2 * bitops.h --- Bitmap frobbing code. The byte swapping routines are
5 * Copyright (C) 1993, 1994, 1995, 1996 Theodore Ts'o.
8 * This file may be redistributed under the terms of the GNU Public
12 * i386 bitops operations taken from <asm/bitops.h>, Copyright 1992,
17 extern int ext2fs_set_bit(int nr,void * addr);
18 extern int ext2fs_clear_bit(int nr, void * addr);
19 extern int ext2fs_test_bit(int nr, const void * addr);
20 extern __u16 ext2fs_swab16(__u16 val);
21 extern __u32 ext2fs_swab32(__u32 val);
24 * EXT2FS bitmap manipulation routines.
27 /* Support for sending warning messages from the inline subroutines */
28 extern const char *ext2fs_block_string;
29 extern const char *ext2fs_inode_string;
30 extern const char *ext2fs_mark_string;
31 extern const char *ext2fs_unmark_string;
32 extern const char *ext2fs_test_string;
33 extern void ext2fs_warn_bitmap(errcode_t errcode, unsigned long arg,
34 const char *description);
35 extern void ext2fs_warn_bitmap2(ext2fs_generic_bitmap bitmap,
36 int code, unsigned long arg);
38 extern void ext2fs_mark_block_bitmap(ext2fs_block_bitmap bitmap, blk_t block);
39 extern void ext2fs_unmark_block_bitmap(ext2fs_block_bitmap bitmap,
41 extern int ext2fs_test_block_bitmap(ext2fs_block_bitmap bitmap, blk_t block);
43 extern void ext2fs_mark_inode_bitmap(ext2fs_inode_bitmap bitmap, ino_t inode);
44 extern void ext2fs_unmark_inode_bitmap(ext2fs_inode_bitmap bitmap,
46 extern int ext2fs_test_inode_bitmap(ext2fs_inode_bitmap bitmap, ino_t inode);
48 extern void ext2fs_fast_mark_block_bitmap(ext2fs_block_bitmap bitmap,
50 extern void ext2fs_fast_unmark_block_bitmap(ext2fs_block_bitmap bitmap,
52 extern int ext2fs_fast_test_block_bitmap(ext2fs_block_bitmap bitmap,
55 extern void ext2fs_fast_mark_inode_bitmap(ext2fs_inode_bitmap bitmap,
57 extern void ext2fs_fast_unmark_inode_bitmap(ext2fs_inode_bitmap bitmap,
59 extern int ext2fs_fast_test_inode_bitmap(ext2fs_inode_bitmap bitmap,
61 extern blk_t ext2fs_get_block_bitmap_start(ext2fs_block_bitmap bitmap);
62 extern ino_t ext2fs_get_inode_bitmap_start(ext2fs_inode_bitmap bitmap);
63 extern blk_t ext2fs_get_block_bitmap_end(ext2fs_block_bitmap bitmap);
64 extern ino_t ext2fs_get_inode_bitmap_end(ext2fs_inode_bitmap bitmap);
66 extern void ext2fs_mark_block_bitmap_range(ext2fs_block_bitmap bitmap,
67 blk_t block, int num);
68 extern void ext2fs_unmark_block_bitmap_range(ext2fs_block_bitmap bitmap,
69 blk_t block, int num);
70 extern int ext2fs_test_block_bitmap_range(ext2fs_block_bitmap bitmap,
71 blk_t block, int num);
72 extern void ext2fs_fast_mark_block_bitmap_range(ext2fs_block_bitmap bitmap,
73 blk_t block, int num);
74 extern void ext2fs_fast_unmark_block_bitmap_range(ext2fs_block_bitmap bitmap,
75 blk_t block, int num);
76 extern int ext2fs_fast_test_block_bitmap_range(ext2fs_block_bitmap bitmap,
77 blk_t block, int num);
80 * The inline routines themselves...
82 * If NO_INLINE_FUNCS is defined, then we won't try to do inline
83 * functions at all; they will be included as normal functions in
86 #ifdef NO_INLINE_FUNCS
87 #if (defined(__i386__) || defined(__i486__) || defined(__i586__) || \
88 defined(__mc68000__) || defined(__sparc__))
89 /* This prevents bitops.c from trying to include the C */
90 /* function version of these functions */
91 #define _EXT2_HAVE_ASM_BITOPS_
93 #endif /* NO_INLINE_FUNCS */
95 #if (defined(INCLUDE_INLINE_FUNCS) || !defined(NO_INLINE_FUNCS))
96 #ifdef INCLUDE_INLINE_FUNCS
97 #define _INLINE_ extern
99 #define _INLINE_ extern __inline__
102 #if (defined(__i386__) || defined(__i486__) || defined(__i586__))
104 #define _EXT2_HAVE_ASM_BITOPS_
107 * These are done by inline assembly for speed reasons.....
