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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 | /* * JFFS2 -- Journalling Flash File System, Version 2. * * Copyright (C) 2001-2003 Red Hat, Inc. * Created by Arjan van de Ven <arjanv@redhat.com> * * Copyright (C) 2004 Ferenc Havasi <havasi@inf.u-szeged.hu>, * University of Szeged, Hungary * * For licensing information, see the file 'LICENCE' in this directory. * * $Id: compr.c,v 1.42 2004/08/07 21:56:08 dwmw2 Exp $ * */ #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; } #ifdef CONFIG_JFFS2_PROC #define JFFS2_STAT_BUF_SIZE 16000 char *jffs2_list_compressors(void) { struct jffs2_compressor *this; char *buf, *act_buf; act_buf = buf = kmalloc(JFFS2_STAT_BUF_SIZE,GFP_KERNEL); list_for_each_entry(this, &jffs2_compressor_list, list) { act_buf += sprintf(act_buf, "%10s priority:%d ", this->name, this->priority); if ((this->disabled)||(!this->compress)) act_buf += sprintf(act_buf,"disabled"); else act_buf += sprintf(act_buf,"enabled"); act_buf += sprintf(act_buf,"\n"); } return buf; } char *jffs2_stats(void) { struct jffs2_compressor *this; char *buf, *act_buf; act_buf = buf = kmalloc(JFFS2_STAT_BUF_SIZE,GFP_KERNEL); act_buf += sprintf(act_buf,"JFFS2 compressor statistics:\n"); act_buf += sprintf(act_buf,"%10s ","none"); act_buf += sprintf(act_buf,"compr: %d blocks (%d) decompr: %d blocks\n", none_stat_compr_blocks, none_stat_compr_size, none_stat_decompr_blocks); spin_lock(&jffs2_compressor_list_lock); list_for_each_entry(this, &jffs2_compressor_list, list) { act_buf += sprintf(act_buf,"%10s ",this->name); if ((this->disabled)||(!this->compress)) act_buf += sprintf(act_buf,"- "); else act_buf += sprintf(act_buf,"+ "); act_buf += sprintf(act_buf,"compr: %d blocks (%d/%d) decompr: %d blocks ", this->stat_compr_blocks, this->stat_compr_new_size, this->stat_compr_orig_size, this->stat_decompr_blocks); act_buf += sprintf(act_buf,"\n"); } spin_unlock(&jffs2_compressor_list_lock); return buf; } char *jffs2_get_compression_mode_name(void) { switch (jffs2_compression_mode) { case JFFS2_COMPR_MODE_NONE: return "none"; case JFFS2_COMPR_MODE_PRIORITY: return "priority"; case JFFS2_COMPR_MODE_SIZE: return "size"; } return "unkown"; } int jffs2_set_compression_mode_name(const char *name) { if (!strcmp("none",name)) { jffs2_compression_mode = JFFS2_COMPR_MODE_NONE; return 0; } if (!strcmp("priority",name)) { jffs2_compression_mode = JFFS2_COMPR_MODE_PRIORITY; return 0; } if (!strcmp("size",name)) { jffs2_compression_mode = JFFS2_COMPR_MODE_SIZE; return 0; } return 1; } static int jffs2_compressor_Xable(const char *name, int disabled) { struct jffs2_compressor *this; spin_lock(&jffs2_compressor_list_lock); list_for_each_entry(this, &jffs2_compressor_list, list) { if (!strcmp(this->name, name)) { this->disabled = disabled; spin_unlock(&jffs2_compressor_list_lock); return 0; } } spin_unlock(&jffs2_compressor_list_lock); printk(KERN_WARNING "JFFS2: compressor %s not found.\n",name); return 1; } int jffs2_enable_compressor_name(const char *name) { return jffs2_compressor_Xable(name, 0); } int jffs2_disable_compressor_name(const char *name) { return jffs2_compressor_Xable(name, 1); } int jffs2_set_compressor_priority(const char *name, int priority) { struct jffs2_compressor *this,*comp; spin_lock(&jffs2_compressor_list_lock); list_for_each_entry(this, &jffs2_compressor_list, list) { if (!strcmp(this->name, name)) { this->priority = priority; comp = this; goto reinsert; } } spin_unlock(&jffs2_compressor_list_lock); printk(KERN_WARNING "JFFS2: compressor %s not found.\n",name); return 1; reinsert: /* list is sorted in the order of priority, so if we change it we have to reinsert it into the good place */ list_del(&comp->list); list_for_each_entry(this, &jffs2_compressor_list, list) { if (this->priority < comp->priority) { list_add(&comp->list, this->list.prev); spin_unlock(&jffs2_compressor_list_lock); return 0; } } list_add_tail(&comp->list, &jffs2_compressor_list); spin_unlock(&jffs2_compressor_list_lock); return 0; } #endif void jffs2_free_comprbuf(unsigned char *comprbuf, unsigned char *orig) { if (orig != comprbuf) kfree(comprbuf); } int 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 #ifdef CONFIG_JFFS2_LZARI jffs2_lzari_init(); #endif #ifdef CONFIG_JFFS2_LZO jffs2_lzo_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_LZO jffs2_lzo_exit(); #endif #ifdef CONFIG_JFFS2_LZARI jffs2_lzari_exit(); #endif #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; } |