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 <blk.h> 28 #include <config.h> 29 #include <memalign.h> 30 #include <ext4fs.h> 31 #include <ext_common.h> 32 #include "ext4_common.h" 33 34 lbaint_t part_offset; 35 36 static struct blk_desc *ext4fs_blk_desc; 37 static disk_partition_t *part_info; 38 39 void ext4fs_set_blk_dev(struct blk_desc *rbdd, disk_partition_t *info) 40 { 41 assert(rbdd->blksz == (1 << rbdd->log2blksz)); 42 ext4fs_blk_desc = rbdd; 43 get_fs()->dev_desc = rbdd; 44 part_info = info; 45 part_offset = info->start; 46 get_fs()->total_sect = ((uint64_t)info->size * info->blksz) >> 47 get_fs()->dev_desc->log2blksz; 48 } 49 50 int ext4fs_devread(lbaint_t sector, int byte_offset, int byte_len, char *buf) 51 { 52 unsigned block_len; 53 int log2blksz = ext4fs_blk_desc->log2blksz; 54 ALLOC_CACHE_ALIGN_BUFFER(char, sec_buf, (ext4fs_blk_desc ? 55 ext4fs_blk_desc->blksz : 56 0)); 57 if (ext4fs_blk_desc == NULL) { 58 printf("** Invalid Block Device Descriptor (NULL)\n"); 59 return 0; 60 } 61 62 /* Check partition boundaries */ 63 if ((sector < 0) || 64 ((sector + ((byte_offset + byte_len - 1) >> log2blksz)) 65 >= part_info->size)) { 66 printf("%s read outside partition " LBAFU "\n", __func__, 67 sector); 68 return 0; 69 } 70 71 /* Get the read to the beginning of a partition */ 72 sector += byte_offset >> log2blksz; 73 byte_offset &= ext4fs_blk_desc->blksz - 1; 74 75 debug(" <" LBAFU ", %d, %d>\n", sector, byte_offset, byte_len); 76 77 if (byte_offset != 0) { 78 int readlen; 79 /* read first part which isn't aligned with start of sector */ 80 if (blk_dread(ext4fs_blk_desc, part_info->start + sector, 1, 81 (void *)sec_buf) != 1) { 82 printf(" ** ext2fs_devread() read error **\n"); 83 return 0; 84 } 85 readlen = min((int)ext4fs_blk_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_blk_desc->blksz - 1); 98 99 if (block_len == 0) { 100 ALLOC_CACHE_ALIGN_BUFFER(u8, p, ext4fs_blk_desc->blksz); 101 102 block_len = ext4fs_blk_desc->blksz; 103 blk_dread(ext4fs_blk_desc, part_info->start + sector, 1, 104 (void *)p); 105 memcpy(buf, p, byte_len); 106 return 1; 107 } 108 109 if (blk_dread(ext4fs_blk_desc, part_info->start + sector, 110 block_len >> log2blksz, (void *)buf) != 111 block_len >> log2blksz) { 112 printf(" ** %s read error - block\n", __func__); 113 return 0; 114 } 115 block_len = byte_len & ~(ext4fs_blk_desc->blksz - 1); 116 buf += block_len; 117 byte_len -= block_len; 118 sector += block_len / ext4fs_blk_desc->blksz; 119 120 if (byte_len != 0) { 121 /* read rest of data which are not in whole sector */ 122 if (blk_dread(ext4fs_blk_desc, part_info->start + sector, 1, 123 (void *)sec_buf) != 1) { 124 printf("* %s read error - last part\n", __func__); 125 return 0; 126 } 127 memcpy(buf, sec_buf, byte_len); 128 } 129 return 1; 130 } 131 132 int ext4_read_superblock(char *buffer) 133 { 134 struct ext_filesystem *fs = get_fs(); 135 int sect = SUPERBLOCK_START >> fs->dev_desc->log2blksz; 136 int off = SUPERBLOCK_START % fs->dev_desc->blksz; 137 138 return ext4fs_devread(sect, off, SUPERBLOCK_SIZE, 139 buffer); 140 } 141