ext4fixup.c revision 671cd2188e2f224aaeac4955785199f228235719
1671cd2188e2f224aaeac4955785199f228235719Ken Sumrall/* 2671cd2188e2f224aaeac4955785199f228235719Ken Sumrall * Copyright (C) 2010 The Android Open Source Project 3671cd2188e2f224aaeac4955785199f228235719Ken Sumrall * 4671cd2188e2f224aaeac4955785199f228235719Ken Sumrall * Licensed under the Apache License, Version 2.0 (the "License"); 5671cd2188e2f224aaeac4955785199f228235719Ken Sumrall * you may not use this file except in compliance with the License. 6671cd2188e2f224aaeac4955785199f228235719Ken Sumrall * You may obtain a copy of the License at 7671cd2188e2f224aaeac4955785199f228235719Ken Sumrall * 8671cd2188e2f224aaeac4955785199f228235719Ken Sumrall * http://www.apache.org/licenses/LICENSE-2.0 9671cd2188e2f224aaeac4955785199f228235719Ken Sumrall * 10671cd2188e2f224aaeac4955785199f228235719Ken Sumrall * Unless required by applicable law or agreed to in writing, software 11671cd2188e2f224aaeac4955785199f228235719Ken Sumrall * distributed under the License is distributed on an "AS IS" BASIS, 12671cd2188e2f224aaeac4955785199f228235719Ken Sumrall * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13671cd2188e2f224aaeac4955785199f228235719Ken Sumrall * See the License for the specific language governing permissions and 14671cd2188e2f224aaeac4955785199f228235719Ken Sumrall * limitations under the License. 15671cd2188e2f224aaeac4955785199f228235719Ken Sumrall */ 16671cd2188e2f224aaeac4955785199f228235719Ken Sumrall#include "ext4_utils.h" 17671cd2188e2f224aaeac4955785199f228235719Ken Sumrall#include "make_ext4fs.h" 18671cd2188e2f224aaeac4955785199f228235719Ken Sumrall#include "ext4_extents.h" 19671cd2188e2f224aaeac4955785199f228235719Ken Sumrall#include "output_file.h" 20671cd2188e2f224aaeac4955785199f228235719Ken Sumrall#include "backed_block.h" 21671cd2188e2f224aaeac4955785199f228235719Ken Sumrall#include "allocate.h" 22671cd2188e2f224aaeac4955785199f228235719Ken Sumrall#include "ext4fixup.h" 23671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 24671cd2188e2f224aaeac4955785199f228235719Ken Sumrall#include <sys/types.h> 25671cd2188e2f224aaeac4955785199f228235719Ken Sumrall#include <sys/stat.h> 26671cd2188e2f224aaeac4955785199f228235719Ken Sumrall#include <sys/types.h> 27671cd2188e2f224aaeac4955785199f228235719Ken Sumrall#include <sys/mman.h> 28671cd2188e2f224aaeac4955785199f228235719Ken Sumrall#include <fcntl.h> 29671cd2188e2f224aaeac4955785199f228235719Ken Sumrall#include <unistd.h> 30671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 31671cd2188e2f224aaeac4955785199f228235719Ken Sumrall#if defined(__APPLE__) && defined(__MACH__) 32671cd2188e2f224aaeac4955785199f228235719Ken Sumrall#define lseek64 lseek 33671cd2188e2f224aaeac4955785199f228235719Ken Sumrall#define off64_t off_t 34671cd2188e2f224aaeac4955785199f228235719Ken Sumrall#endif 35671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 36671cd2188e2f224aaeac4955785199f228235719Ken Sumrall/* The inode block count for a file/directory is in units of 512 byte blocks, 37671cd2188e2f224aaeac4955785199f228235719Ken Sumrall * _NOT_ the filesystem block size! 38671cd2188e2f224aaeac4955785199f228235719Ken Sumrall */ 39671cd2188e2f224aaeac4955785199f228235719Ken Sumrall#define INODE_BLOCK_SIZE 512 40671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 41671cd2188e2f224aaeac4955785199f228235719Ken Sumrall#define MAX_EXT4_BLOCK_SIZE 4096 42671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 43671cd2188e2f224aaeac4955785199f228235719Ken Sumrall/* The two modes the recurse_dir() can be in */ 44671cd2188e2f224aaeac4955785199f228235719Ken Sumrall#define SANITY_CHECK_PASS 1 45671cd2188e2f224aaeac4955785199f228235719Ken Sumrall#define MARK_INODE_NUMS 2 46671cd2188e2f224aaeac4955785199f228235719Ken Sumrall#define UPDATE_INODE_NUMS 3 47671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 48671cd2188e2f224aaeac4955785199f228235719Ken Sumrall/* Magic numbers to indicate what state the update process is in */ 49671cd2188e2f224aaeac4955785199f228235719Ken Sumrall#define MAGIC_STATE_MARKING_INUMS 0x7000151515565512ll 50671cd2188e2f224aaeac4955785199f228235719Ken Sumrall#define MAGIC_STATE_UPDATING_INUMS 0x6121131211735123ll 51671cd2188e2f224aaeac4955785199f228235719Ken Sumrall#define MAGIC_STATE_UPDATING_SB 0x15e1715151558477ll 52671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 53671cd2188e2f224aaeac4955785199f228235719Ken Sumrall/* Internal state variables corresponding to the magic numbers */ 54671cd2188e2f224aaeac4955785199f228235719Ken Sumrall#define STATE_UNSET 0 55671cd2188e2f224aaeac4955785199f228235719Ken Sumrall#define STATE_MARKING_INUMS 1 56671cd2188e2f224aaeac4955785199f228235719Ken Sumrall#define STATE_UPDATING_INUMS 2 57671cd2188e2f224aaeac4955785199f228235719Ken Sumrall#define STATE_UPDATING_SB 3 58671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 59671cd2188e2f224aaeac4955785199f228235719Ken Sumrallstatic int verbose = 0; 60671cd2188e2f224aaeac4955785199f228235719Ken Sumrallstatic int no_write = 0; 61671cd2188e2f224aaeac4955785199f228235719Ken Sumrallstatic int new_inodes_per_group = 0; 62671cd2188e2f224aaeac4955785199f228235719Ken Sumrallstatic int no_write_fixup_state = 0; 63671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 64671cd2188e2f224aaeac4955785199f228235719Ken Sumrallstatic int compute_new_inum(unsigned int old_inum) 65671cd2188e2f224aaeac4955785199f228235719Ken Sumrall{ 66671cd2188e2f224aaeac4955785199f228235719Ken Sumrall unsigned int group, offset; 67671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 68671cd2188e2f224aaeac4955785199f228235719Ken Sumrall group = old_inum / info.inodes_per_group; 69671cd2188e2f224aaeac4955785199f228235719Ken Sumrall offset = old_inum % info.inodes_per_group; 70671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 71671cd2188e2f224aaeac4955785199f228235719Ken Sumrall return (group * new_inodes_per_group) + offset; 72671cd2188e2f224aaeac4955785199f228235719Ken Sumrall} 73671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 74671cd2188e2f224aaeac4955785199f228235719Ken Sumrall/* Function to read the primary superblock */ 75671cd2188e2f224aaeac4955785199f228235719Ken Sumrallstatic void read_sb(int fd, struct ext4_super_block *sb) 76671cd2188e2f224aaeac4955785199f228235719Ken Sumrall{ 77671cd2188e2f224aaeac4955785199f228235719Ken Sumrall off64_t ret; 78671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 79671cd2188e2f224aaeac4955785199f228235719Ken Sumrall ret = lseek64(fd, 1024, SEEK_SET); 80671cd2188e2f224aaeac4955785199f228235719Ken Sumrall if (ret < 0) 81671cd2188e2f224aaeac4955785199f228235719Ken Sumrall critical_error_errno("failed to seek to superblock"); 82671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 83671cd2188e2f224aaeac4955785199f228235719Ken Sumrall ret = read(fd, sb, sizeof(*sb)); 84671cd2188e2f224aaeac4955785199f228235719Ken Sumrall if (ret < 0) 85671cd2188e2f224aaeac4955785199f228235719Ken Sumrall critical_error_errno("failed to read superblock"); 86671cd2188e2f224aaeac4955785199f228235719Ken Sumrall if (ret != sizeof(*sb)) 87671cd2188e2f224aaeac4955785199f228235719Ken Sumrall critical_error("failed to read all of superblock"); 88671cd2188e2f224aaeac4955785199f228235719Ken Sumrall} 89671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 90671cd2188e2f224aaeac4955785199f228235719Ken Sumrall/* Function to write a primary or backup superblock at a given offset */ 91671cd2188e2f224aaeac4955785199f228235719Ken Sumrallstatic void write_sb(int fd, unsigned long long offset, struct ext4_super_block *sb) 92671cd2188e2f224aaeac4955785199f228235719Ken Sumrall{ 93671cd2188e2f224aaeac4955785199f228235719Ken Sumrall off64_t ret; 94671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 95671cd2188e2f224aaeac4955785199f228235719Ken Sumrall if (no_write) { 96671cd2188e2f224aaeac4955785199f228235719Ken Sumrall return; 97671cd2188e2f224aaeac4955785199f228235719Ken Sumrall } 98671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 99671cd2188e2f224aaeac4955785199f228235719Ken Sumrall ret = lseek64(fd, offset, SEEK_SET); 100671cd2188e2f224aaeac4955785199f228235719Ken Sumrall if (ret < 0) 101671cd2188e2f224aaeac4955785199f228235719Ken Sumrall critical_error_errno("failed to seek to superblock"); 102671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 103671cd2188e2f224aaeac4955785199f228235719Ken Sumrall ret = write(fd, sb, sizeof(*sb)); 104671cd2188e2f224aaeac4955785199f228235719Ken Sumrall if (ret < 0) 105671cd2188e2f224aaeac4955785199f228235719Ken Sumrall critical_error_errno("failed to write superblock"); 106671cd2188e2f224aaeac4955785199f228235719Ken Sumrall if (ret != sizeof(*sb)) 107671cd2188e2f224aaeac4955785199f228235719Ken Sumrall critical_error("failed to write all of superblock"); 108671cd2188e2f224aaeac4955785199f228235719Ken