618 lines
16 KiB
C
618 lines
16 KiB
C
/*
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* bitops.h --- Bitmap frobbing code. The byte swapping routines are
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* also included here.
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*
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* Copyright (C) 1993, 1994, 1995, 1996 Theodore Ts'o.
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*
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* %Begin-Header%
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* This file may be redistributed under the terms of the GNU Public
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* License.
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* %End-Header%
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*
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* i386 bitops operations taken from <asm/bitops.h>, Copyright 1992,
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* Linus Torvalds.
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*/
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extern int ext2fs_set_bit(int nr,void * addr);
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extern int ext2fs_clear_bit(int nr, void * addr);
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extern int ext2fs_test_bit(int nr, const void * addr);
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extern __u16 ext2fs_swab16(__u16 val);
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extern __u32 ext2fs_swab32(__u32 val);
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#ifdef WORDS_BIGENDIAN
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#define ext2fs_cpu_to_le32(x) ext2fs_swab32((x))
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#define ext2fs_le32_to_cpu(x) ext2fs_swab32((x))
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#define ext2fs_cpu_to_le16(x) ext2fs_swab16((x))
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#define ext2fs_le16_to_cpu(x) ext2fs_swab16((x))
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#define ext2fs_cpu_to_be32(x) ((__u32)(x))
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#define ext2fs_be32_to_cpu(x) ((__u32)(x))
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#define ext2fs_cpu_to_be16(x) ((__u16)(x))
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#define ext2fs_be16_to_cpu(x) ((__u16)(x))
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#else
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#define ext2fs_cpu_to_le32(x) ((__u32)(x))
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#define ext2fs_le32_to_cpu(x) ((__u32)(x))
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#define ext2fs_cpu_to_le16(x) ((__u16)(x))
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#define ext2fs_le16_to_cpu(x) ((__u16)(x))
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#define ext2fs_cpu_to_be32(x) ext2fs_swab32((x))
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#define ext2fs_be32_to_cpu(x) ext2fs_swab32((x))
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#define ext2fs_cpu_to_be16(x) ext2fs_swab16((x))
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#define ext2fs_be16_to_cpu(x) ext2fs_swab16((x))
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#endif
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/*
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* EXT2FS bitmap manipulation routines.
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*/
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/* Support for sending warning messages from the inline subroutines */
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extern const char *ext2fs_block_string;
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extern const char *ext2fs_inode_string;
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extern const char *ext2fs_mark_string;
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extern const char *ext2fs_unmark_string;
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extern const char *ext2fs_test_string;
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extern void ext2fs_warn_bitmap(errcode_t errcode, unsigned long arg,
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const char *description);
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extern void ext2fs_warn_bitmap2(ext2fs_generic_bitmap bitmap,
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int code, unsigned long arg);
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extern int ext2fs_mark_block_bitmap(ext2fs_block_bitmap bitmap, blk_t block);
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extern int ext2fs_unmark_block_bitmap(ext2fs_block_bitmap bitmap,
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blk_t block);
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extern int ext2fs_test_block_bitmap(ext2fs_block_bitmap bitmap, blk_t block);
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extern int ext2fs_mark_inode_bitmap(ext2fs_inode_bitmap bitmap, ext2_ino_t inode);
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extern int ext2fs_unmark_inode_bitmap(ext2fs_inode_bitmap bitmap,
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ext2_ino_t inode);
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extern int ext2fs_test_inode_bitmap(ext2fs_inode_bitmap bitmap, ext2_ino_t inode);
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extern void ext2fs_fast_mark_block_bitmap(ext2fs_block_bitmap bitmap,
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blk_t block);
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extern void ext2fs_fast_unmark_block_bitmap(ext2fs_block_bitmap bitmap,
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blk_t block);
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extern int ext2fs_fast_test_block_bitmap(ext2fs_block_bitmap bitmap,
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blk_t block);
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extern void ext2fs_fast_mark_inode_bitmap(ext2fs_inode_bitmap bitmap,
