147 lines
3.9 KiB
C
147 lines
3.9 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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* SPDX-License-Identifier: GPL-2.0+
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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 <memalign.h>
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#include <ext4fs.h>
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#include <ext_common.h>
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#include "ext4_common.h"
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lbaint_t 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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assert(rbdd->blksz == (1 << rbdd->log2blksz));
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ext4fs_block_dev_desc = rbdd;
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get_fs()->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 = ((uint64_t)info->size * info->blksz) >>
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get_fs()->dev_desc->log2blksz;
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}
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int ext4fs_devread(lbaint_t sector, int byte_offset, int byte_len, char *buf)
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{
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unsigned block_len;
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int log2blksz = ext4fs_block_dev_desc->log2blksz;
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ALLOC_CACHE_ALIGN_BUFFER(char, sec_buf, (ext4fs_block_dev_desc ?
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ext4fs_block_dev_desc->blksz :
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0));
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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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/* Check partition boundaries */
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if ((sector < 0) ||
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((sector + ((byte_offset + byte_len - 1) >> log2blksz))
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>= part_info->size)) {
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printf("%s read outside partition " LBAFU "\n", __func__,
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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 >> log2blksz;
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byte_offset &= ext4fs_block_dev_desc->blksz - 1;
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debug(" <" LBAFU ", %d, %d>\n", sector, byte_offset, byte_len);
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if (byte_offset != 0) {
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int readlen;
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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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readlen = min((int)ext4fs_block_dev_desc->blksz - byte_offset,
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byte_len);
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memcpy(buf, sec_buf + byte_offset, readlen);
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buf += readlen;
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byte_len -= readlen;
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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 & ~(ext4fs_block_dev_desc->blksz - 1);
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if (block_len == 0) {
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ALLOC_CACHE_ALIGN_BUFFER(u8, p, ext4fs_block_dev_desc->blksz);
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block_len = ext4fs_block_dev_desc->blksz;
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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 >> log2blksz,
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(unsigned long *) buf) !=
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block_len >> log2blksz) {
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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 & ~(ext4fs_block_dev_desc->blksz - 1);
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buf += block_len;
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byte_len -= block_len;
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sector += block_len / ext4fs_block_dev_desc->blksz;
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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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int ext4_read_superblock(char *buffer)
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{
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struct ext_filesystem *fs = get_fs();
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int sect = SUPERBLOCK_START >> fs->dev_desc->log2blksz;
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int off = SUPERBLOCK_START % fs->dev_desc->blksz;
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return ext4fs_devread(sect, off, SUPERBLOCK_SIZE,
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buffer);
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}
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