blob: ee84d3fbe182675582c546de8b4bf4f3ad78fe02 [file] [log] [blame]
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>
Simon Glass2a981dc2016-02-29 15:25:52 -070027#include <blk.h>
Uma Shankara1596432012-05-25 21:21:44 +053028#include <config.h>
Simon Glasscf92e052015-09-02 17:24:58 -060029#include <memalign.h>
Rob Herring81180812012-08-23 11:31:46 +000030#include <ext4fs.h>
Uma Shankara1596432012-05-25 21:21:44 +053031#include <ext_common.h>
Egbert Eich50ce4c02013-05-01 01:13:19 +000032#include "ext4_common.h"
Uma Shankara1596432012-05-25 21:21:44 +053033
Frederic Leroy04735e92013-06-26 18:11:25 +020034lbaint_t part_offset;
Uma Shankara1596432012-05-25 21:21:44 +053035
Simon Glass4101f682016-02-29 15:25:34 -070036static struct blk_desc *ext4fs_blk_desc;
Rob Herring81180812012-08-23 11:31:46 +000037static disk_partition_t *part_info;
38
Simon Glass4101f682016-02-29 15:25:34 -070039void ext4fs_set_blk_dev(struct blk_desc *rbdd, disk_partition_t *info)
Uma Shankara1596432012-05-25 21:21:44 +053040{
Egbert Eich50ce4c02013-05-01 01:13:19 +000041 assert(rbdd->blksz == (1 << rbdd->log2blksz));
Simon Glass4101f682016-02-29 15:25:34 -070042 ext4fs_blk_desc = rbdd;
Stephen Warrenc28cbfa2013-05-23 10:22:10 +000043 get_fs()->dev_desc = rbdd;
Rob Herring81180812012-08-23 11:31:46 +000044 part_info = info;
45 part_offset = info->start;
Ma Haijunf1782882014-01-08 06:49:43 +080046 get_fs()->total_sect = ((uint64_t)info->size * info->blksz) >>
Egbert Eich50ce4c02013-05-01 01:13:19 +000047 get_fs()->dev_desc->log2blksz;
Uma Shankara1596432012-05-25 21:21:44 +053048}
49
Frederic Leroy04735e92013-06-26 18:11:25 +020050int ext4fs_devread(lbaint_t sector, int byte_offset, int byte_len, char *buf)
Uma Shankara1596432012-05-25 21:21:44 +053051{
Uma Shankara1596432012-05-25 21:21:44 +053052 unsigned block_len;
Simon Glass4101f682016-02-29 15:25:34 -070053 int log2blksz = ext4fs_blk_desc->log2blksz;
54 ALLOC_CACHE_ALIGN_BUFFER(char, sec_buf, (ext4fs_blk_desc ?
55 ext4fs_blk_desc->blksz :
Egbert Eich50ce4c02013-05-01 01:13:19 +000056 0));
Simon Glass4101f682016-02-29 15:25:34 -070057 if (ext4fs_blk_desc == NULL) {
Egbert Eich50ce4c02013-05-01 01:13:19 +000058 printf("** Invalid Block Device Descriptor (NULL)\n");
59 return 0;
60 }
Uma Shankara1596432012-05-25 21:21:44 +053061
62 /* Check partition boundaries */
Egbert Eich50ce4c02013-05-01 01:13:19 +000063 if ((sector < 0) ||
64 ((sector + ((byte_offset + byte_len - 1) >> log2blksz))
65 >= part_info->size)) {
Frederic Leroy04735e92013-06-26 18:11:25 +020066 printf("%s read outside partition " LBAFU "\n", __func__,
67 sector);
Uma Shankara1596432012-05-25 21:21:44 +053068 return 0;
69 }
70
71 /* Get the read to the beginning of a partition */
Egbert Eich50ce4c02013-05-01 01:13:19 +000072 sector += byte_offset >> log2blksz;
Simon Glass4101f682016-02-29 15:25:34 -070073 byte_offset &= ext4fs_blk_desc->blksz - 1;
Uma Shankara1596432012-05-25 21:21:44 +053074