Sumrall} 109671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 110671cd2188e2f224aaeac4955785199f228235719Ken Sumrallstatic int get_fs_fixup_state(int fd) 111671cd2188e2f224aaeac4955785199f228235719Ken Sumrall{ 112671cd2188e2f224aaeac4955785199f228235719Ken Sumrall unsigned long long magic; 113671cd2188e2f224aaeac4955785199f228235719Ken Sumrall int ret, len; 114671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 115671cd2188e2f224aaeac4955785199f228235719Ken Sumrall if (no_write) { 116671cd2188e2f224aaeac4955785199f228235719Ken Sumrall return no_write_fixup_state; 117671cd2188e2f224aaeac4955785199f228235719Ken Sumrall } 118671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 119671cd2188e2f224aaeac4955785199f228235719Ken Sumrall lseek64(fd, 0, SEEK_SET); 120671cd2188e2f224aaeac4955785199f228235719Ken Sumrall len = read(fd, &magic, sizeof(magic)); 121671cd2188e2f224aaeac4955785199f228235719Ken Sumrall if (len != sizeof(magic)) { 122671cd2188e2f224aaeac4955785199f228235719Ken Sumrall critical_error("cannot read fixup_state\n"); 123671cd2188e2f224aaeac4955785199f228235719Ken Sumrall } 124671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 125671cd2188e2f224aaeac4955785199f228235719Ken Sumrall switch (magic) { 126671cd2188e2f224aaeac4955785199f228235719Ken Sumrall case MAGIC_STATE_MARKING_INUMS: 127671cd2188e2f224aaeac4955785199f228235719Ken Sumrall ret = STATE_MARKING_INUMS; 128671cd2188e2f224aaeac4955785199f228235719Ken Sumrall break; 129671cd2188e2f224aaeac4955785199f228235719Ken Sumrall case MAGIC_STATE_UPDATING_INUMS: 130671cd2188e2f224aaeac4955785199f228235719Ken Sumrall ret = STATE_UPDATING_INUMS; 131671cd2188e2f224aaeac4955785199f228235719Ken Sumrall break; 132671cd2188e2f224aaeac4955785199f228235719Ken Sumrall case MAGIC_STATE_UPDATING_SB: 133671cd2188e2f224aaeac4955785199f228235719Ken Sumrall ret = STATE_UPDATING_SB; 134671cd2188e2f224aaeac4955785199f228235719Ken Sumrall break; 135671cd2188e2f224aaeac4955785199f228235719Ken Sumrall default: 136671cd2188e2f224aaeac4955785199f228235719Ken Sumrall ret = STATE_UNSET; 137671cd2188e2f224aaeac4955785199f228235719Ken Sumrall } 138671cd2188e2f224aaeac4955785199f228235719Ken Sumrall return ret; 139671cd2188e2f224aaeac4955785199f228235719Ken Sumrall} 140671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 141671cd2188e2f224aaeac4955785199f228235719Ken Sumrallstatic int set_fs_fixup_state(int fd, int state) 142671cd2188e2f224aaeac4955785199f228235719Ken Sumrall{ 143671cd2188e2f224aaeac4955785199f228235719Ken Sumrall unsigned long long magic; 144671cd2188e2f224aaeac4955785199f228235719Ken Sumrall struct ext4_super_block sb; 145671cd2188e2f224aaeac4955785199f228235719Ken Sumrall int len; 146671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 147671cd2188e2f224aaeac4955785199f228235719Ken Sumrall if (no_write) { 148671cd2188e2f224aaeac4955785199f228235719Ken Sumrall no_write_fixup_state = state; 149671cd2188e2f224aaeac4955785199f228235719Ken Sumrall return 0; 150671cd2188e2f224aaeac4955785199f228235719Ken Sumrall } 151671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 152671cd2188e2f224aaeac4955785199f228235719Ken Sumrall switch (state) { 153671cd2188e2f224aaeac4955785199f228235719Ken Sumrall case STATE_MARKING_INUMS: 154671cd2188e2f224aaeac4955785199f228235719Ken Sumrall magic = MAGIC_STATE_MARKING_INUMS; 155671cd2188e2f224aaeac4955785199f228235719Ken Sumrall break; 156671cd2188e2f224aaeac4955785199f228235719Ken Sumrall case STATE_UPDATING_INUMS: 157671cd2188e2f224aaeac4955785199f228235719Ken Sumrall magic = MAGIC_STATE_UPDATING_INUMS; 158671cd2188e2f224aaeac4955785199f228235719Ken Sumrall break; 159671cd2188e2f224aaeac4955785199f228235719Ken Sumrall case STATE_UPDATING_SB: 160671cd2188e2f224aaeac4955785199f228235719Ken Sumrall magic = MAGIC_STATE_UPDATING_SB; 161671cd2188e2f224aaeac4955785199f228235719Ken Sumrall break; 162671cd2188e2f224aaeac4955785199f228235719Ken Sumrall case STATE_UNSET: 163671cd2188e2f224aaeac4955785199f228235719Ken Sumrall default: 164671cd2188e2f224aaeac4955785199f228235719Ken Sumrall magic = 0ll; 165671cd2188e2f224aaeac4955785199f228235719Ken Sumrall break; 166671cd2188e2f224aaeac4955785199f228235719Ken Sumrall } 167671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 168671cd2188e2f224aaeac4955785199f228235719Ken Sumrall lseek64(fd, 0, SEEK_SET); 169671cd2188e2f224aaeac4955785199f228235719Ken Sumrall len = write(fd, &magic, sizeof(magic)); 170671cd2188e2f224aaeac4955785199f228235719Ken Sumrall if (len != sizeof(magic)) { 171671cd2188e2f224aaeac4955785199f228235719Ken Sumrall critical_error("cannot write fixup_state\n"); 172671cd2188e2f224aaeac4955785199f228235719Ken Sumrall } 173671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 174671cd2188e2f224aaeac4955785199f228235719Ken Sumrall read_sb(fd, &sb); 175671cd2188e2f224aaeac4955785199f228235719Ken Sumrall if (magic) { 176671cd2188e2f224aaeac4955785199f228235719Ken Sumrall /* If we are in the process of updating the filesystem, make it unmountable */ 177671cd2188e2f224aaeac4955785199f228235719Ken Sumrall sb.s_desc_size |= 1; 178671cd2188e2f224aaeac4955785199f228235719Ken Sumrall } else { 179671cd2188e2f224aaeac4955785199f228235719Ken Sumrall /* we are done, so make the filesystem mountable again */ 180671cd2188e2f224aaeac4955785199f228235719Ken Sumrall sb.s_desc_size &= ~1; 181671cd2188e2f224aaeac4955785199f228235719Ken Sumrall } 182671cd2188e2f224aaeac4955785199f228235719Ken Sumrall write_sb(fd, 1024, &sb); 183671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 184671cd2188e2f224aaeac4955785199f228235719Ken Sumrall return 0; 185671cd2188e2f224aaeac4955785199f228235719Ken Sumrall} 186671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 187671cd2188e2f224aaeac4955785199f228235719Ken Sumrallstatic int read_ext(int fd) 188671cd2188e2f224aaeac4955785199f228235719Ken Sumrall{ 189671cd2188e2f224aaeac4955785199f228235719Ken Sumrall off64_t ret; 190671cd2188e2f224aaeac4955785199f228235719Ken Sumrall struct ext4_super_block sb; 191671cd2188e2f224aaeac4955785199f228235719Ken Sumrall unsigned int i; 192671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 193671cd2188e2f224aaeac4955785199f228235719Ken Sumrall read_sb(fd, &sb); 194671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 195671cd2188e2f224aaeac4955785199f228235719Ken Sumrall ext4_parse_sb(&sb); 196671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 197671cd2188e2f224aaeac4955785199f228235719Ken Sumrall /* Clear the low bit which is set while this tool is in progress. 198671cd2188e2f224aaeac4955785199f228235719Ken Sumrall * If the tool crashes, it will still be set when we restart. 199671cd2188e2f224aaeac4955785199f228235719Ken Sumrall * The low bit is set to make the filesystem unmountable while 200671cd2188e2f224aaeac4955785199f228235719Ken Sumrall * it is being fixed up. Also allow 0, which means the old ext2 201671cd2188e2f224aaeac4955785199f228235719Ken Sumrall * size is in use. 202671cd2188e2f224aaeac4955785199f228235719Ken Sumrall */ 203671cd2188e2f224aaeac4955785199f228235719Ken Sumrall if (((sb.s_desc_size & ~1) != sizeof(struct ext2_group_desc)) && 204671cd2188e2f224aaeac4955785199f228235719Ken Sumrall ((sb.s_desc_size & ~1) != 0)) 205671cd2188e2f224aaeac4955785199f228235719Ken Sumrall critical_error("error: bg_desc_size != sizeof(struct ext2_group_desc)\n"); 206671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 207671cd2188e2f224aaeac4955785199f228235719Ken Sumrall ret = lseek64(fd, info.len, SEEK_SET); 208671cd2188e2f224aaeac4955785199f228235719Ken Sumrall if (ret < 0) 209671cd2188e2f224aaeac4955785199f228235719Ken Sumrall critical_error_errno("failed to seek to end of input image"); 210671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 211671cd2188e2f224aaeac4955785199f228235719Ken Sumrall ret = lseek64(fd, info.block_size * (aux_info.first_data_block + 1), SEEK_SET); 212671cd2188e2f224aaeac4955785199f228235719Ken Sumrall if (ret < 0) 213671cd2188e2f224aaeac4955785199f228235719Ken Sumrall critical_error_errno("failed to seek to block group descriptors"); 214671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 215671cd2188e2f224aaeac4955785199f228235719Ken Sumrall ret = read(fd, aux_info.bg_desc, info.block_size * aux_info.bg_desc_blocks); 216671cd2188e2f224aaeac4955785199f228235719Ken Sumrall if (ret < 0) 217671cd2188e2f224aaeac4955785199f228235719Ken Sumrall critical_error_errno("failed to read block group descriptors"); 218671cd2188e2f224aaeac4955785199f228235719Ken Sumrall if (ret != (int)info.block_size * (int)aux_info.bg_desc_blocks) 219671cd2188e2f224aaeac4955785199f228235719Ken Sumrall critical_error("failed to read all of block group descriptors"); 220671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 221671cd2188e2f224aaeac4955785199f228235719Ken Sumrall if (verbose) { 