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ext2_ino_t inode);
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extern void ext2fs_fast_unmark_inode_bitmap(ext2fs_inode_bitmap bitmap,
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ext2_ino_t inode);
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extern int ext2fs_fast_test_inode_bitmap(ext2fs_inode_bitmap bitmap,
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ext2_ino_t inode);
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extern blk_t ext2fs_get_block_bitmap_start(ext2fs_block_bitmap bitmap);
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extern ext2_ino_t ext2fs_get_inode_bitmap_start(ext2fs_inode_bitmap bitmap);
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extern blk_t ext2fs_get_block_bitmap_end(ext2fs_block_bitmap bitmap);
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extern ext2_ino_t ext2fs_get_inode_bitmap_end(ext2fs_inode_bitmap bitmap);
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extern void ext2fs_mark_block_bitmap_range(ext2fs_block_bitmap bitmap,
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blk_t block, int num);
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extern void ext2fs_unmark_block_bitmap_range(ext2fs_block_bitmap bitmap,
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blk_t block, int num);
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extern int ext2fs_test_block_bitmap_range(ext2fs_block_bitmap bitmap,
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blk_t block, int num);
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extern void ext2fs_fast_mark_block_bitmap_range(ext2fs_block_bitmap bitmap,
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blk_t block, int num);
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extern void ext2fs_fast_unmark_block_bitmap_range(ext2fs_block_bitmap bitmap,
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blk_t block, int num);
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extern int ext2fs_fast_test_block_bitmap_range(ext2fs_block_bitmap bitmap,
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blk_t block, int num);
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extern void ext2fs_set_bitmap_padding(ext2fs_generic_bitmap map);
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/* These two routines moved to gen_bitmap.c */
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extern int ext2fs_mark_generic_bitmap(ext2fs_generic_bitmap bitmap,
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__u32 bitno);
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extern int ext2fs_unmark_generic_bitmap(ext2fs_generic_bitmap bitmap,
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blk_t bitno);
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/*
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* The inline routines themselves...
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*
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* If NO_INLINE_FUNCS is defined, then we won't try to do inline
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* functions at all; they will be included as normal functions in
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* inline.c
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*/
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#ifdef NO_INLINE_FUNCS
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#if (defined(__GNUC__) && (defined(__i386__) || defined(__i486__) || \
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defined(__i586__) || defined(__mc68000__) || \
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defined(__sparc__)))
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/* This prevents bitops.c from trying to include the C */
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/* function version of these functions */
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#define _EXT2_HAVE_ASM_BITOPS_
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#endif
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#endif /* NO_INLINE_FUNCS */
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#if (defined(INCLUDE_INLINE_FUNCS) || !defined(NO_INLINE_FUNCS))
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#ifdef INCLUDE_INLINE_FUNCS
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#define _INLINE_ extern
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#else
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#ifdef __GNUC__
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#define _INLINE_ extern __inline__
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#else /* For Watcom C */
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#define _INLINE_ extern inline
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#endif
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#endif
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#if ((defined __GNUC__) && !defined(_EXT2_USE_C_VERSIONS_) && \
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(defined(__i386__) || defined(__i486__) || defined(__i586__)))
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#define _EXT2_HAVE_ASM_BITOPS_
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#define _EXT2_HAVE_ASM_SWAB_
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#define _EXT2_HAVE_ASM_FINDBIT_
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/*
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* These are done by inline assembly for speed reasons.....
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*
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* All bitoperations return 0 if the bit was cleared before the
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* operation and != 0 if it was not. Bit 0 is the LSB of addr; bit 32
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* is the LSB of (addr+1).
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*/
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/*
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* Some hacks to defeat gcc over-optimizations..
