libxfs: add xfs_bit.c

The header side of xfs_bit.c is already in libxfs, and the sparse
inode code requires the xfs_next_bit() function so pull in the
xfs_bit.c file so that a sparse inode enabled libxfs compiles
cleanly in userspace.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Brian Foster <bfoster@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>

1 files changed, 0 insertions, 118 deletions

diff --git a/fs/xfs/xfs_bit.c b/fs/xfs/xfs_bit.c
deleted file mode 100644
index 0e8885a59646..000000000000
--- a/fs/xfs/xfs_bit.c
+++ /dev/null
@@ -1,118 +0,0 @@
-/*
- * Copyright (c) 2000-2005 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
- */
-#include "xfs.h"
-#include "xfs_log_format.h"
-#include "xfs_bit.h"
-
-/*
- * XFS bit manipulation routines, used in non-realtime code.
- */
-
-/*
- * Return whether bitmap is empty.
- * Size is number of words in the bitmap, which is padded to word boundary
- * Returns 1 for empty, 0 for non-empty.
- */
-int
-xfs_bitmap_empty(uint *map, uint size)
-{
-	uint i;
-	uint ret = 0;
-
-	for (i = 0; i < size; i++) {
-		ret |= map[i];
-	}
-
-	return (ret == 0);
-}
-
-/*
- * Count the number of contiguous bits set in the bitmap starting with bit
- * start_bit.  Size is the size of the bitmap in words.
- */
-int
-xfs_contig_bits(uint *map, uint	size, uint start_bit)
-{
-	uint * p = ((unsigned int *) map) + (start_bit >> BIT_TO_WORD_SHIFT);
-	uint result = 0;
-	uint tmp;
-
-	size <<= BIT_TO_WORD_SHIFT;
-
-	ASSERT(start_bit < size);
-	size -= start_bit & ~(NBWORD - 1);
-	start_bit &= (NBWORD - 1);
-	if (start_bit) {
-		tmp = *p++;
-		/* set to one first offset bits prior to start */
-		tmp |= (~0U >> (NBWORD-start_bit));
-		if (tmp != ~0U)
-			goto found;
-		result += NBWORD;
-		size -= NBWORD;
-	}
-	while (size) {
-		if ((tmp = *p++) != ~0U)
-			goto found;
-		result += NBWORD;
-		size -= NBWORD;
-	}
-	return result - start_bit;
-found:
-	return result + ffz(tmp) - start_bit;
-}
-
-/*
- * This takes the bit number to start looking from and
- * returns the next set bit from there.  It returns -1
- * if there are no more bits set or the start bit is
- * beyond the end of the bitmap.
- *
- * Size is the number of words, not bytes, in the bitmap.
- */
-int xfs_next_bit(uint *map, uint size, uint start_bit)
-{
-	uint * p = ((unsigned int *) map) + (start_bit >> BIT_TO_WORD_SHIFT);
-	uint result = start_bit & ~(NBWORD - 1);
-	uint tmp;
-
-	size <<= BIT_TO_WORD_SHIFT;
-
-	if (start_bit >= size)
-		return -1;
-	size -= result;
-	start_bit &= (NBWORD - 1);
-	if (start_bit) {
-		tmp = *p++;
-		/* set to zero first offset bits prior to start */
-		tmp &= (~0U << start_bit);
-		if (tmp != 0U)
-			goto found;
-		result += NBWORD;
-		size -= NBWORD;
-	}
-	while (size) {
-		if ((tmp = *p++) != 0U)
-			goto found;
-		result += NBWORD;
-		size -= NBWORD;
-	}
-	return -1;
-found:
-	return result + ffs(tmp) - 1;
-}