[deliverable/linux.git] / fs / jffs2 / compr.c

/*
 * JFFS2 -- Journalling Flash File System, Version 2.
 *
 * Copyright © 2001-2007 Red Hat, Inc.
 * Created by Arjan van de Ven <arjanv@redhat.com>
 *
 * Copyright © 2004 Ferenc Havasi <havasi@inf.u-szeged.hu>,
 *                    University of Szeged, Hungary
 *
 * For licensing information, see the file 'LICENCE' in this directory.
 *
 */

#include "compr.h"

static DEFINE_SPINLOCK(jffs2_compressor_list_lock);

/* Available compressors are on this list */
static LIST_HEAD(jffs2_compressor_list);

/* Actual compression mode */
static int jffs2_compression_mode = JFFS2_COMPR_MODE_PRIORITY;

/* Statistics for blocks stored without compression */
static uint32_t none_stat_compr_blocks=0,none_stat_decompr_blocks=0,none_stat_compr_size=0;

/* jffs2_compress:
 * @data: Pointer to uncompressed data
 * @cdata: Pointer to returned pointer to buffer for compressed data
 * @datalen: On entry, holds the amount of data available for compression.
 *	On exit, expected to hold the amount of data actually compressed.
 * @cdatalen: On entry, holds the amount of space available for compressed
 *	data. On exit, expected to hold the actual size of the compressed
 *	data.
 *
 * Returns: Lower byte to be stored with data indicating compression type used.
 * Zero is used to show that the data could not be compressed - the
 * compressed version was actually larger than the original.
 * Upper byte will be used later. (soon)
 *
 * If the cdata buffer isn't large enough to hold all the uncompressed data,
 * jffs2_compress should compress as much as will fit, and should set
 * *datalen accordingly to show the amount of data which were compressed.
 */
uint16_t jffs2_compress(struct jffs2_sb_info *c, struct jffs2_inode_info *f,
			     unsigned char *data_in, unsigned char **cpage_out,
			     uint32_t *datalen, uint32_t *cdatalen)
{
	int ret = JFFS2_COMPR_NONE;
        int compr_ret;
        struct jffs2_compressor *this, *best=NULL;
        unsigned char *output_buf = NULL, *tmp_buf;
        uint32_t orig_slen, orig_dlen;
        uint32_t best_slen=0, best_dlen=0;

        switch (jffs2_compression_mode) {
        case JFFS2_COMPR_MODE_NONE:
                break;
        case JFFS2_COMPR_MODE_PRIORITY:
                output_buf = kmalloc(*cdatalen,GFP_KERNEL);
                if (!output_buf) {
                        printk(KERN_WARNING "JFFS2: No memory for compressor allocation. Compression failed.\n");
                        goto out;
                }
                orig_slen = *datalen;
                orig_dlen = *cdatalen;
                spin_lock(&jffs2_compressor_list_lock);
                list_for_each_entry(this, &jffs2_compressor_list, list) {
                        /* Skip decompress-only backwards-compatibility and disabled modules */
                        if ((!this->compress)||(this->disabled))
                                continue;

