[thirdparty/e2fsprogs.git] / lib / ext2fs / rw_bitmaps.c

/*
 * rw_bitmaps.c --- routines to read and write the  inode and block bitmaps.
 *
 * Copyright (C) 1993, 1994, 1994, 1996 Theodore Ts'o.
 *
 * %Begin-Header%
 * This file may be redistributed under the terms of the GNU Public
 * License.
 * %End-Header%
 */

#include <stdio.h>
#include <string.h>
#if HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <fcntl.h>
#include <time.h>
#ifdef HAVE_SYS_STAT_H
#include <sys/stat.h>
#endif
#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif

#include "ext2_fs.h"
#include "ext2fs.h"
#include "e2image.h"

static errcode_t write_bitmaps(ext2_filsys fs, int do_inode, int do_block)
{
	dgrp_t 		i;
	unsigned int	j;
	int		block_nbytes, inode_nbytes;
	unsigned int	nbits;
	errcode_t	retval;
	char 		*block_buf, *inode_buf;
	int		csum_flag = 0;
	blk_t		blk;
	blk64_t		blk_itr = fs->super->s_first_data_block;
	ext2_ino_t	ino_itr = 1;

	EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);

	if (!(fs->flags & EXT2_FLAG_RW))
		return EXT2_ET_RO_FILSYS;

	if (EXT2_HAS_RO_COMPAT_FEATURE(fs->super,
				       EXT4_FEATURE_RO_COMPAT_GDT_CSUM))
		csum_flag = 1;

	inode_nbytes = block_nbytes = 0;
	if (do_block) {
		block_nbytes = EXT2_BLOCKS_PER_GROUP(fs->super) / 8;
		retval = ext2fs_get_mem(fs->blocksize, &block_buf);
		if (retval)
			return retval;
		memset(block_buf, 0xff, fs->blocksize);
	}
	if (do_inode) {
		inode_nbytes = (size_t)
			((EXT2_INODES_PER_GROUP(fs->super)+7) / 8);
		retval = ext2fs_get_mem(fs->blocksize, &inode_buf);
		if (retval)
			return retval;
		memset(inode_buf, 0xff, fs->blocksize);
	}

	for (i = 0; i < fs->group_desc_count; i++) {
		if (!do_block)
			goto skip_block_bitmap;

		if (csum_flag && ext2fs_bg_flag_test(fs, i, EXT2_BG_BLOCK_UNINIT)
		    )
			goto skip_this_block_bitmap;

		retval = ext2fs_get_block_bitmap_range2(fs->block_map,
				blk_itr, block_nbytes << 3, block_buf);
		if (retval)
			return retval;

		if (i == fs->group_desc_count - 1) {
			/* Force bitmap padding for the last group */
			nbits = ((ext2fs_blocks_count(fs->super)
				  - (__u64) fs->super->s_first_data_block)
				 % (__u64) EXT2_BLOCKS_PER_GROUP(fs->super));
			if (nbits)
				for (j = nbits; j < fs->blocksize * 8; j++)
					ext2fs_set_bit(j, block_buf);
		}
		blk = fs->group_desc[i].bg_block_bitmap;
		if (blk) {
			retval = io_channel_write_blk64(fs->io, blk, 1,
							block_buf);
			if (retval)
				return EXT2_ET_BLOCK_BITMAP_WRITE;
		}
	skip_this_block_bitmap:
		blk_itr += block_nbytes << 3;
	skip_block_bitmap:

		if (!do_inode)
			continue;

		if (csum_flag && ext2fs_bg_flag_test(fs, i, EXT2_BG_INODE_UNINIT)
		    )
			goto skip_this_inode_bitmap;

		retval = ext2fs_get_inode_bitmap_range2(fs->inode_map,
				ino_itr, inode_nbytes << 3, inode_buf);
		if (retval)
			return retval;

		blk = fs->group_desc[i].bg_inode_bitmap;
		if (blk) {
			retval = io_channel_write_blk64(fs->io, blk, 1,
						      inode_buf);
			if (retval)
				return EXT2_ET_INODE_BITMAP_WRITE;
		}
	skip_this_inode_bitmap:
		ino_itr += inode_nbytes << 3;

