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239880ef64
xfs_trans.h has a dependency on xfs_log.h for a couple of structures. Most code that does transactions doesn't need to know anything about the log, but this dependency means that they have to include xfs_log.h. Decouple the xfs_trans.h and xfs_log.h header files and clean up the includes to be in dependency order. In doing this, remove the direct include of xfs_trans_reserve.h from xfs_trans.h so that we remove the dependency between xfs_trans.h and xfs_mount.h. Hence the xfs_trans.h include can be moved to the indicate the actual dependencies other header files have on it. Note that these are kernel only header files, so this does not translate to any userspace changes at all. Signed-off-by: Dave Chinner <dchinner@redhat.com> Reviewed-by: Ben Myers <bpm@sgi.com> Signed-off-by: Ben Myers <bpm@sgi.com>
118 lines
2.8 KiB
C
118 lines
2.8 KiB
C
/*
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* Copyright (c) 2000-2005 Silicon Graphics, Inc.
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* All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it would be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "xfs.h"
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#include "xfs_log_format.h"
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/*
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* XFS bit manipulation routines, used in non-realtime code.
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*/
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/*
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* Return whether bitmap is empty.
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* Size is number of words in the bitmap, which is padded to word boundary
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* Returns 1 for empty, 0 for non-empty.
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*/
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int
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xfs_bitmap_empty(uint *map, uint size)
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{
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uint i;
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uint ret = 0;
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for (i = 0; i < size; i++) {
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ret |= map[i];
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}
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return (ret == 0);
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}
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/*
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* Count the number of contiguous bits set in the bitmap starting with bit
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* start_bit. Size is the size of the bitmap in words.
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*/
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int
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xfs_contig_bits(uint *map, uint size, uint start_bit)
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{
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uint * p = ((unsigned int *) map) + (start_bit >> BIT_TO_WORD_SHIFT);
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uint result = 0;
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uint tmp;
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size <<= BIT_TO_WORD_SHIFT;
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ASSERT(start_bit < size);
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size -= start_bit & ~(NBWORD - 1);
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start_bit &= (NBWORD - 1);
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if (start_bit) {
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tmp = *p++;
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/* set to one first offset bits prior to start */
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tmp |= (~0U >> (NBWORD-start_bit));
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if (tmp != ~0U)
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goto found;
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result += NBWORD;
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size -= NBWORD;
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}
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while (size) {
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if ((tmp = *p++) != ~0U)
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goto found;
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result += NBWORD;
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size -= NBWORD;
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}
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return result - start_bit;
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found:
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return result + ffz(tmp) - start_bit;
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}
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/*
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* This takes the bit number to start looking from and
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* returns the next set bit from there. It returns -1
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* if there are no more bits set or the start bit is
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* beyond the end of the bitmap.
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*
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* Size is the number of words, not bytes, in the bitmap.
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*/
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int xfs_next_bit(uint *map, uint size, uint start_bit)
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{
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uint * p = ((unsigned int *) map) + (start_bit >> BIT_TO_WORD_SHIFT);
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uint result = start_bit & ~(NBWORD - 1);
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uint tmp;
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size <<= BIT_TO_WORD_SHIFT;
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if (start_bit >= size)
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return -1;
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size -= result;
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start_bit &= (NBWORD - 1);
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if (start_bit) {
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tmp = *p++;
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/* set to zero first offset bits prior to start */
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tmp &= (~0U << start_bit);
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if (tmp != 0U)
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goto found;
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result += NBWORD;
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size -= NBWORD;
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}
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while (size) {
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if ((tmp = *p++) != 0U)
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goto found;
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result += NBWORD;
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size -= NBWORD;
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}
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return -1;
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found:
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return result + ffs(tmp) - 1;
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}
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