dev.c
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/*
* (C) Copyright 2011 - 2012 Samsung Electronics
* EXT4 filesystem implementation in Uboot by
* Uma Shankar <uma.shankar@samsung.com>
* Manjunatha C Achar <a.manjunatha@samsung.com>
*
* made from existing ext2/dev.c file of Uboot
* (C) Copyright 2004
* esd gmbh <www.esd-electronics.com>
* Reinhard Arlt <reinhard.arlt@esd-electronics.com>
*
* based on code of fs/reiserfs/dev.c by
*
* (C) Copyright 2003 - 2004
* Sysgo AG, <www.elinos.com>, Pavel Bartusek <pba@sysgo.com>
*
* SPDX-License-Identifier: GPL-2.0+
*/
/*
* Changelog:
* 0.1 - Newly created file for ext4fs support. Taken from
* fs/ext2/dev.c file in uboot.
*/
#include <common.h>
#include <config.h>
#include <ext4fs.h>
#include <ext_common.h>
#include "ext4_common.h"
lbaint_t part_offset;
static block_dev_desc_t *ext4fs_block_dev_desc;
static disk_partition_t *part_info;
void ext4fs_set_blk_dev(block_dev_desc_t *rbdd, disk_partition_t *info)
{
assert(rbdd->blksz == (1 << rbdd->log2blksz));
ext4fs_block_dev_desc = rbdd;
get_fs()->dev_desc = rbdd;
part_info = info;
part_offset = info->start;
get_fs()->total_sect = ((uint64_t)info->size * info->blksz) >>
get_fs()->dev_desc->log2blksz;
}
int ext4fs_devread(lbaint_t sector, int byte_offset, int byte_len, char *buf)
{
unsigned block_len;
int log2blksz = ext4fs_block_dev_desc->log2blksz;
ALLOC_CACHE_ALIGN_BUFFER(char, sec_buf, (ext4fs_block_dev_desc ?
ext4fs_block_dev_desc->blksz :
0));
if (ext4fs_block_dev_desc == NULL) {
printf("** Invalid Block Device Descriptor (NULL)\n");
return 0;
}
/* Check partition boundaries */
if ((sector < 0) ||
((sector + ((byte_offset + byte_len - 1) >> log2blksz))
>= part_info->size)) {
printf("%s read outside partition " LBAFU "\n", __func__,
sector);
return 0;
}
/* Get the read to the beginning of a partition */
sector += byte_offset >> log2blksz;
byte_offset &= ext4fs_block_dev_desc->blksz - 1;
debug(" <" LBAFU ", %d, %d>\n", sector, byte_offset, byte_len);
if (byte_offset != 0) {
int readlen;
/* read first part which isn't aligned with start of sector */
if (ext4fs_block_dev_desc->
block_read(ext4fs_block_dev_desc->dev,
part_info->start + sector, 1,
(unsigned long *) sec_buf) != 1) {
printf(" ** ext2fs_devread() read error **\n");
return 0;
}
readlen = min((int)ext4fs_block_dev_desc->blksz - byte_offset,
byte_len);
memcpy(buf, sec_buf + byte_offset, readlen);
buf += readlen;
byte_len -= readlen;
sector++;
}
if (byte_len == 0)
return 1;
/* read sector aligned part */
block_len = byte_len & ~(ext4fs_block_dev_desc->blksz - 1);
if (block_len == 0) {
ALLOC_CACHE_ALIGN_BUFFER(u8, p, ext4fs_block_dev_desc->blksz);
block_len = ext4fs_block_dev_desc->blksz;
ext4fs_block_dev_desc->block_read(ext4fs_block_dev_desc->dev,
part_info->start + sector,
1, (unsigned long *)p);
memcpy(buf, p, byte_len);
return 1;
}
if (ext4fs_block_dev_desc->block_read(ext4fs_block_dev_desc->dev,
part_info->start + sector,
block_len >> log2blksz,
(unsigned long *) buf) !=
block_len >> log2blksz) {
printf(" ** %s read error - block\n", __func__);
return 0;
}
block_len = byte_len & ~(ext4fs_block_dev_desc->blksz - 1);
buf += block_len;
byte_len -= block_len;
sector += block_len / ext4fs_block_dev_desc->blksz;
if (byte_len != 0) {
/* read rest of data which are not in whole sector */
if (ext4fs_block_dev_desc->
block_read(ext4fs_block_dev_desc->dev,
part_info->start + sector, 1,
(unsigned long *) sec_buf) != 1) {
printf("* %s read error - last part\n", __func__);
return 0;
}
memcpy(buf, sec_buf, byte_len);
}
return 1;
}
int ext4_read_superblock(char *buffer)
{
struct ext_filesystem *fs = get_fs();
int sect = SUPERBLOCK_START >> fs->dev_desc->log2blksz;
int off = SUPERBLOCK_START % fs->dev_desc->blksz;
return ext4fs_devread(sect, off, SUPERBLOCK_SIZE,
buffer);
}