222671cd2188e2f224aaeac4955785199f228235719Ken Sumrall printf("Found filesystem with parameters:\n"); 223671cd2188e2f224aaeac4955785199f228235719Ken Sumrall printf(" Size: %llu\n", info.len); 224671cd2188e2f224aaeac4955785199f228235719Ken Sumrall printf(" Block size: %d\n", info.block_size); 225671cd2188e2f224aaeac4955785199f228235719Ken Sumrall printf(" Blocks per group: %d\n", info.blocks_per_group); 226671cd2188e2f224aaeac4955785199f228235719Ken Sumrall printf(" Inodes per group: %d\n", info.inodes_per_group); 227671cd2188e2f224aaeac4955785199f228235719Ken Sumrall printf(" Inode size: %d\n", info.inode_size); 228671cd2188e2f224aaeac4955785199f228235719Ken Sumrall printf(" Label: %s\n", info.label); 229671cd2188e2f224aaeac4955785199f228235719Ken Sumrall printf(" Blocks: %llu\n", aux_info.len_blocks); 230671cd2188e2f224aaeac4955785199f228235719Ken Sumrall printf(" Block groups: %d\n", aux_info.groups); 231671cd2188e2f224aaeac4955785199f228235719Ken Sumrall printf(" Reserved block group size: %d\n", info.bg_desc_reserve_blocks); 232671cd2188e2f224aaeac4955785199f228235719Ken Sumrall printf(" Used %d/%d inodes and %d/%d blocks\n", 233671cd2188e2f224aaeac4955785199f228235719Ken Sumrall aux_info.sb->s_inodes_count - aux_info.sb->s_free_inodes_count, 234671cd2188e2f224aaeac4955785199f228235719Ken Sumrall aux_info.sb->s_inodes_count, 235671cd2188e2f224aaeac4955785199f228235719Ken Sumrall aux_info.sb->s_blocks_count_lo - aux_info.sb->s_free_blocks_count_lo, 236671cd2188e2f224aaeac4955785199f228235719Ken Sumrall aux_info.sb->s_blocks_count_lo); 237671cd2188e2f224aaeac4955785199f228235719Ken Sumrall } 238671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 239671cd2188e2f224aaeac4955785199f228235719Ken Sumrall return 0; 240671cd2188e2f224aaeac4955785199f228235719Ken Sumrall} 241671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 242671cd2188e2f224aaeac4955785199f228235719Ken Sumrallstatic int read_inode(int fd, unsigned int inum, struct ext4_inode *inode) 243671cd2188e2f224aaeac4955785199f228235719Ken Sumrall{ 244671cd2188e2f224aaeac4955785199f228235719Ken Sumrall unsigned int bg_num, bg_offset; 245671cd2188e2f224aaeac4955785199f228235719Ken Sumrall off64_t inode_offset; 246671cd2188e2f224aaeac4955785199f228235719Ken Sumrall int len; 247671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 248671cd2188e2f224aaeac4955785199f228235719Ken Sumrall bg_num = (inum-1) / info.inodes_per_group; 249671cd2188e2f224aaeac4955785199f228235719Ken Sumrall bg_offset = (inum-1) % info.inodes_per_group; 250671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 251671cd2188e2f224aaeac4955785199f228235719Ken Sumrall inode_offset = ((unsigned long long)aux_info.bg_desc[bg_num].bg_inode_table * info.block_size) + 252671cd2188e2f224aaeac4955785199f228235719Ken Sumrall (bg_offset * info.inode_size); 253671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 254671cd2188e2f224aaeac4955785199f228235719Ken Sumrall if (lseek64(fd, inode_offset, SEEK_SET) < 0) { 255671cd2188e2f224aaeac4955785199f228235719Ken Sumrall critical_error_errno("failed to seek to inode %d\n", inum); 256671cd2188e2f224aaeac4955785199f228235719Ken Sumrall } 257671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 258671cd2188e2f224aaeac4955785199f228235719Ken Sumrall len=read(fd, inode, sizeof(*inode)); 259671cd2188e2f224aaeac4955785199f228235719Ken Sumrall if (len != sizeof(*inode)) { 260671cd2188e2f224aaeac4955785199f228235719Ken Sumrall critical_error_errno("failed to read inode %d\n", inum); 261671cd2188e2f224aaeac4955785199f228235719Ken Sumrall } 262671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 263671cd2188e2f224aaeac4955785199f228235719Ken Sumrall return 0; 264671cd2188e2f224aaeac4955785199f228235719Ken Sumrall} 265671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 266671cd2188e2f224aaeac4955785199f228235719Ken Sumrallstatic int read_block(int fd, unsigned long long block_num, void *block) 267671cd2188e2f224aaeac4955785199f228235719Ken Sumrall{ 268671cd2188e2f224aaeac4955785199f228235719Ken Sumrall off64_t off; 269671cd2188e2f224aaeac4955785199f228235719Ken Sumrall unsigned int len; 270671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 271671cd2188e2f224aaeac4955785199f228235719Ken Sumrall off = block_num * info.block_size; 272671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 273671cd2188e2f224aaeac4955785199f228235719Ken Sumrall if (lseek64(fd, off, SEEK_SET) , 0) { 274671cd2188e2f224aaeac4955785199f228235719Ken Sumrall critical_error_errno("failed to seek to block %lld\n", block_num); 275671cd2188e2f224aaeac4955785199f228235719Ken Sumrall } 276671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 277671cd2188e2f224aaeac4955785199f228235719Ken Sumrall len=read(fd, block, info.block_size); 278671cd2188e2f224aaeac4955785199f228235719Ken Sumrall if (len != info.block_size) { 279671cd2188e2f224aaeac4955785199f228235719Ken Sumrall critical_error_errno("failed to read block %lld\n", block_num); 280671cd2188e2f224aaeac4955785199f228235719Ken Sumrall } 281671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 282671cd2188e2f224aaeac4955785199f228235719Ken Sumrall return 0; 283671cd2188e2f224aaeac4955785199f228235719Ken Sumrall} 284671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 285671cd2188e2f224aaeac4955785199f228235719Ken Sumrallstatic int write_block(int fd, unsigned long long block_num, void *block) 286671cd2188e2f224aaeac4955785199f228235719Ken Sumrall{ 287671cd2188e2f224aaeac4955785199f228235719Ken Sumrall off64_t off; 288671cd2188e2f224aaeac4955785199f228235719Ken Sumrall unsigned int len; 289671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 290671cd2188e2f224aaeac4955785199f228235719Ken Sumrall if (no_write) { 291671cd2188e2f224aaeac4955785199f228235719Ken Sumrall return 0; 292671cd2188e2f224aaeac4955785199f228235719Ken Sumrall } 293671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 294671cd2188e2f224aaeac4955785199f228235719Ken Sumrall off = block_num * info.block_size; 295671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 296671cd2188e2f224aaeac4955785199f228235719Ken Sumrall if (lseek64(fd, off, SEEK_SET) < 0) { 297671cd2188e2f224aaeac4955785199f228235719Ken Sumrall critical_error_errno("failed to seek to block %lld\n", block_num); 298671cd2188e2f224aaeac4955785199f228235719Ken Sumrall } 299671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 300671cd2188e2f224aaeac4955785199f228235719Ken Sumrall len=write(fd, block, info.block_size); 301671cd2188e2f224aaeac4955785199f228235719Ken Sumrall if (len != info.block_size) { 302671cd2188e2f224aaeac4955785199f228235719Ken Sumrall critical_error_errno("failed to write block %lld\n", block_num); 303671cd2188e2f224aaeac4955785199f228235719Ken Sumrall } 304671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 305671cd2188e2f224aaeac4955785199f228235719Ken Sumrall return 0; 306671cd2188e2f224aaeac4955785199f228235719Ken Sumrall} 307671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 308671cd2188e2f224aaeac4955785199f228235719Ken Sumrallstatic int bitmap_get_bit(u8 *bitmap, u32 bit) 309671cd2188e2f224aaeac4955785199f228235719Ken Sumrall{ 310671cd2188e2f224aaeac4955785199f228235719Ken Sumrall if (bitmap[bit / 8] & (1 << (bit % 8))) 311671cd2188e2f224aaeac4955785199f228235719Ken Sumrall return 1; 312671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 313671cd2188e2f224aaeac4955785199f228235719Ken Sumrall return 0; 314671cd2188e2f224aaeac4955785199f228235719Ken Sumrall} 315671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 316671cd2188e2f224aaeac4955785199f228235719Ken Sumrallstatic void bitmap_clear_bit(u8 *bitmap, u32 bit) 317671cd2188e2f224aaeac4955785199f228235719Ken Sumrall{ 318671cd2188e2f224aaeac4955785199f228235719Ken Sumrall bitmap[bit / 8] &= ~(1 << (bit % 8)); 319671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 320671cd2188e2f224aaeac4955785199f228235719Ken Sumrall return; 321671cd2188e2f224aaeac4955785199f228235719Ken Sumrall} 322671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 323671cd2188e2f224aaeac4955785199f228235719Ken Sumrallstatic void check_inode_bitmap(int fd, unsigned int bg_num) 324671cd2188e2f224aaeac4955785199f228235719Ken Sumrall{ 325671cd2188e2f224aaeac4955785199f228235719Ken Sumrall unsigned int inode_bitmap_block_num; 326671cd2188e2f224aaeac4955785199f228235719Ken Sumrall unsigned char block[MAX_EXT4_BLOCK_SIZE]; 327671cd2188e2f224aaeac4955785199f228235719Ken Sumrall int i, bitmap_updated = 0; 328671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 329671cd2188e2f224aaeac4955785199f228235719Ken Sumrall /* Using the bg_num, aux_info.bg_desc[], info.inodes_per_group and 330671cd2188e2f224aaeac4955785199f228235719Ken Sumrall * new_inodes_per_group, retrieve the inode bitmap, and make sure 331671cd2188e2f224aaeac4955785199f228235719Ken Sumrall * the