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*/
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struct __dummy_h { unsigned long a[100]; };
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#define EXT2FS_ADDR (*(struct __dummy_h *) addr)
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#define EXT2FS_CONST_ADDR (*(const struct __dummy_h *) addr)
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_INLINE_ int ext2fs_set_bit(int nr, void * addr)
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{
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int oldbit;
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__asm__ __volatile__("btsl %2,%1\n\tsbbl %0,%0"
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:"=r" (oldbit),"=m" (EXT2FS_ADDR)
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:"r" (nr));
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return oldbit;
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}
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_INLINE_ int ext2fs_clear_bit(int nr, void * addr)
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{
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int oldbit;
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__asm__ __volatile__("btrl %2,%1\n\tsbbl %0,%0"
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:"=r" (oldbit),"=m" (EXT2FS_ADDR)
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:"r" (nr));
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return oldbit;
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}
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_INLINE_ int ext2fs_test_bit(int nr, const void * addr)
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{
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int oldbit;
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__asm__ __volatile__("btl %2,%1\n\tsbbl %0,%0"
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:"=r" (oldbit)
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:"m" (EXT2FS_CONST_ADDR),"r" (nr));
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return oldbit;
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}
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#if 0
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_INLINE_ int ext2fs_find_first_bit_set(void * addr, unsigned size)
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{
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int d0, d1, d2;
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int res;
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if (!size)
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return 0;
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/* This looks at memory. Mark it volatile to tell gcc not to move it around */
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__asm__ __volatile__(
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"cld\n\t"
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"xorl %%eax,%%eax\n\t"
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"xorl %%edx,%%edx\n\t"
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"repe; scasl\n\t"
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"je 1f\n\t"
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"movl -4(%%edi),%%eax\n\t"
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"subl $4,%%edi\n\t"
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"bsfl %%eax,%%edx\n"
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"1:\tsubl %%esi,%%edi\n\t"
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"shll $3,%%edi\n\t"
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"addl %%edi,%%edx"
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:"=d" (res), "=&c" (d0), "=&D" (d1), "=&a" (d2)
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:"1" ((size + 31) >> 5), "2" (addr), "S" (addr));
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return res;
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}
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_INLINE_ int ext2fs_find_next_bit_set (void * addr, int size, int offset)
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{
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unsigned long * p = ((unsigned long *) addr) + (offset >> 5);
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int set = 0, bit = offset & 31, res;
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if (bit) {
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/*
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* Look for zero in first byte
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*/
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__asm__("bsfl %1,%0\n\t"
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"jne 1f\n\t"
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"movl $32, %0\n"
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"1:"
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: "=r" (set)
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: "r" (*p >> bit));
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if (set < (32 - bit))
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return set + offset;
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set = 32 - bit;
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p++;
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}
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/*
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* No bit found yet, search remaining full bytes for a bit
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*/
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res = ext2fs_find_first_bit_set(p, size - 32 * (p - (unsigned long *) addr));
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return (offset + set + res);
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}
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#endif
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#ifdef EXT2FS_ENABLE_SWAPFS
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_INLINE_ __u32 ext2fs_swab32(__u32 val)
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{
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#ifdef EXT2FS_REQUIRE_486
