| /* |
| * Copyright (C) 2010 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| #include "ext4_utils.h" |
| #include "make_ext4fs.h" |
| #include "ext4_extents.h" |
| #include "allocate.h" |
| #include "ext4fixup.h" |
| |
| #include <sparse/sparse.h> |
| |
| #include <sys/types.h> |
| #include <sys/stat.h> |
| #include <sys/types.h> |
| #include <fcntl.h> |
| #include <unistd.h> |
| |
| #ifndef USE_MINGW |
| #include <sys/mman.h> |
| #endif |
| |
| #if defined(__APPLE__) && defined(__MACH__) |
| #define lseek64 lseek |
| #define off64_t off_t |
| #endif |
| |
| /* The inode block count for a file/directory is in units of 512 byte blocks, |
| * _NOT_ the filesystem block size! |
| */ |
| #define INODE_BLOCK_SIZE 512 |
| |
| #define MAX_EXT4_BLOCK_SIZE 4096 |
| |
| /* The two modes the recurse_dir() can be in */ |
| #define SANITY_CHECK_PASS 1 |
| #define MARK_INODE_NUMS 2 |
| #define UPDATE_INODE_NUMS 3 |
| |
| /* Magic numbers to indicate what state the update process is in */ |
| #define MAGIC_STATE_MARKING_INUMS 0x7000151515565512ll |
| #define MAGIC_STATE_UPDATING_INUMS 0x6121131211735123ll |
| #define MAGIC_STATE_UPDATING_SB 0x15e1715151558477ll |
| |
| /* Internal state variables corresponding to the magic numbers */ |
| #define STATE_UNSET 0 |
| #define STATE_MARKING_INUMS 1 |
| #define STATE_UPDATING_INUMS 2 |
| #define STATE_UPDATING_SB 3 |
| |
| /* Used for automated testing of this programs ability to stop and be restarted wthout error */ |
| static int bail_phase = 0; |
| static int bail_loc = 0; |
| static int bail_count = 0; |
| static int count = 0; |
| |
| /* global flags */ |
| static int verbose = 0; |
| static int no_write = 0; |
| |
| static int new_inodes_per_group = 0; |
| |
| static int no_write_fixup_state = 0; |
| |
| static int compute_new_inum(unsigned int old_inum) |
| { |
| unsigned int group, offset; |
| |
| group = (old_inum - 1) / info.inodes_per_group; |
| offset = (old_inum -1) % info.inodes_per_group; |
| |
| return (group * new_inodes_per_group) + offset + 1; |
| } |
| |
| /* Function to read the primary superblock */ |
| static void read_sb(int fd, struct ext4_super_block *sb) |
| { |
| off64_t ret; |
| |
| ret = lseek64(fd, 1024, SEEK_SET); |
| if (ret < 0) |
| critical_error_errno("failed to seek to superblock"); |
| |
| ret = read(fd, sb, sizeof(*sb)); |
| if (ret < 0) |
| critical_error_errno("failed to read superblock"); |
| if (ret != sizeof(*sb)) |
| critical_error("failed to read all of superblock"); |
| } |
| |
| /* Function to write a primary or backup superblock at a given offset */ |
| static void write_sb(int fd, unsigned long long offset, struct ext4_super_block *sb) |
| { |
| off64_t ret; |
| |
| if (no_write) { |
| return; |
| } |
| |
| ret = lseek64(fd, offset, SEEK_SET); |
| if (ret < 0) |
| critical_error_errno("failed to seek to superblock"); |
| |
| ret = write(fd, sb, sizeof(*sb)); |
| if (ret < 0) |
| critical_error_errno("failed to write superblock"); |
| if (ret != sizeof(*sb)) |
| critical_error("failed to write all of superblock"); |
| } |
| |
| static int get_fs_fixup_state(int fd) |
| { |
| unsigned long long magic; |
| int ret, len; |
| |
| if (no_write) { |
| return no_write_fixup_state; |
| } |
| |
| lseek64(fd, 0, SEEK_SET); |
| len = read(fd, &magic, sizeof(magic)); |
| if (len != sizeof(magic)) { |
| critical_error("cannot read fixup_state\n"); |
| } |
| |