bits between the old and new size are clear 332671cd2188e2f224aaeac4955785199f228235719Ken Sumrall */ 333671cd2188e2f224aaeac4955785199f228235719Ken Sumrall inode_bitmap_block_num = aux_info.bg_desc[bg_num].bg_inode_bitmap; 334671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 335671cd2188e2f224aaeac4955785199f228235719Ken Sumrall read_block(fd, inode_bitmap_block_num, block); 336671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 337671cd2188e2f224aaeac4955785199f228235719Ken Sumrall for (i = info.inodes_per_group; i < new_inodes_per_group; i++) { 338671cd2188e2f224aaeac4955785199f228235719Ken Sumrall if (bitmap_get_bit(block, i)) { 339671cd2188e2f224aaeac4955785199f228235719Ken Sumrall bitmap_clear_bit(block, i); 340671cd2188e2f224aaeac4955785199f228235719Ken Sumrall bitmap_updated = 1; 341671cd2188e2f224aaeac4955785199f228235719Ken Sumrall } 342671cd2188e2f224aaeac4955785199f228235719Ken Sumrall } 343671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 344671cd2188e2f224aaeac4955785199f228235719Ken Sumrall if (bitmap_updated) { 345671cd2188e2f224aaeac4955785199f228235719Ken Sumrall if (verbose) { 346671cd2188e2f224aaeac4955785199f228235719Ken Sumrall printf("Warning: updated inode bitmap for block group %d\n", bg_num); 347671cd2188e2f224aaeac4955785199f228235719Ken Sumrall } 348671cd2188e2f224aaeac4955785199f228235719Ken Sumrall write_block(fd, inode_bitmap_block_num, block); 349671cd2188e2f224aaeac4955785199f228235719Ken Sumrall } 350671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 351671cd2188e2f224aaeac4955785199f228235719Ken Sumrall return; 352671cd2188e2f224aaeac4955785199f228235719Ken Sumrall} 353671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 354671cd2188e2f224aaeac4955785199f228235719Ken Sumrall/* Update the superblock and bgdesc of the specified block group */ 355671cd2188e2f224aaeac4955785199f228235719Ken Sumrallstatic int update_superblocks_and_bg_desc(int fd, int state) 356671cd2188e2f224aaeac4955785199f228235719Ken Sumrall{ 357671cd2188e2f224aaeac4955785199f228235719Ken Sumrall off64_t ret; 358671cd2188e2f224aaeac4955785199f228235719Ken Sumrall struct ext4_super_block sb; 359671cd2188e2f224aaeac4955785199f228235719Ken Sumrall unsigned int num_block_groups, total_new_inodes; 360671cd2188e2f224aaeac4955785199f228235719Ken Sumrall unsigned int i; 361671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 362671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 363671cd2188e2f224aaeac4955785199f228235719Ken Sumrall read_sb(fd, &sb); 364671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 365671cd2188e2f224aaeac4955785199f228235719Ken Sumrall /* Compute how many more inodes are now available */ 366671cd2188e2f224aaeac4955785199f228235719Ken Sumrall num_block_groups = DIV_ROUND_UP(aux_info.len_blocks, info.blocks_per_group); 367671cd2188e2f224aaeac4955785199f228235719Ken Sumrall total_new_inodes = num_block_groups * (new_inodes_per_group - sb.s_inodes_per_group); 368671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 369671cd2188e2f224aaeac4955785199f228235719Ken Sumrall if (verbose) { 370671cd2188e2f224aaeac4955785199f228235719Ken Sumrall printf("created %d additional inodes\n", total_new_inodes); 371671cd2188e2f224aaeac4955785199f228235719Ken Sumrall } 372671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 373671cd2188e2f224aaeac4955785199f228235719Ken Sumrall /* Update the free inodes count in each block group descriptor */ 374671cd2188e2f224aaeac4955785199f228235719Ken Sumrall for (i = 0; i < num_block_groups; i++) { 375671cd2188e2f224aaeac4955785199f228235719Ken Sumrall if (state == STATE_UPDATING_SB) { 376671cd2188e2f224aaeac4955785199f228235719Ken Sumrall aux_info.bg_desc[i].bg_free_inodes_count += (new_inodes_per_group - sb.s_inodes_per_group); 377671cd2188e2f224aaeac4955785199f228235719Ken Sumrall } 378671cd2188e2f224aaeac4955785199f228235719Ken Sumrall check_inode_bitmap(fd, i); 379671cd2188e2f224aaeac4955785199f228235719Ken Sumrall } 380671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 381671cd2188e2f224aaeac4955785199f228235719Ken Sumrall /* First some sanity checks */ 382671cd2188e2f224aaeac4955785199f228235719Ken Sumrall if ((sb.s_inodes_count + total_new_inodes) != (new_inodes_per_group * num_block_groups)) { 383671cd2188e2f224aaeac4955785199f228235719Ken Sumrall critical_error("Failed sanity check on new inode count\n"); 384671cd2188e2f224aaeac4955785199f228235719Ken Sumrall } 385671cd2188e2f224aaeac4955785199f228235719Ken Sumrall if (new_inodes_per_group % (info.block_size/info.inode_size)) { 386671cd2188e2f224aaeac4955785199f228235719Ken Sumrall critical_error("Failed sanity check on new inode per group alignment\n"); 387671cd2188e2f224aaeac4955785199f228235719Ken Sumrall } 388671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 389671cd2188e2f224aaeac4955785199f228235719Ken Sumrall /* Update the free inodes count in the superblock */ 390671cd2188e2f224aaeac4955785199f228235719Ken Sumrall sb.s_inodes_count += total_new_inodes; 391671cd2188e2f224aaeac4955785199f228235719Ken Sumrall sb.s_free_inodes_count += total_new_inodes; 392671cd2188e2f224aaeac4955785199f228235719Ken Sumrall sb.s_inodes_per_group = new_inodes_per_group; 393671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 394671cd2188e2f224aaeac4955785199f228235719Ken Sumrall for (i = 0; i < aux_info.groups; i++) { 395671cd2188e2f224aaeac4955785199f228235719Ken Sumrall if (ext4_bg_has_super_block(i)) { 396671cd2188e2f224aaeac4955785199f228235719Ken Sumrall unsigned int sb_offset; 397671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 398671cd2188e2f224aaeac4955785199f228235719Ken Sumrall if (i == 0) { 399671cd2188e2f224aaeac4955785199f228235719Ken Sumrall /* The first superblock is offset by 1K to leave room for boot sectors */ 400671cd2188e2f224aaeac4955785199f228235719Ken Sumrall sb_offset = 1024; 401671cd2188e2f224aaeac4955785199f228235719Ken Sumrall } else { 402671cd2188e2f224aaeac4955785199f228235719Ken Sumrall sb_offset = 0; 403671cd2188e2f224aaeac4955785199f228235719Ken Sumrall } 404671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 405671cd2188e2f224aaeac4955785199f228235719Ken Sumrall sb.s_block_group_nr = i; 406671cd2188e2f224aaeac4955785199f228235719Ken Sumrall /* Don't write out the backup superblocks with the bit set in the s_desc_size 407671cd2188e2f224aaeac4955785199f228235719Ken Sumrall * which prevents the filesystem from mounting. The bit for the primary 408671cd2188e2f224aaeac4955785199f228235719Ken Sumrall * superblock will be cleared on the final call to set_fs_fixup_state() */ 409671cd2188e2f224aaeac4955785199f228235719Ken Sumrall if (i != 0) { 410671cd2188e2f224aaeac4955785199f228235719Ken Sumrall sb.s_desc_size &= ~1; 411671cd2188e2f224aaeac4955785199f228235719Ken Sumrall } 412671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 413671cd2188e2f224aaeac4955785199f228235719Ken Sumrall write_sb(fd, (unsigned long long)i * info.blocks_per_group * info.block_size + sb_offset, &sb); 414671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 415671cd2188e2f224aaeac4955785199f228235719Ken Sumrall ret = lseek64(fd, ((unsigned long long)i * info.blocks_per_group * info.block_size) + 416671cd2188e2f224aaeac4955785199f228235719Ken Sumrall (info.block_size * (aux_info.first_data_block + 1)), SEEK_SET); 417671cd2188e2f224aaeac4955785199f228235719Ken Sumrall if (ret < 0) 418671cd2188e2f224aaeac4955785199f228235719Ken Sumrall critical_error_errno("failed to seek to block group descriptors"); 419671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 420671cd2188e2f224aaeac4955785199f228235719Ken Sumrall if (!no_write) { 421671cd2188e2f224aaeac4955785199f228235719Ken Sumrall ret = write(fd, aux_info.bg_desc, info.block_size * aux_info.bg_desc_blocks); 422671cd2188e2f224aaeac4955785199f228235719Ken Sumrall if (ret < 0) 423671cd2188e2f224aaeac4955785199f228235719Ken Sumrall critical_error_errno("failed to write block group descriptors"); 424671cd2188e2f224aaeac4955785199f228235719Ken Sumrall if (ret != (int)info.block_size * (int)aux_info.bg_desc_blocks) 425671cd2188e2f224aaeac4955785199f228235719Ken Sumrall critical_error("failed to write all of block group descriptors"); 426671cd2188e2f224aaeac4955785199f228235719Ken Sumrall } 427671cd2188e2f224aaeac4955785199f228235719Ken Sumrall } 428671cd2188e2f224aaeac4955785199f228235719Ken Sumrall } 429671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 430671cd2188e2f224aaeac4955785199f228235719Ken Sumrall return 0; 431671cd2188e2f224aaeac4955785199f228235719Ken Sumrall} 432671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 433671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 434671cd2188e2f224aaeac4955785199f228235719Ken Sumrallstatic int get_direct_blocks(struct ext4_inode *inode, unsigned long long *block_list, 