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 * ext4ls and ext4load : Based on ext2 ls and load support in Uboot. 8 * Ext4 read optimization taken from Open-Moko 9 * Qi bootloader 10 * 11 * (C) Copyright 2004 12 * esd gmbh <www.esd-electronics.com> 13 * Reinhard Arlt <reinhard.arlt@esd-electronics.com> 14 * 15 * based on code from grub2 fs/ext2.c and fs/fshelp.c by 16 * GRUB -- GRand Unified Bootloader 17 * Copyright (C) 2003, 2004 Free Software Foundation, Inc. 18 * 19 * ext4write : Based on generic ext4 protocol. 20 * 21 * This program is free software; you can redistribute it and/or modify 22 * it under the terms of the GNU General Public License as published by 23 * the Free Software Foundation; either version 2 of the License, or 24 * (at your option) any later version. 25 * 26 * This program is distributed in the hope that it will be useful, 27 * but WITHOUT ANY WARRANTY; without even the implied warranty of 28 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 29 * GNU General Public License for more details. 30 * 31 * You should have received a copy of the GNU General Public License 32 * along with this program; if not, write to the Free Software 33 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 34 */ 35 36 #include <common.h> 37 #include <ext_common.h> 38 #include <ext4fs.h> 39 #include "ext4_common.h" 40 41 int ext4fs_symlinknest; 42 struct ext_filesystem ext_fs; 43 44 struct ext_filesystem *get_fs(void) 45 { 46 return &ext_fs; 47 } 48 49 void ext4fs_free_node(struct ext2fs_node *node, struct ext2fs_node *currroot) 50 { 51 if ((node != &ext4fs_root->diropen) && (node != currroot)) 52 free(node); 53 } 54 55 /* 56 * Taken from openmoko-kernel mailing list: By Andy green 57 * Optimized read file API : collects and defers contiguous sector 58 * reads into one potentially more efficient larger sequential read action 59 */ 60 int ext4fs_read_file(struct ext2fs_node *node, int pos, 61 unsigned int len, char *buf) 62 { 63 int i; 64 int blockcnt; 65 int log2blocksize = LOG2_EXT2_BLOCK_SIZE(node->data); 66 int blocksize = 1 << (log2blocksize + DISK_SECTOR_BITS); 67 unsigned int filesize = __le32_to_cpu(node->inode.size); 68 int previous_block_number = -1; 69 int delayed_start = 0; 70 int delayed_extent = 0; 71 int delayed_skipfirst = 0; 72 int delayed_next = 0; 73 char *delayed_buf = NULL; 74 short status; 75 76 /* Adjust len so it we can't read past the end of the file. */ 77 if (len > filesize) 78 len = filesize; 79 80 blockcnt = ((len + pos) + blocksize - 1) / blocksize; 81 82 for (i = pos / blocksize; i < blockcnt; i++) { 83 int blknr; 84 int blockoff = pos % blocksize; 85 int blockend = blocksize; 86 int skipfirst = 0; 87 blknr = read_allocated_block(&(node->inode), i); 88 if (blknr < 0) 89 return -1; 90 91 blknr = blknr << log2blocksize; 92 93 /* Last block. */ 94 if (i == blockcnt - 1) { 95 blockend = (len + pos) % blocksize; 96 97 /* The last portion is exactly blocksize. */ 98 if (!blockend) 99 blockend = blocksize; 100 } 101 102 /* First block. */ 103 if (i == pos / blocksize) { 104 skipfirst = blockoff; 105 blockend -= skipfirst; 106 } 107 if (blknr) { 108 int status; 109 110 if (previous_block_number != -1) { 111 if (delayed_next == blknr) { 112 delayed_extent += blockend; 113 delayed_next += blockend >> SECTOR_BITS; 114 } else { /* spill */ 115 status = ext4fs_devread(delayed_start, 116 delayed_skipfirst, 117 delayed_extent, 118 delayed_buf); 119 if (status == 0) 120 return -1; 121 previous_block_number = blknr; 122 delayed_start = blknr; 123 delayed_extent = blockend; 124 delayed_skipfirst = skipfirst; 125 delayed_buf = buf; 126 delayed_next = blknr + 127 (blockend >> SECTOR_BITS); 128 } 129 } else { 130 previous_block_number = blknr; 131 delayed_start = blknr; 132 delayed_extent = blockend; 133 delayed_skipfirst = skipfirst; 134 delayed_buf = buf; 135 delayed_next = blknr + 136 (blockend >> SECTOR_BITS); 137 } 138 } else { 139 if (previous_block_number != -1) { 140 /* spill */ 141 status = ext4fs_devread(delayed_start, 142 delayed_skipfirst, 143 delayed_extent, 144 delayed_buf); 145 if (status == 0) 146 return -1; 147 previous_block_number = -1; 148 } 149 memset(buf, 0, blocksize - skipfirst); 150 } 151 buf += blocksize - skipfirst; 152 } 153 if (previous_block_number != -1) { 154 /* spill */ 155 status = ext4fs_devread(delayed_start, 156 delayed_skipfirst, delayed_extent, 157 delayed_buf); 158 if (status == 0) 159 return -1; 160 previous_block_number = -1; 161 } 162 163 return len; 164 } 165 166 int ext4fs_ls(const char *dirname) 167 { 168 struct ext2fs_node *dirnode; 169 int status; 170 171 if (dirname == NULL) 172 return 0; 173 174 status = ext4fs_find_file(dirname, &ext4fs_root->diropen, &dirnode, 175 FILETYPE_DIRECTORY); 176 if (status != 1) { 177 printf("** Can not find directory. **\n"); 178 return 1; 179 } 180 181 ext4fs_iterate_dir(dirnode, NULL, NULL, NULL); 182 ext4fs_free_node(dirnode, &ext4fs_root->diropen); 183 184 return 0; 185 } 186 187 int ext4fs_read(char *buf, unsigned len) 188 { 189 if (ext4fs_root == NULL || ext4fs_file == NULL) 190 return 0; 191 192 return ext4fs_read_file(ext4fs_file, 0, len, buf); 193 } 194 195 int ext4fs_probe(block_dev_desc_t *fs_dev_desc, 196 disk_partition_t *fs_partition) 197 { 198 ext4fs_set_blk_dev(fs_dev_desc, fs_partition); 199 200 if (!ext4fs_mount(fs_partition->size)) { 201 ext4fs_close(); 202 return -1; 203 } 204 205 return 0; 206 } 207 208 int ext4_read_file(const char *filename, void *buf, int offset, int len) 209 { 210 int file_len; 211 int len_read; 212 213 if (offset != 0) { 214 printf("** Cannot support non-zero offset **\n"); 215 return -1; 216 } 217 218 file_len = ext4fs_open(filename); 219 if (file_len < 0) { 220 printf("** File not found %s **\n", filename); 221 return -1; 222 } 223 224 if (len == 0) 225 len = file_len; 226 227 len_read = ext4fs_read(buf, len); 228 229 return len_read; 230 } 231