                        this->usecount++;
                        spin_unlock(&jffs2_compressor_list_lock);
                        *datalen  = orig_slen;
                        *cdatalen = orig_dlen;
                        compr_ret = this->compress(data_in, output_buf, datalen, cdatalen, NULL);
                        spin_lock(&jffs2_compressor_list_lock);
                        this->usecount--;
                        if (!compr_ret) {
                                ret = this->compr;
                                this->stat_compr_blocks++;
                                this->stat_compr_orig_size += *datalen;
                                this->stat_compr_new_size  += *cdatalen;
                                break;
                        }
                }
                spin_unlock(&jffs2_compressor_list_lock);
                if (ret == JFFS2_COMPR_NONE) kfree(output_buf);
                break;
        case JFFS2_COMPR_MODE_SIZE:
                orig_slen = *datalen;
                orig_dlen = *cdatalen;
                spin_lock(&jffs2_compressor_list_lock);
                list_for_each_entry(this, &jffs2_compressor_list, list) {
                        /* Skip decompress-only backwards-compatibility and disabled modules */
                        if ((!this->compress)||(this->disabled))
                                continue;
                        /* Allocating memory for output buffer if necessary */
                        if ((this->compr_buf_size<orig_dlen)&&(this->compr_buf)) {
                                spin_unlock(&jffs2_compressor_list_lock);
                                kfree(this->compr_buf);
                                spin_lock(&jffs2_compressor_list_lock);
                                this->compr_buf_size=0;
                                this->compr_buf=NULL;
                        }
                        if (!this->compr_buf) {
                                spin_unlock(&jffs2_compressor_list_lock);
                                tmp_buf = kmalloc(orig_dlen,GFP_KERNEL);
                                spin_lock(&jffs2_compressor_list_lock);
                                if (!tmp_buf) {
                                        printk(KERN_WARNING "JFFS2: No memory for compressor allocation. (%d bytes)\n",orig_dlen);
                                        continue;
                                }
                                else {
                                        this->compr_buf = tmp_buf;
                                        this->compr_buf_size = orig_dlen;
                                }
                        }
                        this->usecount++;
                        spin_unlock(&jffs2_compressor_list_lock);
                        *datalen  = orig_slen;
                        *cdatalen = orig_dlen;
                        compr_ret = this->compress(data_in, this->compr_buf, datalen, cdatalen, NULL);
                        spin_lock(&jffs2_compressor_list_lock);
                        this->usecount--;
                        if (!compr_ret) {
                                if ((!best_dlen)||(best_dlen>*cdatalen)) {
                                        best_dlen = *cdatalen;
                                        best_slen = *datalen;
                                        best = this;
                                }
                        }
                }
                if (best_dlen) {
                        *cdatalen = best_dlen;
                        *datalen  = best_slen;
                        output_buf = best->compr_buf;
                        best->compr_buf = NULL;
                        best->compr_buf_size = 0;
                        best->stat_compr_blocks++;
                        best->stat_compr_orig_size += best_slen;
                        best->stat_compr_new_size  += best_dlen;
                        ret = best->compr;
                }
                spin_unlock(&jffs2_compressor_list_lock);
                break;
        default:
                printk(KERN_ERR "JFFS2: unknow compression mode.\n");
        }
 out:
        if (ret == JFFS2_COMPR_NONE) {
	        *cpage_out = data_in;
	        *datalen = *cdatalen;
                none_stat_compr_blocks++;
                none_stat_compr_size += *datalen;
        }
        else {
                *cpage_out = output_buf;
        }
	return ret;
}

int jffs2_decompress(struct jffs2_sb_info *c, struct jffs2_inode_info *f,
		     uint16_t comprtype, unsigned char *cdata_in,
		     unsigned char *data_out, uint32_t cdatalen, uint32_t datalen)
{
        struct jffs2_compressor *this;
        int ret;

	/* Older code had a bug where it would write non-zero 'usercompr'
	   fields. Deal with it. */
	if ((comprtype & 0xff) <= JFFS2_COMPR_ZLIB)
		comprtype &= 0xff;

	switch (comprtype & 0xff) {
	case JFFS2_COMPR_NONE:
		/* This should be special-cased elsewhere, but we might as well deal with it */
		memcpy(data_out, cdata_in, datalen);
                none_stat_decompr_blocks++;
		break;
	case JFFS2_COMPR_ZERO:
		memset(data_out, 0, datalen);
		break;
	default:
                spin_lock(&jffs2_compressor_list_lock);
                list_for_each_entry(this, &jffs2_compressor_list, list) {
                        if (comprtype == this->compr) {
                                this->usecount++;
                                spin_unlock(&jffs2_compressor_list_lock);
                                ret = this->decompress(cdata_in, data_out, cdatalen, datalen, NULL);
                                spin_lock(&jffs2_compressor_list_lock);
                                if (ret) {
                                        printk(KERN_WARNING "Decompressor \"%s\" returned %d\n", this->name, ret);
                                }
                                else {
                                        this->stat_decompr_blocks++;
                                }
                                this->usecount--;
                                spin_unlock(&jffs2_compressor_list_lock);
                                return ret;
                        }
                }
		printk(KERN_WARNING "JFFS2 compression type 0x%02x not available.\n", comprtype);
                spin_unlock(&jffs2_compressor_list_lock);
		return -EIO;
	}
	return 0;
}

int jffs2_register_compressor(struct jffs2_compressor *comp)
{
        struct jffs2_compressor *this;