	}
	if (do_block) {
		fs->flags &= ~EXT2_FLAG_BB_DIRTY;
		ext2fs_free_mem(&block_buf);
	}
	if (do_inode) {
		fs->flags &= ~EXT2_FLAG_IB_DIRTY;
		ext2fs_free_mem(&inode_buf);
	}
	return 0;
}

static errcode_t read_bitmaps(ext2_filsys fs, int do_inode, int do_block)
{
	dgrp_t i;
	char *block_bitmap = 0, *inode_bitmap = 0;
	char *buf;
	errcode_t retval;
	int block_nbytes = EXT2_BLOCKS_PER_GROUP(fs->super) / 8;
	int inode_nbytes = EXT2_INODES_PER_GROUP(fs->super) / 8;
	int csum_flag = 0;
	int do_image = fs->flags & EXT2_FLAG_IMAGE_FILE;
	unsigned int	cnt;
	blk_t	blk;
	blk64_t	blk_itr = fs->super->s_first_data_block;
	blk_t   blk_cnt;
	ext2_ino_t ino_itr = 1;
	ext2_ino_t ino_cnt;

	EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);

	fs->write_bitmaps = ext2fs_write_bitmaps;

	if (EXT2_HAS_RO_COMPAT_FEATURE(fs->super,
				       EXT4_FEATURE_RO_COMPAT_GDT_CSUM))
		csum_flag = 1;

	retval = ext2fs_get_mem(strlen(fs->device_name) + 80, &buf);
	if (retval)
		return retval;
	if (do_block) {
		if (fs->block_map)
			ext2fs_free_block_bitmap(fs->block_map);
		strcpy(buf, "block bitmap for ");
		strcat(buf, fs->device_name);
		retval = ext2fs_allocate_block_bitmap(fs, buf, &fs->block_map);
		if (retval)
			goto cleanup;
		retval = ext2fs_get_mem(do_image ? fs->blocksize :
					(unsigned) block_nbytes, &block_bitmap);
		if (retval)
			goto cleanup;
	} else
		block_nbytes = 0;
	if (do_inode) {
		if (fs->inode_map)
			ext2fs_free_inode_bitmap(fs->inode_map);
		strcpy(buf, "inode bitmap for ");
		strcat(buf, fs->device_name);
		retval = ext2fs_allocate_inode_bitmap(fs, buf, &fs->inode_map);
		if (retval)
			goto cleanup;
		retval = ext2fs_get_mem(do_image ? fs->blocksize :
					(unsigned) inode_nbytes, &inode_bitmap);
		if (retval)
			goto cleanup;
	} else
		inode_nbytes = 0;
	ext2fs_free_mem(&buf);

	if (fs->flags & EXT2_FLAG_IMAGE_FILE) {
		blk = (fs->image_header->offset_inodemap / fs->blocksize);
		ino_cnt = fs->super->s_inodes_count;
		while (inode_nbytes > 0) {
			retval = io_channel_read_blk64(fs->image_io, blk++,
						     1, inode_bitmap);
			if (retval)
				goto cleanup;
			cnt = fs->blocksize << 3;
			if (cnt > ino_cnt)
				cnt = ino_cnt;
			retval = ext2fs_set_inode_bitmap_range2(fs->inode_map,
					       ino_itr, cnt, inode_bitmap);
			if (retval)
				goto cleanup;
			ino_itr += fs->blocksize << 3;
			ino_cnt -= fs->blocksize << 3;
			inode_nbytes -= fs->blocksize;
		}
		blk = (fs->image_header->offset_blockmap /
		       fs->blocksize);
		blk_cnt = (blk64_t)EXT2_BLOCKS_PER_GROUP(fs->super) *
			fs->group_desc_count;
		while (block_nbytes > 0) {
			retval = io_channel_read_blk64(fs->image_io, blk++,
						     1, block_bitmap);
			if (retval)
				goto cleanup;
			cnt = fs->blocksize << 3;
			if (cnt > blk_cnt)
				cnt = blk_cnt;
			retval = ext2fs_set_block_bitmap_range2(fs->block_map,
				       blk_itr, cnt, block_bitmap);
			if (retval)
				goto cleanup;
			blk_itr += fs->blocksize << 3;
			blk_cnt -= fs->blocksize << 3;
			block_nbytes -= fs->blocksize;
		}
		goto success_cleanup;
	}

