3 * esd gmbh <www.esd-electronics.com>
4 * Reinhard Arlt <reinhard.arlt@esd-electronics.com>
6 * based on code of fs/reiserfs/dev.c by
8 * (C) Copyright 2003 - 2004
9 * Sysgo AG, <www.elinos.com>, Pavel Bartusek <pba@sysgo.com>
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or
14 * (at your option) any later version.
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
28 #if (CONFIG_COMMANDS & CFG_CMD_EXT2)
33 static block_dev_desc_t *ext2fs_block_dev_desc;
34 static disk_partition_t part_info;
37 int ext2fs_set_blk_dev
39 block_dev_desc_t *rbdd,
43 ext2fs_block_dev_desc = rbdd;
47 /* disk doesn't use partition table */
49 part_info.size = rbdd->lba;
50 part_info.blksz = rbdd->blksz;
54 if (get_partition_info (ext2fs_block_dev_desc, part, &part_info))
59 return (part_info.size);
71 char sec_buf[SECTOR_SIZE];
74 * Check partition boundaries
76 if ((sector < 0) || ((sector + ((byte_offset + byte_len - 1) >> SECTOR_BITS)) >= part_info.size))
78 /* errnum = ERR_OUTSIDE_PART; */
79 printf (" ** ext2fs_devread() read outside partition sector %d\n", sector);
84 * Get the read to the beginning of a partition.
86 sector += byte_offset >> SECTOR_BITS;
87 byte_offset &= SECTOR_SIZE - 1;
90 printf (" <%d, %d, %d>\n", sector, byte_offset, byte_len);
93 if (ext2fs_block_dev_desc == NULL)
95 printf("** Invalid Block Device Descriptor (NULL)\n");
101 /* read first part which isn't aligned with start of sector */
102 if (ext2fs_block_dev_desc->block_read(ext2fs_block_dev_desc->dev, part_info.start+sector, 1, (unsigned long *)sec_buf) != 1)
104 printf (" ** ext2fs_devread() read error **\n");
107 memcpy(buf, sec_buf+byte_offset, min(SECTOR_SIZE-byte_offset, byte_len));
108 buf+=min(SECTOR_SIZE-byte_offset, byte_len);
109 byte_len-=min(SECTOR_SIZE-byte_offset, byte_len);
113 /* read sector aligned part */
114 block_len = byte_len & ~(SECTOR_SIZE-1);
115 if (ext2fs_block_dev_desc->block_read(ext2fs_block_dev_desc->dev,
116 part_info.start+sector,
117 block_len/SECTOR_SIZE,
118 (unsigned long *)buf) != block_len/SECTOR_SIZE)
120 printf (" ** ext2fs_devread() read error - block\n");
125 sector+= block_len/SECTOR_SIZE;
129 /* read rest of data which are not in whole sector */
130 if (ext2fs_block_dev_desc->block_read(ext2fs_block_dev_desc->dev,
131 part_info.start+sector,
133 (unsigned long *)sec_buf) != 1)
135 printf (" ** ext2fs_devread() read error - last part\n");
138 memcpy(buf, sec_buf, byte_len);
142 #endif /* CFG_CMD_EXT2FS */