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a1f41f1a55
The device block descriptor (block_dev_desc_t) )shall be stored at ext4 early code (at ext4fs_set_blk_dev in this case) to be available for latter use (like put_ext4()). Signed-off-by: Lukasz Majewski <l.majewski@samsung.com> Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
141 lines
4.0 KiB
C
141 lines
4.0 KiB
C
/*
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* (C) Copyright 2011 - 2012 Samsung Electronics
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* EXT4 filesystem implementation in Uboot by
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* Uma Shankar <uma.shankar@samsung.com>
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* Manjunatha C Achar <a.manjunatha@samsung.com>
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*
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* made from existing ext2/dev.c file of Uboot
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* (C) Copyright 2004
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* esd gmbh <www.esd-electronics.com>
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* Reinhard Arlt <reinhard.arlt@esd-electronics.com>
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*
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* based on code of fs/reiserfs/dev.c by
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*
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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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*/
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/*
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* Changelog:
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* 0.1 - Newly created file for ext4fs support. Taken from
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* fs/ext2/dev.c file in uboot.
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*/
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#include <common.h>
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#include <config.h>
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#include <ext4fs.h>
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#include <ext_common.h>
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unsigned long part_offset;
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static block_dev_desc_t *ext4fs_block_dev_desc;
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static disk_partition_t *part_info;
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void ext4fs_set_blk_dev(block_dev_desc_t *rbdd, disk_partition_t *info)
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{
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ext4fs_block_dev_desc = rbdd;
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part_info = info;
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part_offset = info->start;
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get_fs()->total_sect = (info->size * info->blksz) / SECTOR_SIZE;
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get_fs()->dev_desc = rbdd;
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}
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int ext4fs_devread(int sector, int byte_offset, int byte_len, char *buf)
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{
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ALLOC_CACHE_ALIGN_BUFFER(char, sec_buf, SECTOR_SIZE);
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unsigned block_len;
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/* Check partition boundaries */
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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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printf("%s read outside partition %d\n", __func__, sector);
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return 0;
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}
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/* Get the read to the beginning of a partition */
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sector += byte_offset >> SECTOR_BITS;
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byte_offset &= SECTOR_SIZE - 1;
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debug(" <%d, %d, %d>\n", sector, byte_offset, byte_len);
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if (ext4fs_block_dev_desc == NULL) {
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printf("** Invalid Block Device Descriptor (NULL)\n");
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return 0;
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}
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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 (ext4fs_block_dev_desc->
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block_read(ext4fs_block_dev_desc->dev,
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part_info->start + sector, 1,
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(unsigned long *) sec_buf) != 1) {
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printf(" ** ext2fs_devread() read error **\n");
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return 0;
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}
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memcpy(buf, sec_buf + byte_offset,
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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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if (byte_len == 0)
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return 1;
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/* read sector aligned part */
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block_len = byte_len & ~(SECTOR_SIZE - 1);
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if (block_len == 0) {
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ALLOC_CACHE_ALIGN_BUFFER(u8, p, SECTOR_SIZE);
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block_len = SECTOR_SIZE;
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ext4fs_block_dev_desc->block_read(ext4fs_block_dev_desc->dev,
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part_info->start + sector,
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1, (unsigned long *)p);
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memcpy(buf, p, byte_len);
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return 1;
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}
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if (ext4fs_block_dev_desc->block_read(ext4fs_block_dev_desc->dev,
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part_info->start + sector,
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block_len / SECTOR_SIZE,
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(unsigned long *) buf) !=
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block_len / SECTOR_SIZE) {
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printf(" ** %s read error - block\n", __func__);
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return 0;
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}
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block_len = byte_len & ~(SECTOR_SIZE - 1);
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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 (ext4fs_block_dev_desc->
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block_read(ext4fs_block_dev_desc->dev,
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part_info->start + sector, 1,
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(unsigned long *) sec_buf) != 1) {
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printf("* %s read error - last part\n", __func__);
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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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