	for (i = 0; i < fs->group_desc_count; i++) {
		if (block_bitmap) {
			blk = fs->group_desc[i].bg_block_bitmap;
			if (csum_flag &&
			    ext2fs_bg_flag_test(fs, i, EXT2_BG_BLOCK_UNINIT) &&
			    ext2fs_group_desc_csum_verify(fs, i))
				blk = 0;
			if (blk) {
				retval = io_channel_read_blk64(fs->io, blk,
					     -block_nbytes, block_bitmap);
				if (retval) {
					retval = EXT2_ET_BLOCK_BITMAP_READ;
					goto cleanup;
				}
			} else
				memset(block_bitmap, 0, block_nbytes);
			cnt = block_nbytes << 3;
			retval = ext2fs_set_block_bitmap_range2(fs->block_map,
					       blk_itr, cnt, block_bitmap);
			if (retval)
				goto cleanup;
			blk_itr += block_nbytes << 3;
		}
		if (inode_bitmap) {
			blk = fs->group_desc[i].bg_inode_bitmap;
			if (csum_flag &&
			    ext2fs_bg_flag_test(fs, i, EXT2_BG_INODE_UNINIT) &&
			    ext2fs_group_desc_csum_verify(fs, i))
				blk = 0;
			if (blk) {
				retval = io_channel_read_blk64(fs->io, blk,
					     -inode_nbytes, inode_bitmap);
				if (retval) {
					retval = EXT2_ET_INODE_BITMAP_READ;
					goto cleanup;
				}
			} else
				memset(inode_bitmap, 0, inode_nbytes);
			cnt = inode_nbytes << 3;
			retval = ext2fs_set_inode_bitmap_range2(fs->inode_map,
					       ino_itr, cnt, inode_bitmap);
			if (retval)
				goto cleanup;
			ino_itr += inode_nbytes << 3;
		}
	}
success_cleanup:
	if (inode_bitmap)
		ext2fs_free_mem(&inode_bitmap);
	if (block_bitmap)
		ext2fs_free_mem(&block_bitmap);
	return 0;

cleanup:
	if (do_block) {
		ext2fs_free_mem(&fs->block_map);
		fs->block_map = 0;
	}
	if (do_inode) {
		ext2fs_free_mem(&fs->inode_map);
		fs->inode_map = 0;
	}
	if (inode_bitmap)
		ext2fs_free_mem(&inode_bitmap);
	if (block_bitmap)
		ext2fs_free_mem(&block_bitmap);
	if (buf)
		ext2fs_free_mem(&buf);
	return retval;
}

errcode_t ext2fs_read_inode_bitmap(ext2_filsys fs)
{
	return read_bitmaps(fs, 1, 0);
}

errcode_t ext2fs_read_block_bitmap(ext2_filsys fs)
{
	return read_bitmaps(fs, 0, 1);
}

errcode_t ext2fs_write_inode_bitmap(ext2_filsys fs)
{
	return write_bitmaps(fs, 1, 0);
}

errcode_t ext2fs_write_block_bitmap (ext2_filsys fs)
{
	return write_bitmaps(fs, 0, 1);
}

errcode_t ext2fs_read_bitmaps(ext2_filsys fs)
{
	if (fs->inode_map && fs->block_map)
		return 0;

	return read_bitmaps(fs, !fs->inode_map, !fs->block_map);
}

errcode_t ext2fs_write_bitmaps(ext2_filsys fs)
{
	int do_inode = fs->inode_map && ext2fs_test_ib_dirty(fs);
	int do_block = fs->block_map && ext2fs_test_bb_dirty(fs);

	if (!do_inode && !do_block)
		return 0;