109 * All bitoperations return 0 if the bit was cleared before the
110 * operation and != 0 if it was not. Bit 0 is the LSB of addr; bit 32
111 * is the LSB of (addr+1).
115 * Some hacks to defeat gcc over-optimizations..
117 struct __dummy_h { unsigned long a[100]; };
118 #define EXT2FS_ADDR (*(struct __dummy_h *) addr)
119 #define EXT2FS_CONST_ADDR (*(const struct __dummy_h *) addr)
121 _INLINE_ int ext2fs_set_bit(int nr, void * addr)
125 __asm__ __volatile__("btsl %2,%1\n\tsbbl %0,%0"
126 :"=r" (oldbit),"=m" (EXT2FS_ADDR)
131 _INLINE_ int ext2fs_clear_bit(int nr, void * addr)
135 __asm__ __volatile__("btrl %2,%1\n\tsbbl %0,%0"
136 :"=r" (oldbit),"=m" (EXT2FS_ADDR)
141 _INLINE_ int ext2fs_test_bit(int nr, const void * addr)
145 __asm__ __volatile__("btl %2,%1\n\tsbbl %0,%0"
147 :"m" (EXT2FS_CONST_ADDR),"r" (nr));
157 #define _EXT2_HAVE_ASM_BITOPS_
159 _INLINE_ int ext2fs_set_bit(int nr,void * addr)
163 __asm__ __volatile__ ("bfset %2@{%1:#1}; sne %0"
164 : "=d" (retval) : "d" (nr^7), "a" (addr));
169 _INLINE_ int ext2fs_clear_bit(int nr, void * addr)
173 __asm__ __volatile__ ("bfclr %2@{%1:#1}; sne %0"
174 : "=d" (retval) : "d" (nr^7), "a" (addr));
179 _INLINE_ int ext2fs_test_bit(int nr, const void * addr)
183 __asm__ __volatile__ ("bftst %2@{%1:#1}; sne %0"
184 : "=d" (retval) : "d" (nr^7), "a" (addr));
189 #endif /* __mc68000__ */
193 #define _EXT2_HAVE_ASM_BITOPS_
195 #ifndef EXT2_OLD_BITOPS
198 * Do the bitops so that we are compatible with the standard i386
202 _INLINE_ int ext2fs_set_bit(int nr,void * addr)
206 unsigned char *ADDR = (unsigned char *) addr;
209 mask = 1 << (nr & 0x07);
210 __asm__ __volatile__("ldub [%0], %%g6\n\t"
211 "or %%g6, %2, %%g5\n\t"
215 : "0" (ADDR), "r" (mask)
220 unsigned char *ADDR = (unsigned char *) addr;
223 mask = 1 << (nr & 0x07);
224 retval = (mask & *ADDR) != 0;
230 _INLINE_ int ext2fs_clear_bit(int nr, void * addr)
234 unsigned char *ADDR = (unsigned char *) addr;
237 mask = 1 << (nr & 0x07);
238 __asm__ __volatile__("ldub [%0], %%g6\n\t"
239 "andn %%g6, %2, %%g5\n\t"
243 : "0" (ADDR), "r" (mask)
249 unsigned char *ADDR = (unsigned char *) addr;
252 mask = 1 << (nr & 0x07);
253 retval = (mask & *ADDR) != 0;
259 _INLINE_ int ext2fs_test_bit(int nr, const void * addr)
262 const unsigned char *ADDR = (const unsigned char *) addr;
265 mask = 1 << (nr & 0x07);
266 return ((mask & *ADDR) != 0);
271 /* Do things the old, unplesant way. */
273 _INLINE_ int ext2fs_set_bit(int nr, void *addr)
276 unsigned long *ADDR = (unsigned long *) addr;
279 mask = 1 << (nr & 31);
280 retval = ((mask & *ADDR) != 0);
285 _INLINE_ int ext2fs_clear_bit(int nr, void *addr)
288 unsigned long *ADDR = (unsigned long *) addr;
291 mask = 1 << (nr & 31);
292 retval = ((mask & *ADDR) != 0);
297 _INLINE_ int ext2fs_test_bit(int nr, const void *addr)
300 const unsigned long *ADDR = (const unsigned long *) addr;
303 mask = 1 << (nr & 31);
304 return ((mask & *ADDR) != 0);
308 #endif /* __sparc__ */
310 #ifndef _EXT2_HAVE_ASM_SWAB
312 _INLINE_ __u16 ext2fs_swab16(__u16 val)
314 return (val >> 8) | (val << 8);
317 _INLINE_ __u32 ext2fs_swab32(__u32 val)
319 return ((val>>24) | ((val>>8)&0xFF00) |
