120 lines
3.2 KiB
C
120 lines
3.2 KiB
C
/*
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* (C) Copyright 2003 - 2004
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* Sysgo AG, <www.elinos.com>, Pavel Bartusek <pba@sysgo.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will 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 to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <common.h>
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#include <config.h>
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#include <reiserfs.h>
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#include "reiserfs_private.h"
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static block_dev_desc_t *reiserfs_block_dev_desc;
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static disk_partition_t part_info;
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int reiserfs_set_blk_dev(block_dev_desc_t *rbdd, int part)
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{
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reiserfs_block_dev_desc = rbdd;
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if (part == 0) {
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/* disk doesn't use partition table */
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part_info.start = 0;
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part_info.size = rbdd->lba;
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part_info.blksz = rbdd->blksz;
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} else {
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if (get_partition_info (reiserfs_block_dev_desc, part, &part_info)) {
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return 0;
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}
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}
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return (part_info.size);
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}
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int reiserfs_devread (int sector, int byte_offset, int byte_len, char *buf)
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{
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char sec_buf[SECTOR_SIZE];
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unsigned block_len;
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/*
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unsigned len = byte_len;
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u8 *start = buf;
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*/
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/*
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* Check partition boundaries
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*/
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if (sector < 0
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|| ((sector + ((byte_offset + byte_len - 1) >> SECTOR_BITS))
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>= part_info.size)) {
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/* errnum = ERR_OUTSIDE_PART; */
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printf (" ** reiserfs_devread() read outside partition\n");
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return 0;
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}
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/*
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* Get the read to the beginning of a partition.
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*/
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sector += byte_offset >> SECTOR_BITS;
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byte_offset &= SECTOR_SIZE - 1;
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#if defined(DEBUG)
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printf (" <%d, %d, %d> ", sector, byte_offset, byte_len);
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#endif
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if (reiserfs_block_dev_desc == NULL)
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return 0;
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if (byte_offset != 0) {
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/* read first part which isn't aligned with start of sector */
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if (reiserfs_block_dev_desc->block_read(reiserfs_block_dev_desc->dev,
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part_info.start+sector, 1, (unsigned long *)sec_buf) != 1) {
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printf (" ** reiserfs_devread() read error\n");
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return 0;
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}
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memcpy(buf, sec_buf+byte_offset, min(SECTOR_SIZE-byte_offset, byte_len));
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buf+=min(SECTOR_SIZE-byte_offset, byte_len);
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byte_len-=min(SECTOR_SIZE-byte_offset, byte_len);
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sector++;
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}
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/* read sector aligned part */
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block_len = byte_len & ~(SECTOR_SIZE-1);
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if (reiserfs_block_dev_desc->block_read(reiserfs_block_dev_desc->dev,
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part_info.start+sector, block_len/SECTOR_SIZE, (unsigned long *)buf) !=
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block_len/SECTOR_SIZE) {
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printf (" ** reiserfs_devread() read error - block\n");
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return 0;
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}
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buf+=block_len;
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byte_len-=block_len;
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sector+= block_len/SECTOR_SIZE;
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if ( byte_len != 0 ) {
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/* read rest of data which are not in whole sector */
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if (reiserfs_block_dev_desc->block_read(reiserfs_block_dev_desc->dev,
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part_info.start+sector, 1, (unsigned long *)sec_buf) != 1) {
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printf (" ** reiserfs_devread() read error - last part\n");
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return 0;
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}
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memcpy(buf, sec_buf, byte_len);
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}
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return 1;
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}
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