bitops.h revision 3034f62a0f9c31e6dce8bd1237cffd3851847250
1/* 2 * bitops.h --- Bitmap frobbing code. The byte swapping routines are 3 * also included here. 4 * 5 * Copyright (C) 1993, 1994, 1995, 1996 Theodore Ts'o. 6 * 7 * %Begin-Header% 8 * This file may be redistributed under the terms of the GNU Public 9 * License. 10 * %End-Header% 11 * 12 * i386 bitops operations taken from <asm/bitops.h>, Copyright 1992, 13 * Linus Torvalds. 14 */ 15 16 17extern int ext2fs_set_bit(int nr,void * addr); 18extern int ext2fs_clear_bit(int nr, void * addr); 19extern int ext2fs_test_bit(int nr, const void * addr); 20extern __u16 ext2fs_swab16(__u16 val); 21extern __u32 ext2fs_swab32(__u32 val); 22 23/* 24 * EXT2FS bitmap manipulation routines. 25 */ 26 27/* Support for sending warning messages from the inline subroutines */ 28extern const char *ext2fs_block_string; 29extern const char *ext2fs_inode_string; 30extern const char *ext2fs_mark_string; 31extern const char *ext2fs_unmark_string; 32extern const char *ext2fs_test_string; 33extern void ext2fs_warn_bitmap(errcode_t errcode, unsigned long arg, 34 const char *description); 35extern void ext2fs_warn_bitmap2(ext2fs_generic_bitmap bitmap, 36 int code, unsigned long arg); 37 38extern int ext2fs_mark_block_bitmap(ext2fs_block_bitmap bitmap, blk_t block); 39extern int ext2fs_unmark_block_bitmap(ext2fs_block_bitmap bitmap, 40 blk_t block); 41extern int ext2fs_test_block_bitmap(ext2fs_block_bitmap bitmap, blk_t block); 42 43extern int ext2fs_mark_inode_bitmap(ext2fs_inode_bitmap bitmap, ext2_ino_t inode); 44extern int ext2fs_unmark_inode_bitmap(ext2fs_inode_bitmap bitmap, 45 ext2_ino_t inode); 46extern int ext2fs_test_inode_bitmap(ext2fs_inode_bitmap bitmap, ext2_ino_t inode); 47 48extern void ext2fs_fast_mark_block_bitmap(ext2fs_block_bitmap bitmap, 49 blk_t block); 50extern void ext2fs_fast_unmark_block_bitmap(ext2fs_block_bitmap bitmap, 51 blk_t block); 52extern int ext2fs_fast_test_block_bitmap(ext2fs_block_bitmap bitmap, 53 blk_t block); 54 55extern void ext2fs_fast_mark_inode_bitmap(ext2fs_inode_bitmap bitmap, 56 ext2_ino_t inode); 57extern void ext2fs_fast_unmark_inode_bitmap(ext2fs_inode_bitmap bitmap, 58 ext2_ino_t inode); 59extern int ext2fs_fast_test_inode_bitmap(ext2fs_inode_bitmap bitmap, 60 ext2_ino_t inode); 61extern blk_t ext2fs_get_block_bitmap_start(ext2fs_block_bitmap bitmap); 62extern ext2_ino_t ext2fs_get_inode_bitmap_start(ext2fs_inode_bitmap bitmap); 63extern blk_t ext2fs_get_block_bitmap_end(ext2fs_block_bitmap bitmap); 64extern ext2_ino_t ext2fs_get_inode_bitmap_end(ext2fs_inode_bitmap bitmap); 65 66extern void ext2fs_mark_block_bitmap_range(ext2fs_block_bitmap bitmap, 67 blk_t block, int num); 68extern void ext2fs_unmark_block_bitmap_range(ext2fs_block_bitmap bitmap, 69 