--- /dev/null
+/*
+ * 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 "output_file.h"
+#include "backed_block.h"
+#include "allocate.h"
+#include "ext4fixup.h"
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <sys/mman.h>
+#include <fcntl.h>
+#include <unistd.h>
+
+#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
+
+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 / info.inodes_per_group;
+ offset = old_inum % info.inodes_per_group;
+
+ return (group * new_inodes_per_group) + offset;
+}
+
+/* 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);
+
+ /* 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");
+ }
+ }
+ }
+
+ 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)) {
+ 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 2 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);
+ }
+ }
+
+ /* 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));
+ }
+
+ free(block_list);
+
+ return 0;
+}
+
+int ext4fixup(char *fsdev)
+{
+ return ext4fixup_internal(fsdev, 0, 0);
+}
+
+int ext4fixup_internal(char *fsdev, int v_flag, int n_flag)
+{
+ 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;
+
+ 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.
+ */
+ 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;
+
+ if (get_fs_fixup_state(fd) == STATE_UNSET) {
+ set_fs_fixup_state(fd, STATE_MARKING_INUMS);
+ }
+
+ if (get_fs_fixup_state(fd) == STATE_MARKING_INUMS) {
+ 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) {
+ 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/blockgruop 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;
+}
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