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;
64 char *start_buf = buf;
66 struct ext_block_cache cache;
68 ext_cache_init(&cache);
70 /* Adjust len so it we can't read past the end of the file. */
71 if (len + pos > filesize)
72 len = (filesize - pos);
74 if (blocksize <= 0 || len <= 0) {
75 ext_cache_fini(&cache);
79 blockcnt = lldiv(((len + pos) + blocksize - 1), blocksize);
81 for (i = lldiv(pos, blocksize); i < blockcnt; i++) {
83 int blockoff = pos - (blocksize * i);
84 int blockend = blocksize;
86 blknr = read_allocated_block(&node->inode, i, &cache);
88 ext_cache_fini(&cache);
92 blknr = blknr << log2_fs_blocksize;
95 if (i == blockcnt - 1) {
96 blockend = (len + pos) - (blocksize * i);
98 /* The last portion is exactly blocksize. */
100 blockend = blocksize;
104 if (i == lldiv(pos, blocksize)) {
105 skipfirst = blockoff;
106 blockend -= skipfirst;
111 if (previous_block_number != -1) {
112 if (delayed_next == blknr) {
113 delayed_extent += blockend;
114 delayed_next += blockend >> log2blksz;
116 status = ext4fs_devread(delayed_start,
121 ext_cache_fini(&cache);
124 previous_block_number = blknr;
125 delayed_start = blknr;
126 delayed_extent = blockend;
127 delayed_skipfirst = skipfirst;
129 delayed_next = blknr +
130 (blockend >> log2blksz);
133 previous_block_number = blknr;
134 delayed_start = blknr;
135 delayed_extent = blockend;
136 delayed_skipfirst = skipfirst;
138 delayed_next = blknr +
139 (blockend >> log2blksz);
144 if (previous_block_number != -1) {
146 status = ext4fs_devread(delayed_start,
151 ext_cache_fini(&cache);
154 previous_block_number = -1;
156 /* Zero no more than `len' bytes. */
157 n = blocksize - skipfirst;
158 n_left = len - ( buf - start_buf );
163 buf += blocksize - skipfirst;
165 if (previous_block_number != -1) {
167 status = ext4fs_devread(delayed_start,
168 delayed_skipfirst, delayed_extent,
171 ext_cache_fini(&cache);
174 previous_block_number = -1;
178 ext_cache_fini(&cache);
182 int ext4fs_ls(const char *dirname)
184 struct ext2fs_node *dirnode = NULL;
190 status = ext4fs_find_file(dirname, &ext4fs_root->diropen, &dirnode,
193 printf("** Can not find directory. **\n");
195 ext4fs_free_node(dirnode, &ext4fs_root->diropen);
199 ext4fs_iterate_dir(dirnode, NULL, NULL, NULL);
200 ext4fs_free_node(dirnode, &ext4fs_root->diropen);
205 int ext4fs_exists(const char *filename)
210 ret = ext4fs_open(filename, &file_len);
214 int ext4fs_size(const char *filename, loff_t *size)
216 return ext4fs_open(filename, size);
219 int ext4fs_read(char *buf, loff_t offset, loff_t len, loff_t *actread)
221 if (ext4fs_root == NULL || ext4fs_file == NULL)
224 return ext4fs_read_file(ext4fs_file, offset, len, buf, actread);
227 int ext4fs_probe(struct blk_desc *fs_dev_desc,
228 disk_partition_t *fs_partition)
230 ext4fs_set_blk_dev(fs_dev_desc, fs_partition);
232 if (!ext4fs_mount(fs_partition->size)) {
240 int ext4_read_file(const char *filename, void *buf, loff_t offset, loff_t len,
246 ret = ext4fs_open(filename, &file_len);
248 printf("** File not found %s **\n", filename);
255 return ext4fs_read(buf, offset, len, len_read);
258 int ext4fs_uuid(char *uuid_str)
260 if (ext4fs_root == NULL)
263 #ifdef CONFIG_LIB_UUID
264 uuid_bin_to_str((unsigned char *)ext4fs_root->sblock.unique_id,
265 uuid_str, UUID_STR_FORMAT_STD);
273 void ext_cache_init(struct ext_block_cache *cache)
275 memset(cache, 0, sizeof(*cache));
278 void ext_cache_fini(struct ext_block_cache *cache)
281 ext_cache_init(cache);
284 int ext_cache_read(struct ext_block_cache *cache, lbaint_t block, int size)
286 /* This could be more lenient, but this is simple and enough for now */
287 if (cache->buf && cache->block == block && cache->size == size)
289 ext_cache_fini(cache);
290 cache->buf = malloc(size);
293 if (!ext4fs_devread(block, 0, size, cache->buf)) {
294 ext_cache_fini(cache);
297 cache->block = block;