2 * (C) Copyright 2011 - 2012 Samsung Electronics
3 * EXT4 filesystem implementation in Uboot by
7 * ext4ls and ext4load : Based on ext2 ls and load support in Uboot.
8 * Ext4 read optimization taken from Open-Moko
12 * esd gmbh <www.esd-electronics.com>
15 * based on code from grub2 fs/ext2.c and fs/fshelp.c by
16 * GRUB -- GRand Unified Bootloader
17 * Copyright (C) 2003, 2004 Free Software Foundation, Inc.
19 * ext4write : Based on generic ext4 protocol.
21 * SPDX-License-Identifier: GPL-2.0+
25 #include <ext_common.h>
27 #include "ext4_common.h"
30 int ext4fs_symlinknest;
31 struct ext_filesystem ext_fs;
33 struct ext_filesystem *get_fs(void)
38 void ext4fs_free_node(struct ext2fs_node *node, struct ext2fs_node *currroot)
40 if ((node != &ext4fs_root->diropen) && (node != currroot))
45 * Taken from openmoko-kernel mailing list: By Andy green
46 * Optimized read file API : collects and defers contiguous sector
47 * reads into one potentially more efficient larger sequential read action
49 int ext4fs_read_file(struct ext2fs_node *node, loff_t pos,
50 loff_t len, char *buf, loff_t *actread)
52 struct ext_filesystem *fs = get_fs();
55 int log2blksz = fs->dev_desc->log2blksz;
56 int log2_fs_blocksize = LOG2_BLOCK_SIZE(node->data) - log2blksz;
57 int blocksize = (1 << (log2_fs_blocksize + log2blksz));
58 unsigned int filesize = __le32_to_cpu(node->inode.size);
59 lbaint_t previous_block_number = -1;
60 lbaint_t delayed_start = 0;
61 lbaint_t delayed_extent = 0;
62 lbaint_t delayed_skipfirst = 0;
63 lbaint_t delayed_next = 0;
64 char *delayed_buf = NULL;
67 /* Adjust len so it we can't read past the end of the file. */
71 blockcnt = lldiv(((len + pos) + blocksize - 1), blocksize);
73 for (i = lldiv(pos, blocksize); i < blockcnt; i++) {
75 int blockoff = pos - (blocksize * i);
76 int blockend = blocksize;
78 blknr = read_allocated_block(&(node->inode), i);
82 blknr = blknr << log2_fs_blocksize;
85 if (i == blockcnt - 1) {
86 blockend = (len + pos) - (blocksize * i);
88 /* The last portion is exactly blocksize. */
94 if (i == lldiv(pos, blocksize)) {
96 blockend -= skipfirst;
101 if (previous_block_number != -1) {
102 if (delayed_next == blknr) {
103 delayed_extent += blockend;
104 delayed_next += blockend >> log2blksz;
106 status = ext4fs_devread(delayed_start,
112 previous_block_number = blknr;
113 delayed_start = blknr;
114 delayed_extent = blockend;
115 delayed_skipfirst = skipfirst;
117 delayed_next = blknr +
118 (blockend >> log2blksz);
121 previous_block_number = blknr;
122 delayed_start = blknr;
123 delayed_extent = blockend;
124 delayed_skipfirst = skipfirst;
126 delayed_next = blknr +
127 (blockend >> log2blksz);
130 if (previous_block_number != -1) {
132 status = ext4fs_devread(delayed_start,
138 previous_block_number = -1;
140 memset(buf, 0, blocksize - skipfirst);
142 buf += blocksize - skipfirst;
144 if (previous_block_number != -1) {
146 status = ext4fs_devread(delayed_start,
147 delayed_skipfirst, delayed_extent,
151 previous_block_number = -1;
158 int ext4fs_ls(const char *dirname)
160 struct ext2fs_node *dirnode;
166 status = ext4fs_find_file(dirname, &ext4fs_root->diropen, &dirnode,
169 printf("** Can not find directory. **\n");
173 ext4fs_iterate_dir(dirnode, NULL, NULL, NULL);
174 ext4fs_free_node(dirnode, &ext4fs_root->diropen);
179 int ext4fs_exists(const char *filename)
184 ret = ext4fs_open(filename, &file_len);
188 int ext4fs_size(const char *filename, loff_t *size)
190 return ext4fs_open(filename, size);
193 int ext4fs_read(char *buf, loff_t len, loff_t *actread)
195 if (ext4fs_root == NULL || ext4fs_file == NULL)
198 return ext4fs_read_file(ext4fs_file, 0, len, buf, actread);
201 int ext4fs_probe(block_dev_desc_t *fs_dev_desc,
202 disk_partition_t *fs_partition)
204 ext4fs_set_blk_dev(fs_dev_desc, fs_partition);
206 if (!ext4fs_mount(fs_partition->size)) {
214 int ext4_read_file(const char *filename, void *buf, loff_t offset, loff_t len,
221 printf("** Cannot support non-zero offset **\n");
225 ret = ext4fs_open(filename, &file_len);
227 printf("** File not found %s **\n", filename);
234 return ext4fs_read(buf, len, len_read);
237 int ext4fs_uuid(char *uuid_str)
239 if (ext4fs_root == NULL)
242 #ifdef CONFIG_LIB_UUID
243 uuid_bin_to_str((unsigned char *)ext4fs_root->sblock.unique_id,
244 uuid_str, UUID_STR_FORMAT_STD);