blk_t block, int num); 70extern int ext2fs_test_block_bitmap_range(ext2fs_block_bitmap bitmap, 71 blk_t block, int num); 72extern void ext2fs_fast_mark_block_bitmap_range(ext2fs_block_bitmap bitmap, 73 blk_t block, int num); 74extern void ext2fs_fast_unmark_block_bitmap_range(ext2fs_block_bitmap bitmap, 75 blk_t block, int num); 76extern int ext2fs_fast_test_block_bitmap_range(ext2fs_block_bitmap bitmap, 77 blk_t block, int num); 78extern void ext2fs_set_bitmap_padding(ext2fs_generic_bitmap map); 79 80/* 81 * The inline routines themselves... 82 * 83 * If NO_INLINE_FUNCS is defined, then we won't try to do inline 84 * functions at all; they will be included as normal functions in 85 * inline.c 86 */ 87#ifdef NO_INLINE_FUNCS 88#if (defined(__GNUC__) && (defined(__i386__) || defined(__i486__) || \ 89 defined(__i586__) || defined(__mc68000__) || \ 90 defined(__sparc__))) 91 /* This prevents bitops.c from trying to include the C */ 92 /* function version of these functions */ 93#define _EXT2_HAVE_ASM_BITOPS_ 94#endif 95#endif /* NO_INLINE_FUNCS */ 96 97#if (defined(INCLUDE_INLINE_FUNCS) || !defined(NO_INLINE_FUNCS)) 98#ifdef INCLUDE_INLINE_FUNCS 99#define _INLINE_ extern 100#else 101#ifdef __GNUC__ 102#define _INLINE_ extern __inline__ 103#else /* For Watcom C */ 104#define _INLINE_ extern inline 105#endif 106#endif 107 108#if ((defined __GNUC__) && (defined(__i386__) || defined(__i486__) || \ 109 defined(__i586__))) 110 111#define _EXT2_HAVE_ASM_BITOPS_ 112#define _EXT2_HAVE_ASM_SWAB_ 113 114/* 115 * These are done by inline assembly for speed reasons..... 116 * 117 * All bitoperations return 0 if the bit was cleared before the 118 * operation and != 0 if it was not. Bit 0 is the LSB of addr; bit 32 119 * is the LSB of (addr+1). 120 */ 121 122/* 123 * Some hacks to defeat gcc over-optimizations.. 124 */ 125struct __dummy_h { unsigned long a[100]; }; 126#define EXT2FS_ADDR (*(struct __dummy_h *) addr) 127#define EXT2FS_CONST_ADDR (*(const struct __dummy_h *) addr) 128 129_INLINE_ int ext2fs_set_bit(int nr, void * addr) 130{ 131 int oldbit; 132 133 __asm__ __volatile__("btsl %2,%1\n\tsbbl %0,%0" 134 :"=r" (oldbit),"=m" (EXT2FS_ADDR) 135 :"r" (nr)); 136 return oldbit; 137} 138 139_INLINE_ int ext2fs_clear_bit(int nr, void * addr) 140{ 141 int oldbit; 142 143 __asm__ __volatile__("btrl %2,%1\n\tsbbl %0,%0" 144 :"=r" (oldbit),"=m" (EXT2FS_ADDR) 145 :"r" (nr)); 146 return oldbit; 147} 148 149_INLINE_ int ext2fs_test_bit(int nr, const void * addr) 150{ 151 int oldbit; 152 153 __asm__ __volatile__("btl %2,%1\n\tsbbl %0,%0" 154 :"=r" (oldbit) 155 :"m" (EXT2FS_CONST_ADDR),"r" (nr)); 156 return oldbit; 157} 158 159#ifdef EXT2FS_ENABLE_SWAPFS 160_INLINE_ __u32 ext2fs_swab32(__u32 val) 161{ 162#ifdef EXT2FS_REQUIRE_486 163 __asm__("bswap %0" : "=r" (val) : "0" (val)); 164#else 165 __asm__("xchgb %b0,%h0\n\t" /* swap lower bytes */ 166 "rorl $16,%0\n\t" /* swap words */ 167 "xchgb %b0,%h0" /* swap higher bytes */ 168 :"=q" (val) 169 : "0" (val)); 170#endif 171 return val; 172} 173 174_INLINE_ __u16 ext2fs_swab16(__u16 val) 175{ 176 __asm__("xchgb %b0,%h0" /* swap bytes */ \ 177 : "=q" (val) \ 178 : "0" (val)); \ 179 return val; 180} 181#endif 182 183#undef EXT2FS_ADDR 184 185#endif /* i386 */ 186 187#ifdef __mc68000__ 188 189#define _EXT2_HAVE_ASM_BITOPS_ 190 191_INLINE_ int ext2fs_set_bit(int nr,void * addr) 192{ 193 char retval; 194 195 __asm__ __volatile__ ("bfset %2@{%1:#1}; sne %0" 196 : "=d" (retval) : "d" (nr^7), "a" (addr)); 197 198 return retval; 199} 200 201_INLINE_ int ext2fs_clear_bit(int nr, void * addr) 202{ 203 char retval; 204 205 __asm__ __volatile__ ("bfclr %2@{%1:#1}; sne %0" 206 : "=d" (retval) : "d" (nr^7), "a" (addr)); 207 208 return retval; 209} 210 211_INLINE_ int ext2fs_test_bit(int nr, const void * addr) 212{ 213 char retval; 214 215 __asm__ __volatile__ ("bftst %2@{%1:#1}; sne %0" 216 : "=d" (retval) : "d" (nr^7), "a" (addr)); 217 218 return retval; 219} 220 221#endif /* __mc68000__ */ 222 223#ifdef __sparc__ 224 225#define _EXT2_HAVE_ASM_BITOPS_ 226 227#ifndef EXT2_OLD_BITOPS 228 229/* 230 * Do the bitops so that we are compatible with the standard i386 231 * convention. 232 */ 233 234_INLINE_ int ext2fs_set_bit(int nr,void * addr) 235{ 236#if 1 237 int mask; 238 unsigned char *ADDR = (unsigned char *) addr; 239 240 ADDR += nr >> 3; 241 mask = 1 << (nr & 0x07); 242 __asm__ __volatile__("ldub [%0], %%g6\n\t" 243 "or %%g6, %2, %%g5\n\t" 244 "stb %%g5, [%0]\n\t" 245 "and %%g6, %2, %0\n" 246 : "=&r" (ADDR) 247 : "0" (ADDR), "r" (mask) 248 : "g5", "g6"); 249 return (int) ADDR; 250#else 251 int mask, retval; 252 unsigned char *ADDR = (unsigned char *) addr; 253 254 ADDR += nr >> 3; 255 mask = 1 << (nr & 0x07); 256 retval = (mask & *ADDR) != 0; 257 *ADDR |= mask; 258 return retval; 259#endif 260} 261 262_INLINE_ int ext2fs_clear_bit(int nr, void * addr) 263{ 264#if 1 265 int mask; 266 unsigned char *ADDR = (unsigned char *) addr; 267 268 ADDR += nr >> 3; 269 mask = 1 << (nr & 0x07); 270 __asm__ __volatile__("ldub [%0], %%g6\n\t" 271 "andn %%g6, %2, %%g5\n\t" 272 "stb %%g5, [%0]\n\t" 273 "and %%g6, %2, %0\n" 274 : "=&r" (ADDR) 275 : "0" (ADDR), "r" (mask) 276 : "g5", "g6"); 277 return (int) ADDR; 278 279#else 280 int mask, retval; 281 unsigned char *ADDR = (unsigned char *) addr; 282 283 ADDR += nr >> 3; 284 mask = 1 << (nr & 0x07); 285 retval = (mask & *ADDR) != 0; 286 *ADDR &= ~mask; 287 return retval; 288#endif 289} 290 291_INLINE_ int ext2fs_test_bit(int nr, const void * addr) 292{ 293 int mask; 294 const unsigned char *ADDR = (const unsigned