        if (!comp->name) {
                printk(KERN_WARNING "NULL compressor name at registering JFFS2 compressor. Failed.\n");
                return -1;
        }
        comp->compr_buf_size=0;
        comp->compr_buf=NULL;
        comp->usecount=0;
        comp->stat_compr_orig_size=0;
        comp->stat_compr_new_size=0;
        comp->stat_compr_blocks=0;
        comp->stat_decompr_blocks=0;
        D1(printk(KERN_DEBUG "Registering JFFS2 compressor \"%s\"\n", comp->name));

        spin_lock(&jffs2_compressor_list_lock);

        list_for_each_entry(this, &jffs2_compressor_list, list) {
                if (this->priority < comp->priority) {
                        list_add(&comp->list, this->list.prev);
                        goto out;
                }
        }
        list_add_tail(&comp->list, &jffs2_compressor_list);
out:
        D2(list_for_each_entry(this, &jffs2_compressor_list, list) {
                printk(KERN_DEBUG "Compressor \"%s\", prio %d\n", this->name, this->priority);
        })

        spin_unlock(&jffs2_compressor_list_lock);

        return 0;
}

int jffs2_unregister_compressor(struct jffs2_compressor *comp)
{
        D2(struct jffs2_compressor *this;)

        D1(printk(KERN_DEBUG "Unregistering JFFS2 compressor \"%s\"\n", comp->name));

        spin_lock(&jffs2_compressor_list_lock);

        if (comp->usecount) {
                spin_unlock(&jffs2_compressor_list_lock);
                printk(KERN_WARNING "JFFS2: Compressor modul is in use. Unregister failed.\n");
                return -1;
        }
        list_del(&comp->list);

        D2(list_for_each_entry(this, &jffs2_compressor_list, list) {
                printk(KERN_DEBUG "Compressor \"%s\", prio %d\n", this->name, this->priority);
        })
        spin_unlock(&jffs2_compressor_list_lock);
        return 0;
}

void jffs2_free_comprbuf(unsigned char *comprbuf, unsigned char *orig)
{
        if (orig != comprbuf)
                kfree(comprbuf);
}

int __init jffs2_compressors_init(void)
{
/* Registering compressors */
#ifdef CONFIG_JFFS2_ZLIB
        jffs2_zlib_init();
#endif
#ifdef CONFIG_JFFS2_RTIME
        jffs2_rtime_init();
#endif
#ifdef CONFIG_JFFS2_RUBIN
        jffs2_rubinmips_init();
        jffs2_dynrubin_init();
#endif
/* Setting default compression mode */
#ifdef CONFIG_JFFS2_CMODE_NONE
        jffs2_compression_mode = JFFS2_COMPR_MODE_NONE;
        D1(printk(KERN_INFO "JFFS2: default compression mode: none\n");)
#else
#ifdef CONFIG_JFFS2_CMODE_SIZE
        jffs2_compression_mode = JFFS2_COMPR_MODE_SIZE;
        D1(printk(KERN_INFO "JFFS2: default compression mode: size\n");)
#else
        D1(printk(KERN_INFO "JFFS2: default compression mode: priority\n");)
#endif
#endif
        return 0;
}