	return write_bitmaps(fs, do_inode, do_block);
}
Commit	Line	Data
f3db3566 TT	1	/*
	2	* rw_bitmaps.c --- routines to read and write the inode and block bitmaps.
	3	*
19c78dc0 TT	4	* Copyright (C) 1993, 1994, 1994, 1996 Theodore Ts'o.
	5	*
	6	* %Begin-Header%
	7	* This file may be redistributed under the terms of the GNU Public
	8	* License.
	9	* %End-Header%
f3db3566 TT	10	*/
	11
	12	#include <stdio.h>
	13	#include <string.h>
4cbe8af4	14	#if HAVE_UNISTD_H
f3db3566	15	#include <unistd.h>
4cbe8af4	16	#endif
f3db3566 TT	17	#include <fcntl.h>
f3db3566 TT	18	#include <time.h>
519ee043	19	#ifdef HAVE_SYS_STAT_H
f3db3566	20	#include <sys/stat.h>
519ee043 TT	21	#endif
519ee043 TT	22	#ifdef HAVE_SYS_TYPES_H
f3db3566	23	#include <sys/types.h>
519ee043	24	#endif
f3db3566	25
b5abe6fa	26	#include "ext2_fs.h"
f3db3566	27	#include "ext2fs.h"
a78926ef	28	#include "e2image.h"
f3db3566	29
1f2da2c0	30	static errcode_t write_bitmaps(ext2_filsys fs, int do_inode, int do_block)
f3db3566	31	{
2eb374c9	32	dgrp_t i;
54434927	33	unsigned int j;
1f2da2c0	34	int block_nbytes, inode_nbytes;
54434927	35	unsigned int nbits;
f3db3566	36	errcode_t retval;
1f2da2c0	37	char block_buf, inode_buf;
16b851cd	38	int csum_flag = 0;
19c78dc0	39	blk_t blk;
8f82ef98	40	blk64_t blk_itr = fs->super->s_first_data_block;
f1f115a7	41	ext2_ino_t ino_itr = 1;
f3db3566 TT	42
	43	EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
	44
	45	if (!(fs->flags & EXT2_FLAG_RW))
	46	return EXT2_ET_RO_FILSYS;
16b851cd TT	47
	48	if (EXT2_HAS_RO_COMPAT_FEATURE(fs->super,
	49	EXT4_FEATURE_RO_COMPAT_GDT_CSUM))
	50	csum_flag = 1;
	51
1f2da2c0	52	inode_nbytes = block_nbytes = 0;
1f2da2c0	53	if (do_block) {
1f2da2c0 TT	54	block_nbytes = EXT2_BLOCKS_PER_GROUP(fs->super) / 8;
	55	retval = ext2fs_get_mem(fs->blocksize, &block_buf);
	56	if (retval)
	57	return retval;
	58	memset(block_buf, 0xff, fs->blocksize);
	59	}
	60	if (do_inode) {
efc6f628	61	inode_nbytes = (size_t)
1f2da2c0 TT	62	((EXT2_INODES_PER_GROUP(fs->super)+7) / 8);
	63	retval = ext2fs_get_mem(fs->blocksize, &inode_buf);
	64	if (retval)
	65	return retval;
	66	memset(inode_buf, 0xff, fs->blocksize);
	67	}
	68
f3db3566	69	for (i = 0; i < fs->group_desc_count; i++) {
f1f115a7	70	if (!do_block)
1f2da2c0	71	goto skip_block_bitmap;
f5fa2007	72
732c8cd5 TT	73	if (csum_flag && ext2fs_bg_flag_test(fs, i, EXT2_BG_BLOCK_UNINIT)
732c8cd5 TT	74	)
f5fa2007	75	goto skip_this_block_bitmap;
efc6f628	76
8f82ef98	77	retval = ext2fs_get_block_bitmap_range2(fs->block_map,
f1f115a7 TT	78	blk_itr, block_nbytes << 3, block_buf);
	79	if (retval)
	80	return retval;
	81
f3db3566 TT	82	if (i == fs->group_desc_count - 1) {
f3db3566 TT	83	/* Force bitmap padding for the last group */
4efbac6f VAH	84	nbits = ((ext2fs_blocks_count(fs->super)
	85	- (__u64) fs->super->s_first_data_block)
	86	% (__u64) EXT2_BLOCKS_PER_GROUP(fs->super));
f3db3566 TT	87	if (nbits)
