. */
264 list->objects = new_objs;
265 list->next = allocator->allocated_obj_list;
266 allocator->allocated_obj_list = list;
271 struct yaffs_obj *yaffs_alloc_raw_obj(struct yaffs_dev *dev)
273 struct yaffs_obj *obj = NULL;
274 struct yaffs_allocator *allocator = dev->allocator;
281 /* If there are none left make more */
282 if (!allocator->free_objs)
283 yaffs_create_free_objs(dev, YAFFS_ALLOCATION_NOBJECTS);
285 if (allocator->free_objs) {
286 obj = allocator->free_objs;
287 allocator->free_objs =
288 (struct yaffs_obj *)(allocator->free_objs->siblings.next);
289 allocator->n_free_objects--;
295 void yaffs_free_raw_obj(struct yaffs_dev *dev, struct yaffs_obj *obj)
298 struct yaffs_allocator *allocator = dev->allocator;
303 /* Link into the free list. */
304 obj->siblings.next = (struct list_head *)(allocator->free_objs);
305 allocator->free_objs = obj;
306 allocator->n_free_objects++;
310 void yaffs_deinit_raw_tnodes_and_objs(struct yaffs_dev *dev)
312 if (dev->allocator) {
313 yaffs_deinit_raw_tnodes(dev);
314 yaffs_deinit_raw_objs(dev);
316 kfree(dev->allocator);
317 dev->allocator = NULL;
323 void yaffs_init_raw_tnodes_and_objs(struct yaffs_dev *dev)
325 struct yaffs_allocator *allocator;
327 if (!dev->allocator) {
328 allocator = kmalloc(sizeof(struct yaffs_allocator), GFP_NOFS);
330 dev->allocator = allocator;
331 yaffs_init_raw_tnodes(dev);
332 yaffs_init_raw_objs(dev);