char *) addr; 295 296 ADDR += nr >> 3; 297 mask = 1 << (nr & 0x07); 298 return ((mask & *ADDR) != 0); 299} 300 301#else 302 303/* Do things the old, unplesant way. */ 304 305_INLINE_ int ext2fs_set_bit(int nr, void *addr) 306{ 307 int mask, retval; 308 unsigned long *ADDR = (unsigned long *) addr; 309 310 ADDR += nr >> 5; 311 mask = 1 << (nr & 31); 312 retval = ((mask & *ADDR) != 0); 313 *ADDR |= mask; 314 return retval; 315} 316 317_INLINE_ int ext2fs_clear_bit(int nr, void *addr) 318{ 319 int mask, retval; 320 unsigned long *ADDR = (unsigned long *) addr; 321 322 ADDR += nr >> 5; 323 mask = 1 << (nr & 31); 324 retval = ((mask & *ADDR) != 0); 325 *ADDR &= ~mask; 326 return retval; 327} 328 329_INLINE_ int ext2fs_test_bit(int nr, const void *addr) 330{ 331 int mask; 332 const unsigned long *ADDR = (const unsigned long *) addr; 333 334 ADDR += nr >> 5; 335 mask = 1 << (nr & 31); 336 return ((mask & *ADDR) != 0); 337} 338#endif 339 340#endif /* __sparc__ */ 341 342#if !defined(_EXT2_HAVE_ASM_SWAB_) && defined(ENABLE_SWAPFS) 343 344_INLINE_ __u16 ext2fs_swab16(__u16 val) 345{ 346 return (val >> 8) | (val << 8); 347} 348 349_INLINE_ __u32 ext2fs_swab32(__u32 val) 350{ 351 return ((val>>24) | ((val>>8)&0xFF00) | 352 ((val<<8)&0xFF0000) | (val<<24)); 353} 354 355#endif /* !_EXT2_HAVE_ASM_SWAB */ 356 357/* These two routines moved to gen_bitmap.c */ 358extern int ext2fs_mark_generic_bitmap(ext2fs_generic_bitmap bitmap, 359 __u32 bitno); 360extern int ext2fs_unmark_generic_bitmap(ext2fs_generic_bitmap bitmap, 361 blk_t bitno); 362_INLINE_ int ext2fs_test_generic_bitmap(ext2fs_generic_bitmap bitmap, 363 blk_t bitno); 364 365_INLINE_ int ext2fs_test_generic_bitmap(ext2fs_generic_bitmap bitmap, 366 blk_t bitno) 367{ 368 if ((bitno < bitmap->start) || (bitno > bitmap->end)) { 369 ext2fs_warn_bitmap2(bitmap, EXT2FS_TEST_ERROR, bitno); 370 return 0; 371 } 372 return ext2fs_test_bit(bitno - bitmap->start, bitmap->bitmap); 373} 374 375_INLINE_ int ext2fs_mark_block_bitmap(ext2fs_block_bitmap bitmap, 376 blk_t block) 377{ 378 return ext2fs_mark_generic_bitmap((ext2fs_generic_bitmap) 379 bitmap, 380 block); 381} 382 383_INLINE_ int ext2fs_unmark_block_bitmap(ext2fs_block_bitmap bitmap, 384 blk_t block) 385{ 386 return ext2fs_unmark_generic_bitmap((ext2fs_generic_bitmap) bitmap, 387 block); 388} 389 390_INLINE_ int ext2fs_test_block_bitmap(ext2fs_block_bitmap bitmap, 391 blk_t block) 392{ 393 return ext2fs_test_generic_bitmap((ext2fs_generic_bitmap) bitmap, 394 block); 395} 396 397_INLINE_ int ext2fs_mark_inode_bitmap(ext2fs_inode_bitmap bitmap, 398 ext2_ino_t inode) 399{ 400 return ext2fs_mark_generic_bitmap((ext2fs_generic_bitmap) bitmap, 401 inode); 402} 403 404_INLINE_ int ext2fs_unmark_inode_bitmap(ext2fs_inode_bitmap bitmap, 405 ext2_ino_t