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
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 *)kmalloc(dev->tnode_size, GFP_NOFS);
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 *)kmalloc(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 kfree(allocator->alloc_tnode_list->tnodes);
107 kfree(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;
131 static int yaffs_create_tnodes(struct yaffs_dev *dev, int n_tnodes)
133 struct yaffs_allocator *allocator =
134 (struct yaffs_allocator *)dev->allocator;
136 struct yaffs_tnode *new_tnodes;
138 struct yaffs_tnode *curr;
139 struct yaffs_tnode *next;
140 struct yaffs_tnode_list *tnl;
150 /* make these things */
152 new_tnodes = kmalloc(n_tnodes * dev->tnode_size, GFP_NOFS);
153 mem = (u8 *) new_tnodes;
157 (TSTR("yaffs: Could not allocate Tnodes" TENDSTR)));
161 /* New hookup for wide tnodes */
162 for (i = 0; i < n_tnodes - 1; i++) {
163 curr = (struct yaffs_tnode *)&mem[i * dev->tnode_size];
164 next = (struct yaffs_tnode *)&mem[(i + 1) * dev->tnode_size];
165 curr->internal[0] = next;
168 curr = (struct yaffs_tnode *)&mem[(n_tnodes - 1) * dev->tnode_size];
169 curr->internal[0] = allocator->free_tnodes;
170 allocator->free_tnodes = (struct yaffs_tnode *)mem;
172 allocator->n_free_tnodes += n_tnodes;
173 allocator->n_tnodes_created += n_tnodes;
175 /* Now add this bunch of tnodes to a list for freeing up.
176 * NB If we can't add this to the management list it isn't fatal
177 * but it just means we can't free this bunch of tnodes later.
180 tnl = kmalloc(sizeof(struct yaffs_tnode_list), GFP_NOFS);
184 ("yaffs: Could not add tnodes to management list" TENDSTR)));
187 tnl->tnodes = new_tnodes;
188 tnl->next = allocator->alloc_tnode_list;
189 allocator->alloc_tnode_list = tnl;
192 T(YAFFS_TRACE_ALLOCATE, (TSTR("yaffs: Tnodes added" TENDSTR)));
197 struct yaffs_tnode *yaffs_alloc_raw_tnode(struct yaffs_dev *dev)
199 struct yaffs_allocator *allocator =
200 (struct yaffs_allocator *)dev->allocator;
201 struct yaffs_tnode *tn = NULL;
208 /* If there are none left make more */
209 if (!allocator->free_tnodes)
210 yaffs_create_tnodes(dev, YAFFS_ALLOCATION_NTNODES);
212 if (allocator->free_tnodes) {
213 tn = allocator->free_tnodes;
214 allocator->free_tnodes = allocator->free_tnodes->internal[0];
215 allocator->n_free_tnodes--;
221 /* FreeTnode frees up a tnode and puts it back on the free list */
222 void yaffs_free_raw_tnode(struct yaffs_dev *dev, struct yaffs_tnode *tn)
224 struct yaffs_allocator *allocator = dev->allocator;
232 tn->internal[0] = allocator->free_tnodes;
233 allocator->free_tnodes = tn;
234 allocator->n_free_tnodes++;
236 dev->checkpoint_blocks_required = 0; /* force recalculation */
239 static void yaffs_init_raw_objs(struct yaffs_dev *dev)
241 struct yaffs_allocator *allocator = dev->allocator;
244 allocator->allocated_obj_list = NULL;
245 allocator->free_objs = NULL;
246 allocator->n_free_objects = 0;
252 static void yaffs_deinit_raw_objs(struct yaffs_dev *dev)
254 struct yaffs_allocator *allocator = dev->allocator;
255 struct yaffs_obj_list *tmp;
262 while (allocator->allocated_obj_list) {
263 tmp = allocator->allocated_obj_list->next;
264 kfree(allocator->allocated_obj_list->objects);
265 kfree(allocator->allocated_obj_list);
267 allocator->allocated_obj_list = tmp;
270 allocator->free_objs = NULL;
271 allocator->n_free_objects = 0;
272 allocator->n_obj_created = 0;
275 static int yaffs_create_free_objs(struct yaffs_dev *dev, int n_obj)
277 struct yaffs_allocator *allocator = dev->allocator;
280 struct yaffs_obj *new_objs;
281 struct yaffs_obj_list *list;
291 /* make these things */
292 new_objs = kmalloc(n_obj * sizeof(struct yaffs_obj), GFP_NOFS);
293 list = kmalloc(sizeof(struct yaffs_obj_list), GFP_NOFS);
295 if (!new_objs || !list) {
304 T(YAFFS_TRACE_ALLOCATE,
305 (TSTR("yaffs: Could not allocate more objects" TENDSTR)));
309 /* Hook them into the free list */
310 for (i = 0; i < n_obj - 1; i++) {
311 new_objs[i].siblings.next =
312 (struct list_head *)(&new_objs[i + 1]);
315 new_objs[n_obj - 1].siblings.next = (void *)allocator->free_objs;
316 allocator->free_objs = new_objs;
317 allocator->n_free_objects += n_obj;
318 allocator->n_obj_created += n_obj;
320 /* Now add this bunch of Objects to a list for freeing up. */
322 list->objects = new_objs;
323 list->next = allocator->allocated_obj_list;
324 allocator->allocated_obj_list = list;
329 struct yaffs_obj *yaffs_alloc_raw_obj(struct yaffs_dev *dev)
331 struct yaffs_obj *obj = NULL;
332 struct yaffs_allocator *allocator = dev->allocator;
339 /* If there are none left make more */
340 if (!allocator->free_objs)
341 yaffs_create_free_objs(dev, YAFFS_ALLOCATION_NOBJECTS);
343 if (allocator->free_objs) {
344 obj = allocator->free_objs;
345 allocator->free_objs =
346 (struct yaffs_obj *)(allocator->free_objs->siblings.next);
347 allocator->n_free_objects--;
353 void yaffs_free_raw_obj(struct yaffs_dev *dev, struct yaffs_obj *obj)
356 struct yaffs_allocator *allocator = dev->allocator;
361 /* Link into the free list. */
362 obj->siblings.next = (struct list_head *)(allocator->free_objs);
363 allocator->free_objs = obj;
364 allocator->n_free_objects++;
368 void yaffs_deinit_raw_tnodes_and_objs(struct yaffs_dev *dev)
370 if (dev->allocator) {
371 yaffs_deinit_raw_tnodes(dev);
372 yaffs_deinit_raw_objs(dev);
374 kfree(dev->allocator);
375 dev->allocator = NULL;
381 void yaffs_init_raw_tnodes_and_objs(struct yaffs_dev *dev)
383 struct yaffs_allocator *allocator;
385 if (!dev->allocator) {
386 allocator = kmalloc(sizeof(struct yaffs_allocator), GFP_NOFS);
388 dev->allocator = allocator;
389 yaffs_init_raw_tnodes(dev);
390 yaffs_init_raw_objs(dev);