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 <memalign.h> 29 #include <ext4fs.h> 30 #include <ext_common.h> 31 #include "ext4_common.h" 32 33 lbaint_t part_offset; 34 35 static block_dev_desc_t *ext4fs_block_dev_desc; 36 static disk_partition_t *part_info; 37 38 void ext4fs_set_blk_dev(block_dev_desc_t *rbdd, disk_partition_t *info) 39 { 40 assert(rbdd->blksz == (1 << rbdd->log2blksz)); 41 ext4fs_block_dev_desc = rbdd; 42 get_fs()->dev_desc = rbdd; 43 part_info = info; 44 part_offset = info->start; 45 get_fs()->total_sect = ((uint64_t)info->size * info->blksz) >> 46 get_fs()->dev_desc->log2blksz; 47 } 48 49 int ext4fs_devread(lbaint_t sector, int byte_offset, int byte_len, char *buf) 50 { 51 unsigned block_len; 52 int log2blksz = ext4fs_block_dev_desc->log2blksz; 53 ALLOC_CACHE_ALIGN_BUFFER(char, sec_buf, (ext4fs_block_dev_desc ? 54 ext4fs_block_dev_desc->blksz : 55 0)); 56 if (ext4fs_block_dev_desc == NULL) { 57 printf("** Invalid Block Device Descriptor (NULL)\n"); 58 return 0; 59 } 60 61 /* Check partition boundaries */ 62 if ((sector < 0) || 63 ((sector + ((byte_offset + byte_len - 1) >> log2blksz)) 64 >= part_info->size)) { 65 printf("%s read outside partition " LBAFU "\n", __func__, 66 sector); 67 return 0; 68 } 69 70 /* Get the read to the beginning of a partition */ 71 sector += byte_offset >> log2blksz; 72 byte_offset &= ext4fs_block_dev_desc->blksz - 1; 73 74 debug(" <" LBAFU ", %d, %d>\n", sector, byte_offset, byte_len); 75 76 if (byte_offset != 0) { 77 int readlen; 78 /* read first part which isn't aligned with start of sector */ 79 if (ext4fs_block_dev_desc->block_read(ext4fs_block_dev_desc, 80 part_info->start + sector, 81 1, (void *)sec_buf) 82 != 1) { 83 printf(" ** ext2fs_devread() read error **\n"); 84 return 0; 85 } 86 readlen = min((int)ext4fs_block_dev_desc->blksz - byte_offset, 87 byte_len); 88 memcpy(buf, sec_buf + byte_offset, readlen); 89 buf += readlen; 90 byte_len -= readlen; 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, 105 part_info->start + sector, 106 1, (void *)p); 107 memcpy(buf, p, byte_len); 108 return 1; 109 } 110 111 if (ext4fs_block_dev_desc->block_read(ext4fs_block_dev_desc, 112 part_info->start + sector, 113 block_len >> log2blksz, 114 (void *)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->block_read(ext4fs_block_dev_desc, 127 part_info->start + sector, 128 1, (void *)sec_buf) 129 != 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