1 /* 2 * (C) Copyright 2003 - 2004 3 * Sysgo AG, <www.elinos.com>, Pavel Bartusek <pba@sysgo.com> 4 * 5 * This program is free software; you can redistribute it and/or modify 6 * it under the terms of the GNU General Public License as published by 7 * the Free Software Foundation; either version 2 of the License, or 8 * (at your option) any later version. 9 * 10 * This program is distributed in the hope that it will be useful, 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 * GNU General Public License for more details. 14 * 15 * You should have received a copy of the GNU General Public License 16 * along with this program; if not, write to the Free Software 17 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 18 */ 19 20 21 #include <common.h> 22 #if (CONFIG_COMMANDS & CFG_CMD_REISER) 23 24 #include <config.h> 25 #include <reiserfs.h> 26 27 #include "reiserfs_private.h" 28 29 static block_dev_desc_t *reiserfs_block_dev_desc; 30 static disk_partition_t part_info; 31 32 33 int reiserfs_set_blk_dev(block_dev_desc_t *rbdd, int part) 34 { 35 reiserfs_block_dev_desc = rbdd; 36 37 if (part == 0) { 38 /* disk doesn't use partition table */ 39 part_info.start = 0; 40 part_info.size = rbdd->lba; 41 part_info.blksz = rbdd->blksz; 42 } else { 43 if (get_partition_info (reiserfs_block_dev_desc, part, &part_info)) { 44 return 0; 45 } 46 } 47 return (part_info.size); 48 } 49 50 51 int reiserfs_devread (int sector, int byte_offset, int byte_len, char *buf) 52 { 53 char sec_buf[SECTOR_SIZE]; 54 unsigned block_len; 55 /* 56 unsigned len = byte_len; 57 u8 *start = buf; 58 */ 59 /* 60 * Check partition boundaries 61 */ 62 if (sector < 0 63 || ((sector + ((byte_offset + byte_len - 1) >> SECTOR_BITS)) 64 >= part_info.size)) { 65 /* errnum = ERR_OUTSIDE_PART; */ 66 printf (" ** reiserfs_devread() read outside partition\n"); 67 return 0; 68 } 69 70 /* 71 * Get the read to the beginning of a partition. 72 */ 73 sector += byte_offset >> SECTOR_BITS; 74 byte_offset &= SECTOR_SIZE - 1; 75 76 #if defined(DEBUG) 77 printf (" <%d, %d, %d> ", sector, byte_offset, byte_len); 78 #endif 79 80 81 if (reiserfs_block_dev_desc == NULL) 82 return 0; 83 84 85 if (byte_offset != 0) { 86 /* read first part which isn't aligned with start of sector */ 87 if (reiserfs_block_dev_desc->block_read(reiserfs_block_dev_desc->dev, 88 part_info.start+sector, 1, (unsigned long *)sec_buf) != 1) { 89 printf (" ** reiserfs_devread() read error\n"); 90 return 0; 91 } 92 memcpy(buf, sec_buf+byte_offset, min(SECTOR_SIZE-byte_offset, byte_len)); 93 buf+=min(SECTOR_SIZE-byte_offset, byte_len); 94 byte_len-=min(SECTOR_SIZE-byte_offset, byte_len); 95 sector++; 96 } 97 98 /* read sector aligned part */ 99 block_len = byte_len & ~(SECTOR_SIZE-1); 100 if (reiserfs_block_dev_desc->block_read(reiserfs_block_dev_desc->dev, 101 part_info.start+sector, block_len/SECTOR_SIZE, (unsigned long *)buf) != 102 block_len/SECTOR_SIZE) { 103 printf (" ** reiserfs_devread() read error - block\n"); 104 return 0; 105 } 106 buf+=block_len; 107 byte_len-=block_len; 108 sector+= block_len/SECTOR_SIZE; 109 110 if ( byte_len != 0 ) { 111 /* read rest of data which are not in whole sector */ 112 if (reiserfs_block_dev_desc->block_read(reiserfs_block_dev_desc->dev, 113 part_info.start+sector, 1, (unsigned long *)sec_buf) != 1) { 114 printf (" ** reiserfs_devread() read error - last part\n"); 115 return 0; 116 } 117 memcpy(buf, sec_buf, byte_len); 118 } 119 120 return 1; 121 } 122 123 #endif /* CFG_CMD_REISERFS */ 124