| switch (magic) { |
| case MAGIC_STATE_MARKING_INUMS: |
| ret = STATE_MARKING_INUMS; |
| break; |
| case MAGIC_STATE_UPDATING_INUMS: |
| ret = STATE_UPDATING_INUMS; |
| break; |
| case MAGIC_STATE_UPDATING_SB: |
| ret = STATE_UPDATING_SB; |
| break; |
| default: |
| ret = STATE_UNSET; |
| } |
| return ret; |
| } |
| |
| static int set_fs_fixup_state(int fd, int state) |
| { |
| unsigned long long magic; |
| struct ext4_super_block sb; |
| int len; |
| |
| if (no_write) { |
| no_write_fixup_state = state; |
| return 0; |
| } |
| |
| switch (state) { |
| case STATE_MARKING_INUMS: |
| magic = MAGIC_STATE_MARKING_INUMS; |
| break; |
| case STATE_UPDATING_INUMS: |
| magic = MAGIC_STATE_UPDATING_INUMS; |
| break; |
| case STATE_UPDATING_SB: |
| magic = MAGIC_STATE_UPDATING_SB; |
| break; |
| case STATE_UNSET: |
| default: |
| magic = 0ll; |
| break; |
| } |
| |
| lseek64(fd, 0, SEEK_SET); |
| len = write(fd, &magic, sizeof(magic)); |
| if (len != sizeof(magic)) { |
| critical_error("cannot write fixup_state\n"); |
| } |
| |
| read_sb(fd, &sb); |
| if (magic) { |
| /* If we are in the process of updating the filesystem, make it unmountable */ |
| sb.s_desc_size |= 1; |
| } else { |
| /* we are done, so make the filesystem mountable again */ |
| sb.s_desc_size &= ~1; |
| } |
| write_sb(fd, 1024, &sb); |
| |
| return 0; |
| } |
| |
| static int read_ext(int fd) |
| { |
| off64_t ret; |
| struct ext4_super_block sb; |
| unsigned int i; |
| |
| read_sb(fd, &sb); |
| |
| ext4_parse_sb(&sb); |
| |
| if (info.feat_incompat & EXT4_FEATURE_INCOMPAT_RECOVER) { |
| critical_error("Filesystem needs recovery first, mount and unmount to do that\n"); |
| } |
| |
| /* Clear the low bit which is set while this tool is in progress. |
| * If the tool crashes, it will still be set when we restart. |
| * The low bit is set to make the filesystem unmountable while |
| * it is being fixed up. Also allow 0, which means the old ext2 |
| * size is in use. |
| */ |
| if (((sb.s_desc_size & ~1) != sizeof(struct ext2_group_desc)) && |
| ((sb.s_desc_size & ~1) != 0)) |
| critical_error("error: bg_desc_size != sizeof(struct ext2_group_desc)\n"); |
| |
| ret = lseek64(fd, info.len, SEEK_SET); |
| if (ret < 0) |
| critical_error_errno("failed to seek to end of input image"); |
| |
| ret = lseek64(fd, info.block_size * (aux_info.first_data_block + 1), SEEK_SET); |
| if (ret < 0) |
| critical_error_errno("failed to seek to block group descriptors"); |
| |
| ret = read(fd, aux_info.bg_desc, info.block_size * aux_info.bg_desc_blocks); |
| if (ret < 0) |
| critical_error_errno("failed to read block group descriptors"); |
| if (ret != (int)info.block_size * (int)aux_info.bg_desc_blocks) |
| critical_error("failed to read all of block group descriptors"); |
| |
| if (verbose) { |
| printf("Found filesystem with parameters:\n"); |
| printf(" Size: %llu\n", info.len); |
| printf(" Block size: %d\n", info.block_size); |
| printf(" Blocks per group: %d\n", info.blocks_per_group); |
| printf(" Inodes per group: %d\n", info.inodes_per_group); |
| printf(" Inode size: %d\n", info.inode_size); |
| printf(" Label: %s\n", info.label); |
| printf(" Blocks: %llu\n", aux_info.len_blocks); |
| printf(" Block groups: %d\n", aux_info.groups); |
| printf(" Reserved block group size: %d\n", info.bg_desc_reserve_blocks); |
| printf(" Used %d/%d inodes and %d/%d blocks\n", |
