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2c2f090168
This initial commit has enough to make a new file system and print out it's structures. Signed-off-by: Zach Brown <zab@versity.com>
39 lines
665 B
C
39 lines
665 B
C
#define _GNU_SOURCE /* ffsll */
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#include <string.h>
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#include "lebitmap.h"
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void set_le_bit(__le64 *bits, u64 nr)
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{
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bits += nr / 64;
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*bits = cpu_to_le64(le64_to_cpu(*bits) | (1ULL << (nr & 63)));
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}
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void clear_le_bit(__le64 *bits, u64 nr)
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{
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bits += nr / 64;
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*bits = cpu_to_le64(le64_to_cpu(*bits) & ~(1ULL << (nr & 63)));
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}
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int test_le_bit(__le64 *bits, u64 nr)
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{
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bits += nr / 64;
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return !!(le64_to_cpu(*bits) & (1ULL << (nr & 63)));
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}
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/* returns -1 or nr */
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s64 find_first_le_bit(__le64 *bits, s64 count)
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{
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long nr;
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for (nr = 0; count > 0; bits++, nr += 64, count -= 64) {
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if (*bits)
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return nr + ffsll(le64_to_cpu(*bits)) - 1;
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}
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return -1;
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}
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