1 // SPDX-License-Identifier: GPL-2.0+
3 * (C) Copyright 2011 - 2012 Samsung Electronics
4 * EXT4 filesystem implementation in Uboot by
5 * Uma Shankar <uma.shankar@samsung.com>
6 * Manjunatha C Achar <a.manjunatha@samsung.com>
8 * ext4ls and ext4load : Based on ext2 ls and load support in Uboot.
9 * Ext4 read optimization taken from Open-Moko
13 * esd gmbh <www.esd-electronics.com>
14 * Reinhard Arlt <reinhard.arlt@esd-electronics.com>
16 * based on code from grub2 fs/ext2.c and fs/fshelp.c by
17 * GRUB -- GRand Unified Bootloader
18 * Copyright (C) 2003, 2004 Free Software Foundation, Inc.
20 * ext4write : Based on generic ext4 protocol.
24 #include <ext_common.h>
26 #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;
69 /* Adjust len so it we can't read past the end of the file. */
70 if (len + pos > filesize)
71 len = (filesize - pos);
73 blockcnt = lldiv(((len + pos) + blocksize - 1), blocksize);
75 for (i = lldiv(pos, blocksize); i < blockcnt; i++) {
77 int blockoff = pos - (blocksize * i);
78 int blockend = blocksize;
80 blknr = read_allocated_block(&(node->inode), i);
84 blknr = blknr << log2_fs_blocksize;
87 if (i == blockcnt - 1) {
88 blockend = (len + pos) - (blocksize * i);
90 /* The last portion is exactly blocksize. */
96 if (i == lldiv(pos, blocksize)) {
98 blockend -= skipfirst;
103 if (previous_block_number != -1) {
104 if (delayed_next == blknr) {
105 delayed_extent += blockend;
106 delayed_next += blockend >> log2blksz;
108 status = ext4fs_devread(delayed_start,
114 previous_block_number = blknr;
115 delayed_start = blknr;
116 delayed_extent = blockend;
117 delayed_skipfirst = skipfirst;
119 delayed_next = blknr +
120 (blockend >> log2blksz);
123 previous_block_number = blknr;
124 delayed_start = blknr;
125 delayed_extent = blockend;
126 delayed_skipfirst = skipfirst;
128 delayed_next = blknr +
129 (blockend >> log2blksz);
133 if (previous_block_number != -1) {
135 status = ext4fs_devread(delayed_start,
141 previous_block_number = -1;
143 /* Zero no more than `len' bytes. */
144 n = blocksize - skipfirst;
149 buf += blocksize - skipfirst;
151 if (previous_block_number != -1) {
153 status = ext4fs_devread(delayed_start,
154 delayed_skipfirst, delayed_extent,
158 previous_block_number = -1;
165 int ext4fs_ls(const char *dirname)
167 struct ext2fs_node *dirnode;
173 status = ext4fs_find_file(dirname, &ext4fs_root->diropen, &dirnode,
176 printf("** Can not find directory. **\n");
177 ext4fs_free_node(dirnode, &ext4fs_root->diropen);
181 ext4fs_iterate_dir(dirnode, NULL, NULL, NULL);
182 ext4fs_free_node(dirnode, &ext4fs_root->diropen);
187 int ext4fs_exists(const char *filename)
192 ret = ext4fs_open(filename, &file_len);
196 int ext4fs_size(const char *filename, loff_t *size)
198 return ext4fs_open(filename, size);
201 int ext4fs_read(char *buf, loff_t offset, loff_t len, loff_t *actread)
203 if (ext4fs_root == NULL || ext4fs_file == NULL)
206 return ext4fs_read_file(ext4fs_file, offset, len, buf, actread);
209 int ext4fs_probe(struct blk_desc *fs_dev_desc,
210 disk_partition_t *fs_partition)
212 ext4fs_set_blk_dev(fs_dev_desc, fs_partition);
214 if (!ext4fs_mount(fs_partition->size)) {
222 int ext4_read_file(const char *filename, void *buf, loff_t offset, loff_t len,
228 ret = ext4fs_open(filename, &file_len);
230 printf("** File not found %s **\n", filename);
237 return ext4fs_read(buf, offset, len, len_read);
240 int ext4fs_uuid(char *uuid_str)
242 if (ext4fs_root == NULL)
245 #ifdef CONFIG_LIB_UUID
246 uuid_bin_to_str((unsigned char *)ext4fs_root->sblock.unique_id,
247 uuid_str, UUID_STR_FORMAT_STD);