| aux_info.sb->s_inodes_count - aux_info.sb->s_free_inodes_count, |
| aux_info.sb->s_inodes_count, |
| aux_info.sb->s_blocks_count_lo - aux_info.sb->s_free_blocks_count_lo, |
| aux_info.sb->s_blocks_count_lo); |
| } |
| |
| return 0; |
| } |
| |
| static int read_inode(int fd, unsigned int inum, struct ext4_inode *inode) |
| { |
| unsigned int bg_num, bg_offset; |
| off64_t inode_offset; |
| int len; |
| |
| bg_num = (inum-1) / info.inodes_per_group; |
| bg_offset = (inum-1) % info.inodes_per_group; |
| |
| inode_offset = ((unsigned long long)aux_info.bg_desc[bg_num].bg_inode_table * info.block_size) + |
| (bg_offset * info.inode_size); |
| |
| if (lseek64(fd, inode_offset, SEEK_SET) < 0) { |
| critical_error_errno("failed to seek to inode %d\n", inum); |
| } |
| |
| len=read(fd, inode, sizeof(*inode)); |
| if (len != sizeof(*inode)) { |
| critical_error_errno("failed to read inode %d\n", inum); |
| } |
| |
| return 0; |
| } |
| |
| static int read_block(int fd, unsigned long long block_num, void *block) |
| { |
| off64_t off; |
| unsigned int len; |
| |
| off = block_num * info.block_size; |
| |
| if (lseek64(fd, off, SEEK_SET) , 0) { |
| critical_error_errno("failed to seek to block %lld\n", block_num); |
| } |
| |
| len=read(fd, block, info.block_size); |
| if (len != info.block_size) { |
| critical_error_errno("failed to read block %lld\n", block_num); |
| } |
| |
| return 0; |
| } |
| |
| static int write_block(int fd, unsigned long long block_num, void *block) |
| { |
| off64_t off; |
| unsigned int len; |
| |
| if (no_write) { |
| return 0; |
| } |
| |
| off = block_num * info.block_size; |
| |
| if (lseek64(fd, off, SEEK_SET) < 0) { |
| critical_error_errno("failed to seek to block %lld\n", block_num); |
| } |
| |
| len=write(fd, block, info.block_size); |
| if (len != info.block_size) { |
| critical_error_errno("failed to write block %lld\n", block_num); |
| } |
| |
| return 0; |
| } |
| |
| static int bitmap_get_bit(u8 *bitmap, u32 bit) |
| { |
| if (bitmap[bit / 8] & (1 << (bit % 8))) |
| return 1; |
| |
| return 0; |
| } |
| |
| static void bitmap_clear_bit(u8 *bitmap, u32 bit) |
| { |
| bitmap[bit / 8] &= ~(1 << (bit % 8)); |
| |
| return; |
| } |
| |
| static void check_inode_bitmap(int fd, unsigned int bg_num) |
| { |
| unsigned int inode_bitmap_block_num; |
| unsigned char block[MAX_EXT4_BLOCK_SIZE]; |
| int i, bitmap_updated = 0; |
| |
| /* Using the bg_num, aux_info.bg_desc[], info.inodes_per_group and |
| * new_inodes_per_group, retrieve the inode bitmap, and make sure |
| * the bits between the old and new size are clear |
| */ |
| inode_bitmap_block_num = aux_info.bg_desc[bg_num].bg_inode_bitmap; |
| |
| read_block(fd, inode_bitmap_block_num, block); |
| |
| for (i = info.inodes_per_group; i < new_inodes_per_group; i++) { |
| if (bitmap_get_bit(block, i)) { |
| bitmap_clear_bit(block, i); |
| bitmap_updated = 1; |
| } |
| } |
| |
| if (bitmap_updated) { |
| if (verbose) { |
| printf("Warning: updated inode bitmap for block group %d\n", bg_num); |
| } |
| write_block(fd, inode_bitmap_block_num, block); |
| } |
| |
| return; |
| } |
| |
| /* Update the superblock and bgdesc of the specified block group */ |
| static int update_superblocks_and_bg_desc(int fd, int state) |
| { |
| off64_t ret; |
| struct ext4_super_block sb; |
| unsigned int num_block_groups, total_new_inodes; |
| unsigned int i; |
| |
| |
| read_sb(fd, &sb); |
| |
