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 = ((uint64_t)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 int readlen; 77 /* read first part which isn't aligned with start of sector */ 78 if (ext4fs_block_dev_desc-> 79 block_read(ext4fs_block_dev_desc->dev, 80 part_info->start + sector, 1, 81 (unsigned long *) sec_buf) != 1) { 82 printf(" ** ext2fs_devread() read error **\n"); 83 return 0; 84 } 85 readlen = min((int)ext4fs_block_dev_desc->blksz - byte_offset, 86 byte_len); 87 memcpy(buf, sec_buf + byte_offset, readlen); 88 buf += readlen; 89 byte_len -= readlen; 90 sector++; 91 } 92 93 if (byte_len == 0) 94 return 1; 95 96 /* read sector aligned part */ 97 block_len = byte_len & ~(ext4fs_block_dev_desc->blksz - 1); 98 99 if (block_len == 0) { 100 ALLOC_CACHE_ALIGN_BUFFER(u8, p, ext4fs_block_dev_desc->blksz); 101 102 block_len = ext4fs_block_dev_desc->blksz; 103 ext4fs_block_dev_desc->block_read(ext4fs_block_dev_desc->dev, 104 part_info->start + sector, 105 1, (unsigned long *)p); 106 memcpy(buf, p, byte_len); 107 return 1; 108 } 109 110 if (ext4fs_block_dev_desc->block_read(ext4fs_block_dev_desc->dev, 111 part_info->start + sector, 112 block_len >> log2blksz, 113 (unsigned long *) buf) != 114 block_len >> log2blksz) { 115 printf(" ** %s read error - block\n", __func__); 116 return 0; 117 } 118 block_len = byte_len & ~(ext4fs_block_dev_desc->blksz - 1); 119 buf += block_len; 120 byte_len -= block_len; 121 sector += block_len / ext4fs_block_dev_desc->blksz; 122 123 if (byte_len != 0) { 124 /* read rest of data which are not in whole sector */ 125 if (ext4fs_block_dev_desc-> 126 block_read(ext4fs_block_dev_desc->dev, 127 part_info->start + sector, 1, 128 (unsigned long *) sec_buf) != 1) { 129 printf("* %s read error - last part\n", __func__); 130 return 0; 131 } 132 memcpy(buf, sec_buf, byte_len); 133 } 134 return 1; 135 } 136 137 int ext4_read_superblock(char *buffer) 138 { 139 struct ext_filesystem *fs = get_fs(); 140 int sect = SUPERBLOCK_START >> fs->dev_desc->log2blksz; 141 int off = SUPERBLOCK_START % fs->dev_desc->blksz; 142 143 return ext4fs_devread(sect, off, SUPERBLOCK_SIZE, 144 buffer); 145 } 146