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 + ((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_blk_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 (blk_dread(ext4fs_blk_desc, part_info->start + sector, 1, 80 (void *)sec_buf) != 1) { 81 printf(" ** ext2fs_devread() read error **\n"); 82 return 0; 83 } 84 readlen = min((int)ext4fs_blk_desc->blksz - byte_offset, 85 byte_len); 86 memcpy(buf, sec_buf + byte_offset, readlen); 87 buf += readlen; 88 byte_len -= readlen; 89 sector++; 90 } 91 92 if (byte_len == 0) 93 return 1; 94 95 /* read sector aligned part */ 96 block_len = byte_len & ~(ext4fs_blk_desc->blksz - 1); 97 98 if (block_len == 0) { 99 ALLOC_CACHE_ALIGN_BUFFER(u8, p, ext4fs_blk_desc->blksz); 100 101 block_len = ext4fs_blk_desc->blksz; 102 blk_dread(ext4fs_blk_desc, part_info->start + sector, 1, 103 (void *)p); 104 memcpy(buf, p, byte_len); 105 return 1; 106 } 107 108 if (blk_dread(ext4fs_blk_desc, part_info->start + sector, 109 block_len >> log2blksz, (void *)buf) != 110 block_len >> log2blksz) { 111 printf(" ** %s read error - block\n", __func__); 112 return 0; 113 } 114 block_len = byte_len & ~(ext4fs_blk_desc->blksz - 1); 115 buf += block_len; 116 byte_len -= block_len; 117 sector += block_len / ext4fs_blk_desc->blksz; 118 119 if (byte_len != 0) { 120 /* read rest of data which are not in whole sector */ 121 if (blk_dread(ext4fs_blk_desc, part_info->start + sector, 1, 122 (void *)sec_buf) != 1) { 123 printf("* %s read error - last part\n", __func__); 124 return 0; 125 } 126 memcpy(buf, sec_buf, byte_len); 127 } 128 return 1; 129 } 130 131 int ext4_read_superblock(char *buffer) 132 { 133 struct ext_filesystem *fs = get_fs(); 134 int sect = SUPERBLOCK_START >> fs->dev_desc->log2blksz; 135 int off = SUPERBLOCK_START % fs->dev_desc->blksz; 136 137 return ext4fs_devread(sect, off, SUPERBLOCK_SIZE, 138 buffer); 139 } 140