| /* Compute how many more inodes are now available */ |
| num_block_groups = DIV_ROUND_UP(aux_info.len_blocks, info.blocks_per_group); |
| total_new_inodes = num_block_groups * (new_inodes_per_group - sb.s_inodes_per_group); |
| |
| if (verbose) { |
| printf("created %d additional inodes\n", total_new_inodes); |
| } |
| |
| /* Update the free inodes count in each block group descriptor */ |
| for (i = 0; i < num_block_groups; i++) { |
| if (state == STATE_UPDATING_SB) { |
| aux_info.bg_desc[i].bg_free_inodes_count += (new_inodes_per_group - sb.s_inodes_per_group); |
| } |
| check_inode_bitmap(fd, i); |
| } |
| |
| /* First some sanity checks */ |
| if ((sb.s_inodes_count + total_new_inodes) != (new_inodes_per_group * num_block_groups)) { |
| critical_error("Failed sanity check on new inode count\n"); |
| } |
| if (new_inodes_per_group % (info.block_size/info.inode_size)) { |
| critical_error("Failed sanity check on new inode per group alignment\n"); |
| } |
| |
| /* Update the free inodes count in the superblock */ |
| sb.s_inodes_count += total_new_inodes; |
| sb.s_free_inodes_count += total_new_inodes; |
| sb.s_inodes_per_group = new_inodes_per_group; |
| |
| for (i = 0; i < aux_info.groups; i++) { |
| if (ext4_bg_has_super_block(i)) { |
| unsigned int sb_offset; |
| |
| if (i == 0) { |
| /* The first superblock is offset by 1K to leave room for boot sectors */ |
| sb_offset = 1024; |
| } else { |
| sb_offset = 0; |
| } |
| |
| sb.s_block_group_nr = i; |
| /* Don't write out the backup superblocks with the bit set in the s_desc_size |
| * which prevents the filesystem from mounting. The bit for the primary |
| * superblock will be cleared on the final call to set_fs_fixup_state() */ |
| if (i != 0) { |
| sb.s_desc_size &= ~1; |
| } |
| |
| write_sb(fd, (unsigned long long)i * info.blocks_per_group * info.block_size + sb_offset, &sb); |
| |
| ret = lseek64(fd, ((unsigned long long)i * info.blocks_per_group * info.block_size) + |
| (info.block_size * (aux_info.first_data_block + 1)), SEEK_SET); |
| if (ret < 0) |
| critical_error_errno("failed to seek to block group descriptors"); |
| |
| if (!no_write) { |
| ret = write(fd, aux_info.bg_desc, info.block_size * aux_info.bg_desc_blocks); |
| if (ret < 0) |
| critical_error_errno("failed to write block group descriptors"); |
| if (ret != (int)info.block_size * (int)aux_info.bg_desc_blocks) |
| critical_error("failed to write all of block group descriptors"); |
| } |
| } |
| if ((bail_phase == 4) && ((unsigned int)bail_count == i)) { |
| critical_error("bailing at phase 4\n"); |
| } |
| } |
| |
| return 0; |
| } |
| |
| |
| static int get_direct_blocks(struct ext4_inode *inode, unsigned long long *block_list, |
| unsigned int *count) |
| { |
| unsigned int i = 0; |
| unsigned int ret = 0; |
| unsigned int sectors_per_block; |
| |
| sectors_per_block = info.block_size / INODE_BLOCK_SIZE; |
| while ((i < (inode->i_blocks_lo / sectors_per_block)) && (i < EXT4_NDIR_BLOCKS)) { |
| block_list[i] = inode->i_block[i]; |
| i++; |
| } |
| |
| *count += i; |
| |
| if ((inode->i_blocks_lo / sectors_per_block) > EXT4_NDIR_BLOCKS) { |
| ret = 1; |
| } |
| |
| return ret; |
| } |
| |
| static int get_indirect_blocks(int fd, struct ext4_inode *inode, |
| unsigned long long *block_list, unsigned int *count) |
| { |
| unsigned int i; |
| unsigned int *indirect_block; |
| unsigned int sectors_per_block; |
| |
