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
  33 lbaint_t part_offset;
  34
  35 static struct blk_desc *ext4fs_blk_desc;
  36 static disk_partition_t *part_info;
  37
  38 void ext4fs_set_blk_dev(struct blk_desc *rbdd, disk_partition_t *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
  49 int 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
  56 int 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 }