f3db3566 TT	88	for (j = nbits; j < fs->blocksize * 8; j++)
1f2da2c0	89	ext2fs_set_bit(j, block_buf);
f3db3566	90	}
19c78dc0 TT	91	blk = fs->group_desc[i].bg_block_bitmap;
19c78dc0 TT	92	if (blk) {
24a117ab VAH	93	retval = io_channel_write_blk64(fs->io, blk, 1,
24a117ab VAH	94	block_buf);
19c78dc0 TT	95	if (retval)
	96	return EXT2_ET_BLOCK_BITMAP_WRITE;
	97	}
f5fa2007	98	skip_this_block_bitmap:
f1f115a7	99	blk_itr += block_nbytes << 3;
1f2da2c0 TT	100	skip_block_bitmap:
1f2da2c0 TT	101
f1f115a7	102	if (!do_inode)
1f2da2c0 TT	103	continue;
1f2da2c0 TT	104
732c8cd5 TT	105	if (csum_flag && ext2fs_bg_flag_test(fs, i, EXT2_BG_INODE_UNINIT)
732c8cd5 TT	106	)
f5fa2007	107	goto skip_this_inode_bitmap;
efc6f628	108
8f82ef98	109	retval = ext2fs_get_inode_bitmap_range2(fs->inode_map,
f1f115a7 TT	110	ino_itr, inode_nbytes << 3, inode_buf);
	111	if (retval)
	112	return retval;
	113
1f2da2c0 TT	114	blk = fs->group_desc[i].bg_inode_bitmap;
1f2da2c0 TT	115	if (blk) {
24a117ab	116	retval = io_channel_write_blk64(fs->io, blk, 1,
1f2da2c0 TT	117	inode_buf);
	118	if (retval)
	119	return EXT2_ET_INODE_BITMAP_WRITE;
	120	}
f5fa2007	121	skip_this_inode_bitmap:
f1f115a7	122	ino_itr += inode_nbytes << 3;
1f2da2c0 TT	123
	124	}
	125	if (do_block) {
	126	fs->flags &= ~EXT2_FLAG_BB_DIRTY;
	127	ext2fs_free_mem(&block_buf);
	128	}
	129	if (do_inode) {
	130	fs->flags &= ~EXT2_FLAG_IB_DIRTY;
	131	ext2fs_free_mem(&inode_buf);
f3db3566	132	}
f3db3566 TT	133	return 0;
	134	}
	135
	136	static errcode_t read_bitmaps(ext2_filsys fs, int do_inode, int do_block)
	137	{
2eb374c9	138	dgrp_t i;
50e1e10f	139	char block_bitmap = 0, inode_bitmap = 0;
f3db3566 TT	140	char *buf;
f3db3566 TT	141	errcode_t retval;
57fd39e9 TT	142	int block_nbytes = EXT2_BLOCKS_PER_GROUP(fs->super) / 8;
57fd39e9 TT	143	int inode_nbytes = EXT2_INODES_PER_GROUP(fs->super) / 8;
16b851cd	144	int csum_flag = 0;
f1f115a7 TT	145	int do_image = fs->flags & EXT2_FLAG_IMAGE_FILE;
f1f115a7 TT	146	unsigned int cnt;
19c78dc0	147	blk_t blk;
8f82ef98	148	blk64_t blk_itr = fs->super->s_first_data_block;
f1f115a7 TT	149	blk_t blk_cnt;
	150	ext2_ino_t ino_itr = 1;
	151	ext2_ino_t ino_cnt;
f3db3566 TT	152
	153	EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
	154
	155	fs->write_bitmaps = ext2fs_write_bitmaps;
	156
16b851cd	157	if (EXT2_HAS_RO_COMPAT_FEATURE(fs->super,
d4f34d41	158	EXT4_FEATURE_RO_COMPAT_GDT_CSUM))
16b851cd	159	csum_flag = 1;
f5fa2007	160
c4e3d3f3	161	retval = ext2fs_get_mem(strlen(fs->device_name) + 80, &buf);
7b4e4534 TT	162	if (retval)
7b4e4534 TT	163	return retval;
f3db3566 TT	164	if (do_block) {
	165	if (fs->block_map)
	166	ext2fs_free_block_bitmap(fs->block_map);
2d40a91e TT	167	strcpy(buf, "block bitmap for ");
2d40a91e TT	168	strcat(buf, fs->device_name);
f3db3566 TT	169	retval = ext2fs_allocate_block_bitmap(fs, buf, &fs->block_map);
	170	if (retval)
	171	goto cleanup;
