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Uma Shankara1596432012-05-25 21:21:44 +05301/*
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>
6 *
7 * made from existing ext2/dev.c file of Uboot
8 * (C) Copyright 2004
9 * esd gmbh <www.esd-electronics.com>
10 * Reinhard Arlt <reinhard.arlt@esd-electronics.com>
11 *
12 * based on code of fs/reiserfs/dev.c by
13 *
14 * (C) Copyright 2003 - 2004
15 * Sysgo AG, <www.elinos.com>, Pavel Bartusek <pba@sysgo.com>
16 *
Wolfgang Denk1a459662013-07-08 09:37:19 +020017 * SPDX-License-Identifier: GPL-2.0+
Uma Shankara1596432012-05-25 21:21:44 +053018 */
19
20/*
21 * Changelog:
22 * 0.1 - Newly created file for ext4fs support. Taken from
23 * fs/ext2/dev.c file in uboot.
24 */
25
26#include <common.h>
27#include <config.h>
Rob Herring81180812012-08-23 11:31:46 +000028#include <ext4fs.h>
Uma Shankara1596432012-05-25 21:21:44 +053029#include <ext_common.h>
Egbert Eich50ce4c02013-05-01 01:13:19 +000030#include "ext4_common.h"
Uma Shankara1596432012-05-25 21:21:44 +053031
Frederic Leroy04735e92013-06-26 18:11:25 +020032lbaint_t part_offset;
Uma Shankara1596432012-05-25 21:21:44 +053033
Rob Herring81180812012-08-23 11:31:46 +000034static block_dev_desc_t *ext4fs_block_dev_desc;
35static disk_partition_t *part_info;
36
37void ext4fs_set_blk_dev(block_dev_desc_t *rbdd, disk_partition_t *info)
Uma Shankara1596432012-05-25 21:21:44 +053038{
Egbert Eich50ce4c02013-05-01 01:13:19 +000039 assert(rbdd->blksz == (1 << rbdd->log2blksz));
Uma Shankara1596432012-05-25 21:21:44 +053040 ext4fs_block_dev_desc = rbdd;
Stephen Warrenc28cbfa2013-05-23 10:22:10 +000041 get_fs()->dev_desc = rbdd;
Rob Herring81180812012-08-23 11:31:46 +000042 part_info = info;
43 part_offset = info->start;
Ma Haijunf1782882014-01-08 06:49:43 +080044 get_fs()->total_sect = ((uint64_t)info->size * info->blksz) >>
Egbert Eich50ce4c02013-05-01 01:13:19 +000045 get_fs()->dev_desc->log2blksz;
Uma Shankara1596432012-05-25 21:21:44 +053046}
47
Frederic Leroy04735e92013-06-26 18:11:25 +020048int ext4fs_devread(lbaint_t sector, int byte_offset, int byte_len, char *buf)
Uma Shankara1596432012-05-25 21:21:44 +053049{
Uma Shankara1596432012-05-25 21:21:44 +053050 unsigned block_len;
Egbert Eich50ce4c02013-05-01 01:13:19 +000051 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 :
54 0));
55 if (ext4fs_block_dev_desc == NULL) {
56 printf("** Invalid Block Device Descriptor (NULL)\n");
57 return 0;
58 }
Uma Shankara1596432012-05-25 21:21:44 +053059
60 /* Check partition boundaries */
Egbert Eich50ce4c02013-05-01 01:13:19 +000061 if ((sector < 0) ||
62 ((sector + ((byte_offset + byte_len - 1) >> log2blksz))
63 >= part_info->size)) {
Frederic Leroy04735e92013-06-26 18:11:25 +020064 printf("%s read outside partition " LBAFU "\n", __func__,
65 sector);
Uma Shankara1596432012-05-25 21:21:44 +053066 return 0;
67 }
68
69 /* Get the read to the beginning of a partition */
Egbert Eich50ce4c02013-05-01 01:13:19 +000070 sector += byte_offset >> log2blksz;
71 byte_offset &= ext4fs_block_dev_desc->blksz - 1;
Uma Shankara1596432012-05-25 21:21:44 +053072
Frederic Leroy04735e92013-06-26 18:11:25 +020073 debug(" <" LBAFU ", %d, %d>\n", sector, byte_offset, byte_len);
