Exemplo n.º 1
0
static errcode_t copy_dir_entries(e2fsck_t ctx,
				  struct fill_dir_struct *fd,
				  struct out_dir *outdir)
{
	ext2_filsys 		fs = ctx->fs;
	errcode_t		retval;
	char			*block_start;
	struct hash_entry 	*ent;
	struct ext2_dir_entry	*dirent;
	unsigned int		rec_len, prev_rec_len, left, slack, offset;
	int			i;
	ext2_dirhash_t		prev_hash;
	int			csum_size = 0;
	struct			ext2_dir_entry_tail *t;

	if (ctx->htree_slack_percentage == 255) {
		profile_get_uint(ctx->profile, "options",
				 "indexed_dir_slack_percentage",
				 0, 20,
				 &ctx->htree_slack_percentage);
		if (ctx->htree_slack_percentage > 100)
			ctx->htree_slack_percentage = 20;
	}

	if (EXT2_HAS_RO_COMPAT_FEATURE(fs->super,
				       EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
		csum_size = sizeof(struct ext2_dir_entry_tail);

	outdir->max = 0;
	retval = alloc_size_dir(fs, outdir,
				(fd->dir_size / fs->blocksize) + 2);
	if (retval)
		return retval;
	outdir->num = fd->compress ? 0 : 1;
	offset = 0;
	outdir->hashes[0] = 0;
	prev_hash = 1;
	if ((retval = get_next_block(fs, outdir, &block_start)))
		return retval;
	dirent = (struct ext2_dir_entry *) block_start;
	prev_rec_len = 0;
	rec_len = 0;
	left = fs->blocksize - csum_size;
	slack = fd->compress ? 12 :
		((fs->blocksize - csum_size) * ctx->htree_slack_percentage)/100;
	if (slack < 12)
		slack = 12;
	for (i = 0; i < fd->num_array; i++) {
		ent = fd->harray + i;
		if (ent->dir->inode == 0)
			continue;
		rec_len = EXT2_DIR_REC_LEN(ext2fs_dirent_name_len(ent->dir));
		if (rec_len > left) {
			if (left) {
				left += prev_rec_len;
				retval = ext2fs_set_rec_len(fs, left, dirent);
				if (retval)
					return retval;
			}
			if (csum_size) {
				t = EXT2_DIRENT_TAIL(block_start,
						     fs->blocksize);
				ext2fs_initialize_dirent_tail(fs, t);
			}
			if ((retval = get_next_block(fs, outdir,
						      &block_start)))
				return retval;
			offset = 0;
		}
		left = (fs->blocksize - csum_size) - offset;
		dirent = (struct ext2_dir_entry *) (block_start + offset);
		if (offset == 0) {
			if (ent->hash == prev_hash)
				outdir->hashes[outdir->num-1] = ent->hash | 1;
			else
				outdir->hashes[outdir->num-1] = ent->hash;
		}
		dirent->inode = ent->dir->inode;
		ext2fs_dirent_set_name_len(dirent,
					   ext2fs_dirent_name_len(ent->dir));
		ext2fs_dirent_set_file_type(dirent,
					    ext2fs_dirent_file_type(ent->dir));
		retval = ext2fs_set_rec_len(fs, rec_len, dirent);
		if (retval)
			return retval;
		prev_rec_len = rec_len;
		memcpy(dirent->name, ent->dir->name,
		       ext2fs_dirent_name_len(dirent));
		offset += rec_len;
		left -= rec_len;
		if (left < slack) {
			prev_rec_len += left;
			retval = ext2fs_set_rec_len(fs, prev_rec_len, dirent);
			if (retval)
				return retval;
			offset += left;
			left = 0;
		}
		prev_hash = ent->hash;
	}
	if (left)
		retval = ext2fs_set_rec_len(fs, rec_len + left, dirent);
	if (csum_size) {
		t = EXT2_DIRENT_TAIL(block_start, fs->blocksize);
		ext2fs_initialize_dirent_tail(fs, t);
	}

	return retval;
}
Exemplo n.º 2
0
static int link_proc(struct ext2_dir_entry *dirent,
		     int	offset,
		     int	blocksize,
		     char	*buf,
		     void	*priv_data)
{
	struct link_struct *ls = (struct link_struct *) priv_data;
	struct ext2_dir_entry *next;
	unsigned int rec_len, min_rec_len, curr_rec_len;
	int ret = 0;
	int csum_size = 0;
	struct ext2_dir_entry_tail *t;

	if (ls->done)
		return DIRENT_ABORT;

	rec_len = EXT2_DIR_REC_LEN(ls->namelen);