int jffs2_compressors_exit(void)
{
/* Unregistering compressors */
#ifdef CONFIG_JFFS2_RUBIN
        jffs2_dynrubin_exit();
        jffs2_rubinmips_exit();
#endif
#ifdef CONFIG_JFFS2_RTIME
        jffs2_rtime_exit();
#endif
#ifdef CONFIG_JFFS2_ZLIB
        jffs2_zlib_exit();
#endif
        return 0;
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* JFFS2 -- Journalling Flash File System, Version 2.
	3	*
c00c310e	4	* Copyright © 2001-2007 Red Hat, Inc.
1da177e4 LT	5	* Created by Arjan van de Ven <arjanv@redhat.com>
1da177e4 LT	6	*
c00c310e	7	* Copyright © 2004 Ferenc Havasi <havasi@inf.u-szeged.hu>,
1da177e4 LT	8	* University of Szeged, Hungary
	9	*
	10	* For licensing information, see the file 'LICENCE' in this directory.
	11	*
1da177e4 LT	12	*/
	13
	14	#include "compr.h"
	15
	16	static DEFINE_SPINLOCK(jffs2_compressor_list_lock);
	17
	18	/* Available compressors are on this list */
	19	static LIST_HEAD(jffs2_compressor_list);
	20
	21	/* Actual compression mode */
	22	static int jffs2_compression_mode = JFFS2_COMPR_MODE_PRIORITY;
	23
	24	/* Statistics for blocks stored without compression */
	25	static uint32_t none_stat_compr_blocks=0,none_stat_decompr_blocks=0,none_stat_compr_size=0;
	26
	27	/* jffs2_compress:
	28	* @data: Pointer to uncompressed data
	29	* @cdata: Pointer to returned pointer to buffer for compressed data
	30	* @datalen: On entry, holds the amount of data available for compression.
	31	* On exit, expected to hold the amount of data actually compressed.
	32	* @cdatalen: On entry, holds the amount of space available for compressed
	33	* data. On exit, expected to hold the actual size of the compressed
	34	* data.
	35	*
	36	* Returns: Lower byte to be stored with data indicating compression type used.
182ec4ee	37	* Zero is used to show that the data could not be compressed - the
1da177e4 LT	38	* compressed version was actually larger than the original.
	39	* Upper byte will be used later. (soon)
	40	*
	41	* If the cdata buffer isn't large enough to hold all the uncompressed data,
182ec4ee	42	* jffs2_compress should compress as much as will fit, and should set
1da177e4 LT	43	* *datalen accordingly to show the amount of data which were compressed.
	44	*/
	45	uint16_t jffs2_compress(struct jffs2_sb_info c, struct jffs2_inode_info f,
182ec4ee	46	unsigned char data_in, unsigned char *cpage_out,
1da177e4 LT	47	uint32_t datalen, uint32_t cdatalen)
	48	{
	49	int ret = JFFS2_COMPR_NONE;
	50	int compr_ret;
	51	struct jffs2_compressor this, best=NULL;
	52	unsigned char output_buf = NULL, tmp_buf;
	53	uint32_t orig_slen, orig_dlen;
	54	uint32_t best_slen=0, best_dlen=0;
	55
	56	switch (jffs2_compression_mode) {
	57	case JFFS2_COMPR_MODE_NONE:
	58	break;
	59	case JFFS2_COMPR_MODE_PRIORITY:
	60	output_buf = kmalloc(*cdatalen,GFP_KERNEL);
	61	if (!output_buf) {
	62	printk(KERN_WARNING "JFFS2: No memory for compressor allocation. Compression failed.\n");
	63	goto out;
	64	}
	65	orig_slen = *datalen;
	66	orig_dlen = *cdatalen;
	67	spin_lock(&jffs2_compressor_list_lock);
	68	list_for_each_entry(this, &jffs2_compressor_list, list) {
	69	/* Skip decompress-only backwards-compatibility and disabled modules */
	70	if ((!this->compress)\|\|(this->disabled))
	71	continue;
	72
	73	this->usecount++;
	74	spin_unlock(&jffs2_compressor_list_lock);
	75	*datalen = orig_slen;
	76	*cdatalen = orig_dlen;
	77	compr_ret = this->compress(data_in, output_buf, datalen, cdatalen, NULL);
	78	spin_lock(&jffs2_compressor_list_lock);
	79	this->usecount--;
	80	if (!compr_ret) {
	81	ret = this->compr;