Frederic Leroy04735e92013-06-26 18:11:25 +020075 debug(" <" LBAFU ", %d, %d>\n", sector, byte_offset, byte_len);
Uma Shankara1596432012-05-25 21:21:44 +053076
Uma Shankara1596432012-05-25 21:21:44 +053077 if (byte_offset != 0) {
Masahiro Yamadab4141192014-11-07 03:03:31 +090078 int readlen;
Uma Shankara1596432012-05-25 21:21:44 +053079 /* read first part which isn't aligned with start of sector */
Simon Glass2a981dc2016-02-29 15:25:52 -070080 if (blk_dread(ext4fs_blk_desc, part_info->start + sector, 1,
81 (void *)sec_buf) != 1) {
Uma Shankara1596432012-05-25 21:21:44 +053082 printf(" ** ext2fs_devread() read error **\n");
83 return 0;
84 }
Simon Glass4101f682016-02-29 15:25:34 -070085 readlen = min((int)ext4fs_blk_desc->blksz - byte_offset,
Masahiro Yamadab4141192014-11-07 03:03:31 +090086 byte_len);
87 memcpy(buf, sec_buf + byte_offset, readlen);
88 buf += readlen;
89 byte_len -= readlen;
Uma Shankara1596432012-05-25 21:21:44 +053090 sector++;
91 }
92
93 if (byte_len == 0)
94 return 1;
95
96 /* read sector aligned part */
Simon Glass4101f682016-02-29 15:25:34 -070097 block_len = byte_len & ~(ext4fs_blk_desc->blksz - 1);
Uma Shankara1596432012-05-25 21:21:44 +053098
99 if (block_len == 0) {
Simon Glass4101f682016-02-29 15:25:34 -0700100 ALLOC_CACHE_ALIGN_BUFFER(u8, p, ext4fs_blk_desc->blksz);
Uma Shankara1596432012-05-25 21:21:44 +0530101
Simon Glass4101f682016-02-29 15:25:34 -0700102 block_len = ext4fs_blk_desc->blksz;
Simon Glass2a981dc2016-02-29 15:25:52 -0700103 blk_dread(ext4fs_blk_desc, part_info->start + sector, 1,
104 (void *)p);
Uma Shankara1596432012-05-25 21:21:44 +0530105 memcpy(buf, p, byte_len);
106 return 1;
107 }
108
Simon Glass2a981dc2016-02-29 15:25:52 -0700109 if (blk_dread(ext4fs_blk_desc, part_info->start + sector,
110 block_len >> log2blksz, (void *)buf) !=
111 block_len >> log2blksz) {
Uma Shankara1596432012-05-25 21:21:44 +0530112 printf(" ** %s read error - block\n", __func__);
113 return 0;
114 }
Simon Glass4101f682016-02-29 15:25:34 -0700115 block_len = byte_len & ~(ext4fs_blk_desc->blksz - 1);
Uma Shankara1596432012-05-25 21:21:44 +0530116 buf += block_len;
117 byte_len -= block_len;
Simon Glass4101f682016-02-29 15:25:34 -0700118 sector += block_len / ext4fs_blk_desc->blksz;
Uma Shankara1596432012-05-25 21:21:44 +0530119
120 if (byte_len != 0) {
121 /* read rest of data which are not in whole sector */
Simon Glass2a981dc2016-02-29 15:25:52 -0700122 if (blk_dread(ext4fs_blk_desc, part_info->start + sector, 1,
123 (void *)sec_buf) != 1) {
Uma Shankara1596432012-05-25 21:21:44 +0530124 printf("* %s read error - last part\n", __func__);
125 return 0;
126 }
127 memcpy(buf, sec_buf, byte_len);
128 }
129 return 1;
130}
Egbert Eich50ce4c02013-05-01 01:13:19 +0000131
132int ext4_read_superblock(char *buffer)
133{
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;
137
138 return ext4fs_devread(sect, off, SUPERBLOCK_SIZE,
139 buffer);
140}