320 ((val<<8)&0xFF0000) | (val<<24));
323 #endif /* !_EXT2_HAVE_ASM_SWAB */
325 _INLINE_ void ext2fs_mark_generic_bitmap(ext2fs_generic_bitmap bitmap,
327 _INLINE_ void ext2fs_unmark_generic_bitmap(ext2fs_generic_bitmap bitmap,
329 _INLINE_ int ext2fs_test_generic_bitmap(ext2fs_generic_bitmap bitmap,
332 _INLINE_ void ext2fs_mark_generic_bitmap(ext2fs_generic_bitmap bitmap,
335 if ((bitno < bitmap->start) || (bitno > bitmap->end)) {
336 ext2fs_warn_bitmap2(bitmap, EXT2FS_MARK_ERROR, bitno);
339 ext2fs_set_bit(bitno - bitmap->start, bitmap->bitmap);
342 _INLINE_ void ext2fs_unmark_generic_bitmap(ext2fs_generic_bitmap bitmap,
345 if ((bitno < bitmap->start) || (bitno > bitmap->end)) {
346 ext2fs_warn_bitmap2(bitmap, EXT2FS_UNMARK_ERROR, bitno);
349 ext2fs_clear_bit(bitno - bitmap->start, bitmap->bitmap);
352 _INLINE_ int ext2fs_test_generic_bitmap(ext2fs_generic_bitmap bitmap,
355 if ((bitno < bitmap->start) || (bitno > bitmap->end)) {
356 ext2fs_warn_bitmap2(bitmap, EXT2FS_TEST_ERROR, bitno);
359 return ext2fs_test_bit(bitno - bitmap->start, bitmap->bitmap);
362 _INLINE_ void ext2fs_mark_block_bitmap(ext2fs_block_bitmap bitmap,
365 ext2fs_mark_generic_bitmap((ext2fs_generic_bitmap) bitmap, block);
368 _INLINE_ void ext2fs_unmark_block_bitmap(ext2fs_block_bitmap bitmap,
371 ext2fs_unmark_generic_bitmap((ext2fs_generic_bitmap) bitmap, block);
374 _INLINE_ int ext2fs_test_block_bitmap(ext2fs_block_bitmap bitmap,
377 return ext2fs_test_generic_bitmap((ext2fs_generic_bitmap) bitmap,
381 _INLINE_ void ext2fs_mark_inode_bitmap(ext2fs_inode_bitmap bitmap,
384 ext2fs_mark_generic_bitmap((ext2fs_generic_bitmap) bitmap, inode);
387 _INLINE_ void ext2fs_unmark_inode_bitmap(ext2fs_inode_bitmap bitmap,
390 ext2fs_unmark_generic_bitmap((ext2fs_generic_bitmap) bitmap, inode);
393 _INLINE_ int ext2fs_test_inode_bitmap(ext2fs_inode_bitmap bitmap,
396 return ext2fs_test_generic_bitmap((ext2fs_generic_bitmap) bitmap,
400 _INLINE_ void ext2fs_fast_mark_block_bitmap(ext2fs_block_bitmap bitmap,
403 #ifdef EXT2FS_DEBUG_FAST_OPS
404 if ((block < bitmap->start) || (block > bitmap->end)) {
405 ext2fs_warn_bitmap(EXT2_ET_BAD_BLOCK_MARK, block,
406 bitmap->description);
410 ext2fs_set_bit(block - bitmap->start, bitmap->bitmap);
413 _INLINE_ void ext2fs_fast_unmark_block_bitmap(ext2fs_block_bitmap bitmap,
416 #ifdef EXT2FS_DEBUG_FAST_OPS
417 if ((block < bitmap->start) || (block > bitmap->end)) {
418 ext2fs_warn_bitmap(EXT2_ET_BAD_BLOCK_UNMARK,
419 block, bitmap->description);
423 ext2fs_clear_bit(block - bitmap->start, bitmap->bitmap);
426 _INLINE_ int ext2fs_fast_test_block_bitmap(ext2fs_block_bitmap bitmap,
429 #ifdef EXT2FS_DEBUG_FAST_OPS
430 if ((block < bitmap->start) || (block > bitmap->end)) {
431 ext2fs_warn_bitmap(EXT2_ET_BAD_BLOCK_TEST,
432 block, bitmap->description);
436 return ext2fs_test_bit(block - bitmap->start, bitmap->bitmap);
439 _INLINE_ void ext2fs_fast_mark_inode_bitmap(ext2fs_inode_bitmap bitmap,
442 #ifdef EXT2FS_DEBUG_FAST_OPS
443 if ((inode < bitmap->start) || (inode > bitmap->end)) {
444 ext2fs_warn_bitmap(EXT2_ET_BAD_INODE_MARK,
445 inode, bitmap->description);
449 ext2fs_set_bit(inode - bitmap->start, bitmap->bitmap);
