fs/jffs2/compr.c

11  * For licensing information, see the file 'LICENCE' in this directory.
21 /* Available compressors are on this list */
32  * Return 1 to use this compression
34 static int jffs2_is_best_compression(struct jffs2_compressor *this,
43 		if ((this->compr == JFFS2_COMPR_LZO) && (bestsize > size))
47 		if ((this->compr == JFFS2_COMPR_LZO) && (bestsize > (size * FAVOUR_LZO_PERCENT / 100)))
77 	struct jffs2_compressor *this;
90 	list_for_each_entry(this, &jffs2_compressor_list, list) {
92 		if (!this->compress || this->disabled)
96 		if (compr && (compr != this->compr))
103 		this->usecount++;
108 		err = this->compress(data_in, output_buf, datalen, cdatalen);
111 		this->usecount--;
114 			ret = this->compr;
115 			this->stat_compr_blocks++;
116 			this->stat_compr_orig_size += *datalen;
117 			this->stat_compr_new_size += *cdatalen;
154 	struct jffs2_compressor *this, *best=NULL;
176 		list_for_each_entry(this, &jffs2_compressor_list, list) {
178 			if ((!this->compress)||(this->disabled))
181 			if ((this->compr_buf_size < orig_slen) && (this->compr_buf)) {
183 				kfree(this->compr_buf);
185 				this->compr_buf_size=0;
186 				this->compr_buf=NULL;
188 			if (!this->compr_buf) {
198 					this->compr_buf = tmp_buf;
199 					this->compr_buf_size = orig_slen;
202 			this->usecount++;
206 			compr_ret = this->compress(data_in, this->compr_buf, datalen, cdatalen);
208 			this->usecount--;
210 				if (((!best_dlen) || jffs2_is_best_compression(this, best, *cdatalen, best_dlen))
214 					best = this;
257 	struct jffs2_compressor *this;
276 		list_for_each_entry(this, &jffs2_compressor_list, list) {
277 			if (comprtype == this->compr) {
278 				this->usecount++;
280 				ret = this->decompress(cdata_in, data_out, cdatalen, datalen);
284 						this->name, ret);
287 					this->stat_decompr_blocks++;
289 				this->usecount--;
303 	struct jffs2_compressor *this;
320 	list_for_each_entry(this, &jffs2_compressor_list, list) {
321 		if (this->priority < comp->priority) {
322 			list_add(&comp->list, this->list.prev);
328 	D2(list_for_each_entry(this, &jffs2_compressor_list, list) {
329 		printk(KERN_DEBUG "Compressor \"%s\", prio %d\n", this->name, this->priority);
339 	D2(struct jffs2_compressor *this);
352 	D2(list_for_each_entry(this, &jffs2_compressor_list, list) {
353 		printk(KERN_DEBUG "Compressor \"%s\", prio %d\n", this->name, this->priority);