Root/fs/jffs2/malloc.c

1/*
2 * JFFS2 -- Journalling Flash File System, Version 2.
3 *
4 * Copyright © 2001-2007 Red Hat, Inc.
5 *
6 * Created by David Woodhouse <dwmw2@infradead.org>
7 *
8 * For licensing information, see the file 'LICENCE' in this directory.
9 *
10 */
11
12#include <linux/kernel.h>
13#include <linux/slab.h>
14#include <linux/init.h>
15#include <linux/jffs2.h>
16#include "nodelist.h"
17
18/* These are initialised to NULL in the kernel startup code.
19   If you're porting to other operating systems, beware */
20static struct kmem_cache *full_dnode_slab;
21static struct kmem_cache *raw_dirent_slab;
22static struct kmem_cache *raw_inode_slab;
23static struct kmem_cache *tmp_dnode_info_slab;
24static struct kmem_cache *raw_node_ref_slab;
25static struct kmem_cache *node_frag_slab;
26static struct kmem_cache *inode_cache_slab;
27#ifdef CONFIG_JFFS2_FS_XATTR
28static struct kmem_cache *xattr_datum_cache;
29static struct kmem_cache *xattr_ref_cache;
30#endif
31
32int __init jffs2_create_slab_caches(void)
33{
34    full_dnode_slab = kmem_cache_create("jffs2_full_dnode",
35                        sizeof(struct jffs2_full_dnode),
36                        0, 0, NULL);
37    if (!full_dnode_slab)
38        goto err;
39
40    raw_dirent_slab = kmem_cache_create("jffs2_raw_dirent",
41                        sizeof(struct jffs2_raw_dirent),
42                        0, 0, NULL);
43    if (!raw_dirent_slab)
44        goto err;
45
46    raw_inode_slab = kmem_cache_create("jffs2_raw_inode",
47                       sizeof(struct jffs2_raw_inode),
48                       0, 0, NULL);
49    if (!raw_inode_slab)
50        goto err;
51
52    tmp_dnode_info_slab = kmem_cache_create("jffs2_tmp_dnode",
53                        sizeof(struct jffs2_tmp_dnode_info),
54                        0, 0, NULL);
55    if (!tmp_dnode_info_slab)
56        goto err;
57
58    raw_node_ref_slab = kmem_cache_create("jffs2_refblock",
59                          sizeof(struct jffs2_raw_node_ref) * (REFS_PER_BLOCK + 1),
60                          0, 0, NULL);
61    if (!raw_node_ref_slab)
62        goto err;
63
64    node_frag_slab = kmem_cache_create("jffs2_node_frag",
65                       sizeof(struct jffs2_node_frag),
66                       0, 0, NULL);
67    if (!node_frag_slab)
68        goto err;
69
70    inode_cache_slab = kmem_cache_create("jffs2_inode_cache",
71                         sizeof(struct jffs2_inode_cache),
72                         0, 0, NULL);
73    if (!inode_cache_slab)
74        goto err;
75
76#ifdef CONFIG_JFFS2_FS_XATTR
77    xattr_datum_cache = kmem_cache_create("jffs2_xattr_datum",
78                         sizeof(struct jffs2_xattr_datum),
79                         0, 0, NULL);
80    if (!xattr_datum_cache)
81        goto err;
82
83    xattr_ref_cache = kmem_cache_create("jffs2_xattr_ref",
84                       sizeof(struct jffs2_xattr_ref),
85                       0, 0, NULL);
86    if (!xattr_ref_cache)
87        goto err;
88#endif
89
90    return 0;
91 err:
92    jffs2_destroy_slab_caches();
93    return -ENOMEM;
94}
95
96void jffs2_destroy_slab_caches(void)
