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a1596438 US |
1 | /* |
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 | * | |
17 | * This program is free software; you can redistribute it and/or modify | |
18 | * it under the terms of the GNU General Public License as published by | |
19 | * the Free Software Foundation; either version 2 of the License, or | |
20 | * (at your option) any later version. | |
21 | * | |
22 | * This program is distributed in the hope that it will be useful, | |
23 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
24 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
25 | * GNU General Public License for more details. | |
26 | * | |
27 | * You should have received a copy of the GNU General Public License | |
28 | * along with this program; if not, write to the Free Software | |
29 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
30 | * | |
31 | */ | |
32 | ||
33 | /* | |
34 | * Changelog: | |
35 | * 0.1 - Newly created file for ext4fs support. Taken from | |
36 | * fs/ext2/dev.c file in uboot. | |
37 | */ | |
38 | ||
39 | #include <common.h> | |
40 | #include <config.h> | |
81180819 | 41 | #include <ext4fs.h> |
a1596438 | 42 | #include <ext_common.h> |
50ce4c07 | 43 | #include "ext4_common.h" |
a1596438 | 44 | |
04735e9c | 45 | lbaint_t part_offset; |
81180819 | 46 | |
a1596438 | 47 | static block_dev_desc_t *ext4fs_block_dev_desc; |
81180819 | 48 | static disk_partition_t *part_info; |
a1596438 | 49 | |
81180819 | 50 | void ext4fs_set_blk_dev(block_dev_desc_t *rbdd, disk_partition_t *info) |
a1596438 | 51 | { |
50ce4c07 | 52 | assert(rbdd->blksz == (1 << rbdd->log2blksz)); |
a1596438 | 53 | ext4fs_block_dev_desc = rbdd; |
c28cbfa1 | 54 | get_fs()->dev_desc = rbdd; |
81180819 RH |
55 | part_info = info; |
56 | part_offset = info->start; | |
50ce4c07 EE |
57 | get_fs()->total_sect = (info->size * info->blksz) >> |
58 | get_fs()->dev_desc->log2blksz; | |
a1596438 US |
59 | } |
60 | ||
04735e9c | 61 | int ext4fs_devread(lbaint_t sector, int byte_offset, int byte_len, char *buf) |
a1596438 | 62 | { |
a1596438 | 63 | unsigned block_len; |
50ce4c07 EE |
64 | int log2blksz = ext4fs_block_dev_desc->log2blksz; |
65 | ALLOC_CACHE_ALIGN_BUFFER(char, sec_buf, (ext4fs_block_dev_desc ? | |
66 | ext4fs_block_dev_desc->blksz : | |
67 | 0)); | |
68 | if (ext4fs_block_dev_desc == NULL) { | |
69 | printf("** Invalid Block Device Descriptor (NULL)\n"); | |
70 | return 0; | |
71 | } | |
a1596438 US |
72 | |
73 | /* Check partition boundaries */ | |
50ce4c07 EE |
74 | if ((sector < 0) || |
75 | ((sector + ((byte_offset + byte_len - 1) >> log2blksz)) | |
76 | >= part_info->size)) { | |
04735e9c FL |
77 | printf("%s read outside partition " LBAFU "\n", __func__, |
78 | sector); | |
a1596438 US |
79 | return 0; |
80 | } | |
81 | ||
82 | /* Get the read to the beginning of a partition */ | |
50ce4c07 EE |
83 | sector += byte_offset >> log2blksz; |
84 | byte_offset &= ext4fs_block_dev_desc->blksz - 1; | |
a1596438 | 85 | |
04735e9c | 86 | debug(" <" LBAFU ", %d, %d>\n", sector, byte_offset, byte_len); |
a1596438 | 87 | |
a1596438 US |
88 | if (byte_offset != 0) { |
89 | /* read first part which isn't aligned with start of sector */ | |
90 | if (ext4fs_block_dev_desc-> | |
91 | block_read(ext4fs_block_dev_desc->dev, | |
81180819 | 92 | part_info->start + sector, 1, |
a1596438 US |
93 | (unsigned long *) sec_buf) != 1) { |
94 | printf(" ** ext2fs_devread() read error **\n"); | |
95 | return 0; | |
96 | } | |
97 | memcpy(buf, sec_buf + byte_offset, | |
50ce4c07 EE |
98 | min(ext4fs_block_dev_desc->blksz |
99 | - byte_offset, byte_len)); | |
100 | buf += min(ext4fs_block_dev_desc->blksz | |
101 | - byte_offset, byte_len); | |
102 | byte_len -= min(ext4fs_block_dev_desc->blksz | |
103 | - byte_offset, byte_len); | |
a1596438 US |
104 | sector++; |
105 | } | |
106 | ||
107 | if (byte_len == 0) | |
108 | return 1; | |
109 | ||
110 | /* read sector aligned part */ | |
50ce4c07 | 111 | block_len = byte_len & ~(ext4fs_block_dev_desc->blksz - 1); |
a1596438 US |
112 | |
113 | if (block_len == 0) { | |
50ce4c07 | 114 | ALLOC_CACHE_ALIGN_BUFFER(u8, p, ext4fs_block_dev_desc->blksz); |
a1596438 | 115 | |
50ce4c07 | 116 | block_len = ext4fs_block_dev_desc->blksz; |
a1596438 | 117 | ext4fs_block_dev_desc->block_read(ext4fs_block_dev_desc->dev, |
81180819 | 118 | part_info->start + sector, |
a1596438 US |
119 | 1, (unsigned long *)p); |
120 | memcpy(buf, p, byte_len); | |
121 | return 1; | |
122 | } | |
123 | ||
124 | if (ext4fs_block_dev_desc->block_read(ext4fs_block_dev_desc->dev, | |
81180819 | 125 | part_info->start + sector, |
50ce4c07 | 126 | block_len >> log2blksz, |
a1596438 | 127 | (unsigned long *) buf) != |
50ce4c07 | 128 | block_len >> log2blksz) { |
a1596438 US |
129 | printf(" ** %s read error - block\n", __func__); |
130 | return 0; | |
131 | } | |
50ce4c07 | 132 | block_len = byte_len & ~(ext4fs_block_dev_desc->blksz - 1); |
a1596438 US |
133 | buf += block_len; |
134 | byte_len -= block_len; | |
50ce4c07 | 135 | sector += block_len / ext4fs_block_dev_desc->blksz; |
a1596438 US |
136 | |
137 | if (byte_len != 0) { | |
138 | /* read rest of data which are not in whole sector */ | |
139 | if (ext4fs_block_dev_desc-> | |
140 | block_read(ext4fs_block_dev_desc->dev, | |
81180819 | 141 | part_info->start + sector, 1, |
a1596438 US |
142 | (unsigned long *) sec_buf) != 1) { |
143 | printf("* %s read error - last part\n", __func__); | |
144 | return 0; | |
145 | } | |
146 | memcpy(buf, sec_buf, byte_len); | |
147 | } | |
148 | return 1; | |
149 | } | |
50ce4c07 EE |
150 | |
151 | int ext4_read_superblock(char *buffer) | |
152 | { | |
153 | struct ext_filesystem *fs = get_fs(); | |
154 | int sect = SUPERBLOCK_START >> fs->dev_desc->log2blksz; | |
155 | int off = SUPERBLOCK_START % fs->dev_desc->blksz; | |
156 | ||
157 | return ext4fs_devread(sect, off, SUPERBLOCK_SIZE, | |
158 | buffer); | |
159 | } |