Release 4.11 fs/xfs/libxfs/xfs_bit.h
/*
* Copyright (c) 2000,2002,2005 Silicon Graphics, Inc.
* All Rights Reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it would be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef __XFS_BIT_H__
#define __XFS_BIT_H__
/*
* XFS bit manipulation routines.
*/
/*
* masks with n high/low bits set, 64-bit values
*/
static inline __uint64_t xfs_mask64hi(int n)
{
return (__uint64_t)-1 << (64 - (n));
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Nathan Scott | 19 | 76.00% | 1 | 50.00% |
| Christoph Hellwig | 6 | 24.00% | 1 | 50.00% |
| Total | 25 | 100.00% | 2 | 100.00% |
static inline __uint32_t xfs_mask32lo(int n)
{
return ((__uint32_t)1 << (n)) - 1;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Nathan Scott | 18 | 75.00% | 1 | 50.00% |
| Christoph Hellwig | 6 | 25.00% | 1 | 50.00% |
| Total | 24 | 100.00% | 2 | 100.00% |
static inline __uint64_t xfs_mask64lo(int n)
{
return ((__uint64_t)1 << (n)) - 1;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Nathan Scott | 21 | 87.50% | 1 | 50.00% |
| Christoph Hellwig | 3 | 12.50% | 1 | 50.00% |
| Total | 24 | 100.00% | 2 | 100.00% |
/* Get high bit set out of 32-bit argument, -1 if none set */
static inline int xfs_highbit32(__uint32_t v)
{
return fls(v) - 1;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| David Chinner | 12 | 66.67% | 1 | 50.00% |
| Christoph Hellwig | 6 | 33.33% | 1 | 50.00% |
| Total | 18 | 100.00% | 2 | 100.00% |
/* Get high bit set out of 64-bit argument, -1 if none set */
static inline int xfs_highbit64(__uint64_t v)
{
return fls64(v) - 1;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| David Chinner | 13 | 72.22% | 1 | 50.00% |
| Christoph Hellwig | 5 | 27.78% | 1 | 50.00% |
| Total | 18 | 100.00% | 2 | 100.00% |
/* Get low bit set out of 32-bit argument, -1 if none set */
static inline int xfs_lowbit32(__uint32_t v)
{
return ffs(v) - 1;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| David Chinner | 16 | 88.89% | 2 | 66.67% |
| Barry Naujok | 2 | 11.11% | 1 | 33.33% |
| Total | 18 | 100.00% | 3 | 100.00% |
/* Get low bit set out of 64-bit argument, -1 if none set */
static inline int xfs_lowbit64(__uint64_t v)
{
__uint32_t w = (__uint32_t)v;
int n = 0;
if (w) { /* lower bits */
n = ffs(w);
} else { /* upper bits */
w = (__uint32_t)(v >> 32);
if (w) {
n = ffs(w);
if (n)
n += 32;
}
}
return n - 1;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| David Chinner | 68 | 87.18% | 1 | 33.33% |
| Dan Carpenter | 7 | 8.97% | 1 | 33.33% |
| Christoph Hellwig | 3 | 3.85% | 1 | 33.33% |
| Total | 78 | 100.00% | 3 | 100.00% |
/* Return whether bitmap is empty (1 == empty) */
extern int xfs_bitmap_empty(uint *map, uint size);
/* Count continuous one bits in map starting with start_bit */
extern int xfs_contig_bits(uint *map, uint size, uint start_bit);
/* Find next set bit in map */
extern int xfs_next_bit(uint *map, uint size, uint start_bit);
#endif /* __XFS_BIT_H__ */
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| David Chinner | 112 | 42.11% | 2 | 22.22% |
| Christoph Hellwig | 83 | 31.20% | 1 | 11.11% |
| Nathan Scott | 59 | 22.18% | 2 | 22.22% |
| Dan Carpenter | 7 | 2.63% | 1 | 11.11% |
| Eric Sandeen | 3 | 1.13% | 2 | 22.22% |
| Barry Naujok | 2 | 0.75% | 1 | 11.11% |
| Total | 266 | 100.00% | 9 | 100.00% |
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