435671cd2188e2f224aaeac4955785199f228235719Ken Sumrall unsigned int *count) 436671cd2188e2f224aaeac4955785199f228235719Ken Sumrall{ 437671cd2188e2f224aaeac4955785199f228235719Ken Sumrall unsigned int i = 0; 438671cd2188e2f224aaeac4955785199f228235719Ken Sumrall unsigned int ret = 0; 439671cd2188e2f224aaeac4955785199f228235719Ken Sumrall unsigned int sectors_per_block; 440671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 441671cd2188e2f224aaeac4955785199f228235719Ken Sumrall sectors_per_block = info.block_size / INODE_BLOCK_SIZE; 442671cd2188e2f224aaeac4955785199f228235719Ken Sumrall while ((i < (inode->i_blocks_lo / sectors_per_block)) && (i < EXT4_NDIR_BLOCKS)) { 443671cd2188e2f224aaeac4955785199f228235719Ken Sumrall block_list[i] = inode->i_block[i]; 444671cd2188e2f224aaeac4955785199f228235719Ken Sumrall i++; 445671cd2188e2f224aaeac4955785199f228235719Ken Sumrall } 446671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 447671cd2188e2f224aaeac4955785199f228235719Ken Sumrall *count += i; 448671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 449671cd2188e2f224aaeac4955785199f228235719Ken Sumrall if ((inode->i_blocks_lo / sectors_per_block) > EXT4_NDIR_BLOCKS) { 450671cd2188e2f224aaeac4955785199f228235719Ken Sumrall ret = 1; 451671cd2188e2f224aaeac4955785199f228235719Ken Sumrall } 452671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 453671cd2188e2f224aaeac4955785199f228235719Ken Sumrall return ret; 454671cd2188e2f224aaeac4955785199f228235719Ken Sumrall} 455671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 456671cd2188e2f224aaeac4955785199f228235719Ken Sumrallstatic int get_indirect_blocks(int fd, struct ext4_inode *inode, 457671cd2188e2f224aaeac4955785199f228235719Ken Sumrall unsigned long long *block_list, unsigned int *count) 458671cd2188e2f224aaeac4955785199f228235719Ken Sumrall{ 459671cd2188e2f224aaeac4955785199f228235719Ken Sumrall unsigned int i; 460671cd2188e2f224aaeac4955785199f228235719Ken Sumrall unsigned int *indirect_block; 461671cd2188e2f224aaeac4955785199f228235719Ken Sumrall unsigned int sectors_per_block; 462671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 463671cd2188e2f224aaeac4955785199f228235719Ken Sumrall sectors_per_block = info.block_size / INODE_BLOCK_SIZE; 464671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 465671cd2188e2f224aaeac4955785199f228235719Ken Sumrall indirect_block = (unsigned int *)malloc(info.block_size); 466671cd2188e2f224aaeac4955785199f228235719Ken Sumrall if (indirect_block == 0) { 467671cd2188e2f224aaeac4955785199f228235719Ken Sumrall critical_error("failed to allocate memory for indirect_block\n"); 468671cd2188e2f224aaeac4955785199f228235719Ken Sumrall } 469671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 470671cd2188e2f224aaeac4955785199f228235719Ken Sumrall read_block(fd, inode->i_block[EXT4_NDIR_BLOCKS], indirect_block); 471671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 472671cd2188e2f224aaeac4955785199f228235719Ken Sumrall for(i = 0; i < (inode->i_blocks_lo / sectors_per_block - EXT4_NDIR_BLOCKS); i++) { 473671cd2188e2f224aaeac4955785199f228235719Ken Sumrall block_list[EXT4_NDIR_BLOCKS+i] = indirect_block[i]; 474671cd2188e2f224aaeac4955785199f228235719Ken Sumrall } 475671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 476671cd2188e2f224aaeac4955785199f228235719Ken Sumrall *count += i; 477671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 478671cd2188e2f224aaeac4955785199f228235719Ken Sumrall free(indirect_block); 479671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 480671cd2188e2f224aaeac4955785199f228235719Ken Sumrall return 0; 481671cd2188e2f224aaeac4955785199f228235719Ken Sumrall} 482671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 483671cd2188e2f224aaeac4955785199f228235719Ken Sumrallstatic int get_block_list_indirect(int fd, struct ext4_inode *inode, unsigned long long *block_list) 484671cd2188e2f224aaeac4955785199f228235719Ken Sumrall{ 485671cd2188e2f224aaeac4955785199f228235719Ken Sumrall unsigned int count=0; 486671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 487671cd2188e2f224aaeac4955785199f228235719Ken Sumrall if (get_direct_blocks(inode, block_list, &count)) { 488671cd2188e2f224aaeac4955785199f228235719Ken Sumrall get_indirect_blocks(fd, inode, block_list, &count); 489671cd2188e2f224aaeac4955785199f228235719Ken Sumrall } 490671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 491671cd2188e2f224aaeac4955785199f228235719Ken Sumrall return count; 492671cd2188e2f224aaeac4955785199f228235719Ken Sumrall} 493671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 494671cd2188e2f224aaeac4955785199f228235719Ken Sumrallstatic int get_extent_ents(int fd, struct ext4_extent_header *ext_hdr, unsigned long long *block_list) 495671cd2188e2f224aaeac4955785199f228235719Ken Sumrall{ 496671cd2188e2f224aaeac4955785199f228235719Ken Sumrall int i, j; 497671cd2188e2f224aaeac4955785199f228235719Ken Sumrall struct ext4_extent *extent; 498671cd2188e2f224aaeac4955785199f228235719Ken Sumrall off64_t fs_block_num; 499671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 500671cd2188e2f224aaeac4955785199f228235719Ken Sumrall if (ext_hdr->eh_depth != 0) { 501671cd2188e2f224aaeac4955785199f228235719Ken Sumrall critical_error("get_extent_ents called with eh_depth != 0\n"); 502671cd2188e2f224aaeac4955785199f228235719Ken Sumrall } 503671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 504671cd2188e2f224aaeac4955785199f228235719Ken Sumrall /* The extent entries immediately follow the header, so add 1 to the pointer 505671cd2188e2f224aaeac4955785199f228235719Ken Sumrall * and cast it to an extent pointer. 506671cd2188e2f224aaeac4955785199f228235719Ken Sumrall */ 507671cd2188e2f224aaeac4955785199f228235719Ken Sumrall extent = (struct ext4_extent *)(ext_hdr + 1); 508671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 509671cd2188e2f224aaeac4955785199f228235719Ken Sumrall for (i = 0; i < ext_hdr->eh_entries; i++) { 510671cd2188e2f224aaeac4955785199f228235719Ken Sumrall fs_block_num = ((off64_t)extent->ee_start_hi << 32) | extent->ee_start_lo; 511671cd2188e2f224aaeac4955785199f228235719Ken Sumrall for (j = 0; j < extent->ee_len; j++) { 512671cd2188e2f224aaeac4955785199f228235719Ken Sumrall block_list[extent->ee_block+j] = fs_block_num+j; 513671cd2188e2f224aaeac4955785199f228235719Ken Sumrall } 514671cd2188e2f224aaeac4955785199f228235719Ken Sumrall extent++; 515671cd2188e2f224aaeac4955785199f228235719Ken Sumrall } 516671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 517671cd2188e2f224aaeac4955785199f228235719Ken Sumrall return 0; 518671cd2188e2f224aaeac4955785199f228235719Ken Sumrall} 519671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 520671cd2188e2f224aaeac4955785199f228235719Ken Sumrallstatic int get_extent_idx(int fd, struct ext4_extent_header *ext_hdr, unsigned long long *block_list) 521671cd2188e2f224aaeac4955785199f228235719Ken Sumrall{ 522671cd2188e2f224aaeac4955785199f228235719Ken Sumrall int i; 523671cd2188e2f224aaeac4955785199f228235719Ken Sumrall struct ext4_extent_idx *extent_idx; 524671cd2188e2f224aaeac4955785199f228235719Ken Sumrall struct ext4_extent_header *tmp_ext_hdr; 525671cd2188e2f224aaeac4955785199f228235719Ken Sumrall off64_t fs_block_num; 526671cd2188e2f224aaeac4955785199f228235719Ken Sumrall unsigned char block[MAX_EXT4_BLOCK_SIZE]; 527671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 528671cd2188e2f224aaeac4955785199f228235719Ken Sumrall /* Sanity check */ 529671cd2188e2f224aaeac4955785199f228235719Ken Sumrall if (ext_hdr->eh_depth == 0) { 530671cd2188e2f224aaeac4955785199f228235719Ken Sumrall critical_error("get_extent_idx called with eh_depth == 0\n"); 531671cd2188e2f224aaeac4955785199f228235719Ken Sumrall } 532671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 533671cd2188e2f224aaeac4955785199f228235719Ken Sumrall /* The extent entries immediately follow the header, so add 1 to the pointer 534671cd2188e2f224aaeac4955785199f228235719Ken Sumrall * and cast it to an extent pointer. 