1997-04-26 17:21:57 +04:00
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/*
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1997-04-26 17:58:21 +04:00
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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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1997-04-26 17:21:57 +04:00
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*
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1997-04-26 17:58:21 +04:00
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* Copyright (C) 1993, 1994, 1995 Theodore Ts'o. This file may be
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1997-04-26 17:21:57 +04:00
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* redistributed under the terms of the GNU Public License.
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*
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* Taken from <asm/bitops.h>, Copyright 1992, Linus Torvalds.
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*/
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1997-04-26 18:37:06 +04:00
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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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1997-04-26 17:58:21 +04:00
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extern __u16 ext2fs_swab16(__u16 val);
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extern __u32 ext2fs_swab32(__u32 val);
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1997-04-26 17:21:57 +04:00
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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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1997-04-26 17:34:30 +04:00
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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_mark_block_bitmap(ext2fs_block_bitmap bitmap, blk_t block);
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extern void 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 void ext2fs_mark_inode_bitmap(ext2fs_inode_bitmap bitmap, ino_t inode);
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extern void ext2fs_unmark_inode_bitmap(ext2fs_inode_bitmap bitmap,
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ino_t inode);
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extern int ext2fs_test_inode_bitmap(ext2fs_inode_bitmap bitmap, ino_t inode);
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1997-04-26 17:21:57 +04:00
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1997-04-26 17:58:21 +04:00
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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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ino_t inode);
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extern void ext2fs_fast_unmark_inode_bitmap(ext2fs_inode_bitmap bitmap,
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ino_t inode);
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extern int ext2fs_fast_test_inode_bitmap(ext2fs_inode_bitmap bitmap,
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ino_t inode);
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extern blk_t ext2fs_get_block_bitmap_start(ext2fs_block_bitmap bitmap);
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extern blk_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 blk_t ext2fs_get_inode_bitmap_end(ext2fs_inode_bitmap bitmap);
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1997-04-26 17:21:57 +04:00
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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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1997-04-26 17:58:21 +04:00
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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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1997-04-26 17:21:57 +04:00
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*/
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1997-04-26 17:58:21 +04:00
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#ifdef NO_INLINE_FUNCS
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#if (defined(__i386__) || defined(__i486__) || defined(__i586__) || \
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defined(__mc68000__) || 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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1997-04-26 17:21:57 +04:00
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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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#define _INLINE_ extern __inline__
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#endif
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#if (defined(__i386__) || defined(__i486__) || defined(__i586__))
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1997-04-26 17:34:30 +04:00
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#define _EXT2_HAVE_ASM_BITOPS_
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1997-04-26 17:21:57 +04:00
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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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1997-04-26 18:37:06 +04:00
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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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1997-04-26 17:21:57 +04:00
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1997-04-26 18:37:06 +04:00
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_INLINE_ int ext2fs_set_bit(int nr, void * addr)
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1997-04-26 17:21:57 +04:00
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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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1997-04-26 18:37:06 +04:00
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:"=r" (oldbit),"=m" (EXT2FS_ADDR)
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1997-04-26 17:21:57 +04:00
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:"r" (nr));
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return oldbit;
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}
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1997-04-26 18:37:06 +04:00
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_INLINE_ int ext2fs_clear_bit(int nr, void * addr)
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1997-04-26 17:21:57 +04:00
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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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1997-04-26 18:37:06 +04:00
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:"=r" (oldbit),"=m" (EXT2FS_ADDR)
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1997-04-26 17:21:57 +04:00
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:"r" (nr));
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return oldbit;
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}
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1997-04-26 18:37:06 +04:00
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_INLINE_ int ext2fs_test_bit(int nr, const void * addr)
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1997-04-26 17:21:57 +04:00
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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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1997-04-26 18:37:06 +04:00
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:"m" (EXT2FS_CONST_ADDR),"r" (nr));
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1997-04-26 17:21:57 +04:00
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return oldbit;
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}
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1997-04-26 18:37:06 +04:00