	ls->err = ext2fs_get_rec_len(ls->fs, dirent, &curr_rec_len);
	if (ls->err)
		return DIRENT_ABORT;

	if (EXT2_HAS_RO_COMPAT_FEATURE(ls->fs->super,
				       EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
		csum_size = sizeof(struct ext2_dir_entry_tail);
	/*
	 * See if the following directory entry (if any) is unused;
	 * if so, absorb it into this one.
	 */
	next = (struct ext2_dir_entry *) (buf + offset + curr_rec_len);
	if ((offset + (int) curr_rec_len < blocksize - (8 + csum_size)) &&
	    (next->inode == 0) &&
	    (offset + (int) curr_rec_len + (int) next->rec_len <= blocksize)) {
		curr_rec_len += next->rec_len;
		ls->err = ext2fs_set_rec_len(ls->fs, curr_rec_len, dirent);
		if (ls->err)
			return DIRENT_ABORT;
		ret = DIRENT_CHANGED;
	}

	/*
	 * Since ext2fs_link blows away htree data, we need to be
	 * careful -- if metadata_csum is enabled and we're passed in
	 * a dirent that contains htree data, we need to create the
	 * fake entry at the end of the block that hides the checksum.
	 */

	/* De-convert a dx_node block */
	if (csum_size &&
	    curr_rec_len == ls->fs->blocksize &&
	    !dirent->inode) {
		curr_rec_len -= csum_size;
		ls->err = ext2fs_set_rec_len(ls->fs, curr_rec_len, dirent);
		if (ls->err)
			return DIRENT_ABORT;
		t = EXT2_DIRENT_TAIL(buf, ls->fs->blocksize);
		ext2fs_initialize_dirent_tail(ls->fs, t);
		ret = DIRENT_CHANGED;
	}

	/* De-convert a dx_root block */
	if (csum_size &&
	    curr_rec_len == ls->fs->blocksize - EXT2_DIR_REC_LEN(1) &&
	    offset == EXT2_DIR_REC_LEN(1) &&
	    dirent->name[0] == '.' && dirent->name[1] == '.') {
		curr_rec_len -= csum_size;
		ls->err = ext2fs_set_rec_len(ls->fs, curr_rec_len, dirent);
		if (ls->err)
			return DIRENT_ABORT;
		t = EXT2_DIRENT_TAIL(buf, ls->fs->blocksize);
		ext2fs_initialize_dirent_tail(ls->fs, t);
		ret = DIRENT_CHANGED;
	}

	/*
	 * If the directory entry is used, see if we can split the
	 * directory entry to make room for the new name.  If so,
	 * truncate it and return.
	 */
	if (dirent->inode) {
		min_rec_len = EXT2_DIR_REC_LEN(ext2fs_dirent_name_len(dirent));
		if (curr_rec_len < (min_rec_len + rec_len))
			return ret;
		rec_len = curr_rec_len - min_rec_len;
		ls->err = ext2fs_set_rec_len(ls->fs, min_rec_len, dirent);
		if (ls->err)
			return DIRENT_ABORT;
		next = (struct ext2_dir_entry *) (buf + offset +
						  dirent->rec_len);
		next->inode = 0;
		ext2fs_dirent_set_name_len(next, 0);
		ext2fs_dirent_set_file_type(next, 0);
		ls->err = ext2fs_set_rec_len(ls->fs, rec_len, next);
		if (ls->err)
			return DIRENT_ABORT;
		return DIRENT_CHANGED;
	}

	/*
	 * If we get this far, then the directory entry is not used.
	 * See if we can fit the request entry in.  If so, do it.
	 */
	if (curr_rec_len < rec_len)
		return ret;
	dirent->inode = ls->inode;
	ext2fs_dirent_set_name_len(dirent, ls->namelen);
	strncpy(dirent->name, ls->name, ls->namelen);
	if (ls->sb->s_feature_incompat & EXT2_FEATURE_INCOMPAT_FILETYPE)
		ext2fs_dirent_set_file_type(dirent, ls->flags & 0x7);

	ls->done++;
	return DIRENT_ABORT|DIRENT_CHANGED;
}
Exemplo n.º 3
0
static errcode_t ext2fs_inline_data_convert_dir(ext2_filsys fs, ext2_ino_t ino,
        char *bbuf, char *ibuf, int size)
{
    struct ext2_dir_entry *dir, *dir2;
    struct ext2_dir_entry_tail *t;
    errcode_t retval;
    unsigned int offset, rec_len;
    int csum_size = 0;
    int filetype = 0;

    if (EXT2_HAS_RO_COMPAT_FEATURE(fs->super,
                                   EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
        csum_size = sizeof(struct ext2_dir_entry_tail);

