2 * (C) Copyright 2011 - 2012 Samsung Electronics
3 * EXT4 filesystem implementation in Uboot by
4 * Uma Shankar <uma.shankar@samsung.com>
5 * Manjunatha C Achar <a.manjunatha@samsung.com>
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>
13 * Reinhard Arlt <reinhard.arlt@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"
29 int ext4fs_symlinknest;
30 struct ext_filesystem ext_fs;
32 struct ext_filesystem *get_fs(void)
37 void ext4fs_free_node(struct ext2fs_node *node, struct ext2fs_node *currroot)
39 if ((node != &ext4fs_root->diropen) && (node != currroot))
44 * Taken from openmoko-kernel mailing list: By Andy green
45 * Optimized read file API : collects and defers contiguous sector
46 * reads into one potentially more efficient larger sequential read action
48 int ext4fs_read_file(struct ext2fs_node *node, loff_t pos,
49 loff_t len, char *buf, loff_t *actread)
51 struct ext_filesystem *fs = get_fs();
54 int log2blksz = fs->dev_desc->log2blksz;
55 int log2_fs_blocksize = LOG2_BLOCK_SIZE(node->data) - log2blksz;
56 int blocksize = (1 << (log2_fs_blocksize + log2blksz));
57 unsigned int filesize = __le32_to_cpu(node->inode.size);
58 lbaint_t previous_block_number = -1;
59 lbaint_t delayed_start = 0;
60 lbaint_t delayed_extent = 0;
61 lbaint_t delayed_skipfirst = 0;
62 lbaint_t delayed_next = 0;
63 char *delayed_buf = NULL;
66 /* Adjust len so it we can't read past the end of the file. */
70 blockcnt = ((len + pos) + blocksize - 1) / blocksize;
72 for (i = pos / blocksize; i < blockcnt; i++) {
74 int blockoff = pos % blocksize;
75 int blockend = blocksize;
77 blknr = read_allocated_block(&(node->inode), i);
81 blknr = blknr << log2_fs_blocksize;
84 if (i == blockcnt - 1) {
85 blockend = (len + pos) % blocksize;
87 /* The last portion is exactly blocksize. */
93 if (i == pos / blocksize) {
95 blockend -= skipfirst;
100 if (previous_block_number != -1) {
101 if (delayed_next == blknr) {
102 delayed_extent += blockend;
103 delayed_next += blockend >> log2blksz;
105 status = ext4fs_devread(delayed_start,
111 previous_block_number = blknr;
112 delayed_start = blknr;
113 delayed_extent = blockend;
114 delayed_skipfirst = skipfirst;
116 delayed_next = blknr +
117 (blockend >> log2blksz);
120 previous_block_number = blknr;
121 delayed_start = blknr;
122 delayed_extent = blockend;
123 delayed_skipfirst = skipfirst;
125 delayed_next = blknr +
126 (blockend >> log2blksz);
129 if (previous_block_number != -1) {
131 status = ext4fs_devread(delayed_start,
137 previous_block_number = -1;
139 memset(buf, 0, blocksize - skipfirst);
141 buf += blocksize - skipfirst;
143 if (previous_block_number != -1) {
145 status = ext4fs_devread(delayed_start,
146 delayed_skipfirst, delayed_extent,
150 previous_block_number = -1;
157 int ext4fs_ls(const char *dirname)
159 struct ext2fs_node *dirnode;
165 status = ext4fs_find_file(dirname, &ext4fs_root->diropen, &dirnode,
168 printf("** Can not find directory. **\n");
172 ext4fs_iterate_dir(dirnode, NULL, NULL, NULL);
173 ext4fs_free_node(dirnode, &ext4fs_root->diropen);
178 int ext4fs_exists(const char *filename)
183 ret = ext4fs_open(filename, &file_len);
187 int ext4fs_size(const char *filename)
192 ret = ext4fs_open(filename, &size);
199 int ext4fs_read(char *buf, loff_t len, loff_t *actread)
201 if (ext4fs_root == NULL || ext4fs_file == NULL)
204 return ext4fs_read_file(ext4fs_file, 0, len, buf, actread);
207 int ext4fs_probe(block_dev_desc_t *fs_dev_desc,
208 disk_partition_t *fs_partition)
210 ext4fs_set_blk_dev(fs_dev_desc, fs_partition);
212 if (!ext4fs_mount(fs_partition->size)) {
220 int ext4_read_file(const char *filename, void *buf, int offset, int len)
227 printf("** Cannot support non-zero offset **\n");
231 ret = ext4fs_open(filename, &file_len);
233 printf("** File not found %s **\n", filename);
240 ret = ext4fs_read(buf, len, &len_read);
248 int ext4fs_uuid(char *uuid_str)
250 if (ext4fs_root == NULL)
253 #ifdef CONFIG_LIB_UUID
254 uuid_bin_to_str((unsigned char *)ext4fs_root->sblock.unique_id,
255 uuid_str, UUID_STR_FORMAT_STD);