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__asm__("bswap %0" : "=r" (val) : "0" (val));
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#else
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__asm__("xchgb %b0,%h0\n\t" /* swap lower bytes */
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"rorl $16,%0\n\t" /* swap words */
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"xchgb %b0,%h0" /* swap higher bytes */
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:"=q" (val)
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: "0" (val));
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#endif
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return val;
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}
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_INLINE_ __u16 ext2fs_swab16(__u16 val)
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{
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__asm__("xchgb %b0,%h0" /* swap bytes */ \
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: "=q" (val) \
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: "0" (val)); \
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return val;
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}
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#endif
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#undef EXT2FS_ADDR
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#endif /* i386 */
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#ifdef __mc68000__
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#define _EXT2_HAVE_ASM_BITOPS_
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_INLINE_ int ext2fs_set_bit(int nr,void * addr)
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{
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char retval;
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__asm__ __volatile__ ("bfset %2@{%1:#1}; sne %0"
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: "=d" (retval) : "d" (nr^7), "a" (addr));
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return retval;
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}
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_INLINE_ int ext2fs_clear_bit(int nr, void * addr)
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{
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char retval;
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__asm__ __volatile__ ("bfclr %2@{%1:#1}; sne %0"
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: "=d" (retval) : "d" (nr^7), "a" (addr));
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return retval;
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}
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_INLINE_ int ext2fs_test_bit(int nr, const void * addr)
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{
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char retval;
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__asm__ __volatile__ ("bftst %2@{%1:#1}; sne %0"
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: "=d" (retval) : "d" (nr^7), "a" (addr));
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return retval;
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}
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#endif /* __mc68000__ */
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#if !defined(_EXT2_HAVE_ASM_SWAB_) && defined(EXT2FS_ENABLE_SWAPFS)
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_INLINE_ __u16 ext2fs_swab16(__u16 val)
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{
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return (val >> 8) | (val << 8);
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}
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_INLINE_ __u32 ext2fs_swab32(__u32 val)
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{
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return ((val>>24) | ((val>>8)&0xFF00) |
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((val<<8)&0xFF0000) | (val<<24));
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}
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#endif /* !_EXT2_HAVE_ASM_SWAB */
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#if !defined(_EXT2_HAVE_ASM_FINDBIT_)
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_INLINE_ int ext2fs_find_first_bit_set(void * addr, unsigned size)
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{
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char *cp = (unsigned char *) addr;
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int res = 0, d0;
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if (!size)
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return 0;
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while ((size > res) && (*cp == 0)) {
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cp++;
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res += 8;
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}
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d0 = ffs(*cp);
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if (d0 == 0)
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return size;
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return res + d0 - 1;
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}
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_INLINE_ int ext2fs_find_next_bit_set (void * addr, int size, int offset)
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{
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unsigned char * p;
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int set = 0, bit = offset & 7, res = 0, d0;
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res = offset >> 3;
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p = ((unsigned char *) addr) + res;
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if (bit) {
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set = ffs(*p & ~((1 << bit) - 1));
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if (set)
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return (offset & ~7) + set - 1;
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p++;
