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