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 * made from existing ext2/dev.c file of Uboot
9 * esd gmbh <www.esd-electronics.com>
10 * Reinhard Arlt <reinhard.arlt@esd-electronics.com>
12 * based on code of fs/reiserfs/dev.c by
14 * (C) Copyright 2003 - 2004
15 * Sysgo AG, <www.elinos.com>, Pavel Bartusek <pba@sysgo.com>
17 * SPDX-License-Identifier: GPL-2.0+
22 * 0.1 - Newly created file for ext4fs support. Taken from
23 * fs/ext2/dev.c file in uboot.
31 #include <ext_common.h>
32 #include "ext4_common.h"
36 static struct blk_desc *ext4fs_blk_desc;
37 static disk_partition_t *part_info;
39 void ext4fs_set_blk_dev(struct blk_desc *rbdd, disk_partition_t *info)
41 assert(rbdd->blksz == (1 << rbdd->log2blksz));
42 ext4fs_blk_desc = rbdd;
43 get_fs()->dev_desc = rbdd;
45 part_offset = info->start;
46 get_fs()->total_sect = ((uint64_t)info->size * info->blksz) >>
47 get_fs()->dev_desc->log2blksz;
50 int ext4fs_devread(lbaint_t sector, int byte_offset, int byte_len, char *buf)
53 int log2blksz = ext4fs_blk_desc->log2blksz;
54 ALLOC_CACHE_ALIGN_BUFFER(char, sec_buf, (ext4fs_blk_desc ?
55 ext4fs_blk_desc->blksz :
57 if (ext4fs_blk_desc == NULL) {
58 printf("** Invalid Block Device Descriptor (NULL)\n");
62 /* Check partition boundaries */
64 ((sector + ((byte_offset + byte_len - 1) >> log2blksz))
65 >= part_info->size)) {
66 printf("%s read outside partition " LBAFU "\n", __func__,
71 /* Get the read to the beginning of a partition */
72 sector += byte_offset >> log2blksz;
73 byte_offset &= ext4fs_blk_desc->blksz - 1;
75 debug(" <" LBAFU ", %d, %d>\n", sector, byte_offset, byte_len);
77 if (byte_offset != 0) {
79 /* read first part which isn't aligned with start of sector */
80 if (blk_dread(ext4fs_blk_desc, part_info->start + sector, 1,
81 (void *)sec_buf) != 1) {
82 printf(" ** ext2fs_devread() read error **\n");
85 readlen = min((int)ext4fs_blk_desc->blksz - byte_offset,
87 memcpy(buf, sec_buf + byte_offset, readlen);
96 /* read sector aligned part */
97 block_len = byte_len & ~(ext4fs_blk_desc->blksz - 1);
100 ALLOC_CACHE_ALIGN_BUFFER(u8, p, ext4fs_blk_desc->blksz);
102 block_len = ext4fs_blk_desc->blksz;
103 blk_dread(ext4fs_blk_desc, part_info->start + sector, 1,
105 memcpy(buf, p, byte_len);
109 if (blk_dread(ext4fs_blk_desc, part_info->start + sector,
110 block_len >> log2blksz, (void *)buf) !=
111 block_len >> log2blksz) {
112 printf(" ** %s read error - block\n", __func__);
115 block_len = byte_len & ~(ext4fs_blk_desc->blksz - 1);
117 byte_len -= block_len;
118 sector += block_len / ext4fs_blk_desc->blksz;
121 /* read rest of data which are not in whole sector */
122 if (blk_dread(ext4fs_blk_desc, part_info->start + sector, 1,
123 (void *)sec_buf) != 1) {
124 printf("* %s read error - last part\n", __func__);
127 memcpy(buf, sec_buf, byte_len);
132 int ext4_read_superblock(char *buffer)
134 struct ext_filesystem *fs = get_fs();
135 int sect = SUPERBLOCK_START >> fs->dev_desc->log2blksz;
136 int off = SUPERBLOCK_START % fs->dev_desc->blksz;
138 return ext4fs_devread(sect, off, SUPERBLOCK_SIZE,