/* * Copyright (c) 2013 Grzegorz Kostka (kostka.grzegorz@gmail.com) * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * - Redistributions of source code must retain the above copyright *   notice, this list of conditions and the following disclaimer. * - Redistributions in binary form must reproduce the above copyright *   notice, this list of conditions and the following disclaimer in the *   documentation and/or other materials provided with the distribution. * - The name of the author may not be used to endorse or promote products *   derived from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ /** @addtogroup lwext4 * @{ *//** * @file  ext4_bitmap.c * @brief Block/inode bitmap allocator. */ #include <ext4_config.h>#include <ext4_types.h>#include <ext4_misc.h>#include <ext4_errno.h>#include <ext4_debug.h>#include <ext4_bitmap.h>#include <string.h> void ext4_bmap_bits_free(uint8_t *bmap, uint32_t sbit, uint32_t bcnt){	uint32_t i = sbit; 	while (i & 7) { 		if (!bcnt)			return; 		ext4_bmap_bit_clr(bmap, i); 		bcnt--;		i++;	}	sbit = i;	bmap += sbit >> 3; 	memset(bmap, 0, bcnt >> 3);	bmap += bcnt >> 3; 	for (i = 0; i < bcnt; ++i) {		ext4_bmap_bit_clr(bmap, i);	}} int ext4_bmap_bit_find_clr(uint8_t *bmap, uint32_t sbit, uint32_t ebit,			   uint32_t *bit_id){	uint32_t i;	uint32_t bcnt = ebit - sbit; 	i = sbit; 	while (i & 7) { 		if (!bcnt)			return ENOSPC; 		if (ext4_bmap_is_bit_clr(bmap, i)) {			*bit_id = sbit;			return EOK;		} 		i++;		bcnt--;	} 	sbit = i;	bmap += (sbit >> 3); 	while (bcnt >= 8) {		if (*bmap != 0xFF) {			for (i = 0; i < 8; ++i) {				if (ext4_bmap_is_bit_clr(bmap, i)) {					*bit_id = sbit + i;					return EOK;				}			}		} 		bmap += 1;		bcnt -= 8;		sbit += 8;	} 	for (i = 0; i < bcnt; ++i) {		if (ext4_bmap_is_bit_clr(bmap, i)) {			*bit_id = sbit + i;			return EOK;		}	} 	return ENOSPC;} /** * @} */