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res += 8;
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}
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while ((size > res) && (*p == 0)) {
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p++;
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res += 8;
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}
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d0 = ffs(*p);
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if (d0 == 0)
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return size;
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return (res + d0 - 1);
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}
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#endif
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_INLINE_ int ext2fs_test_generic_bitmap(ext2fs_generic_bitmap bitmap,
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blk_t bitno);
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_INLINE_ int ext2fs_test_generic_bitmap(ext2fs_generic_bitmap bitmap,
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blk_t bitno)
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{
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if ((bitno < bitmap->start) || (bitno > bitmap->end)) {
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ext2fs_warn_bitmap2(bitmap, EXT2FS_TEST_ERROR, bitno);
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return 0;
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}
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return ext2fs_test_bit(bitno - bitmap->start, bitmap->bitmap);
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}
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_INLINE_ int ext2fs_mark_block_bitmap(ext2fs_block_bitmap bitmap,
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blk_t block)
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{
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return ext2fs_mark_generic_bitmap((ext2fs_generic_bitmap)
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bitmap,
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block);
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}
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_INLINE_ int ext2fs_unmark_block_bitmap(ext2fs_block_bitmap bitmap,
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blk_t block)
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{
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return ext2fs_unmark_generic_bitmap((ext2fs_generic_bitmap) bitmap,
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block);
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}
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_INLINE_ int ext2fs_test_block_bitmap(ext2fs_block_bitmap bitmap,
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blk_t block)
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{
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return ext2fs_test_generic_bitmap((ext2fs_generic_bitmap) bitmap,
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block);
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}
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_INLINE_ int ext2fs_mark_inode_bitmap(ext2fs_inode_bitmap bitmap,
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ext2_ino_t inode)
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{
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return ext2fs_mark_generic_bitmap((ext2fs_generic_bitmap) bitmap,
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inode);
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}
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_INLINE_ int ext2fs_unmark_inode_bitmap(ext2fs_inode_bitmap bitmap,
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ext2_ino_t inode)
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{
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return ext2fs_unmark_generic_bitmap((ext2fs_generic_bitmap) bitmap,
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inode);
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}
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_INLINE_ int ext2fs_test_inode_bitmap(ext2fs_inode_bitmap bitmap,
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ext2_ino_t inode)
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{
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return ext2fs_test_generic_bitmap((ext2fs_generic_bitmap) bitmap,
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inode);
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}
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_INLINE_ void ext2fs_fast_mark_block_bitmap(ext2fs_block_bitmap bitmap,
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blk_t block)
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{
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#ifdef EXT2FS_DEBUG_FAST_OPS
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if ((block < bitmap->start) || (block > bitmap->end)) {
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ext2fs_warn_bitmap(EXT2_ET_BAD_BLOCK_MARK, block,
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bitmap->description);
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return;
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}
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#endif
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ext2fs_set_bit(block - bitmap->start, bitmap->bitmap);
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}
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_INLINE_ void ext2fs_fast_unmark_block_bitmap(ext2fs_block_bitmap bitmap,
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blk_t block)
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{
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#ifdef EXT2FS_DEBUG_FAST_OPS
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if ((block < bitmap->start) || (block > bitmap->end)) {
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ext2fs_warn_bitmap(EXT2_ET_BAD_BLOCK_UNMARK,
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block, bitmap->description);
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return;
