1a1596438SUma Shankar /* 2a1596438SUma Shankar * (C) Copyright 2011 - 2012 Samsung Electronics 3a1596438SUma Shankar * EXT4 filesystem implementation in Uboot by 4a1596438SUma Shankar * Uma Shankar <uma.shankar@samsung.com> 5a1596438SUma Shankar * Manjunatha C Achar <a.manjunatha@samsung.com> 6a1596438SUma Shankar * 7a1596438SUma Shankar * ext4ls and ext4load : Based on ext2 ls and load support in Uboot. 8a1596438SUma Shankar * Ext4 read optimization taken from Open-Moko 9a1596438SUma Shankar * Qi bootloader 10a1596438SUma Shankar * 11a1596438SUma Shankar * (C) Copyright 2004 12a1596438SUma Shankar * esd gmbh <www.esd-electronics.com> 13a1596438SUma Shankar * Reinhard Arlt <reinhard.arlt@esd-electronics.com> 14a1596438SUma Shankar * 15a1596438SUma Shankar * based on code from grub2 fs/ext2.c and fs/fshelp.c by 16a1596438SUma Shankar * GRUB -- GRand Unified Bootloader 17a1596438SUma Shankar * Copyright (C) 2003, 2004 Free Software Foundation, Inc. 18a1596438SUma Shankar * 19ed34f34dSUma Shankar * ext4write : Based on generic ext4 protocol. 20ed34f34dSUma Shankar * 21a1596438SUma Shankar * This program is free software; you can redistribute it and/or modify 22a1596438SUma Shankar * it under the terms of the GNU General Public License as published by 23a1596438SUma Shankar * the Free Software Foundation; either version 2 of the License, or 24a1596438SUma Shankar * (at your option) any later version. 25a1596438SUma Shankar * 26a1596438SUma Shankar * This program is distributed in the hope that it will be useful, 27a1596438SUma Shankar * but WITHOUT ANY WARRANTY; without even the implied warranty of 28a1596438SUma Shankar * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 29a1596438SUma Shankar * GNU General Public License for more details. 30a1596438SUma Shankar * 31a1596438SUma Shankar * You should have received a copy of the GNU General Public License 32a1596438SUma Shankar * along with this program; if not, write to the Free Software 33a1596438SUma Shankar * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 34a1596438SUma Shankar */ 35a1596438SUma Shankar 36a1596438SUma Shankar #include <common.h> 37a1596438SUma Shankar #include <ext_common.h> 38a1596438SUma Shankar #include <ext4fs.h> 39a1596438SUma Shankar #include "ext4_common.h" 40a1596438SUma Shankar 41a1596438SUma Shankar int ext4fs_symlinknest; 4294501062SRob Herring struct ext_filesystem ext_fs; 43a1596438SUma Shankar 44a1596438SUma Shankar struct ext_filesystem *get_fs(void) 45a1596438SUma Shankar { 4694501062SRob Herring return &ext_fs; 47a1596438SUma Shankar } 48a1596438SUma Shankar 49a1596438SUma Shankar void ext4fs_free_node(struct ext2fs_node *node, struct ext2fs_node *currroot) 50a1596438SUma Shankar { 51a1596438SUma Shankar if ((node != &ext4fs_root->diropen) && (node != currroot)) 52a1596438SUma Shankar free(node); 53a1596438SUma Shankar } 54a1596438SUma Shankar 55a1596438SUma Shankar /* 56a1596438SUma Shankar * Taken from openmoko-kernel mailing list: By Andy green 57a1596438SUma Shankar * Optimized read file API : collects and defers contiguous sector 58a1596438SUma Shankar * reads into one potentially more efficient larger sequential read action 59a1596438SUma Shankar */ 60a1596438SUma Shankar int ext4fs_read_file(struct ext2fs_node *node, int pos, 61a1596438SUma Shankar unsigned int len, char *buf) 62a1596438SUma Shankar { 63a1596438SUma Shankar int i; 64a1596438SUma Shankar int blockcnt; 65a1596438SUma Shankar int log2blocksize = LOG2_EXT2_BLOCK_SIZE(node->data); 66a1596438SUma Shankar int blocksize = 1 << (log2blocksize + DISK_SECTOR_BITS); 67a1596438SUma Shankar unsigned int filesize = __le32_to_cpu(node->inode.size); 68a1596438SUma Shankar int previous_block_number = -1; 69a1596438SUma Shankar int delayed_start = 0; 70a1596438SUma Shankar int delayed_extent = 0; 71a1596438SUma Shankar int delayed_skipfirst = 0; 72a1596438SUma Shankar int delayed_next = 0; 73a1596438SUma Shankar char *delayed_buf = NULL; 74a1596438SUma Shankar short status; 75a1596438SUma Shankar 76a1596438SUma Shankar /* Adjust len so it we can't read past the end of the file. */ 77a1596438SUma Shankar if (len > filesize) 78a1596438SUma Shankar len = filesize; 79a1596438SUma Shankar 80a1596438SUma Shankar blockcnt = ((len + pos) + blocksize - 1) / blocksize; 81a1596438SUma Shankar 82a1596438SUma Shankar for (i = pos / blocksize; i < blockcnt; i++) { 83a1596438SUma Shankar int blknr; 84a1596438SUma Shankar int blockoff = pos % blocksize; 85a1596438SUma Shankar int blockend = blocksize; 86a1596438SUma Shankar int skipfirst = 0; 87a1596438SUma Shankar blknr = read_allocated_block(&(node->inode), i); 88a1596438SUma Shankar if (blknr < 0) 89a1596438SUma Shankar return -1; 90a1596438SUma Shankar 91a1596438SUma Shankar blknr = blknr << log2blocksize; 92a1596438SUma Shankar 93a1596438SUma Shankar /* Last block. */ 94a1596438SUma Shankar if (i == blockcnt - 1) { 95a1596438SUma Shankar blockend = (len + pos) % blocksize; 96a1596438SUma Shankar 97a1596438SUma Shankar /* The last portion is exactly blocksize. */ 98a1596438SUma Shankar if (!blockend) 99a1596438SUma Shankar blockend = blocksize; 100a1596438SUma Shankar } 101a1596438SUma Shankar 102a1596438SUma Shankar /* First block. */ 103a1596438SUma Shankar if (i == pos / blocksize) { 104a1596438SUma Shankar skipfirst = blockoff; 105a1596438SUma Shankar blockend -= skipfirst; 106a1596438SUma Shankar } 107a1596438SUma Shankar if (blknr) { 108a1596438SUma Shankar int status; 109a1596438SUma Shankar 110a1596438SUma Shankar if (previous_block_number != -1) { 111a1596438SUma Shankar if (delayed_next == blknr) { 112a1596438SUma Shankar delayed_extent += blockend; 113a1596438SUma Shankar delayed_next += blockend >> SECTOR_BITS; 114a1596438SUma Shankar } else { /* spill */ 115a1596438SUma Shankar status = ext4fs_devread(delayed_start, 116a1596438SUma Shankar delayed_skipfirst, 117a1596438SUma Shankar delayed_extent, 118a1596438SUma Shankar delayed_buf); 119a1596438SUma Shankar if (status == 0) 120a1596438SUma Shankar return -1; 121a1596438SUma Shankar previous_block_number = blknr; 122a1596438SUma Shankar delayed_start = blknr; 123a1596438SUma Shankar delayed_extent = blockend; 124a1596438SUma Shankar delayed_skipfirst = skipfirst; 125a1596438SUma Shankar delayed_buf = buf; 126a1596438SUma Shankar delayed_next = blknr + 127a1596438SUma Shankar (blockend >> SECTOR_BITS); 128a1596438SUma Shankar } 129a1596438SUma Shankar } else { 130a1596438SUma Shankar previous_block_number = blknr; 131a1596438SUma Shankar delayed_start = blknr; 132a1596438SUma Shankar delayed_extent = blockend; 133a1596438SUma Shankar delayed_skipfirst = skipfirst; 134a1596438SUma Shankar delayed_buf = buf; 135a1596438SUma Shankar delayed_next = blknr + 136a1596438SUma Shankar (blockend >> SECTOR_BITS); 137a1596438SUma Shankar } 138a1596438SUma Shankar } else { 139a1596438SUma Shankar if (previous_block_number != -1) { 140a1596438SUma Shankar /* spill */ 141a1596438SUma Shankar status = ext4fs_devread(delayed_start, 142a1596438SUma Shankar delayed_skipfirst, 143a1596438SUma Shankar delayed_extent, 144a1596438SUma Shankar delayed_buf); 145a1596438SUma