	82	this->stat_compr_blocks++;
	83	this->stat_compr_orig_size += *datalen;
	84	this->stat_compr_new_size += *cdatalen;
	85	break;
	86	}
	87	}
	88	spin_unlock(&jffs2_compressor_list_lock);
	89	if (ret == JFFS2_COMPR_NONE) kfree(output_buf);
	90	break;
	91	case JFFS2_COMPR_MODE_SIZE:
	92	orig_slen = *datalen;
	93	orig_dlen = *cdatalen;
	94	spin_lock(&jffs2_compressor_list_lock);
	95	list_for_each_entry(this, &jffs2_compressor_list, list) {
	96	/* Skip decompress-only backwards-compatibility and disabled modules */
	97	if ((!this->compress)\|\|(this->disabled))
	98	continue;
	99	/* Allocating memory for output buffer if necessary */
	100	if ((this->compr_buf_size<orig_dlen)&&(this->compr_buf)) {
	101	spin_unlock(&jffs2_compressor_list_lock);
	102	kfree(this->compr_buf);
	103	spin_lock(&jffs2_compressor_list_lock);
	104	this->compr_buf_size=0;
	105	this->compr_buf=NULL;
	106	}
	107	if (!this->compr_buf) {
	108	spin_unlock(&jffs2_compressor_list_lock);
	109	tmp_buf = kmalloc(orig_dlen,GFP_KERNEL);
	110	spin_lock(&jffs2_compressor_list_lock);
111	if (!tmp_buf) {
112	printk(KERN_WARNING "JFFS2: No memory for compressor allocation. (%d bytes)\n",orig_dlen);
113	continue;
114	}
115	else {
116	this->compr_buf = tmp_buf;
117	this->compr_buf_size = orig_dlen;
118	}
119	}
120	this->usecount++;
121	spin_unlock(&jffs2_compressor_list_lock);
122	*datalen = orig_slen;
123	*cdatalen = orig_dlen;
124	compr_ret = this->compress(data_in, this->compr_buf, datalen, cdatalen, NULL);
125	spin_lock(&jffs2_compressor_list_lock);
126	this->usecount--;
127	if (!compr_ret) {
128	if ((!best_dlen)\|\|(best_dlen>*cdatalen)) {
129	best_dlen = *cdatalen;
130	best_slen = *datalen;
131	best = this;
132	}
133	}
134	}
135	if (best_dlen) {
136	*cdatalen = best_dlen;
137	*datalen = best_slen;
138	output_buf = best->compr_buf;
139	best->compr_buf = NULL;
140	best->compr_buf_size = 0;
141	best->stat_compr_blocks++;
142	best->stat_compr_orig_size += best_slen;
143	best->stat_compr_new_size += best_dlen;
144	ret = best->compr;
145	}
146	spin_unlock(&jffs2_compressor_list_lock);
147	break;
148	default:
149	printk(KERN_ERR "JFFS2: unknow compression mode.\n");
150	}
151	out:
152	if (ret == JFFS2_COMPR_NONE) {
153	*cpage_out = data_in;
154	datalen = cdatalen;
155	none_stat_compr_blocks++;
156	none_stat_compr_size += *datalen;
157	}
158	else {
159	*cpage_out = output_buf;
160	}
161	return ret;
162	}
163
164	int jffs2_decompress(struct jffs2_sb_info c, struct jffs2_inode_info f,
182ec4ee	165	uint16_t comprtype, unsigned char *cdata_in,
1da177e4 LT	166	unsigned char *data_out, uint32_t cdatalen, uint32_t datalen)
	167	{
	168	struct jffs2_compressor *this;
	169	int ret;
	170
	171	/* Older code had a bug where it would write non-zero 'usercompr'
	172	fields. Deal with it. */
	173	if ((comprtype & 0xff) <= JFFS2_COMPR_ZLIB)
	174	comprtype &= 0xff;
	175
	176	switch (comprtype & 0xff) {
	177	case JFFS2_COMPR_NONE:
	178	/* This should be special-cased elsewhere, but we might as well deal with it */
	179	memcpy(data_out, cdata_in, datalen);
	180	none_stat_decompr_blocks++;
	181	break;
	182	case JFFS2_COMPR_ZERO:
	183	memset(data_out, 0, datalen);
	184	break;
	185	default:
	186	spin_lock(&jffs2_compressor_list_lock);
	187	list_for_each_entry(this, &jffs2_compressor_list, list) {
	188	if (comprtype == this->compr) {
	189	this->usecount++;
	190	spin_unlock(&jffs2_compressor_list_lock);
	191	ret = this->decompress(cdata_in, data_out, cdatalen, datalen, NULL);
	192	spin_lock(&jffs2_compressor_list_lock);
	193	if (ret) {