97{
98    if(full_dnode_slab)
99        kmem_cache_destroy(full_dnode_slab);
100    if(raw_dirent_slab)
101        kmem_cache_destroy(raw_dirent_slab);
102    if(raw_inode_slab)
103        kmem_cache_destroy(raw_inode_slab);
104    if(tmp_dnode_info_slab)
105        kmem_cache_destroy(tmp_dnode_info_slab);
106    if(raw_node_ref_slab)
107        kmem_cache_destroy(raw_node_ref_slab);
108    if(node_frag_slab)
109        kmem_cache_destroy(node_frag_slab);
110    if(inode_cache_slab)
111        kmem_cache_destroy(inode_cache_slab);
112#ifdef CONFIG_JFFS2_FS_XATTR
113    if (xattr_datum_cache)
114        kmem_cache_destroy(xattr_datum_cache);
115    if (xattr_ref_cache)
116        kmem_cache_destroy(xattr_ref_cache);
117#endif
118}
119
120struct jffs2_full_dirent *jffs2_alloc_full_dirent(int namesize)
121{
122    struct jffs2_full_dirent *ret;
123    ret = kmalloc(sizeof(struct jffs2_full_dirent) + namesize, GFP_KERNEL);
124    dbg_memalloc("%p\n", ret);
125    return ret;
126}
127
128void jffs2_free_full_dirent(struct jffs2_full_dirent *x)
129{
130    dbg_memalloc("%p\n", x);
131    kfree(x);
132}
133
134struct jffs2_full_dnode *jffs2_alloc_full_dnode(void)
135{
136    struct jffs2_full_dnode *ret;
137    ret = kmem_cache_alloc(full_dnode_slab, GFP_KERNEL);
138    dbg_memalloc("%p\n", ret);
139    return ret;
140}
141
142void jffs2_free_full_dnode(struct jffs2_full_dnode *x)
143{
144    dbg_memalloc("%p\n", x);
145    kmem_cache_free(full_dnode_slab, x);
146}
147
148struct jffs2_raw_dirent *jffs2_alloc_raw_dirent(void)
149{
150    struct jffs2_raw_dirent *ret;
151    ret = kmem_cache_alloc(raw_dirent_slab, GFP_KERNEL);
152    dbg_memalloc("%p\n", ret);
153    return ret;
154}
155
156void jffs2_free_raw_dirent(struct jffs2_raw_dirent *x)
157{
158    dbg_memalloc("%p\n", x);
159    kmem_cache_free(raw_dirent_slab, x);
160}
161
162struct jffs2_raw_inode *jffs2_alloc_raw_inode(void)
163{
164    struct jffs2_raw_inode *ret;
165    ret = kmem_cache_alloc(raw_inode_slab, GFP_KERNEL);
166    dbg_memalloc("%p\n", ret);
167    return ret;
168}
169
170void jffs2_free_raw_inode(struct jffs2_raw_inode *x)
171{
172    dbg_memalloc("%p\n", x);
173    kmem_cache_free(raw_inode_slab, x);
174}
175
176struct jffs2_tmp_dnode_info *jffs2_alloc_tmp_dnode_info(void)
177{
178    struct jffs2_tmp_dnode_info *ret;
179    ret = kmem_cache_alloc(tmp_dnode_info_slab, GFP_KERNEL);
180    dbg_memalloc("%p\n",
181        ret);
182    return ret;
183}
184
185void jffs2_free_tmp_dnode_info(struct jffs2_tmp_dnode_info *x)
186{
187    dbg_memalloc("%p\n", x);
188    kmem_cache_free(tmp_dnode_info_slab, x);
189}
190
191static struct jffs2_raw_node_ref *jffs2_alloc_refblock(void)
192{
193    struct jffs2_raw_node_ref *ret;
194
195    ret = kmem_cache_alloc(raw_node_ref_slab, GFP_KERNEL);
196    if (ret) {
197        int i = 0;
198        for (i=0; i < REFS_PER_BLOCK; i++) {
199            ret[i].flash_offset = REF_EMPTY_NODE;
200            ret[i].next_in_ino = NULL;
201        }
202        ret[i].flash_offset = REF_LINK_NODE;
203        ret[i].next_in_ino = NULL;
204    }
205    return ret;
206}
207