535671cd2188e2f224aaeac4955785199f228235719Ken Sumrall */ 536671cd2188e2f224aaeac4955785199f228235719Ken Sumrall extent_idx = (struct ext4_extent_idx *)(ext_hdr + 1); 537671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 538671cd2188e2f224aaeac4955785199f228235719Ken Sumrall for (i = 0; i < ext_hdr->eh_entries; i++) { 539671cd2188e2f224aaeac4955785199f228235719Ken Sumrall fs_block_num = ((off64_t)extent_idx->ei_leaf_hi << 32) | extent_idx->ei_leaf_lo; 540671cd2188e2f224aaeac4955785199f228235719Ken Sumrall read_block(fd, fs_block_num, block); 541671cd2188e2f224aaeac4955785199f228235719Ken Sumrall tmp_ext_hdr = (struct ext4_extent_header *)block; 542671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 543671cd2188e2f224aaeac4955785199f228235719Ken Sumrall if (tmp_ext_hdr->eh_depth == 0) { 544671cd2188e2f224aaeac4955785199f228235719Ken Sumrall get_extent_ents(fd, tmp_ext_hdr, block_list); /* leaf node, fill in block_list */ 545671cd2188e2f224aaeac4955785199f228235719Ken Sumrall } else { 546671cd2188e2f224aaeac4955785199f228235719Ken Sumrall get_extent_idx(fd, tmp_ext_hdr, block_list); /* recurse down the tree */ 547671cd2188e2f224aaeac4955785199f228235719Ken Sumrall } 548671cd2188e2f224aaeac4955785199f228235719Ken Sumrall } 549671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 550671cd2188e2f224aaeac4955785199f228235719Ken Sumrall return 0; 551671cd2188e2f224aaeac4955785199f228235719Ken Sumrall} 552671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 553671cd2188e2f224aaeac4955785199f228235719Ken Sumrallstatic int get_block_list_extents(int fd, struct ext4_inode *inode, unsigned long long *block_list) 554671cd2188e2f224aaeac4955785199f228235719Ken Sumrall{ 555671cd2188e2f224aaeac4955785199f228235719Ken Sumrall struct ext4_extent_header *extent_hdr; 556671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 557671cd2188e2f224aaeac4955785199f228235719Ken Sumrall extent_hdr = (struct ext4_extent_header *)inode->i_block; 558671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 559671cd2188e2f224aaeac4955785199f228235719Ken Sumrall if (extent_hdr->eh_magic != EXT4_EXT_MAGIC) { 560671cd2188e2f224aaeac4955785199f228235719Ken Sumrall critical_error("extent header has unexpected magic value 0x%4.4x\n", 561671cd2188e2f224aaeac4955785199f228235719Ken Sumrall extent_hdr->eh_magic); 562671cd2188e2f224aaeac4955785199f228235719Ken Sumrall } 563671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 564671cd2188e2f224aaeac4955785199f228235719Ken Sumrall if (extent_hdr->eh_depth == 0) { 565671cd2188e2f224aaeac4955785199f228235719Ken Sumrall get_extent_ents(fd, (struct ext4_extent_header *)inode->i_block, block_list); 566671cd2188e2f224aaeac4955785199f228235719Ken Sumrall return 0; 567671cd2188e2f224aaeac4955785199f228235719Ken Sumrall } 568671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 569671cd2188e2f224aaeac4955785199f228235719Ken Sumrall get_extent_idx(fd, (struct ext4_extent_header *)inode->i_block, block_list); 570671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 571671cd2188e2f224aaeac4955785199f228235719Ken Sumrall return 0; 572671cd2188e2f224aaeac4955785199f228235719Ken Sumrall} 573671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 574671cd2188e2f224aaeac4955785199f228235719Ken Sumrallstatic int is_entry_dir(int fd, struct ext4_dir_entry_2 *dirp, int pass) 575671cd2188e2f224aaeac4955785199f228235719Ken Sumrall{ 576671cd2188e2f224aaeac4955785199f228235719Ken Sumrall struct ext4_inode inode; 577671cd2188e2f224aaeac4955785199f228235719Ken Sumrall int ret = 0; 578671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 579671cd2188e2f224aaeac4955785199f228235719Ken Sumrall if (dirp->file_type == EXT4_FT_DIR) { 580671cd2188e2f224aaeac4955785199f228235719Ken Sumrall ret = 1; 581671cd2188e2f224aaeac4955785199f228235719Ken Sumrall } else if (dirp->file_type == EXT4_FT_UNKNOWN) { 582671cd2188e2f224aaeac4955785199f228235719Ken Sumrall /* Somebody was too lazy to fill in the dir entry, 583671cd2188e2f224aaeac4955785199f228235719Ken Sumrall * so we have to go fetch it from the inode. Grrr. 584671cd2188e2f224aaeac4955785199f228235719Ken Sumrall */ 585671cd2188e2f224aaeac4955785199f228235719Ken Sumrall /* if UPDATE_INODE_NUMS pass and the inode high bit is not 586671cd2188e2f224aaeac4955785199f228235719Ken Sumrall * set return false so we don't recurse down the tree that is 587671cd2188e2f224aaeac4955785199f228235719Ken Sumrall * already updated. Otherwise, fetch inode, and return answer. 588671cd2188e2f224aaeac4955785199f228235719Ken Sumrall */ 589671cd2188e2f224aaeac4955785199f228235719Ken Sumrall if ((pass == UPDATE_INODE_NUMS) && !(dirp->inode & 0x80000000)) { 590671cd2188e2f224aaeac4955785199f228235719Ken Sumrall ret = 0; 591671cd2188e2f224aaeac4955785199f228235719Ken Sumrall } else { 592671cd2188e2f224aaeac4955785199f228235719Ken Sumrall read_inode(fd, (dirp->inode & 0x7fffffff), &inode); 593671cd2188e2f224aaeac4955785199f228235719Ken Sumrall if (S_ISDIR(inode.i_mode)) { 594671cd2188e2f224aaeac4955785199f228235719Ken Sumrall ret = 1; 595671cd2188e2f224aaeac4955785199f228235719Ken Sumrall } 596671cd2188e2f224aaeac4955785199f228235719Ken Sumrall } 597671cd2188e2f224aaeac4955785199f228235719Ken Sumrall } 598671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 599671cd2188e2f224aaeac4955785199f228235719Ken Sumrall return ret; 600671cd2188e2f224aaeac4955785199f228235719Ken Sumrall} 601671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 602671cd2188e2f224aaeac4955785199f228235719Ken Sumrallstatic int recurse_dir(int fd, struct ext4_inode *inode, char *dirbuf, int dirsize, int mode) 603671cd2188e2f224aaeac4955785199f228235719Ken Sumrall{ 604671cd2188e2f224aaeac4955785199f228235719Ken Sumrall unsigned long long *block_list; 605671cd2188e2f224aaeac4955785199f228235719Ken Sumrall unsigned int num_blocks; 606671cd2188e2f224aaeac4955785199f228235719Ken Sumrall struct ext4_dir_entry_2 *dirp, *prev_dirp = 0; 607671cd2188e2f224aaeac4955785199f228235719Ken Sumrall char name[256]; 608671cd2188e2f224aaeac4955785199f228235719Ken Sumrall unsigned int i, leftover_space, is_dir; 609671cd2188e2f224aaeac4955785199f228235719Ken Sumrall struct ext4_inode tmp_inode; 610671cd2188e2f224aaeac4955785199f228235719Ken Sumrall int tmp_dirsize; 611671cd2188e2f224aaeac4955785199f228235719Ken Sumrall char *tmp_dirbuf; 612671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 613671cd2188e2f224aaeac4955785199f228235719Ken Sumrall switch (mode) { 614671cd2188e2f224aaeac4955785199f228235719Ken Sumrall case SANITY_CHECK_PASS: 615671cd2188e2f224aaeac4955785199f228235719Ken Sumrall case MARK_INODE_NUMS: 616671cd2188e2f224aaeac4955785199f228235719Ken Sumrall case UPDATE_INODE_NUMS: 617671cd2188e2f224aaeac4955785199f228235719Ken Sumrall break; 618671cd2188e2f224aaeac4955785199f228235719Ken Sumrall default: 619671cd2188e2f224aaeac4955785199f228235719Ken Sumrall critical_error("recurse_dir() called witn unknown mode!\n"); 620671cd2188e2f224aaeac4955785199f228235719Ken Sumrall } 621671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 622671cd2188e2f224aaeac4955785199f228235719Ken Sumrall if (dirsize % info.block_size) { 623671cd2188e2f224aaeac4955785199f228235719Ken Sumrall critical_error("dirsize %d not a multiple of block_size %d. This is unexpected!\n", 624671cd2188e2f224aaeac4955785199f228235719Ken Sumrall dirsize, info.block_size); 625671cd2188e2f224aaeac4955785199f228235719Ken Sumrall } 626671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 627671cd2188e2f224aaeac4955785199f228235719Ken Sumrall num_blocks = dirsize / info.block_size; 628671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 629671cd2188e2f224aaeac4955785199f228235719Ken Sumrall block_list = malloc((num_blocks + 1) * sizeof(*block_list)); 630671cd2188e2f224aaeac4955785199f228235719Ken Sumrall if (block_list == 0) { 631671cd2188e2f224aaeac4955785199f228235719Ken Sumrall critical_error("failed to allocate memory for block_list\n"); 632671cd2188e2f224aaeac4955785199f228235719Ken Sumrall } 633671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 634671cd2188e2f224aaeac4955785199f228235719Ken Sumrall if (inode->i_flags & EXT4_EXTENTS_FL) { 635671cd2188e2f224aaeac4955785199f228235719Ken Sumrall get_block_list_extents(fd, inode, block_list); 636671cd2188e2f224aaeac4955785199f228235719Ken Sumrall } else { 637671cd2188e2f224aaeac4955785199f228235719Ken Sumrall /* A directory that requires doubly or triply indirect blocks in huge indeed, 638671cd2188e2f224aaeac4955785199f228235719Ken Sumrall * and will almost certainly not exist, especially since make_ext4fs only creates 639671cd2188e2f224aaeac4955785199f228235719Ken Sumrall * directories with extents, and the kernel will too, but check to make sure the 640671cd2188e2f224aaeac4955785199f228235719Ken Sumrall * directory is not that big and give an error if so. Our limit is 12 direct blocks, 641671cd2188e2f224aaeac4955785199f228235719Ken Sumrall * plus block_size/4 singly indirect blocks, which for a filesystem with 4K blocks 642671cd2188e2f224aaeac4955785199f228235719Ken Sumrall * is a directory 1036 blocks long, or 4,243,456 bytes long! Assuming an average 643671cd2188e2f224aaeac4955785199f228235719Ken Sumrall * filename length of 20 (which I think is generous) thats 20 + 8 bytes overhead 644671cd2188e2f224aaeac4955785199f228235719Ken Sumrall * per entry, or 151,552 entries in the directory! 645671cd2188e2f224aaeac4955785199f228235719Ken Sumrall */ 646671cd2188e2f224aaeac4955785199f228235719Ken Sumrall if (num_blocks > (info.block_size / 4 + EXT4_NDIR_BLOCKS)) { 647671cd2188e2f224aaeac4955785199f228235719Ken Sumrall critical_error("Non-extent based directory is too big!