452 _INLINE_ void ext2fs_fast_unmark_inode_bitmap(ext2fs_inode_bitmap bitmap,
455 #ifdef EXT2FS_DEBUG_FAST_OPS
456 if ((inode < bitmap->start) || (inode > bitmap->end)) {
457 ext2fs_warn_bitmap(EXT2_ET_BAD_INODE_UNMARK,
458 inode, bitmap->description);
462 ext2fs_clear_bit(inode - bitmap->start, bitmap->bitmap);
465 _INLINE_ int ext2fs_fast_test_inode_bitmap(ext2fs_inode_bitmap bitmap,
468 #ifdef EXT2FS_DEBUG_FAST_OPS
469 if ((inode < bitmap->start) || (inode > bitmap->end)) {
470 ext2fs_warn_bitmap(EXT2_ET_BAD_INODE_TEST,
471 inode, bitmap->description);
475 return ext2fs_test_bit(inode - bitmap->start, bitmap->bitmap);
478 _INLINE_ blk_t ext2fs_get_block_bitmap_start(ext2fs_block_bitmap bitmap)
480 return bitmap->start;
483 _INLINE_ ino_t ext2fs_get_inode_bitmap_start(ext2fs_inode_bitmap bitmap)
485 return bitmap->start;
488 _INLINE_ blk_t ext2fs_get_block_bitmap_end(ext2fs_block_bitmap bitmap)
493 _INLINE_ ino_t ext2fs_get_inode_bitmap_end(ext2fs_inode_bitmap bitmap)
498 _INLINE_ int ext2fs_test_block_bitmap_range(ext2fs_block_bitmap bitmap,
499 blk_t block, int num)
503 if ((block < bitmap->start) || (block+num-1 > bitmap->end)) {
504 ext2fs_warn_bitmap(EXT2_ET_BAD_BLOCK_TEST,
505 block, bitmap->description);
508 for (i=0; i < num; i++) {
509 if (ext2fs_fast_test_block_bitmap(bitmap, block+i))
515 _INLINE_ int ext2fs_fast_test_block_bitmap_range(ext2fs_block_bitmap bitmap,
516 blk_t block, int num)
520 #ifdef EXT2FS_DEBUG_FAST_OPS
521 if ((block < bitmap->start) || (block+num-1 > bitmap->end)) {
522 ext2fs_warn_bitmap(EXT2_ET_BAD_BLOCK_TEST,
523 block, bitmap->description);
527 for (i=0; i < num; i++) {
528 if (ext2fs_fast_test_block_bitmap(bitmap, block+i))
534 _INLINE_ void ext2fs_mark_block_bitmap_range(ext2fs_block_bitmap bitmap,
535 blk_t block, int num)
539 if ((block < bitmap->start) || (block+num-1 > bitmap->end)) {
540 ext2fs_warn_bitmap(EXT2_ET_BAD_BLOCK_MARK, block,
541 bitmap->description);
544 for (i=0; i < num; i++)
545 ext2fs_set_bit(block + i - bitmap->start, bitmap->bitmap);
548 _INLINE_ void ext2fs_fast_mark_block_bitmap_range(ext2fs_block_bitmap bitmap,
549 blk_t block, int num)
553 #ifdef EXT2FS_DEBUG_FAST_OPS
554 if ((block < bitmap->start) || (block+num-1 > bitmap->end)) {
555 ext2fs_warn_bitmap(EXT2_ET_BAD_BLOCK_MARK, block,
556 bitmap->description);
560 for (i=0; i < num; i++)
561 ext2fs_set_bit(block + i - bitmap->start, bitmap->bitmap);
564 _INLINE_ void ext2fs_unmark_block_bitmap_range(ext2fs_block_bitmap bitmap,
565 blk_t block, int num)
569 if ((block < bitmap->start) || (block+num-1 > bitmap->end)) {
570 ext2fs_warn_bitmap(EXT2_ET_BAD_BLOCK_UNMARK, block,
571 bitmap->description);
574 for (i=0; i < num; i++)
575 ext2fs_clear_bit(block + i - bitmap->start, bitmap->bitmap);
578 _INLINE_ void ext2fs_fast_unmark_block_bitmap_range(ext2fs_block_bitmap bitmap,
579 blk_t block, int num)
583 #ifdef EXT2FS_DEBUG_FAST_OPS
584 if ((block < bitmap->start) || (block+num-1 > bitmap->end)) {
585 ext2fs_warn_bitmap(EXT2_ET_BAD_BLOCK_UNMARK, block,
586 bitmap->description);
590 for (i=0; i < num; i++)
591 ext2fs_clear_bit(block + i - bitmap->start, bitmap->bitmap);