+ * Context information that does not change across rewrite_one_inode()
+ * invocations.
+ */
+struct rewrite_context {
+ ext2_filsys fs;
+ struct ext2_inode *zero_inode;
+ char *ea_buf;
+ int inode_size;
+};
+
+#define fatal_err(code, args...) \
+ do { \
+ com_err(__func__, code, args); \
+ exit(1); \
+ } while (0);
+
+static void update_ea_inode_hash(struct rewrite_context *ctx, ext2_ino_t ino,
+ struct ext2_inode *inode)
+{
+ errcode_t retval;
+ ext2_file_t file;
+ __u32 hash;
+
+ retval = ext2fs_file_open(ctx->fs, ino, 0, &file);
+ if (retval)
+ fatal_err(retval, "open ea_inode");
+ retval = ext2fs_file_read(file, ctx->ea_buf, inode->i_size,
+ NULL);
+ if (retval)
+ fatal_err(retval, "read ea_inode");
+ retval = ext2fs_file_close(file);
+ if (retval)
+ fatal_err(retval, "close ea_inode");
+
+ hash = ext2fs_crc32c_le(ctx->fs->csum_seed,
+ (unsigned char *) ctx->ea_buf, inode->i_size);
+ ext2fs_set_ea_inode_hash(inode, hash);
+}
+
+static int update_xattr_entry_hashes(ext2_filsys fs,
+ struct ext2_ext_attr_entry *entry,
+ struct ext2_ext_attr_entry *end)
+{
+ int modified = 0;
+ errcode_t retval;
+
+ while (entry < end && !EXT2_EXT_IS_LAST_ENTRY(entry)) {
+ if (entry->e_value_inum) {
+ retval = ext2fs_ext_attr_hash_entry2(fs, entry, NULL,
+ &entry->e_hash);
+ if (retval)
+ fatal_err(retval, "hash ea_inode entry");
+ modified = 1;
+ }
+ entry = EXT2_EXT_ATTR_NEXT(entry);
+ }
+ return modified;
+}
+
+static void update_inline_xattr_hashes(struct rewrite_context *ctx,
+ struct ext2_inode_large *inode)
+{
+ struct ext2_ext_attr_entry *start, *end;
+ __u32 *ea_magic;
+
+ if (inode->i_extra_isize == 0)
+ return;
+
+ if (inode->i_extra_isize & 3 ||
+ inode->i_extra_isize > ctx->inode_size - EXT2_GOOD_OLD_INODE_SIZE)
+ fatal_err(EXT2_ET_INODE_CORRUPTED, "bad i_extra_isize")
+
+ ea_magic = (__u32 *)((char *)inode + EXT2_GOOD_OLD_INODE_SIZE +
+ inode->i_extra_isize);
+ if (*ea_magic != EXT2_EXT_ATTR_MAGIC)
+ return;
+
+ start = (struct ext2_ext_attr_entry *)(ea_magic + 1);
+ end = (struct ext2_ext_attr_entry *)((char *)inode + ctx->inode_size);
+
+ update_xattr_entry_hashes(ctx->fs, start, end);
+}
+
+static void update_block_xattr_hashes(struct rewrite_context *ctx,
+ char *block_buf)
+{
+ struct ext2_ext_attr_header *header;
+ struct ext2_ext_attr_entry *start, *end;
+
+ header = (struct ext2_ext_attr_header *)block_buf;
+ if (header->h_magic != EXT2_EXT_ATTR_MAGIC)
+ return;
+
+ start = (struct ext2_ext_attr_entry *)(header+1);
+ end = (struct ext2_ext_attr_entry *)(block_buf + ctx->fs->blocksize);
+
+ if (update_xattr_entry_hashes(ctx->fs, start, end))
+ ext2fs_ext_attr_block_rehash(header, end);
+}
+
+static void rewrite_one_inode(struct rewrite_context *ctx, ext2_ino_t ino,
+ struct ext2_inode *inode)
+{
+ blk64_t file_acl_block;
+ errcode_t retval;
+
+ if (!ext2fs_test_inode_bitmap2(ctx->fs->inode_map, ino)) {
+ if (!memcmp(inode, ctx->zero_inode, ctx->inode_size))
+ return;
+ memset(inode, 0, ctx->inode_size);
+ }
+
+ if (inode->i_flags & EXT4_EA_INODE_FL)
+ update_ea_inode_hash(ctx, ino, inode);
+
+ if (ctx->inode_size != EXT2_GOOD_OLD_INODE_SIZE)
+ update_inline_xattr_hashes(ctx,
+ (struct ext2_inode_large *)inode);
+
+ retval = ext2fs_write_inode_full(ctx->fs, ino, inode, ctx->inode_size);
+ if (retval)
+ fatal_err(retval, "while writing inode");
+
+ retval = ext2fs_fix_extents_checksums(ctx->fs, ino, inode);
+ if (retval)
+ fatal_err(retval, "while rewriting extents");
+
+ if (LINUX_S_ISDIR(inode->i_mode) &&
+ ext2fs_inode_has_valid_blocks2(ctx->fs, inode)) {
+ retval = rewrite_directory(ctx->fs, ino, inode);
+ if (retval)
+ fatal_err(retval, "while rewriting directories");
+ }
+
+ file_acl_block = ext2fs_file_acl_block(ctx->fs, inode);
+ if (!file_acl_block)
+ return;
+
+ retval = ext2fs_read_ext_attr3(ctx->fs, file_acl_block, ctx->ea_buf,
+ ino);
+ if (retval)
+ fatal_err(retval, "while rewriting extended attribute");
+
+ update_block_xattr_hashes(ctx, ctx->ea_buf);
+ retval = ext2fs_write_ext_attr3(ctx->fs, file_acl_block, ctx->ea_buf,
+ ino);
+ if (retval)
+ fatal_err(retval, "while rewriting extended attribute");
+}
+
+/*