    /* Create '.' and '..' */
    if (EXT2_HAS_INCOMPAT_FEATURE(fs->super,
                                  EXT2_FEATURE_INCOMPAT_FILETYPE))
        filetype = EXT2_FT_DIR;

    /*
     * Set up entry for '.'
     */
    dir = (struct ext2_dir_entry *) bbuf;
    dir->inode = ino;
    ext2fs_dirent_set_name_len(dir, 1);
    ext2fs_dirent_set_file_type(dir, filetype);
    dir->name[0] = '.';
    rec_len = (fs->blocksize - csum_size) - EXT2_DIR_REC_LEN(1);
    dir->rec_len = EXT2_DIR_REC_LEN(1);

    /*
     * Set up entry for '..'
     */
    dir = (struct ext2_dir_entry *) (bbuf + dir->rec_len);
    dir->rec_len = EXT2_DIR_REC_LEN(2);
    dir->inode = ext2fs_le32_to_cpu(((__u32 *)ibuf)[0]);
    ext2fs_dirent_set_name_len(dir, 2);
    ext2fs_dirent_set_file_type(dir, filetype);
    dir->name[0] = '.';
    dir->name[1] = '.';

    /*
     * Ajust the last rec_len
     */
    offset = EXT2_DIR_REC_LEN(1) + EXT2_DIR_REC_LEN(2);
    dir = (struct ext2_dir_entry *) (bbuf + offset);
    memcpy(bbuf + offset, ibuf + EXT4_INLINE_DATA_DOTDOT_SIZE,
           size - EXT4_INLINE_DATA_DOTDOT_SIZE);
    size += EXT2_DIR_REC_LEN(1) + EXT2_DIR_REC_LEN(2) -
            EXT4_INLINE_DATA_DOTDOT_SIZE;

    do {
        dir2 = dir;
        retval = ext2fs_get_rec_len(fs, dir, &rec_len);
        if (retval)
            goto err;
        offset += rec_len;
        dir = (struct ext2_dir_entry *) (bbuf + offset);
    } while (offset < size);
    rec_len += fs->blocksize - csum_size - offset;
    retval = ext2fs_set_rec_len(fs, rec_len, dir2);
    if (retval)
        goto err;

    if (csum_size) {
        t = EXT2_DIRENT_TAIL(bbuf, fs->blocksize);
        ext2fs_initialize_dirent_tail(fs, t);
    }

err:
    return retval;
}
Exemplo n.º 4
0
/*
 * Create new directory block
 */
errcode_t ext2fs_new_dir_block(ext2_filsys fs, ext2_ino_t dir_ino,
			       ext2_ino_t parent_ino, char **block)
{
	struct ext2_dir_entry 	*dir = NULL;
	errcode_t		retval;
	char			*buf;
	int			rec_len;
	int			filetype = 0;
	struct ext2_dir_entry_tail	*t;
	int			csum_size = 0;

	EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);

	retval = ext2fs_get_mem(fs->blocksize, &buf);
	if (retval)
		return retval;
	memset(buf, 0, fs->blocksize);
	dir = (struct ext2_dir_entry *) buf;

	if (EXT2_HAS_RO_COMPAT_FEATURE(fs->super,
				       EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
		csum_size = sizeof(struct ext2_dir_entry_tail);

	retval = ext2fs_set_rec_len(fs, fs->blocksize - csum_size, dir);
	if (retval)
		return retval;

	if (dir_ino) {
		if (fs->super->s_feature_incompat &
		    EXT2_FEATURE_INCOMPAT_FILETYPE)
			filetype = EXT2_FT_DIR;
		/*
		 * Set up entry for '.'
		 */
		dir->inode = dir_ino;
		ext2fs_dirent_set_name_len(dir, 1);
		ext2fs_dirent_set_file_type(dir, filetype);
		dir->name[0] = '.';
		rec_len = (fs->blocksize - csum_size) - EXT2_DIR_REC_LEN(1);
		dir->rec_len = EXT2_DIR_REC_LEN(1);

		/*
		 * Set up entry for '..'
		 */
		dir = (struct ext2_dir_entry *) (buf + dir->rec_len);
		retval = ext2fs_set_rec_len(fs, rec_len, dir);
		if (retval)
			return retval;
		dir->inode = parent_ino;
		ext2fs_dirent_set_name_len(dir, 2);
		ext2fs_dirent_set_file_type(dir, filetype);
		dir->name[0] = '.';
		dir->name[1] = '.';

	}

	if (csum_size) {
		t = EXT2_DIRENT_TAIL(buf, fs->blocksize);
		ext2fs_initialize_dirent_tail(fs, t);
	}
	*block = buf;
	return 0;
}