| sectors_per_block = info.block_size / INODE_BLOCK_SIZE; |
| |
| indirect_block = (unsigned int *)malloc(info.block_size); |
| if (indirect_block == 0) { |
| critical_error("failed to allocate memory for indirect_block\n"); |
| } |
| |
| read_block(fd, inode->i_block[EXT4_NDIR_BLOCKS], indirect_block); |
| |
| for(i = 0; i < (inode->i_blocks_lo / sectors_per_block - EXT4_NDIR_BLOCKS); i++) { |
| block_list[EXT4_NDIR_BLOCKS+i] = indirect_block[i]; |
| } |
| |
| *count += i; |
| |
| free(indirect_block); |
| |
| return 0; |
| } |
| |
| static int get_block_list_indirect(int fd, struct ext4_inode *inode, unsigned long long *block_list) |
| { |
| unsigned int count=0; |
| |
| if (get_direct_blocks(inode, block_list, &count)) { |
| get_indirect_blocks(fd, inode, block_list, &count); |
| } |
| |
| return count; |
| } |
| |
| static int get_extent_ents(int fd, struct ext4_extent_header *ext_hdr, unsigned long long *block_list) |
| { |
| int i, j; |
| struct ext4_extent *extent; |
| off64_t fs_block_num; |
| |
| if (ext_hdr->eh_depth != 0) { |
| critical_error("get_extent_ents called with eh_depth != 0\n"); |
| } |
| |
| /* The extent entries immediately follow the header, so add 1 to the pointer |
| * and cast it to an extent pointer. |
| */ |
| extent = (struct ext4_extent *)(ext_hdr + 1); |
| |
| for (i = 0; i < ext_hdr->eh_entries; i++) { |
| fs_block_num = ((off64_t)extent->ee_start_hi << 32) | extent->ee_start_lo; |
| for (j = 0; j < extent->ee_len; j++) { |
| block_list[extent->ee_block+j] = fs_block_num+j; |
| } |
| extent++; |
| } |
| |
| return 0; |
| } |
| |
| static int get_extent_idx(int fd, struct ext4_extent_header *ext_hdr, unsigned long long *block_list) |
| { |
| int i; |
| struct ext4_extent_idx *extent_idx; |
| struct ext4_extent_header *tmp_ext_hdr; |
| off64_t fs_block_num; |
| unsigned char block[MAX_EXT4_BLOCK_SIZE]; |
| |
| /* Sanity check */ |
| if (ext_hdr->eh_depth == 0) { |
| critical_error("get_extent_idx called with eh_depth == 0\n"); |
| } |
| |
| /* The extent entries immediately follow the header, so add 1 to the pointer |
| * and cast it to an extent pointer. |
| */ |
| extent_idx = (struct ext4_extent_idx *)(ext_hdr + 1); |
| |
| for (i = 0; i < ext_hdr->eh_entries; i++) { |
| fs_block_num = ((off64_t)extent_idx->ei_leaf_hi << 32) | extent_idx->ei_leaf_lo; |
| read_block(fd, fs_block_num, block); |
| tmp_ext_hdr = (struct ext4_extent_header *)block; |
| |
| if (tmp_ext_hdr->eh_depth == 0) { |
| get_extent_ents(fd, tmp_ext_hdr, block_list); /* leaf node, fill in block_list */ |
| } else { |
| get_extent_idx(fd, tmp_ext_hdr, block_list); /* recurse down the tree */ |
| } |
| } |
| |
| return 0; |
| } |
| |
| static int get_block_list_extents(int fd, struct ext4_inode *inode, unsigned long long *block_list) |
| { |
| struct ext4_extent_header *extent_hdr; |
| |
| extent_hdr = (struct ext4_extent_header *)inode->i_block; |
| |
| if (extent_hdr->eh_magic != EXT4_EXT_MAGIC) { |
| critical_error("extent header has unexpected magic value 0x%4.4x\n", |
| extent_hdr->eh_magic); |
| } |
| |
| if (extent_hdr->eh_depth == 0) { |
| get_extent_ents(fd, (struct ext4_extent_header *)inode->i_block, block_list); |
| return 0; |
| } |
| |
| get_extent_idx(fd, (struct ext4_extent_header *)inode->i_block, block_list); |
| |
| return 0; |
| } |
| |
| static int is_entry_dir(int fd, struct ext4_dir_entry_2 *dirp, int pass) |
| { |
| struct ext4_inode inode; |