208int jffs2_prealloc_raw_node_refs(struct jffs2_sb_info *c,
209                 struct jffs2_eraseblock *jeb, int nr)
210{
211    struct jffs2_raw_node_ref **p, *ref;
212    int i = nr;
213
214    dbg_memalloc("%d\n", nr);
215
216    p = &jeb->last_node;
217    ref = *p;
218
219    dbg_memalloc("Reserving %d refs for block @0x%08x\n", nr, jeb->offset);
220
221    /* If jeb->last_node is really a valid node then skip over it */
222    if (ref && ref->flash_offset != REF_EMPTY_NODE)
223        ref++;
224
225    while (i) {
226        if (!ref) {
227            dbg_memalloc("Allocating new refblock linked from %p\n", p);
228            ref = *p = jffs2_alloc_refblock();
229            if (!ref)
230                return -ENOMEM;
231        }
232        if (ref->flash_offset == REF_LINK_NODE) {
233            p = &ref->next_in_ino;
234            ref = *p;
235            continue;
236        }
237        i--;
238        ref++;
239    }
240    jeb->allocated_refs = nr;
241
242    dbg_memalloc("Reserved %d refs for block @0x%08x, last_node is %p (%08x,%p)\n",
243          nr, jeb->offset, jeb->last_node, jeb->last_node->flash_offset,
244          jeb->last_node->next_in_ino);
245
246    return 0;
247}
248
249void jffs2_free_refblock(struct jffs2_raw_node_ref *x)
250{
251    dbg_memalloc("%p\n", x);
252    kmem_cache_free(raw_node_ref_slab, x);
253}
254
255struct jffs2_node_frag *jffs2_alloc_node_frag(void)
256{
257    struct jffs2_node_frag *ret;
258    ret = kmem_cache_alloc(node_frag_slab, GFP_KERNEL);
259    dbg_memalloc("%p\n", ret);
260    return ret;
261}
262
263void jffs2_free_node_frag(struct jffs2_node_frag *x)
264{
265    dbg_memalloc("%p\n", x);
266    kmem_cache_free(node_frag_slab, x);
267}
268
269struct jffs2_inode_cache *jffs2_alloc_inode_cache(void)
270{
271    struct jffs2_inode_cache *ret;
272    ret = kmem_cache_alloc(inode_cache_slab, GFP_KERNEL);
273    dbg_memalloc("%p\n", ret);
274    return ret;
275}
276
277void jffs2_free_inode_cache(struct jffs2_inode_cache *x)
278{
279    dbg_memalloc("%p\n", x);
280    kmem_cache_free(inode_cache_slab, x);
281}
282
283#ifdef CONFIG_JFFS2_FS_XATTR
284struct jffs2_xattr_datum *jffs2_alloc_xattr_datum(void)
285{
286    struct jffs2_xattr_datum *xd;
287    xd = kmem_cache_zalloc(xattr_datum_cache, GFP_KERNEL);
288    dbg_memalloc("%p\n", xd);
289
290    xd->class = RAWNODE_CLASS_XATTR_DATUM;
291    xd->node = (void *)xd;
292    INIT_LIST_HEAD(&xd->xindex);
293    return xd;
294}
295
296void jffs2_free_xattr_datum(struct jffs2_xattr_datum *xd)
297{
298    dbg_memalloc("%p\n", xd);
299    kmem_cache_free(xattr_datum_cache, xd);
300}
301
302struct jffs2_xattr_ref *jffs2_alloc_xattr_ref(void)
303{
304    struct jffs2_xattr_ref *ref;
305    ref = kmem_cache_zalloc(xattr_ref_cache, GFP_KERNEL);
306    dbg_memalloc("%p\n", ref);
307
308    ref->class = RAWNODE_CLASS_XATTR_REF;
309    ref->node = (void *)ref;
310    return ref;
311}
312
313void jffs2_free_xattr_ref(struct jffs2_xattr_ref *ref)
314{
315    dbg_memalloc("%p\n", ref);
316    kmem_cache_free(xattr_ref_cache, ref);
317}
318#endif
319

Archive Download this file



interactive