LXR uboot/fs/ext4/dev.c

   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 <common.h>
  26#include <blk.h>
  27#include <config.h>
  28#include <fs_internal.h>
  29#include <ext4fs.h>
  30#include <ext_common.h>
  31#include "ext4_common.h"
  32#include <log.h>
  33
  34lbaint_t part_offset;
  35
  36static struct blk_desc *ext4fs_blk_desc;
  37static struct disk_partition *part_info;
  38
  39void ext4fs_set_blk_dev(struct blk_desc *rbdd, struct disk_partition *info)
  40{
  41        assert(rbdd->blksz == (1 << rbdd->log2blksz));
  42        ext4fs_blk_desc = rbdd;
  43        get_fs()->dev_desc = rbdd;
  44        part_info = info;
  45        part_offset = info->start;
  46        get_fs()->total_sect = ((uint64_t)info->size * info->blksz) >>
  47                get_fs()->dev_desc->log2blksz;
  48}
  49
  50int ext4fs_devread(lbaint_t sector, int byte_offset, int byte_len,
  51                   char *buffer)
  52{
  53        return fs_devread(get_fs()->dev_desc, part_info, sector, byte_offset,
  54                          byte_len, buffer);
  55}
  56
  57int ext4_read_superblock(char *buffer)
  58{
  59        struct ext_filesystem *fs = get_fs();
  60        int sect = SUPERBLOCK_START >> fs->dev_desc->log2blksz;
  61        int off = SUPERBLOCK_START % fs->dev_desc->blksz;
  62
  63        return ext4fs_devread(sect, off, SUPERBLOCK_SIZE,
  64                                buffer);
  65}
  66