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 * SPDX-License-Identifier: GPL-2.0+ 18 */ 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> 28 #include <ext4fs.h> 29 #include <ext_common.h> 30 #include "ext4_common.h" 31 32 lbaint_t part_offset; 33 34 static block_dev_desc_t *ext4fs_block_dev_desc; 35 static disk_partition_t *part_info; 36 37 void ext4fs_set_blk_dev(block_dev_desc_t *rbdd, disk_partition_t *info) 38 { 39 assert(rbdd->blksz == (1 << rbdd->log2blksz)); 40 ext4fs_block_dev_desc = rbdd; 41 get_fs()->dev_desc = rbdd; 42 part_info = info; 43 part_offset = info->start; 44 get_fs()->total_sect = (info->size * info->blksz) >> 45 get_fs()->dev_desc->log2blksz; 46 } 47 48 int ext4fs_devread(lbaint_t sector, int byte_offset, int byte_len, char *buf) 49 { 50 unsigned block_len; 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 : 54 0)); 55 if (ext4fs_block_dev_desc == NULL) { 56 printf("** Invalid Block Device Descriptor (NULL)\n"); 57 return 0; 58 } 59 60 /* Check partition boundaries */ 61 if ((sector < 0) || 62 ((sector + ((byte_offset + byte_len - 1) >> log2blksz)) 63 >= part_info->size)) { 64 printf("%s read outside partition " LBAFU "\n", __func__, 65 sector); 66 return 0; 67 } 68 69 /* Get the read to the beginning of a partition */ 70 sector += byte_offset >> log2blksz; 71 byte_offset &= ext4fs_block_dev_desc->blksz - 1; 72 73 debug(" <" LBAFU ", %d, %d>\n", sector, byte_offset, byte_len); 74 75 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, 79 part_info->start + sector, 1, 80 (unsigned long *) sec_buf) != 1) { 81 printf(" ** ext2fs_devread() read error **\n"); 82 return 0; 83 } 84 memcpy(buf, sec_buf + byte_offset, 85 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); 91 sector++; 92 } 93 94 if (byte_len == 0) 95 return 1; 96 97 /* read sector aligned part */ 98 block_len = byte_len & ~(ext4fs_block_dev_desc->blksz - 1); 99 100 if (block_len == 0) { 101 ALLOC_CACHE_ALIGN_BUFFER(u8, p, ext4fs_block_dev_desc->blksz); 102 103 block_len = ext4fs_block_dev_desc->blksz; 104 ext4fs_block_dev_desc->block_read(ext4fs_block_dev_desc->dev, 105 part_info->start + sector, 106 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, 112 part_info->start + sector, 113 block_len >> log2blksz, 114 (unsigned long *) buf) != 115 block_len >> log2blksz) { 116 printf(" ** %s read error - block\n", __func__); 117 return 0; 118 } 119 block_len = byte_len & ~(ext4fs_block_dev_desc->blksz - 1); 120 buf += block_len; 121 byte_len -= block_len; 122 sector += block_len / ext4fs_block_dev_desc->blksz; 123 124 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, 128 part_info->start + sector, 1, 129 (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 } 137 138 int 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 } 147