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> 41 #include <ext4fs.h> 42 #include <ext_common.h> 43 #include "ext4_common.h" 44 45 unsigned long part_offset; 46 47 static block_dev_desc_t *ext4fs_block_dev_desc; 48 static disk_partition_t *part_info; 49 50 void ext4fs_set_blk_dev(block_dev_desc_t *rbdd, disk_partition_t *info) 51 { 52 assert(rbdd->blksz == (1 << rbdd->log2blksz)); 53 ext4fs_block_dev_desc = rbdd; 54 get_fs()->dev_desc = rbdd; 55 part_info = info; 56 part_offset = info->start; 57 get_fs()->total_sect = (info->size * info->blksz) >> 58 get_fs()->dev_desc->log2blksz; 59 } 60 61 int ext4fs_devread(int sector, int byte_offset, int byte_len, char *buf) 62 { 63 unsigned block_len; 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 } 72 73 /* Check partition boundaries */ 74 if ((sector < 0) || 75 ((sector + ((byte_offset + byte_len - 1) >> log2blksz)) 76 >= part_info->size)) { 77 printf("%s read outside partition %d\n", __func__, sector); 78 return 0; 79 } 80 81 /* Get the read to the beginning of a partition */ 82 sector += byte_offset >> log2blksz; 83 byte_offset &= ext4fs_block_dev_desc->blksz - 1; 84 85 debug(" <%d, %d, %d>\n", sector, byte_offset, byte_len); 86 87 if (byte_offset != 0) { 88 /* read first part which isn't aligned with start of sector */ 89 if (ext4fs_block_dev_desc-> 90 block_read(ext4fs_block_dev_desc->dev, 91 part_info->start + sector, 1, 92 (unsigned long *) sec_buf) != 1) { 93 printf(" ** ext2fs_devread() read error **\n"); 94 return 0; 95 } 96 memcpy(buf, sec_buf + byte_offset, 97 min(ext4fs_block_dev_desc->blksz 98 - byte_offset, byte_len)); 99 buf += min(ext4fs_block_dev_desc->blksz 100 - byte_offset, byte_len); 101 byte_len -= min(ext4fs_block_dev_desc->blksz 102 - byte_offset, byte_len); 103 sector++; 104 } 105 106 if (byte_len == 0) 107 return 1; 108 109 /* read sector aligned part */ 110 block_len = byte_len & ~(ext4fs_block_dev_desc->blksz - 1); 111 112 if (block_len == 0) { 113 ALLOC_CACHE_ALIGN_BUFFER(u8, p, ext4fs_block_dev_desc->blksz); 114 115 block_len = ext4fs_block_dev_desc->blksz; 116 ext4fs_block_dev_desc->block_read(ext4fs_block_dev_desc->dev, 117 part_info->start + sector, 118 1, (unsigned long *)p); 119 memcpy(buf, p, byte_len); 120 return 1; 121 } 122 123 if (ext4fs_block_dev_desc->block_read(ext4fs_block_dev_desc->dev, 124 part_info->start + sector, 125 block_len >> log2blksz, 126 (unsigned long *) buf) != 127 block_len >> log2blksz) { 128 printf(" ** %s read error - block\n", __func__); 129 return 0; 130 } 131 block_len = byte_len & ~(ext4fs_block_dev_desc->blksz - 1); 132 buf += block_len; 133 byte_len -= block_len; 134 sector += block_len / ext4fs_block_dev_desc->blksz; 135 136 if (byte_len != 0) { 137 /* read rest of data which are not in whole sector */ 138 if (ext4fs_block_dev_desc-> 139 block_read(ext4fs_block_dev_desc->dev, 140 part_info->start + sector, 1, 141 (unsigned long *) sec_buf) != 1) { 142 printf("* %s read error - last part\n", __func__); 143 return 0; 144 } 145 memcpy(buf, sec_buf, byte_len); 146 } 147 return 1; 148 } 149 150 int ext4_read_superblock(char *buffer) 151 { 152 struct ext_filesystem *fs = get_fs(); 153 int sect = SUPERBLOCK_START >> fs->dev_desc->log2blksz; 154 int off = SUPERBLOCK_START % fs->dev_desc->blksz; 155 156 return ext4fs_devread(sect, off, SUPERBLOCK_SIZE, 157 buffer); 158 } 159