efc6f628	172	retval = ext2fs_get_mem(do_image ? fs->blocksize :
57fd39e9	173	(unsigned) block_nbytes, &block_bitmap);
f1f115a7 TT	174	if (retval)
	175	goto cleanup;
	176	} else
	177	block_nbytes = 0;
f3db3566 TT	178	if (do_inode) {
	179	if (fs->inode_map)
	180	ext2fs_free_inode_bitmap(fs->inode_map);
2d40a91e TT	181	strcpy(buf, "inode bitmap for ");
2d40a91e TT	182	strcat(buf, fs->device_name);
f3db3566 TT	183	retval = ext2fs_allocate_inode_bitmap(fs, buf, &fs->inode_map);
	184	if (retval)
	185	goto cleanup;
efc6f628	186	retval = ext2fs_get_mem(do_image ? fs->blocksize :
57fd39e9	187	(unsigned) inode_nbytes, &inode_bitmap);
f1f115a7 TT	188	if (retval)
	189	goto cleanup;
	190	} else
	191	inode_nbytes = 0;
c4e3d3f3	192	ext2fs_free_mem(&buf);
f3db3566	193
a78926ef	194	if (fs->flags & EXT2_FLAG_IMAGE_FILE) {
f1f115a7 TT	195	blk = (fs->image_header->offset_inodemap / fs->blocksize);
	196	ino_cnt = fs->super->s_inodes_count;
	197	while (inode_nbytes > 0) {
24a117ab	198	retval = io_channel_read_blk64(fs->image_io, blk++,
f1f115a7 TT	199	1, inode_bitmap);
	200	if (retval)
	201	goto cleanup;
	202	cnt = fs->blocksize << 3;
	203	if (cnt > ino_cnt)
	204	cnt = ino_cnt;
8f82ef98	205	retval = ext2fs_set_inode_bitmap_range2(fs->inode_map,
f1f115a7	206	ino_itr, cnt, inode_bitmap);
a78926ef TT	207	if (retval)
a78926ef TT	208	goto cleanup;
f1f115a7 TT	209	ino_itr += fs->blocksize << 3;
	210	ino_cnt -= fs->blocksize << 3;
	211	inode_nbytes -= fs->blocksize;
a78926ef	212	}
f1f115a7 TT	213	blk = (fs->image_header->offset_blockmap /
f1f115a7 TT	214	fs->blocksize);
c5b7b6ba	215	blk_cnt = (blk64_t)EXT2_BLOCKS_PER_GROUP(fs->super) *
f1f115a7 TT	216	fs->group_desc_count;
f1f115a7 TT	217	while (block_nbytes > 0) {
24a117ab	218	retval = io_channel_read_blk64(fs->image_io, blk++,
f1f115a7 TT	219	1, block_bitmap);
	220	if (retval)
	221	goto cleanup;
	222	cnt = fs->blocksize << 3;
	223	if (cnt > blk_cnt)
	224	cnt = blk_cnt;
8f82ef98	225	retval = ext2fs_set_block_bitmap_range2(fs->block_map,
f1f115a7	226	blk_itr, cnt, block_bitmap);
a78926ef TT	227	if (retval)
a78926ef TT	228	goto cleanup;
f1f115a7 TT	229	blk_itr += fs->blocksize << 3;
	230	blk_cnt -= fs->blocksize << 3;
	231	block_nbytes -= fs->blocksize;
a78926ef	232	}
f1f115a7	233	goto success_cleanup;
a78926ef TT	234	}
a78926ef TT	235
f3db3566	236	for (i = 0; i < fs->group_desc_count; i++) {
50e1e10f	237	if (block_bitmap) {
19c78dc0	238	blk = fs->group_desc[i].bg_block_bitmap;
732c8cd5 TT	239	if (csum_flag &&
732c8cd5 TT	240	ext2fs_bg_flag_test(fs, i, EXT2_BG_BLOCK_UNINIT) &&
d4f34d41	241	ext2fs_group_desc_csum_verify(fs, i))
f5fa2007	242	blk = 0;
19c78dc0	243	if (blk) {
24a117ab	244	retval = io_channel_read_blk64(fs->io, blk,
19c78dc0 TT	245	-block_nbytes, block_bitmap);
	246	if (retval) {
	247	retval = EXT2_ET_BLOCK_BITMAP_READ;
	248	goto cleanup;
	249	}
	250	} else
f4240c8d	251	memset(block_bitmap, 0, block_nbytes);