	194	printk(KERN_WARNING "Decompressor \"%s\" returned %d\n", this->name, ret);
	195	}
	196	else {
	197	this->stat_decompr_blocks++;
	198	}
	199	this->usecount--;
	200	spin_unlock(&jffs2_compressor_list_lock);
	201	return ret;
	202	}
	203	}
	204	printk(KERN_WARNING "JFFS2 compression type 0x%02x not available.\n", comprtype);
	205	spin_unlock(&jffs2_compressor_list_lock);
	206	return -EIO;
	207	}
	208	return 0;
	209	}
	210
	211	int jffs2_register_compressor(struct jffs2_compressor *comp)
	212	{
	213	struct jffs2_compressor *this;
	214
	215	if (!comp->name) {
	216	printk(KERN_WARNING "NULL compressor name at registering JFFS2 compressor. Failed.\n");
	217	return -1;
	218	}
	219	comp->compr_buf_size=0;
	220	comp->compr_buf=NULL;
	221	comp->usecount=0;
	222	comp->stat_compr_orig_size=0;
	223	comp->stat_compr_new_size=0;
	224	comp->stat_compr_blocks=0;
	225	comp->stat_decompr_blocks=0;
	226	D1(printk(KERN_DEBUG "Registering JFFS2 compressor \"%s\"\n", comp->name));
	227
	228	spin_lock(&jffs2_compressor_list_lock);
	229
230	list_for_each_entry(this, &jffs2_compressor_list, list) {
231	if (this->priority < comp->priority) {
232	list_add(&comp->list, this->list.prev);
233	goto out;
234	}
235	}
236	list_add_tail(&comp->list, &jffs2_compressor_list);
237	out:
238	D2(list_for_each_entry(this, &jffs2_compressor_list, list) {
239	printk(KERN_DEBUG "Compressor \"%s\", prio %d\n", this->name, this->priority);
240	})
241
242	spin_unlock(&jffs2_compressor_list_lock);
243
244	return 0;
245	}
246
247	int jffs2_unregister_compressor(struct jffs2_compressor *comp)
248	{
249	D2(struct jffs2_compressor *this;)
250
251	D1(printk(KERN_DEBUG "Unregistering JFFS2 compressor \"%s\"\n", comp->name));
252
253	spin_lock(&jffs2_compressor_list_lock);
254
255	if (comp->usecount) {
256	spin_unlock(&jffs2_compressor_list_lock);
257	printk(KERN_WARNING "JFFS2: Compressor modul is in use. Unregister failed.\n");
258	return -1;
259	}
260	list_del(&comp->list);
261
262	D2(list_for_each_entry(this, &jffs2_compressor_list, list) {
263	printk(KERN_DEBUG "Compressor \"%s\", prio %d\n", this->name, this->priority);
264	})
265	spin_unlock(&jffs2_compressor_list_lock);
266	return 0;
267	}
268
1da177e4 LT	269	void jffs2_free_comprbuf(unsigned char comprbuf, unsigned char orig)
	270	{
	271	if (orig != comprbuf)
	272	kfree(comprbuf);
	273	}
	274
7d2beb13	275	int __init jffs2_compressors_init(void)
1da177e4 LT	276	{
	277	/* Registering compressors */
	278	#ifdef CONFIG_JFFS2_ZLIB
	279	jffs2_zlib_init();
	280	#endif
	281	#ifdef CONFIG_JFFS2_RTIME
	282	jffs2_rtime_init();
	283	#endif
	284	#ifdef CONFIG_JFFS2_RUBIN
	285	jffs2_rubinmips_init();
	286	jffs2_dynrubin_init();
	287	#endif
1da177e4 LT	288	/* Setting default compression mode */
	289	#ifdef CONFIG_JFFS2_CMODE_NONE
	290	jffs2_compression_mode = JFFS2_COMPR_MODE_NONE;
	291	D1(printk(KERN_INFO "JFFS2: default compression mode: none\n");)
	292	#else
	293	#ifdef CONFIG_JFFS2_CMODE_SIZE
	294	jffs2_compression_mode = JFFS2_COMPR_MODE_SIZE;
	295	D1(printk(KERN_INFO "JFFS2: default compression mode: size\n");)
	296	#else
	297	D1(printk(KERN_INFO "JFFS2: default compression mode: priority\n");)
	298	#endif
	299	#endif
	300	return 0;
	301	}
	302
3bcc86f5	303	int jffs2_compressors_exit(void)
1da177e4 LT	304	{
1da177e4 LT	305	/* Unregistering compressors */
1da177e4 LT	306	#ifdef CONFIG_JFFS2_RUBIN
	307	jffs2_dynrubin_exit();
	308	jffs2_rubinmips_exit();
	309	#endif
	310	#ifdef CONFIG_JFFS2_RTIME
	311	jffs2_rtime_exit();
	312	#endif
	313	#ifdef CONFIG_JFFS2_ZLIB
	314	jffs2_zlib_exit();
	315	#endif
	316	return 0;
	317	}