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}
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#endif
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ext2fs_clear_bit(block - bitmap->start, bitmap->bitmap);
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}
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_INLINE_ int ext2fs_fast_test_block_bitmap(ext2fs_block_bitmap bitmap,
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blk_t block)
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{
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#ifdef EXT2FS_DEBUG_FAST_OPS
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if ((block < bitmap->start) || (block > bitmap->end)) {
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ext2fs_warn_bitmap(EXT2_ET_BAD_BLOCK_TEST,
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block, bitmap->description);
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return 0;
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}
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#endif
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return ext2fs_test_bit(block - bitmap->start, bitmap->bitmap);
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}
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_INLINE_ void ext2fs_fast_mark_inode_bitmap(ext2fs_inode_bitmap bitmap,
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ext2_ino_t inode)
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{
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#ifdef EXT2FS_DEBUG_FAST_OPS
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if ((inode < bitmap->start) || (inode > bitmap->end)) {
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ext2fs_warn_bitmap(EXT2_ET_BAD_INODE_MARK,
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inode, bitmap->description);
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return;
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}
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#endif
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ext2fs_set_bit(inode - bitmap->start, bitmap->bitmap);
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}
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_INLINE_ void ext2fs_fast_unmark_inode_bitmap(ext2fs_inode_bitmap bitmap,
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ext2_ino_t inode)
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{
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|
#ifdef EXT2FS_DEBUG_FAST_OPS
|
|
if ((inode < bitmap->start) || (inode > bitmap->end)) {
|
|
ext2fs_warn_bitmap(EXT2_ET_BAD_INODE_UNMARK,
|
|
inode, bitmap->description);
|
|
return;
|
|
}
|
|
#endif
|
|
ext2fs_clear_bit(inode - bitmap->start, bitmap->bitmap);
|
|
}
|
|
|
|
_INLINE_ int ext2fs_fast_test_inode_bitmap(ext2fs_inode_bitmap bitmap,
|
|
ext2_ino_t inode)
|
|
{
|
|
#ifdef EXT2FS_DEBUG_FAST_OPS
|
|
if ((inode < bitmap->start) || (inode > bitmap->end)) {
|
|
ext2fs_warn_bitmap(EXT2_ET_BAD_INODE_TEST,
|
|
inode, bitmap->description);
|
|
return 0;
|
|
}
|
|
#endif
|
|
return ext2fs_test_bit(inode - bitmap->start, bitmap->bitmap);
|
|
}
|
|
|
|
_INLINE_ blk_t ext2fs_get_block_bitmap_start(ext2fs_block_bitmap bitmap)
|
|
{
|
|
return bitmap->start;
|
|
}
|
|
|
|
_INLINE_ ext2_ino_t ext2fs_get_inode_bitmap_start(ext2fs_inode_bitmap bitmap)
|
|
{
|
|
return bitmap->start;
|
|
}
|
|
|
|
_INLINE_ blk_t ext2fs_get_block_bitmap_end(ext2fs_block_bitmap bitmap)
|
|
{
|
|
return bitmap->end;
|
|
}
|
|
|
|
_INLINE_ ext2_ino_t ext2fs_get_inode_bitmap_end(ext2fs_inode_bitmap bitmap)
|
|
{
|
|
return bitmap->end;
|
|
}
|
|
|
|
_INLINE_ int ext2fs_test_block_bitmap_range(ext2fs_block_bitmap bitmap,
|
|
blk_t block, int num)
|
|
{
|
|
int i;
|
|
|
|
if ((block < bitmap->start) || (block+num-1 > bitmap->end)) {
|
|
ext2fs_warn_bitmap(EXT2_ET_BAD_BLOCK_TEST,
|
|
block, bitmap->description);
|
|
return 0;
|
|
}
|
|
for (i=0; i < num; i++) {
|
|
if (ext2fs_fast_test_block_bitmap(bitmap, block+i))
|
|
return 0;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
_INLINE_ int ext2fs_fast_test_block_bitmap_range(ext2fs_block_bitmap bitmap,
|
|
blk_t block, int num)
|
|
{
|
|
int i;
|
|
|
|
#ifdef EXT2FS_DEBUG_FAST_OPS
|
|
if ((block < bitmap->start) || (block+num-1 > bitmap->end)) {
|
|
ext2fs_warn_bitmap(EXT2_ET_BAD_BLOCK_TEST,
|
|
block, bitmap->description);
|
|
return 0;
|
|
}
|
|
#endif
|
|
for (i=0; i < num; i++) {
|
|
if (ext2fs_fast_test_block_bitmap(bitmap, block+i))
|
|
return 0;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
_INLINE_ void ext2fs_mark_block_bitmap_range(ext2fs_block_bitmap bitmap,
|
|
blk_t block, int num)
|
|
{
|
|
int i;
|
|
|
|
if ((block < bitmap->start) || (block+num-1 > bitmap->end)) {
|
|
ext2fs_warn_bitmap(EXT2_ET_BAD_BLOCK_MARK, block,
|
|
bitmap->description);
|
|
return;
|
|
}
|
|
for (i=0; i < num; i++)
|
|
ext2fs_set_bit(block + i - bitmap->start, bitmap->bitmap);
|
|
}
|
|
|
|
_INLINE_ void ext2fs_fast_mark_block_bitmap_range(ext2fs_block_bitmap bitmap,
|
|
blk_t block, int num)
|
|
{
|
|
int i;
|
|
|
|
#ifdef EXT2FS_DEBUG_FAST_OPS
|
|
if ((block < bitmap->start) || (block+num-1 > bitmap->end)) {
|
|
ext2fs_warn_bitmap(EXT2_ET_BAD_BLOCK_MARK, block,
|
|
bitmap->description);
|
|
return;
|
|
}
|
|
#endif
|
|
for (i=0; i < num; i++)
|
|
ext2fs_set_bit(block + i - bitmap->start, bitmap->bitmap);
|
|
}
|
|
|
|
_INLINE_ void ext2fs_unmark_block_bitmap_range(ext2fs_block_bitmap bitmap,
|
|
blk_t block, int num)
|
|
{
|
|
int i;
|
|
|
|
if ((block < bitmap->start) || (block+num-1 > bitmap->end)) {
|
|
ext2fs_warn_bitmap(EXT2_ET_BAD_BLOCK_UNMARK, block,
|
|
bitmap->description);
|
|
return;
|
|
}
|
|
for (i=0; i < num; i++)
|
|
ext2fs_clear_bit(block + i - bitmap->start, bitmap->bitmap);
|
|
}
|
|
|
|
_INLINE_ void ext2fs_fast_unmark_block_bitmap_range(ext2fs_block_bitmap bitmap,
|
|
blk_t block, int num)
|
|
{
|
|
int i;
|
|
|
|
#ifdef EXT2FS_DEBUG_FAST_OPS
|
|
if ((block < bitmap->start) || (block+num-1 > bitmap->end)) {
|
|
ext2fs_warn_bitmap(EXT2_ET_BAD_BLOCK_UNMARK, block,
|
|
bitmap->description);
|
|
return;
|
|
}
|
|
#endif
|
|
for (i=0; i < num; i++)
|
|
ext2fs_clear_bit(block + i - bitmap->start, bitmap->bitmap);
|
|
}
|
|
#undef _INLINE_
|
|
#endif
|
|
|