\n"); 648671cd2188e2f224aaeac4955785199f228235719Ken Sumrall } 649671cd2188e2f224aaeac4955785199f228235719Ken Sumrall get_block_list_indirect(fd, inode, block_list); 650671cd2188e2f224aaeac4955785199f228235719Ken Sumrall } 651671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 652671cd2188e2f224aaeac4955785199f228235719Ken Sumrall /* Read in all the blocks for this directory */ 653671cd2188e2f224aaeac4955785199f228235719Ken Sumrall for (i = 0; i < num_blocks; i++) { 654671cd2188e2f224aaeac4955785199f228235719Ken Sumrall read_block(fd, block_list[i], dirbuf + (i * info.block_size)); 655671cd2188e2f224aaeac4955785199f228235719Ken Sumrall } 656671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 657671cd2188e2f224aaeac4955785199f228235719Ken Sumrall dirp = (struct ext4_dir_entry_2 *)dirbuf; 658671cd2188e2f224aaeac4955785199f228235719Ken Sumrall while (dirp < (struct ext4_dir_entry_2 *)(dirbuf + dirsize)) { 659671cd2188e2f224aaeac4955785199f228235719Ken Sumrall leftover_space = (char *)(dirbuf + dirsize) - (char *)dirp; 660671cd2188e2f224aaeac4955785199f228235719Ken Sumrall if (((mode == SANITY_CHECK_PASS) || (mode == UPDATE_INODE_NUMS)) && 661671cd2188e2f224aaeac4955785199f228235719Ken Sumrall (leftover_space <= 8) && prev_dirp) { 662671cd2188e2f224aaeac4955785199f228235719Ken Sumrall /* This is a bug in an older version of make_ext4fs, where it 663671cd2188e2f224aaeac4955785199f228235719Ken Sumrall * didn't properly include the rest of the block in rec_len. 664671cd2188e2f224aaeac4955785199f228235719Ken Sumrall * Update rec_len on the previous entry to include the rest of 665671cd2188e2f224aaeac4955785199f228235719Ken Sumrall * the block and exit the loop. 666671cd2188e2f224aaeac4955785199f228235719Ken Sumrall */ 667671cd2188e2f224aaeac4955785199f228235719Ken Sumrall if (verbose) { 668671cd2188e2f224aaeac4955785199f228235719Ken Sumrall printf("fixing up short rec_len for diretory entry for %s\n", name); 669671cd2188e2f224aaeac4955785199f228235719Ken Sumrall } 670671cd2188e2f224aaeac4955785199f228235719Ken Sumrall prev_dirp->rec_len += leftover_space; 671671cd2188e2f224aaeac4955785199f228235719Ken Sumrall break; 672671cd2188e2f224aaeac4955785199f228235719Ken Sumrall } 673671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 674671cd2188e2f224aaeac4955785199f228235719Ken Sumrall if (dirp->inode == 0) { 675671cd2188e2f224aaeac4955785199f228235719Ken Sumrall /* This is the last entry in the directory */ 676671cd2188e2f224aaeac4955785199f228235719Ken Sumrall break; 677671cd2188e2f224aaeac4955785199f228235719Ken Sumrall } 678671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 679671cd2188e2f224aaeac4955785199f228235719Ken Sumrall strncpy(name, dirp->name, dirp->name_len); 680671cd2188e2f224aaeac4955785199f228235719Ken Sumrall name[dirp->name_len]='\0'; 681671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 682671cd2188e2f224aaeac4955785199f228235719Ken Sumrall /* Only recurse on pass 2 if the high bit is set. 683671cd2188e2f224aaeac4955785199f228235719Ken Sumrall * Otherwise, this inode entry has already been updated 684671cd2188e2f224aaeac4955785199f228235719Ken Sumrall * and we'll do the wrong thing. Also don't recurse on . or .., 685671cd2188e2f224aaeac4955785199f228235719Ken Sumrall * and certainly not on non-directories! 686671cd2188e2f224aaeac4955785199f228235719Ken Sumrall */ 687671cd2188e2f224aaeac4955785199f228235719Ken Sumrall /* Hrm, looks like filesystems made by fastboot on stingray set the file_type 688671cd2188e2f224aaeac4955785199f228235719Ken Sumrall * flag, but the lost+found directory has the type set to Unknown, which 689671cd2188e2f224aaeac4955785199f228235719Ken Sumrall * seems to imply I need to read the inode and get it. 690671cd2188e2f224aaeac4955785199f228235719Ken Sumrall */ 691671cd2188e2f224aaeac4955785199f228235719Ken Sumrall is_dir = is_entry_dir(fd, dirp, mode); 692671cd2188e2f224aaeac4955785199f228235719Ken Sumrall if ( is_dir && (strcmp(name, ".") && strcmp(name, "..")) && 693671cd2188e2f224aaeac4955785199f228235719Ken Sumrall ((mode == SANITY_CHECK_PASS) || (mode == MARK_INODE_NUMS) || 694671cd2188e2f224aaeac4955785199f228235719Ken Sumrall ((mode == UPDATE_INODE_NUMS) && (dirp->inode | 0x80000000))) ) { 695671cd2188e2f224aaeac4955785199f228235719Ken Sumrall /* A directory! Recurse! */ 696671cd2188e2f224aaeac4955785199f228235719Ken Sumrall read_inode(fd, dirp->inode & 0x7fffffff, &tmp_inode); 697671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 698671cd2188e2f224aaeac4955785199f228235719Ken Sumrall if (!S_ISDIR(tmp_inode.i_mode)) { 699671cd2188e2f224aaeac4955785199f228235719Ken Sumrall critical_error("inode %d for name %s does not point to a directory\n", 700671cd2188e2f224aaeac4955785199f228235719Ken Sumrall dirp->inode & 0x7fffffff, name); 701671cd2188e2f224aaeac4955785199f228235719Ken Sumrall } 702671cd2188e2f224aaeac4955785199f228235719Ken Sumrall if (verbose) { 703671cd2188e2f224aaeac4955785199f228235719Ken Sumrall printf("inode %d %s use extents\n", dirp->inode & 0x7fffffff, 704671cd2188e2f224aaeac4955785199f228235719Ken Sumrall (tmp_inode.i_flags & EXT4_EXTENTS_FL) ? "does" : "does not"); 705671cd2188e2f224aaeac4955785199f228235719Ken Sumrall } 706671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 707671cd2188e2f224aaeac4955785199f228235719Ken Sumrall tmp_dirsize = tmp_inode.i_blocks_lo * INODE_BLOCK_SIZE; 708671cd2188e2f224aaeac4955785199f228235719Ken Sumrall if (verbose) { 709671cd2188e2f224aaeac4955785199f228235719Ken Sumrall printf("dir size = %d bytes\n", tmp_dirsize); 710671cd2188e2f224aaeac4955785199f228235719Ken Sumrall } 711671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 712671cd2188e2f224aaeac4955785199f228235719Ken Sumrall tmp_dirbuf = malloc(tmp_dirsize); 713671cd2188e2f224aaeac4955785199f228235719Ken Sumrall if (tmp_dirbuf == 0) { 714671cd2188e2f224aaeac4955785199f228235719Ken Sumrall critical_error("failed to allocate memory for tmp_dirbuf\n"); 715671cd2188e2f224aaeac4955785199f228235719Ken Sumrall } 716671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 717671cd2188e2f224aaeac4955785199f228235719Ken Sumrall recurse_dir(fd, &tmp_inode, tmp_dirbuf, tmp_dirsize, mode); 718671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 719671cd2188e2f224aaeac4955785199f228235719Ken Sumrall free(tmp_dirbuf); 720671cd2188e2f224aaeac4955785199f228235719Ken Sumrall } 721671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 722671cd2188e2f224aaeac4955785199f228235719Ken Sumrall if (verbose) { 723671cd2188e2f224aaeac4955785199f228235719Ken Sumrall if (is_dir) { 724671cd2188e2f224aaeac4955785199f228235719Ken Sumrall printf("Directory %s\n", name); 725671cd2188e2f224aaeac4955785199f228235719Ken Sumrall } else { 726671cd2188e2f224aaeac4955785199f228235719Ken Sumrall printf("Non-directory %s\n", name); 727671cd2188e2f224aaeac4955785199f228235719Ken Sumrall } 728671cd2188e2f224aaeac4955785199f228235719Ken Sumrall } 729671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 730671cd2188e2f224aaeac4955785199f228235719Ken Sumrall /* Process entry based on current mode. Either set high bit or change inode number */ 731671cd2188e2f224aaeac4955785199f228235719Ken Sumrall if (mode == MARK_INODE_NUMS) { 732671cd2188e2f224aaeac4955785199f228235719Ken Sumrall dirp->inode |= 0x80000000; 733671cd2188e2f224aaeac4955785199f228235719Ken Sumrall } else if (mode == UPDATE_INODE_NUMS) { 734671cd2188e2f224aaeac4955785199f228235719Ken Sumrall if (dirp->inode | 0x80000000) { 735671cd2188e2f224aaeac4955785199f228235719Ken Sumrall dirp->inode = compute_new_inum(dirp->inode & 0x7fffffff); 736671cd2188e2f224aaeac4955785199f228235719Ken Sumrall } 737671cd2188e2f224aaeac4955785199f228235719Ken Sumrall } 738671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 739671cd2188e2f224aaeac4955785199f228235719Ken Sumrall /* Point dirp at the next entry */ 740671cd2188e2f224aaeac4955785199f228235719Ken Sumrall prev_dirp = dirp; 741671cd2188e2f224aaeac4955785199f228235719Ken Sumrall dirp = (struct ext4_dir_entry_2*)((char *)dirp + dirp->rec_len); 742671cd2188e2f224aaeac4955785199f228235719Ken Sumrall } 743671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 744671cd2188e2f224aaeac4955785199f228235719Ken Sumrall /* Write out all the blocks for this directory */ 745671cd2188e2f224aaeac4955785199f228235719Ken Sumrall for (i = 0; i < num_blocks; i++) { 746671cd2188e2f224aaeac4955785199f228235719Ken Sumrall write_block(fd, block_list[i], dirbuf + (i * info.block_size)); 747671cd2188e2f224aaeac4955785199f228235719Ken Sumrall } 748671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 749671cd2188e2f224aaeac4955785199f228235719Ken Sumrall free(block_list); 750671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 751671cd2188e2f224aaeac4955785199f228235719Ken Sumrall return 0; 