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.
29 #include <ext_common.h>
30 #include "ext4_common.h"
34 static block_dev_desc_t *ext4fs_block_dev_desc;
35 static disk_partition_t *part_info;
37 void ext4fs_set_blk_dev(block_dev_desc_t *rbdd, disk_partition_t *info)
39 assert(rbdd->blksz == (1 << rbdd->log2blksz));
40 ext4fs_block_dev_desc = rbdd;
41 get_fs()->dev_desc = rbdd;
43 part_offset = info->start;
44 get_fs()->total_sect = ((uint64_t)info->size * info->blksz) >>
45 get_fs()->dev_desc->log2blksz;
48 int ext4fs_devread(lbaint_t sector, int byte_offset, int byte_len, char *buf)
51 int log2blksz = ext4fs_block_dev_desc->log2blksz;
52 ALLOC_CACHE_ALIGN_BUFFER(char, sec_buf, (ext4fs_block_dev_desc ?
53 ext4fs_block_dev_desc->blksz :
55 if (ext4fs_block_dev_desc == NULL) {
56 printf("** Invalid Block Device Descriptor (NULL)\n");
60 /* Check partition boundaries */
62 ((sector + ((byte_offset + byte_len - 1) >> log2blksz))
63 >= part_info->size)) {
64 printf("%s read outside partition " LBAFU "\n", __func__,
69 /* Get the read to the beginning of a partition */
70 sector += byte_offset >> log2blksz;
71 byte_offset &= ext4fs_block_dev_desc->blksz - 1;
73 debug(" <" LBAFU ", %d, %d>\n", sector, byte_offset, byte_len);
75 if (byte_offset != 0) {
77 /* read first part which isn't aligned with start of sector */
78 if (ext4fs_block_dev_desc->
79 block_read(ext4fs_block_dev_desc->dev,
80 part_info->start + sector, 1,
81 (unsigned long *) sec_buf) != 1) {
82 printf(" ** ext2fs_devread() read error **\n");
85 readlen = min((int)ext4fs_block_dev_desc->blksz - byte_offset,
87 memcpy(buf, sec_buf + byte_offset, readlen);
96 /* read sector aligned part */
97 block_len = byte_len & ~(ext4fs_block_dev_desc->blksz - 1);
100 ALLOC_CACHE_ALIGN_BUFFER(u8, p, ext4fs_block_dev_desc->blksz);
102 block_len = ext4fs_block_dev_desc->blksz;
103 ext4fs_block_dev_desc->block_read(ext4fs_block_dev_desc->dev,
104 part_info->start + sector,
105 1, (unsigned long *)p);
106 memcpy(buf, p, byte_len);
110 if (ext4fs_block_dev_desc->block_read(ext4fs_block_dev_desc->dev,
111 part_info->start + sector,
112 block_len >> log2blksz,
113 (unsigned long *) buf) !=
114 block_len >> log2blksz) {
115 printf(" ** %s read error - block\n", __func__);
118 block_len = byte_len & ~(ext4fs_block_dev_desc->blksz - 1);
120 byte_len -= block_len;
121 sector += block_len / ext4fs_block_dev_desc->blksz;
124 /* read rest of data which are not in whole sector */
125 if (ext4fs_block_dev_desc->
126 block_read(ext4fs_block_dev_desc->dev,
127 part_info->start + sector, 1,
128 (unsigned long *) sec_buf) != 1) {
129 printf("* %s read error - last part\n", __func__);
132 memcpy(buf, sec_buf, byte_len);
137 int ext4_read_superblock(char *buffer)
139 struct ext_filesystem *fs = get_fs();
140 int sect = SUPERBLOCK_START >> fs->dev_desc->log2blksz;
141 int off = SUPERBLOCK_START % fs->dev_desc->blksz;
143 return ext4fs_devread(sect, off, SUPERBLOCK_SIZE,