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#undef EXT2FS_ADDR
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1997-04-26 17:21:57 +04:00
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#endif /* i386 */
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1997-04-26 17:34:30 +04:00
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#ifdef __mc68000__
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#define _EXT2_HAVE_ASM_BITOPS_
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1997-04-26 18:37:06 +04:00
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_INLINE_ int ext2fs_set_bit(int nr,void * addr)
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1997-04-26 17:34:30 +04:00
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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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1997-04-26 18:48:50 +04:00
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: "=d" (retval) : "d" (nr^7), "a" (addr));
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1997-04-26 17:34:30 +04:00
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return retval;
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}
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1997-04-26 18:37:06 +04:00
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_INLINE_ int ext2fs_clear_bit(int nr, void * addr)
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1997-04-26 17:34:30 +04:00
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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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1997-04-26 18:48:50 +04:00
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: "=d" (retval) : "d" (nr^7), "a" (addr));
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1997-04-26 17:34:30 +04:00
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return retval;
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}
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1997-04-26 18:37:06 +04:00
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_INLINE_ int ext2fs_test_bit(int nr, const void * addr)
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1997-04-26 17:34:30 +04:00
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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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1997-04-26 18:48:50 +04:00
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: "=d" (retval) : "d" (nr^7), "a" (addr));
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1997-04-26 17:34:30 +04:00
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return retval;
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}
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#endif /* __mc68000__ */
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1997-04-26 17:58:21 +04:00
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#ifdef __sparc__
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#define _EXT2_HAVE_ASM_BITOPS_
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1997-04-26 18:37:06 +04:00
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_INLINE_ int ext2fs_set_bit(int nr, void *addr)
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1997-04-26 17:58:21 +04:00
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{
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int mask, retval;
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unsigned long *ADDR = (unsigned long *) addr;
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ADDR += nr >> 5;
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mask = 1 << (nr & 31);
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retval = ((mask & *ADDR) != 0);
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*ADDR |= mask;
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return retval;
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}
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1997-04-26 18:37:06 +04:00
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_INLINE_ int ext2fs_clear_bit(int nr, void *addr)
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1997-04-26 17:58:21 +04:00
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{
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int mask, retval;
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unsigned long *ADDR = (unsigned long *) addr;
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ADDR += nr >> 5;
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mask = 1 << (nr & 31);
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retval = ((mask & *ADDR) != 0);
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*ADDR &= ~mask;
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return retval;
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}
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1997-04-26 18:37:06 +04:00
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_INLINE_ int ext2fs_test_bit(int nr, const void *addr)
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1997-04-26 17:58:21 +04:00
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{
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int mask;
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const unsigned long *ADDR = (const unsigned long *) addr;
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ADDR += nr >> 5;
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mask = 1 << (nr & 31);
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return ((mask & *ADDR) != 0);
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}
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#endif /* __sparc__ */
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#ifndef _EXT2_HAVE_ASM_SWAB
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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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1997-04-26 17:34:30 +04:00
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_INLINE_ void ext2fs_mark_block_bitmap(ext2fs_block_bitmap bitmap,
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blk_t block)
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1997-04-26 17:21:57 +04:00
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{
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1997-04-26 17:34:30 +04:00
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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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1997-04-26 17:21:57 +04:00
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return;
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}
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1997-04-26 18:37:06 +04:00
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ext2fs_set_bit(block - bitmap->start, bitmap->bitmap);
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1997-04-26 17:21:57 +04:00
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}
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1997-04-26 17:34:30 +04:00
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_INLINE_ void ext2fs_unmark_block_bitmap(ext2fs_block_bitmap bitmap,
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blk_t block)
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1997-04-26 17:21:57 +04:00
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{
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1997-04-26 17:34:30 +04:00
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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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1997-04-26 17:21:57 +04:00
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return;
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}
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1997-04-26 18:37:06 +04:00