| int ret = 0; |
| |
| if (dirp->file_type == EXT4_FT_DIR) { |
| ret = 1; |
| } else if (dirp->file_type == EXT4_FT_UNKNOWN) { |
| /* Somebody was too lazy to fill in the dir entry, |
| * so we have to go fetch it from the inode. Grrr. |
| */ |
| /* if UPDATE_INODE_NUMS pass and the inode high bit is not |
| * set return false so we don't recurse down the tree that is |
| * already updated. Otherwise, fetch inode, and return answer. |
| */ |
| if ((pass == UPDATE_INODE_NUMS) && !(dirp->inode & 0x80000000)) { |
| ret = 0; |
| } else { |
| read_inode(fd, (dirp->inode & 0x7fffffff), &inode); |
| if (S_ISDIR(inode.i_mode)) { |
| ret = 1; |
| } |
| } |
| } |
| |
| return ret; |
| } |
| |
| static int recurse_dir(int fd, struct ext4_inode *inode, char *dirbuf, int dirsize, int mode) |
| { |
| unsigned long long *block_list; |
| unsigned int num_blocks; |
| struct ext4_dir_entry_2 *dirp, *prev_dirp = 0; |
| char name[256]; |
| unsigned int i, leftover_space, is_dir; |
| struct ext4_inode tmp_inode; |
| int tmp_dirsize; |
| char *tmp_dirbuf; |
| |
| switch (mode) { |
| case SANITY_CHECK_PASS: |
| case MARK_INODE_NUMS: |
| case UPDATE_INODE_NUMS: |
| break; |
| default: |
| critical_error("recurse_dir() called witn unknown mode!\n"); |
| } |
| |
| if (dirsize % info.block_size) { |
| critical_error("dirsize %d not a multiple of block_size %d. This is unexpected!\n", |
| dirsize, info.block_size); |
| } |
| |
| num_blocks = dirsize / info.block_size; |
| |
| block_list = malloc((num_blocks + 1) * sizeof(*block_list)); |
| if (block_list == 0) { |
| critical_error("failed to allocate memory for block_list\n"); |
| } |
| |
| if (inode->i_flags & EXT4_EXTENTS_FL) { |
| get_block_list_extents(fd, inode, block_list); |
| } else { |
| /* A directory that requires doubly or triply indirect blocks in huge indeed, |
| * and will almost certainly not exist, especially since make_ext4fs only creates |
| * directories with extents, and the kernel will too, but check to make sure the |
| * directory is not that big and give an error if so. Our limit is 12 direct blocks, |
| * plus block_size/4 singly indirect blocks, which for a filesystem with 4K blocks |
| * is a directory 1036 blocks long, or 4,243,456 bytes long! Assuming an average |
| * filename length of 20 (which I think is generous) thats 20 + 8 bytes overhead |
| * per entry, or 151,552 entries in the directory! |
| */ |
| if (num_blocks > (info.block_size / 4 + EXT4_NDIR_BLOCKS)) { |
| critical_error("Non-extent based directory is too big!\n"); |
| } |
| get_block_list_indirect(fd, inode, block_list); |
| } |
| |
| /* Read in all the blocks for this directory */ |
| for (i = 0; i < num_blocks; i++) { |
| read_block(fd, block_list[i], dirbuf + (i * info.block_size)); |
| } |
| |
| dirp = (struct ext4_dir_entry_2 *)dirbuf; |
| while (dirp < (struct ext4_dir_entry_2 *)(dirbuf + dirsize)) { |
| count++; |
| leftover_space = (char *)(dirbuf + dirsize) - (char *)dirp; |
| if (((mode == SANITY_CHECK_PASS) || (mode == UPDATE_INODE_NUMS)) && |
| (leftover_space <= 8) && prev_dirp) { |
| /* This is a bug in an older version of make_ext4fs, where it |
| * didn't properly include the rest of the block in rec_len. |
| * Update rec_len on the previous entry to include the rest of |
| * the block and exit the loop. |
| */ |
| if (verbose) { |
| printf("fixing up short rec_len for diretory entry for %s\n", name); |
