mirror of
https://github.com/AsahiLinux/u-boot
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2a981dc2c6
To ease conversion to driver model, add helper functions which deal with calling each block device method. With driver model we can reimplement these functions with the same arguments. Use inline functions to avoid increasing code size on some boards. Signed-off-by: Simon Glass <sjg@chromium.org> Reviewed-by: Bin Meng <bmeng.cn@gmail.com> Tested-by: Stephen Warren <swarren@nvidia.com>
140 lines
3.6 KiB
C
140 lines
3.6 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 <blk.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 struct blk_desc *ext4fs_blk_desc;
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static disk_partition_t *part_info;
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void ext4fs_set_blk_dev(struct blk_desc *rbdd, disk_partition_t *info)
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{
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assert(rbdd->blksz == (1 << rbdd->log2blksz));
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ext4fs_blk_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_blk_desc->log2blksz;
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ALLOC_CACHE_ALIGN_BUFFER(char, sec_buf, (ext4fs_blk_desc ?
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ext4fs_blk_desc->blksz :
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0));
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if (ext4fs_blk_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_blk_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 (blk_dread(ext4fs_blk_desc, part_info->start + sector, 1,
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(void *)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_blk_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_blk_desc->blksz - 1);
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if (block_len == 0) {
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ALLOC_CACHE_ALIGN_BUFFER(u8, p, ext4fs_blk_desc->blksz);
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block_len = ext4fs_blk_desc->blksz;
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blk_dread(ext4fs_blk_desc, part_info->start + sector, 1,
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(void *)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 (blk_dread(ext4fs_blk_desc, part_info->start + sector,
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block_len >> log2blksz, (void *)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_blk_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_blk_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 (blk_dread(ext4fs_blk_desc, part_info->start + sector, 1,
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(void *)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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