Shankar if (status == 0) 146a1596438SUma Shankar return -1; 147a1596438SUma Shankar previous_block_number = -1; 148a1596438SUma Shankar } 149a1596438SUma Shankar memset(buf, 0, blocksize - skipfirst); 150a1596438SUma Shankar } 151a1596438SUma Shankar buf += blocksize - skipfirst; 152a1596438SUma Shankar } 153a1596438SUma Shankar if (previous_block_number != -1) { 154a1596438SUma Shankar /* spill */ 155a1596438SUma Shankar status = ext4fs_devread(delayed_start, 156a1596438SUma Shankar delayed_skipfirst, delayed_extent, 157a1596438SUma Shankar delayed_buf); 158a1596438SUma Shankar if (status == 0) 159a1596438SUma Shankar return -1; 160a1596438SUma Shankar previous_block_number = -1; 161a1596438SUma Shankar } 162a1596438SUma Shankar 163a1596438SUma Shankar return len; 164a1596438SUma Shankar } 165a1596438SUma Shankar 166a1596438SUma Shankar int ext4fs_ls(const char *dirname) 167a1596438SUma Shankar { 168a1596438SUma Shankar struct ext2fs_node *dirnode; 169a1596438SUma Shankar int status; 170a1596438SUma Shankar 171a1596438SUma Shankar if (dirname == NULL) 172a1596438SUma Shankar return 0; 173a1596438SUma Shankar 174a1596438SUma Shankar status = ext4fs_find_file(dirname, &ext4fs_root->diropen, &dirnode, 175a1596438SUma Shankar FILETYPE_DIRECTORY); 176a1596438SUma Shankar if (status != 1) { 177a1596438SUma Shankar printf("** Can not find directory. **\n"); 178a1596438SUma Shankar return 1; 179a1596438SUma Shankar } 180a1596438SUma Shankar 181a1596438SUma Shankar ext4fs_iterate_dir(dirnode, NULL, NULL, NULL); 182a1596438SUma Shankar ext4fs_free_node(dirnode, &ext4fs_root->diropen); 183a1596438SUma Shankar 184a1596438SUma Shankar return 0; 185a1596438SUma Shankar } 186a1596438SUma Shankar 187a1596438SUma Shankar int ext4fs_read(char *buf, unsigned len) 188a1596438SUma Shankar { 189a1596438SUma Shankar if (ext4fs_root == NULL || ext4fs_file == NULL) 190a1596438SUma Shankar return 0; 191a1596438SUma Shankar 192a1596438SUma Shankar return ext4fs_read_file(ext4fs_file, 0, len, buf); 193a1596438SUma Shankar } 194*e6d52415SSimon Glass 195*e6d52415SSimon Glass int ext4fs_probe(block_dev_desc_t *fs_dev_desc, 196*e6d52415SSimon Glass disk_partition_t *fs_partition) 197*e6d52415SSimon Glass { 198*e6d52415SSimon Glass ext4fs_set_blk_dev(fs_dev_desc, fs_partition); 199*e6d52415SSimon Glass 200*e6d52415SSimon Glass if (!ext4fs_mount(fs_partition->size)) { 201*e6d52415SSimon Glass ext4fs_close(); 202*e6d52415SSimon Glass return -1; 203*e6d52415SSimon Glass } 204*e6d52415SSimon Glass 205*e6d52415SSimon Glass return 0; 206*e6d52415SSimon Glass } 207*e6d52415SSimon Glass 208*e6d52415SSimon Glass int ext4_read_file(const char *filename, void *buf, int offset, int len) 209*e6d52415SSimon Glass { 210*e6d52415SSimon Glass int file_len; 211*e6d52415SSimon Glass int len_read; 212*e6d52415SSimon Glass 213*e6d52415SSimon Glass if (offset != 0) { 214*e6d52415SSimon Glass printf("** Cannot support non-zero offset **\n"); 215*e6d52415SSimon Glass return -1; 216*e6d52415SSimon Glass } 217*e6d52415SSimon Glass 218*e6d52415SSimon Glass file_len = ext4fs_open(filename); 219*e6d52415SSimon Glass if (file_len < 0) { 220*e6d52415SSimon Glass printf("** File not found %s **\n", filename); 221*e6d52415SSimon Glass return -1; 222*e6d52415SSimon Glass } 223*e6d52415SSimon Glass 224*e6d52415SSimon Glass if (len == 0) 225*e6d52415SSimon Glass len = file_len; 226*e6d52415SSimon Glass 227*e6d52415SSimon Glass len_read = ext4fs_read(buf, len); 228*e6d52415SSimon Glass 229*e6d52415SSimon Glass return len_read; 230*e6d52415SSimon Glass } 231