| } |
| prev_dirp->rec_len += leftover_space; |
| break; |
| } |
| |
| if (dirp->inode == 0) { |
| /* This is the last entry in the directory */ |
| break; |
| } |
| |
| strncpy(name, dirp->name, dirp->name_len); |
| name[dirp->name_len]='\0'; |
| |
| /* Only recurse on pass UPDATE_INODE_NUMS if the high bit is set. |
| * Otherwise, this inode entry has already been updated |
| * and we'll do the wrong thing. Also don't recurse on . or .., |
| * and certainly not on non-directories! |
| */ |
| /* Hrm, looks like filesystems made by fastboot on stingray set the file_type |
| * flag, but the lost+found directory has the type set to Unknown, which |
| * seems to imply I need to read the inode and get it. |
| */ |
| is_dir = is_entry_dir(fd, dirp, mode); |
| if ( is_dir && (strcmp(name, ".") && strcmp(name, "..")) && |
| ((mode == SANITY_CHECK_PASS) || (mode == MARK_INODE_NUMS) || |
| ((mode == UPDATE_INODE_NUMS) && (dirp->inode & 0x80000000))) ) { |
| /* A directory! Recurse! */ |
| read_inode(fd, dirp->inode & 0x7fffffff, &tmp_inode); |
| |
| if (!S_ISDIR(tmp_inode.i_mode)) { |
| critical_error("inode %d for name %s does not point to a directory\n", |
| dirp->inode & 0x7fffffff, name); |
| } |
| if (verbose) { |
| printf("inode %d %s use extents\n", dirp->inode & 0x7fffffff, |
| (tmp_inode.i_flags & EXT4_EXTENTS_FL) ? "does" : "does not"); |
| } |
| |
| tmp_dirsize = tmp_inode.i_blocks_lo * INODE_BLOCK_SIZE; |
| if (verbose) { |
| printf("dir size = %d bytes\n", tmp_dirsize); |
| } |
| |
| tmp_dirbuf = malloc(tmp_dirsize); |
| if (tmp_dirbuf == 0) { |
| critical_error("failed to allocate memory for tmp_dirbuf\n"); |
| } |
| |
| recurse_dir(fd, &tmp_inode, tmp_dirbuf, tmp_dirsize, mode); |
| |
| free(tmp_dirbuf); |
| } |
| |
| if (verbose) { |
| if (is_dir) { |
| printf("Directory %s\n", name); |
| } else { |
| printf("Non-directory %s\n", name); |
| } |
| } |
| |
| /* Process entry based on current mode. Either set high bit or change inode number */ |
| if (mode == MARK_INODE_NUMS) { |
| dirp->inode |= 0x80000000; |
| } else if (mode == UPDATE_INODE_NUMS) { |
| if (dirp->inode & 0x80000000) { |
| dirp->inode = compute_new_inum(dirp->inode & 0x7fffffff); |
| } |
| } |
| |
| if ((bail_phase == mode) && (bail_loc == 1) && (bail_count == count)) { |
| critical_error("Bailing at phase %d, loc 1 and count %d\n", mode, count); |
| } |
| |
| /* Point dirp at the next entry */ |
| prev_dirp = dirp; |
| dirp = (struct ext4_dir_entry_2*)((char *)dirp + dirp->rec_len); |
| } |
| |
| /* Write out all the blocks for this directory */ |
| for (i = 0; i < num_blocks; i++) { |
| write_block(fd, block_list[i], dirbuf + (i * info.block_size)); |
| if ((bail_phase == mode) && (bail_loc == 2) && (bail_count <= count)) { |
| critical_error("Bailing at phase %d, loc 2 and count %d\n", mode, count); |
| } |
| } |
| |
| free(block_list); |
| |
| return 0; |
| } |
| |
| int ext4fixup(char *fsdev) |
| { |
| return ext4fixup_internal(fsdev, 0, 0, 0, 0, 0); |
| } |
| |
| int ext4fixup_internal(char *fsdev, int v_flag, int n_flag, |
| int stop_phase, int stop_loc, int stop_count) |
| { |
| int fd; |
| struct ext4_inode root_inode; |
| unsigned int dirsize; |
| char *dirbuf; |
| |
| if (setjmp(setjmp_env)) |
| return EXIT_FAILURE; /* Handle a call to longjmp() */ |
| |
| verbose = v_flag; |
| no_write = n_flag; |
| |
| bail_phase = stop_phase; |
