The ext4 implementation has been taken from U-Boot with some changes: - No global variables to allow for multiple filesystems to be mounted and multiple files to be open. - remove fs internal link following and use the barebox link implementation. - remove write support. This is incomplete in U-Boot, so I decided to skip this for now. Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
154 lines
4.1 KiB
C
154 lines
4.1 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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* ext4ls and ext4load : Based on ext2 ls and load support in Uboot.
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* Ext4 read optimization taken from Open-Moko
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* Qi bootloader
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*
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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 from grub2 fs/ext2.c and fs/fshelp.c by
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2003, 2004 Free Software Foundation, Inc.
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*
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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#include <common.h>
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#include <malloc.h>
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#include <linux/stat.h>
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#include <linux/time.h>
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#include <asm/byteorder.h>
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#include "ext4_common.h"
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void ext4fs_free_node(struct ext2fs_node *node, struct ext2fs_node *currroot)
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{
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if ((node != &node->data->diropen) && (node != currroot))
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free(node);
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}
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/*
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* Taken from openmoko-kernel mailing list: By Andy green
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* Optimized read file API : collects and defers contiguous sector
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* reads into one potentially more efficient larger sequential read action
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*/
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int ext4fs_read_file(struct ext2fs_node *node, int pos,
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unsigned int len, char *buf)
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{
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int i;
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int blockcnt;
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int log2blocksize = LOG2_EXT2_BLOCK_SIZE(node->data);
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int blocksize = 1 << (log2blocksize + DISK_SECTOR_BITS);
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unsigned int filesize = __le32_to_cpu(node->inode.size);
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int previous_block_number = -1;
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int delayed_start = 0;
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int delayed_extent = 0;
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int delayed_skipfirst = 0;
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int delayed_next = 0;
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char *delayed_buf = NULL;
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short ret;
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struct ext_filesystem *fs = node->data->fs;
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/* Adjust len so it we can't read past the end of the file. */
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if (len > filesize)
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len = filesize;
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blockcnt = ((len + pos) + blocksize - 1) / blocksize;
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for (i = pos / blocksize; i < blockcnt; i++) {
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int blknr;
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int blockoff = pos % blocksize;
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int blockend = blocksize;
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int skipfirst = 0;
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blknr = read_allocated_block(node, i);
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if (blknr < 0)
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return blknr;
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blknr = blknr << log2blocksize;
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/* Last block. */
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if (i == blockcnt - 1) {
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blockend = (len + pos) % blocksize;
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/* The last portion is exactly blocksize. */
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if (!blockend)
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blockend = blocksize;
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}
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/* First block. */
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if (i == pos / blocksize) {
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skipfirst = blockoff;
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blockend -= skipfirst;
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}
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if (blknr) {
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if (previous_block_number != -1) {
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if (delayed_next == blknr) {
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delayed_extent += blockend;
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delayed_next += blockend >> SECTOR_BITS;
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} else { /* spill */
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ret = ext4fs_devread(fs, delayed_start,
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delayed_skipfirst,
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delayed_extent,
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delayed_buf);
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if (ret)
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return ret;
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previous_block_number = blknr;
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delayed_start = blknr;
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delayed_extent = blockend;
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delayed_skipfirst = skipfirst;
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delayed_buf = buf;
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delayed_next = blknr +
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(blockend >> SECTOR_BITS);
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}
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} else {
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previous_block_number = blknr;
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delayed_start = blknr;
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delayed_extent = blockend;
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delayed_skipfirst = skipfirst;
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delayed_buf = buf;
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delayed_next = blknr +
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(blockend >> SECTOR_BITS);
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}
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} else {
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if (previous_block_number != -1) {
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/* spill */
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ret = ext4fs_devread(fs, delayed_start,
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delayed_skipfirst,
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delayed_extent,
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delayed_buf);
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if (ret)
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return ret;
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previous_block_number = -1;
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}
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memset(buf, 0, blocksize - skipfirst);
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}
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buf += blocksize - skipfirst;
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}
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if (previous_block_number != -1) {
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/* spill */
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ret = ext4fs_devread(fs, delayed_start,
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delayed_skipfirst, delayed_extent,
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delayed_buf);
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if (ret)
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return ret;
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previous_block_number = -1;
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}
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return len;
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}
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