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"Das U-Boot" Source Tree
1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * (C) Copyright 2011 - 2012 Samsung Electronics
4 * EXT4 filesystem implementation in Uboot by
5 * Uma Shankar <uma.shankar@samsung.com>
6 * Manjunatha C Achar <a.manjunatha@samsung.com>
7 *
8 * made from existing ext2/dev.c file of Uboot
9 * (C) Copyright 2004
10 * esd gmbh <www.esd-electronics.com>
11 * Reinhard Arlt <reinhard.arlt@esd-electronics.com>
12 *
13 * based on code of fs/reiserfs/dev.c by
14 *
15 * (C) Copyright 2003 - 2004
16 * Sysgo AG, <www.elinos.com>, Pavel Bartusek <pba@sysgo.com>
17 */
18
19/*
20 * Changelog:
21 * 0.1 - Newly created file for ext4fs support. Taken from
22 * fs/ext2/dev.c file in uboot.
23 */
24
25#include <blk.h>
26#include <config.h>
27#include <fs_internal.h>
28#include <ext4fs.h>
29#include <ext_common.h>
30#include "ext4_common.h"
31#include <log.h>
32
33lbaint_t part_offset;
34
35static struct blk_desc *ext4fs_blk_desc;
36static struct disk_partition *part_info;
37
38void ext4fs_set_blk_dev(struct blk_desc *rbdd, struct disk_partition *info)
39{
40 assert(rbdd->blksz == (1 << rbdd->log2blksz));
41 ext4fs_blk_desc = rbdd;
42 get_fs()->dev_desc = rbdd;
43 part_info = info;
44 part_offset = info->start;
45 get_fs()->total_sect = ((uint64_t)info->size * info->blksz) >>
46 get_fs()->dev_desc->log2blksz;
47}
48
49int ext4fs_devread(lbaint_t sector, int byte_offset, int byte_len,
50 char *buffer)
51{
52 return fs_devread(get_fs()->dev_desc, part_info, sector, byte_offset,
53 byte_len, buffer);
54}
55
56int ext4_read_superblock(char *buffer)
57{
58 struct ext_filesystem *fs = get_fs();
59 int sect = SUPERBLOCK_START >> fs->dev_desc->log2blksz;
60 int off = SUPERBLOCK_START % fs->dev_desc->blksz;
61
62 return ext4fs_devread(sect, off, SUPERBLOCK_SIZE,
63 buffer);
64}