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![Tom Rini](/assets/img/avatar_default.png)
When U-Boot started using SPDX tags we were among the early adopters and there weren't a lot of other examples to borrow from. So we picked the area of the file that usually had a full license text and replaced it with an appropriate SPDX-License-Identifier: entry. Since then, the Linux Kernel has adopted SPDX tags and they place it as the very first line in a file (except where shebangs are used, then it's second line) and with slightly different comment styles than us. In part due to community overlap, in part due to better tag visibility and in part for other minor reasons, switch over to that style. This commit changes all instances where we have a single declared license in the tag as both the before and after are identical in tag contents. There's also a few places where I found we did not have a tag and have introduced one. Signed-off-by: Tom Rini <trini@konsulko.com>
254 lines
5.7 KiB
C
254 lines
5.7 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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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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#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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#include <div64.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, loff_t pos,
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loff_t len, char *buf, loff_t *actread)
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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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if (blocksize <= 0)
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return -1;
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/* Adjust len so it we can't read past the end of the file. */
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if (len + pos > filesize)
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len = (filesize - pos);
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blockcnt = lldiv(((len + pos) + blocksize - 1), blocksize);
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for (i = lldiv(pos, blocksize); i < blockcnt; i++) {
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long int blknr;
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int blockoff = pos - (blocksize * i);
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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 * i);
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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 == lldiv(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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int n;
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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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/* Zero no more than `len' bytes. */
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n = blocksize - skipfirst;
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if (n > len)
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n = len;
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memset(buf, 0, n);
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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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*actread = len;
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return 0;
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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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ext4fs_free_node(dirnode, &ext4fs_root->diropen);
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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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loff_t file_len;
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int ret;
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ret = ext4fs_open(filename, &file_len);
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return ret == 0;
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}
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int ext4fs_size(const char *filename, loff_t *size)
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{
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return ext4fs_open(filename, size);
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}
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int ext4fs_read(char *buf, loff_t offset, loff_t len, loff_t *actread)
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{
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if (ext4fs_root == NULL || ext4fs_file == NULL)
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return -1;
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return ext4fs_read_file(ext4fs_file, offset, len, buf, actread);
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}
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int ext4fs_probe(struct blk_desc *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, loff_t offset, loff_t len,
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loff_t *len_read)
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{
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loff_t file_len;
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int ret;
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ret = ext4fs_open(filename, &file_len);
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if (ret < 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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return ext4fs_read(buf, offset, len, len_read);
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}
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int ext4fs_uuid(char *uuid_str)
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{
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if (ext4fs_root == NULL)
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return -1;
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#ifdef CONFIG_LIB_UUID
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uuid_bin_to_str((unsigned char *)ext4fs_root->sblock.unique_id,
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uuid_str, UUID_STR_FORMAT_STD);
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return 0;
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#else
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return -ENOSYS;
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#endif
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}
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