f1f115a7	252	cnt = block_nbytes << 3;
8f82ef98	253	retval = ext2fs_set_block_bitmap_range2(fs->block_map,
f1f115a7 TT	254	blk_itr, cnt, block_bitmap);
	255	if (retval)
	256	goto cleanup;
	257	blk_itr += block_nbytes << 3;
f3db3566	258	}
50e1e10f	259	if (inode_bitmap) {
19c78dc0	260	blk = fs->group_desc[i].bg_inode_bitmap;
732c8cd5 TT	261	if (csum_flag &&
732c8cd5 TT	262	ext2fs_bg_flag_test(fs, i, EXT2_BG_INODE_UNINIT) &&
d4f34d41	263	ext2fs_group_desc_csum_verify(fs, i))
f5fa2007	264	blk = 0;
19c78dc0	265	if (blk) {
24a117ab	266	retval = io_channel_read_blk64(fs->io, blk,
19c78dc0 TT	267	-inode_nbytes, inode_bitmap);
	268	if (retval) {
	269	retval = EXT2_ET_INODE_BITMAP_READ;
	270	goto cleanup;
	271	}
	272	} else
f4240c8d	273	memset(inode_bitmap, 0, inode_nbytes);
f1f115a7	274	cnt = inode_nbytes << 3;
8f82ef98	275	retval = ext2fs_set_inode_bitmap_range2(fs->inode_map,
f1f115a7 TT	276	ino_itr, cnt, inode_bitmap);
	277	if (retval)
	278	goto cleanup;
	279	ino_itr += inode_nbytes << 3;
f3db3566 TT	280	}
f3db3566 TT	281	}
f1f115a7 TT	282	success_cleanup:
	283	if (inode_bitmap)
	284	ext2fs_free_mem(&inode_bitmap);
	285	if (block_bitmap)
	286	ext2fs_free_mem(&block_bitmap);
f3db3566	287	return 0;
efc6f628	288
f3db3566 TT	289	cleanup:
f3db3566 TT	290	if (do_block) {
c4e3d3f3	291	ext2fs_free_mem(&fs->block_map);
f3db3566 TT	292	fs->block_map = 0;
	293	}
	294	if (do_inode) {
c4e3d3f3	295	ext2fs_free_mem(&fs->inode_map);
f3db3566 TT	296	fs->inode_map = 0;
f3db3566 TT	297	}
f1f115a7 TT	298	if (inode_bitmap)
	299	ext2fs_free_mem(&inode_bitmap);
	300	if (block_bitmap)
	301	ext2fs_free_mem(&block_bitmap);
f3db3566	302	if (buf)
c4e3d3f3	303	ext2fs_free_mem(&buf);
f3db3566 TT	304	return retval;
	305	}
	306
1f2da2c0	307	errcode_t ext2fs_read_inode_bitmap(ext2_filsys fs)
f3db3566 TT	308	{
	309	return read_bitmaps(fs, 1, 0);
	310	}
	311
	312	errcode_t ext2fs_read_block_bitmap(ext2_filsys fs)
	313	{
	314	return read_bitmaps(fs, 0, 1);
	315	}
	316
1f2da2c0	317	errcode_t ext2fs_write_inode_bitmap(ext2_filsys fs)
f3db3566	318	{
1f2da2c0 TT	319	return write_bitmaps(fs, 1, 0);
1f2da2c0 TT	320	}
f3db3566	321
1f2da2c0 TT	322	errcode_t ext2fs_write_block_bitmap (ext2_filsys fs)
	323	{
	324	return write_bitmaps(fs, 0, 1);
	325	}
f3db3566	326
1f2da2c0 TT	327	errcode_t ext2fs_read_bitmaps(ext2_filsys fs)
1f2da2c0 TT	328	{
9abd2ce9 TT	329	if (fs->inode_map && fs->block_map)
	330	return 0;
	331
f3db3566 TT	332	return read_bitmaps(fs, !fs->inode_map, !fs->block_map);
	333	}
	334
	335	errcode_t ext2fs_write_bitmaps(ext2_filsys fs)
	336	{
1f2da2c0 TT	337	int do_inode = fs->inode_map && ext2fs_test_ib_dirty(fs);
1f2da2c0 TT	338	int do_block = fs->block_map && ext2fs_test_bb_dirty(fs);
f3db3566	339
1f2da2c0 TT	340	if (!do_inode && !do_block)
1f2da2c0 TT	341	return 0;
f3db3566	342
1f2da2c0 TT	343	return write_bitmaps(fs, do_inode, do_block);
1f2da2c0 TT	344	}