inode) 406{ 407 return ext2fs_unmark_generic_bitmap((ext2fs_generic_bitmap) bitmap, 408 inode); 409} 410 411_INLINE_ int ext2fs_test_inode_bitmap(ext2fs_inode_bitmap bitmap, 412 ext2_ino_t inode) 413{ 414 return ext2fs_test_generic_bitmap((ext2fs_generic_bitmap) bitmap, 415 inode); 416} 417 418_INLINE_ void ext2fs_fast_mark_block_bitmap(ext2fs_block_bitmap bitmap, 419 blk_t block) 420{ 421#ifdef EXT2FS_DEBUG_FAST_OPS 422 if ((block < bitmap->start) || (block > bitmap->end)) { 423 ext2fs_warn_bitmap(EXT2_ET_BAD_BLOCK_MARK, block, 424 bitmap->description); 425 return; 426 } 427#endif 428 ext2fs_set_bit(block - bitmap->start, bitmap->bitmap); 429} 430 431_INLINE_ void ext2fs_fast_unmark_block_bitmap(ext2fs_block_bitmap bitmap, 432 blk_t block) 433{ 434#ifdef EXT2FS_DEBUG_FAST_OPS 435 if ((block < bitmap->start) || (block > bitmap->end)) { 436 ext2fs_warn_bitmap(EXT2_ET_BAD_BLOCK_UNMARK, 437 block, bitmap->description); 438 return; 439 } 440#endif 441 ext2fs_clear_bit(block - bitmap->start, bitmap->bitmap); 442} 443 444_INLINE_ int ext2fs_fast_test_block_bitmap(ext2fs_block_bitmap bitmap, 445 blk_t block) 446{ 447#ifdef EXT2FS_DEBUG_FAST_OPS 448 if ((block < bitmap->start) || (block > bitmap->end)) { 449 ext2fs_warn_bitmap(EXT2_ET_BAD_BLOCK_TEST, 450 block, bitmap->description); 451 return 0; 452 } 453#endif 454 return ext2fs_test_bit(block - bitmap->start, bitmap->bitmap); 455} 456 457_INLINE_ void ext2fs_fast_mark_inode_bitmap(ext2fs_inode_bitmap bitmap, 458 ext2_ino_t inode) 459{ 460#ifdef EXT2FS_DEBUG_FAST_OPS 461 if ((inode < bitmap->start) || (inode > bitmap->end)) { 462 ext2fs_warn_bitmap(EXT2_ET_BAD_INODE_MARK, 463 inode, bitmap->description); 464 return; 465 } 466#endif 467 ext2fs_set_bit(inode - bitmap->start, bitmap->bitmap); 468} 469 470_INLINE_ void ext2fs_fast_unmark_inode_bitmap(ext2fs_inode_bitmap bitmap, 471 ext2_ino_t inode) 472{ 473#ifdef EXT2FS_DEBUG_FAST_OPS 474 if ((inode < bitmap->start) || (inode > bitmap->end)) { 475 ext2fs_warn_bitmap(EXT2_ET_BAD_INODE_UNMARK, 476 inode, bitmap->description); 477 return; 478 } 479#endif 480 ext2fs_clear_bit(inode - bitmap->start, bitmap->bitmap); 481} 482 483_INLINE_ int ext2fs_fast_test_inode_bitmap(ext2fs_inode_bitmap bitmap, 484 ext2_ino_t inode) 485{ 486#ifdef EXT2FS_DEBUG_FAST_OPS 487 if ((inode < bitmap->start) || (inode > bitmap->end)) { 488 ext2fs_warn_bitmap(EXT2_ET_BAD_INODE_TEST, 489 inode, bitmap->description); 490 return 0; 491 } 492#endif 493 return ext2fs_test_bit(inode - bitmap->start, bitmap->bitmap); 494} 495 496_INLINE_ blk_t ext2fs_get_block_bitmap_start(ext2fs_block_bitmap bitmap) 497{ 498 return bitmap->start; 499} 500 501_INLINE_ ext2_ino_t ext2fs_get_inode_bitmap_start(ext2fs_inode_bitmap bitmap) 502{ 503 return bitmap->start; 504} 505 506_INLINE_ blk_t ext2fs_get_block_bitmap_end(ext2fs_block_bitmap bitmap) 507{ 508 return bitmap->end; 509} 510 511_INLINE_ ext2_ino_t ext2fs_get_inode_bitmap_end(ext2fs_inode_bitmap bitmap) 512{ 513 return bitmap->end; 514} 515 516_INLINE_ int ext2fs_test_block_bitmap_range(ext2fs_block_bitmap bitmap, 517 blk_t block, int num) 518{ 519 int i; 520 521 if ((block < bitmap->start) || (block+num-1 > bitmap->end)) { 522 ext2fs_warn_bitmap(EXT2_ET_BAD_BLOCK_TEST, 523 block, bitmap->description); 524 return 0; 525 } 526 for (i=0; i < num; i++) { 527 if (ext2fs_fast_test_block_bitmap(bitmap, block+i)) 528 return 0; 529 } 530 return 1; 531} 532 533_INLINE_ int ext2fs_fast_test_block_bitmap_range(ext2fs_block_bitmap bitmap, 534 blk_t block, int num) 535{ 536 int i; 537 538#ifdef EXT2FS_DEBUG_FAST_OPS 539 if ((block < bitmap->start) || (block+num-1 > bitmap->end)) { 540 ext2fs_warn_bitmap(EXT2_ET_BAD_BLOCK_TEST, 541 block, bitmap->description); 542 return 0; 543 } 544#endif 545 for (i=0; i < num; i++) { 546 if (ext2fs_fast_test_block_bitmap(bitmap, block+i)) 547 return 0; 548 } 549 return 1; 550} 551 552_INLINE_ void ext2fs_mark_block_bitmap_range(ext2fs_block_bitmap bitmap, 553 blk_t block, int num) 554{ 555 int i; 556 557 if ((block < bitmap->start) || (block+num-1 > bitmap->end)) { 558 ext2fs_warn_bitmap(EXT2_ET_BAD_BLOCK_MARK, block, 559 bitmap->description); 560 return; 561 } 562 for (i=0; i < num; i++) 563 ext2fs_set_bit(block + i - bitmap->start, bitmap->bitmap); 564} 565 566_INLINE_ void ext2fs_fast_mark_block_bitmap_range(ext2fs_block_bitmap bitmap, 567 blk_t block, int num) 568{ 569 int i; 570 571#ifdef EXT2FS_DEBUG_FAST_OPS 572 if ((block < bitmap->start) || (block+num-1 > bitmap->end)) { 573 ext2fs_warn_bitmap(EXT2_ET_BAD_BLOCK_MARK, block, 574 bitmap->description); 575 return; 576 } 577#endif 578 for (i=0; i < num; i++) 579 ext2fs_set_bit(block + i - bitmap->start, bitmap->bitmap); 580} 581 582_INLINE_ void ext2fs_unmark_block_bitmap_range(ext2fs_block_bitmap bitmap, 583 blk_t block, int num) 584{ 585 int i; 586 587 if ((block < bitmap->start) || (block+num-1 > bitmap->end)) { 588 ext2fs_warn_bitmap(EXT2_ET_BAD_BLOCK_UNMARK, block, 589 bitmap->description); 590 return; 591 } 592 for (i=0; i < num; i++) 593 ext2fs_clear_bit(block + i - bitmap->start, bitmap->bitmap); 594} 595 596_INLINE_ void ext2fs_fast_unmark_block_bitmap_range(ext2fs_block_bitmap bitmap, 597 blk_t block, int num) 598{ 599 int i; 600 601#ifdef EXT2FS_DEBUG_FAST_OPS 602 if ((block < bitmap->start) || (block+num-1 > bitmap->end)) { 603 ext2fs_warn_bitmap(EXT2_ET_BAD_BLOCK_UNMARK, block, 604 bitmap->description); 605 return; 606 } 607#endif 608 for (i=0; i < num; i++) 609 ext2fs_clear_bit(block + i - bitmap->start, bitmap->bitmap); 610} 611#undef _INLINE_ 612#endif 613 614