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ext2fs_clear_bit(block - bitmap->start, bitmap->bitmap);
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1997-04-26 17:21:57 +04:00
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}
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1997-04-26 17:34:30 +04:00
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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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1997-04-26 17:21:57 +04:00
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{
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1997-04-26 17:34:30 +04:00
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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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1997-04-26 17:21:57 +04:00
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return 0;
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}
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1997-04-26 18:37:06 +04:00
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return ext2fs_test_bit(block - bitmap->start, bitmap->bitmap);
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1997-04-26 17:21:57 +04:00
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}
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1997-04-26 17:34:30 +04:00
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_INLINE_ void ext2fs_mark_inode_bitmap(ext2fs_inode_bitmap bitmap,
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ino_t inode)
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1997-04-26 17:21:57 +04:00
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{
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1997-04-26 17:34:30 +04:00
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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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1997-04-26 17:21:57 +04:00
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return;
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}
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1997-04-26 18:37:06 +04:00
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ext2fs_set_bit(inode - bitmap->start, bitmap->bitmap);
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1997-04-26 17:21:57 +04:00
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}
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1997-04-26 17:34:30 +04:00
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_INLINE_ void ext2fs_unmark_inode_bitmap(ext2fs_inode_bitmap bitmap,
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ino_t inode)
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1997-04-26 17:21:57 +04:00
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{
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1997-04-26 17:34:30 +04:00
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if ((inode < bitmap->start) || (inode > bitmap->end)) {
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ext2fs_warn_bitmap(EXT2_ET_BAD_INODE_UNMARK,
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inode, bitmap->description);
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1997-04-26 17:21:57 +04:00
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return;
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}
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1997-04-26 18:37:06 +04:00
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ext2fs_clear_bit(inode - bitmap->start, bitmap->bitmap);
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1997-04-26 17:21:57 +04:00
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}
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1997-04-26 17:34:30 +04:00
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_INLINE_ int ext2fs_test_inode_bitmap(ext2fs_inode_bitmap bitmap,
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ino_t inode)
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1997-04-26 17:21:57 +04:00
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{
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1997-04-26 17:34:30 +04:00
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if ((inode < bitmap->start) || (inode > bitmap->end)) {
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ext2fs_warn_bitmap(EXT2_ET_BAD_INODE_TEST,
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inode, bitmap->description);
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1997-04-26 17:21:57 +04:00
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return 0;
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}
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1997-04-26 18:37:06 +04:00
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return ext2fs_test_bit(inode - bitmap->start, bitmap->bitmap);
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1997-04-26 17:21:57 +04:00
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}
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1997-04-26 17:58:21 +04:00
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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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1997-04-26 18:37:06 +04:00
|
|
|
ext2fs_set_bit(block - bitmap->start, bitmap->bitmap);
|
1997-04-26 17:58:21 +04:00
|
|
|
}
|
|
|
|
|
|
|
|
_INLINE_ void ext2fs_fast_unmark_block_bitmap(ext2fs_block_bitmap bitmap,
|
|
|
|
blk_t block)
|
|
|
|
{
|
|
|
|
#ifdef EXT2FS_DEBUG_FAST_OPS
|
|
|
|
if ((block < bitmap->start) || (block > bitmap->end)) {
|
|
|
|
ext2fs_warn_bitmap(EXT2_ET_BAD_BLOCK_UNMARK,
|
|
|
|
block, bitmap->description);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
#endif
|
1997-04-26 18:37:06 +04:00
|
|
|
ext2fs_clear_bit(block - bitmap->start, bitmap->bitmap);
|
1997-04-26 17:58:21 +04:00
|
|
|
}
|
|
|
|
|
|
|
|
_INLINE_ int ext2fs_fast_test_block_bitmap(ext2fs_block_bitmap bitmap,
|
|
|
|
blk_t block)
|
|
|
|
{
|
|
|
|
#ifdef EXT2FS_DEBUG_FAST_OPS
|
|
|
|
if ((block < bitmap->start) || (block > bitmap->end)) {
|
|
|
|
ext2fs_warn_bitmap(EXT2_ET_BAD_BLOCK_TEST,
|
|
|
|
block, bitmap->description);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
#endif
|
1997-04-26 18:37:06 +04:00
|
|
|
return ext2fs_test_bit(block - bitmap->start, bitmap->bitmap);
|
1997-04-26 17:58:21 +04:00
|
|
|
}
|
|
|
|
|
|
|
|
_INLINE_ void ext2fs_fast_mark_inode_bitmap(ext2fs_inode_bitmap bitmap,
|
|
|
|
ino_t inode)
|
|
|
|
{
|
|
|
|
#ifdef EXT2FS_DEBUG_FAST_OPS
|
|
|
|
if ((inode < bitmap->start) || (inode > bitmap->end)) {
|
|
|
|
ext2fs_warn_bitmap(EXT2_ET_BAD_INODE_MARK,
|
|
|
|
inode, bitmap->description);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
#endif
|
1997-04-26 18:37:06 +04:00
|
|
|
ext2fs_set_bit(inode - bitmap->start, bitmap->bitmap);
|
1997-04-26 17:58:21 +04:00
|
|
|
}
|
|
|
|
|
|
|
|
_INLINE_ void ext2fs_fast_unmark_inode_bitmap(ext2fs_inode_bitmap bitmap,
|
|
|
|
ino_t inode)
|
|
|
|
{
|
|
|
|
#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
|
1997-04-26 18:37:06 +04:00
|
|
|
ext2fs_clear_bit(inode - bitmap->start, bitmap->bitmap);
|
1997-04-26 17:58:21 +04:00
|
|
|
}
|
|
|
|
|
|
|
|
_INLINE_ int ext2fs_fast_test_inode_bitmap(ext2fs_inode_bitmap bitmap,
|
|
|
|
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
|
1997-04-26 18:37:06 +04:00
|
|
|
return ext2fs_test_bit(inode - bitmap->start, bitmap->bitmap);
|
1997-04-26 17:58:21 +04:00
|
|
|
}
|
|
|
|
|
|
|
|
_INLINE_ blk_t ext2fs_get_block_bitmap_start(ext2fs_block_bitmap bitmap)
|
|
|
|
{
|
|
|
|
return bitmap->start;
|
|
|
|
}
|
|
|
|
|
|
|
|
_INLINE_ blk_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_ blk_t ext2fs_get_inode_bitmap_end(ext2fs_inode_bitmap bitmap)
|
|
|
|
{
|
|
|
|
return bitmap->end;
|
|
|
|
}
|
|
|
|
|
1997-04-26 17:21:57 +04:00
|
|
|
#undef _INLINE_
|
|
|
|
#endif
|
1997-04-26 17:58:21 +04:00
|
|
|
|