| bail_loc = stop_loc; |
| bail_count = stop_count; |
| |
| fd = open(fsdev, O_RDWR); |
| |
| if (fd < 0) |
| critical_error_errno("failed to open filesystem image"); |
| |
| read_ext(fd); |
| |
| if ((info.feat_incompat & EXT4_FEATURE_INCOMPAT_FILETYPE) == 0) { |
| critical_error("Expected filesystem to have filetype flag set\n"); |
| } |
| |
| #if 0 // If we have to fix the directory rec_len issue, we can't use this check |
| /* Check to see if the inodes/group is copacetic */ |
| if (info.inodes_per_blockgroup % (info.block_size/info.inode_size) == 0) { |
| /* This filesystem has either already been updated, or was |
| * made correctly. |
| */ |
| if (verbose) { |
| printf("%s: filesystem correct, no work to do\n", me); |
| } |
| exit(0); |
| } |
| #endif |
| |
| /* Compute what the new value of inodes_per_blockgroup will be when we're done */ |
| new_inodes_per_group=ALIGN(info.inodes_per_group,(info.block_size/info.inode_size)); |
| |
| read_inode(fd, EXT4_ROOT_INO, &root_inode); |
| |
| if (!S_ISDIR(root_inode.i_mode)) { |
| critical_error("root inode %d does not point to a directory\n", EXT4_ROOT_INO); |
| } |
| if (verbose) { |
| printf("inode %d %s use extents\n", EXT4_ROOT_INO, |
| (root_inode.i_flags & EXT4_EXTENTS_FL) ? "does" : "does not"); |
| } |
| |
| dirsize = root_inode.i_blocks_lo * INODE_BLOCK_SIZE; |
| if (verbose) { |
| printf("root dir size = %d bytes\n", dirsize); |
| } |
| |
| dirbuf = malloc(dirsize); |
| if (dirbuf == 0) { |
| critical_error("failed to allocate memory for dirbuf\n"); |
| } |
| |
| /* Perform a sanity check pass first, try to catch any errors that will occur |
| * before we actually change anything, so we don't leave a filesystem in a |
| * corrupted, unrecoverable state. Set no_write, make it quiet, and do a recurse |
| * pass and a update_superblock pass. Set flags back to requested state when done. |
| * Only perform sanity check if the state is unset. If the state is _NOT_ unset, |
| * then the tool has already been run and interrupted, and it presumably ran and |
| * passed sanity checked before it got interrupted. It is _NOT_ safe to run sanity |
| * check if state is unset because it assumes inodes are to be computed using the |
| * old inodes/group, but some inode numbers may be updated to the new number. |
| */ |
| if (get_fs_fixup_state(fd) == STATE_UNSET) { |
| verbose = 0; |
| no_write = 1; |
| recurse_dir(fd, &root_inode, dirbuf, dirsize, SANITY_CHECK_PASS); |
| update_superblocks_and_bg_desc(fd, STATE_UNSET); |
| verbose = v_flag; |
| no_write = n_flag; |
| |
| set_fs_fixup_state(fd, STATE_MARKING_INUMS); |
| } |
| |
| if (get_fs_fixup_state(fd) == STATE_MARKING_INUMS) { |
| count = 0; /* Reset debugging counter */ |
| if (!recurse_dir(fd, &root_inode, dirbuf, dirsize, MARK_INODE_NUMS)) { |
| set_fs_fixup_state(fd, STATE_UPDATING_INUMS); |
| } |
| } |
| |
| if (get_fs_fixup_state(fd) == STATE_UPDATING_INUMS) { |
| count = 0; /* Reset debugging counter */ |
| if (!recurse_dir(fd, &root_inode, dirbuf, dirsize, UPDATE_INODE_NUMS)) { |
| set_fs_fixup_state(fd, STATE_UPDATING_SB); |
| } |
| } |
| |
| if (get_fs_fixup_state(fd) == STATE_UPDATING_SB) { |
| /* set the new inodes/blockgroup number, |
| * and sets the state back to 0. |
| */ |
| if (!update_superblocks_and_bg_desc(fd, STATE_UPDATING_SB)) { |
| set_fs_fixup_state(fd, STATE_UNSET); |
| } |
| } |
| |
| close(fd); |
| |
| return 0; |
| } |