752671cd2188e2f224aaeac4955785199f228235719Ken Sumrall} 753671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 754671cd2188e2f224aaeac4955785199f228235719Ken Sumrallint ext4fixup(char *fsdev) 755671cd2188e2f224aaeac4955785199f228235719Ken Sumrall{ 756671cd2188e2f224aaeac4955785199f228235719Ken Sumrall return ext4fixup_internal(fsdev, 0, 0); 757671cd2188e2f224aaeac4955785199f228235719Ken Sumrall} 758671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 759671cd2188e2f224aaeac4955785199f228235719Ken Sumrallint ext4fixup_internal(char *fsdev, int v_flag, int n_flag) 760671cd2188e2f224aaeac4955785199f228235719Ken Sumrall{ 761671cd2188e2f224aaeac4955785199f228235719Ken Sumrall int fd; 762671cd2188e2f224aaeac4955785199f228235719Ken Sumrall struct ext4_inode root_inode; 763671cd2188e2f224aaeac4955785199f228235719Ken Sumrall unsigned int dirsize; 764671cd2188e2f224aaeac4955785199f228235719Ken Sumrall char *dirbuf; 765671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 766671cd2188e2f224aaeac4955785199f228235719Ken Sumrall if (setjmp(setjmp_env)) 767671cd2188e2f224aaeac4955785199f228235719Ken Sumrall return EXIT_FAILURE; /* Handle a call to longjmp() */ 768671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 769671cd2188e2f224aaeac4955785199f228235719Ken Sumrall verbose = v_flag; 770671cd2188e2f224aaeac4955785199f228235719Ken Sumrall no_write = n_flag; 771671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 772671cd2188e2f224aaeac4955785199f228235719Ken Sumrall fd = open(fsdev, O_RDWR); 773671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 774671cd2188e2f224aaeac4955785199f228235719Ken Sumrall if (fd < 0) 775671cd2188e2f224aaeac4955785199f228235719Ken Sumrall critical_error_errno("failed to open filesystem image"); 776671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 777671cd2188e2f224aaeac4955785199f228235719Ken Sumrall read_ext(fd); 778671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 779671cd2188e2f224aaeac4955785199f228235719Ken Sumrall if ((info.feat_incompat & EXT4_FEATURE_INCOMPAT_FILETYPE) == 0) { 780671cd2188e2f224aaeac4955785199f228235719Ken Sumrall critical_error("Expected filesystem to have filetype flag set\n"); 781671cd2188e2f224aaeac4955785199f228235719Ken Sumrall } 782671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 783671cd2188e2f224aaeac4955785199f228235719Ken Sumrall#if 0 // If we have to fix the directory rec_len issue, we can't use this check 784671cd2188e2f224aaeac4955785199f228235719Ken Sumrall /* Check to see if the inodes/group is copacetic */ 785671cd2188e2f224aaeac4955785199f228235719Ken Sumrall if (info.inodes_per_blockgroup % (info.block_size/info.inode_size) == 0) { 786671cd2188e2f224aaeac4955785199f228235719Ken Sumrall /* This filesystem has either already been updated, or was 787671cd2188e2f224aaeac4955785199f228235719Ken Sumrall * made correctly. 788671cd2188e2f224aaeac4955785199f228235719Ken Sumrall */ 789671cd2188e2f224aaeac4955785199f228235719Ken Sumrall if (verbose) { 790671cd2188e2f224aaeac4955785199f228235719Ken Sumrall printf("%s: filesystem correct, no work to do\n", me); 791671cd2188e2f224aaeac4955785199f228235719Ken Sumrall } 792671cd2188e2f224aaeac4955785199f228235719Ken Sumrall exit(0); 793671cd2188e2f224aaeac4955785199f228235719Ken Sumrall } 794671cd2188e2f224aaeac4955785199f228235719Ken Sumrall#endif 795671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 796671cd2188e2f224aaeac4955785199f228235719Ken Sumrall /* Compute what the new value of inodes_per_blockgroup will be when we're done */ 797671cd2188e2f224aaeac4955785199f228235719Ken Sumrall new_inodes_per_group=ALIGN(info.inodes_per_group,(info.block_size/info.inode_size)); 798671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 799671cd2188e2f224aaeac4955785199f228235719Ken Sumrall read_inode(fd, EXT4_ROOT_INO, &root_inode); 800671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 801671cd2188e2f224aaeac4955785199f228235719Ken Sumrall if (!S_ISDIR(root_inode.i_mode)) { 802671cd2188e2f224aaeac4955785199f228235719Ken Sumrall critical_error("root inode %d does not point to a directory\n", EXT4_ROOT_INO); 803671cd2188e2f224aaeac4955785199f228235719Ken Sumrall } 804671cd2188e2f224aaeac4955785199f228235719Ken Sumrall if (verbose) { 805671cd2188e2f224aaeac4955785199f228235719Ken Sumrall printf("inode %d %s use extents\n", EXT4_ROOT_INO, 806671cd2188e2f224aaeac4955785199f228235719Ken Sumrall (root_inode.i_flags & EXT4_EXTENTS_FL) ? "does" : "does not"); 807671cd2188e2f224aaeac4955785199f228235719Ken Sumrall } 808671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 809671cd2188e2f224aaeac4955785199f228235719Ken Sumrall dirsize = root_inode.i_blocks_lo * INODE_BLOCK_SIZE; 810671cd2188e2f224aaeac4955785199f228235719Ken Sumrall if (verbose) { 811671cd2188e2f224aaeac4955785199f228235719Ken Sumrall printf("root dir size = %d bytes\n", dirsize); 812671cd2188e2f224aaeac4955785199f228235719Ken Sumrall } 813671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 814671cd2188e2f224aaeac4955785199f228235719Ken Sumrall dirbuf = malloc(dirsize); 815671cd2188e2f224aaeac4955785199f228235719Ken Sumrall if (dirbuf == 0) { 816671cd2188e2f224aaeac4955785199f228235719Ken Sumrall critical_error("failed to allocate memory for dirbuf\n"); 817671cd2188e2f224aaeac4955785199f228235719Ken Sumrall } 818671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 819671cd2188e2f224aaeac4955785199f228235719Ken Sumrall /* Perform a sanity check pass first, try to catch any errors that will occur 820671cd2188e2f224aaeac4955785199f228235719Ken Sumrall * before we actually change anything, so we don't leave a filesystem in a 821671cd2188e2f224aaeac4955785199f228235719Ken Sumrall * corrupted, unrecoverable state. Set no_write, make it quiet, and do a recurse 822671cd2188e2f224aaeac4955785199f228235719Ken Sumrall * pass and a update_superblock pass. Set flags back to requested state when done. 823671cd2188e2f224aaeac4955785199f228235719Ken Sumrall */ 824671cd2188e2f224aaeac4955785199f228235719Ken Sumrall verbose = 0; 825671cd2188e2f224aaeac4955785199f228235719Ken Sumrall no_write = 1; 826671cd2188e2f224aaeac4955785199f228235719Ken Sumrall recurse_dir(fd, &root_inode, dirbuf, dirsize, SANITY_CHECK_PASS); 827671cd2188e2f224aaeac4955785199f228235719Ken Sumrall update_superblocks_and_bg_desc(fd, STATE_UNSET); 828671cd2188e2f224aaeac4955785199f228235719Ken Sumrall verbose = v_flag; 829671cd2188e2f224aaeac4955785199f228235719Ken Sumrall no_write = n_flag; 830671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 831671cd2188e2f224aaeac4955785199f228235719Ken Sumrall if (get_fs_fixup_state(fd) == STATE_UNSET) { 832671cd2188e2f224aaeac4955785199f228235719Ken Sumrall set_fs_fixup_state(fd, STATE_MARKING_INUMS); 833671cd2188e2f224aaeac4955785199f228235719Ken Sumrall } 834671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 835671cd2188e2f224aaeac4955785199f228235719Ken Sumrall if (get_fs_fixup_state(fd) == STATE_MARKING_INUMS) { 836671cd2188e2f224aaeac4955785199f228235719Ken Sumrall if (!recurse_dir(fd, &root_inode, dirbuf, dirsize, MARK_INODE_NUMS)) { 837671cd2188e2f224aaeac4955785199f228235719Ken Sumrall set_fs_fixup_state(fd, STATE_UPDATING_INUMS); 838671cd2188e2f224aaeac4955785199f228235719Ken Sumrall } 839671cd2188e2f224aaeac4955785199f228235719Ken Sumrall } 840671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 841671cd2188e2f224aaeac4955785199f228235719Ken Sumrall if (get_fs_fixup_state(fd) == STATE_UPDATING_INUMS) { 842671cd2188e2f224aaeac4955785199f228235719Ken Sumrall if (!recurse_dir(fd, &root_inode, dirbuf, dirsize, UPDATE_INODE_NUMS)) { 843671cd2188e2f224aaeac4955785199f228235719Ken Sumrall set_fs_fixup_state(fd, STATE_UPDATING_SB); 844671cd2188e2f224aaeac4955785199f228235719Ken Sumrall } 845671cd2188e2f224aaeac4955785199f228235719Ken Sumrall } 846671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 847671cd2188e2f224aaeac4955785199f228235719Ken Sumrall if (get_fs_fixup_state(fd) == STATE_UPDATING_SB) { 848671cd2188e2f224aaeac4955785199f228235719Ken Sumrall /* set the new inodes/blockgruop number, 849671cd2188e2f224aaeac4955785199f228235719Ken Sumrall * and sets the state back to 0. 850671cd2188e2f224aaeac4955785199f228235719Ken Sumrall */ 851671cd2188e2f224aaeac4955785199f228235719Ken Sumrall if (!update_superblocks_and_bg_desc(fd, STATE_UPDATING_SB)) { 852671cd2188e2f224aaeac4955785199f228235719Ken Sumrall set_fs_fixup_state(fd, STATE_UNSET); 853671cd2188e2f224aaeac4955785199f228235719Ken Sumrall } 854671cd2188e2f224aaeac4955785199f228235719Ken Sumrall } 855671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 856671cd2188e2f224aaeac4955785199f228235719Ken Sumrall close(fd); 857671cd2188e2f224aaeac4955785199f228235719Ken Sumrall 858671cd2188e2f224aaeac4955785199f228235719Ken Sumrall return 0; 859671cd2188e2f224aaeac4955785199f228235719Ken Sumrall} 860