Uma Shankara1596432012-05-25 21:21:44 +053074
Uma Shankara1596432012-05-25 21:21:44 +053075 if (byte_offset != 0) {
76 /* read first part which isn't aligned with start of sector */
77 if (ext4fs_block_dev_desc->
78 block_read(ext4fs_block_dev_desc->dev,
Rob Herring81180812012-08-23 11:31:46 +000079 part_info->start + sector, 1,
Uma Shankara1596432012-05-25 21:21:44 +053080 (unsigned long *) sec_buf) != 1) {
81 printf(" ** ext2fs_devread() read error **\n");
82 return 0;
83 }
84 memcpy(buf, sec_buf + byte_offset,
Egbert Eich50ce4c02013-05-01 01:13:19 +000085 min(ext4fs_block_dev_desc->blksz
86 - byte_offset, byte_len));
87 buf += min(ext4fs_block_dev_desc->blksz
88 - byte_offset, byte_len);
89 byte_len -= min(ext4fs_block_dev_desc->blksz
90 - byte_offset, byte_len);
Uma Shankara1596432012-05-25 21:21:44 +053091 sector++;
92 }
93
94 if (byte_len == 0)
95 return 1;
96
97 /* read sector aligned part */
Egbert Eich50ce4c02013-05-01 01:13:19 +000098 block_len = byte_len & ~(ext4fs_block_dev_desc->blksz - 1);
Uma Shankara1596432012-05-25 21:21:44 +053099
100 if (block_len == 0) {
Egbert Eich50ce4c02013-05-01 01:13:19 +0000101 ALLOC_CACHE_ALIGN_BUFFER(u8, p, ext4fs_block_dev_desc->blksz);
Uma Shankara1596432012-05-25 21:21:44 +0530102
Egbert Eich50ce4c02013-05-01 01:13:19 +0000103 block_len = ext4fs_block_dev_desc->blksz;
Uma Shankara1596432012-05-25 21:21:44 +0530104 ext4fs_block_dev_desc->block_read(ext4fs_block_dev_desc->dev,
Rob Herring81180812012-08-23 11:31:46 +0000105 part_info->start + sector,
Uma Shankara1596432012-05-25 21:21:44 +0530106 1, (unsigned long *)p);
107 memcpy(buf, p, byte_len);
108 return 1;
109 }
110
111 if (ext4fs_block_dev_desc->block_read(ext4fs_block_dev_desc->dev,
Rob Herring81180812012-08-23 11:31:46 +0000112 part_info->start + sector,
Egbert Eich50ce4c02013-05-01 01:13:19 +0000113 block_len >> log2blksz,
Uma Shankara1596432012-05-25 21:21:44 +0530114 (unsigned long *) buf) !=
Egbert Eich50ce4c02013-05-01 01:13:19 +0000115 block_len >> log2blksz) {
Uma Shankara1596432012-05-25 21:21:44 +0530116 printf(" ** %s read error - block\n", __func__);
117 return 0;
118 }
Egbert Eich50ce4c02013-05-01 01:13:19 +0000119 block_len = byte_len & ~(ext4fs_block_dev_desc->blksz - 1);
Uma Shankara1596432012-05-25 21:21:44 +0530120 buf += block_len;
121 byte_len -= block_len;
Egbert Eich50ce4c02013-05-01 01:13:19 +0000122 sector += block_len / ext4fs_block_dev_desc->blksz;
Uma Shankara1596432012-05-25 21:21:44 +0530123
124 if (byte_len != 0) {
125 /* read rest of data which are not in whole sector */
126 if (ext4fs_block_dev_desc->
127 block_read(ext4fs_block_dev_desc->dev,
Rob Herring81180812012-08-23 11:31:46 +0000128 part_info->start + sector, 1,
Uma Shankara1596432012-05-25 21:21:44 +0530129 (unsigned long *) sec_buf) != 1) {
130 printf("* %s read error - last part\n", __func__);
131 return 0;
132 }
133 memcpy(buf, sec_buf, byte_len);
134 }
135 return 1;
136}
Egbert Eich50ce4c02013-05-01 01:13:19 +0000137
138int ext4_read_superblock(char *buffer)
139{
140 struct ext_filesystem *fs = get_fs();
141 int sect = SUPERBLOCK_START >> fs->dev_desc->log2blksz;
142 int off = SUPERBLOCK_START % fs->dev_desc->blksz;
143
144 return ext4fs_devread(sect, off, SUPERBLOCK_SIZE,
145 buffer);
146}