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![Tom Rini](/assets/img/avatar_default.png)
This reverts commit fc0fc50f38
.
The author has asked on the mailing list that we revert this for now as
it breaks write support.
Reported-by: Łukasz Majewski <l.majewski@samsung.com>
Signed-off-by: Tom Rini <trini@ti.com>
229 lines
5.1 KiB
C
229 lines
5.1 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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* ext4write : Based on generic ext4 protocol.
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <common.h>
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#include <ext_common.h>
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#include <ext4fs.h>
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#include "ext4_common.h"
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int ext4fs_symlinknest;
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struct ext_filesystem ext_fs;
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struct ext_filesystem *get_fs(void)
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{
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return &ext_fs;
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}
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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 != &ext4fs_root->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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struct ext_filesystem *fs = get_fs();
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int i;
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lbaint_t blockcnt;
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int log2blksz = fs->dev_desc->log2blksz;
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int log2_fs_blocksize = LOG2_BLOCK_SIZE(node->data) - log2blksz;
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int blocksize = (1 << (log2_fs_blocksize + log2blksz));
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unsigned int filesize = __le32_to_cpu(node->inode.size);
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lbaint_t previous_block_number = -1;
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lbaint_t delayed_start = 0;
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lbaint_t delayed_extent = 0;
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lbaint_t delayed_skipfirst = 0;
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lbaint_t delayed_next = 0;
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char *delayed_buf = NULL;
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short status;
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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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lbaint_t 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->inode), i);
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if (blknr < 0)
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return -1;
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blknr = blknr << log2_fs_blocksize;
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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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int status;
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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 >> log2blksz;
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} else { /* spill */
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status = ext4fs_devread(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 (status == 0)
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return -1;
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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 >> log2blksz);
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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 >> log2blksz);
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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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status = ext4fs_devread(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 (status == 0)
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return -1;
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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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status = ext4fs_devread(delayed_start,
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delayed_skipfirst, delayed_extent,
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delayed_buf);
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if (status == 0)
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return -1;
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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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int ext4fs_ls(const char *dirname)
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{
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struct ext2fs_node *dirnode;
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int status;
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if (dirname == NULL)
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return 0;
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status = ext4fs_find_file(dirname, &ext4fs_root->diropen, &dirnode,
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FILETYPE_DIRECTORY);
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if (status != 1) {
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printf("** Can not find directory. **\n");
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return 1;
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}
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ext4fs_iterate_dir(dirnode, NULL, NULL, NULL);
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ext4fs_free_node(dirnode, &ext4fs_root->diropen);
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return 0;
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}
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int ext4fs_exists(const char *filename)
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{
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int file_len;
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file_len = ext4fs_open(filename);
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return file_len >= 0;
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}
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int ext4fs_read(char *buf, unsigned len)
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{
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if (ext4fs_root == NULL || ext4fs_file == NULL)
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return 0;
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return ext4fs_read_file(ext4fs_file, 0, len, buf);
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}
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int ext4fs_probe(block_dev_desc_t *fs_dev_desc,
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disk_partition_t *fs_partition)
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{
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ext4fs_set_blk_dev(fs_dev_desc, fs_partition);
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if (!ext4fs_mount(fs_partition->size)) {
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ext4fs_close();
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return -1;
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}
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return 0;
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}
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int ext4_read_file(const char *filename, void *buf, int offset, int len)
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{
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int file_len;
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int len_read;
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if (offset != 0) {
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printf("** Cannot support non-zero offset **\n");
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return -1;
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}
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file_len = ext4fs_open(filename);
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if (file_len < 0) {
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printf("** File not found %s **\n", filename);
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return -1;
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}
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if (len == 0)
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len = file_len;
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len_read = ext4fs_read(buf, len);
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return len_read;
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}
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