示例#1
0
/*
 * Migrate a simple extent-based inode to use the i_blocks[] array
 */
int ext4_ind_migrate(struct inode *inode)
{
	struct ext4_extent_header	*eh;
	struct ext4_super_block		*es = EXT4_SB(inode->i_sb)->s_es;
	struct ext4_inode_info		*ei = EXT4_I(inode);
	struct ext4_extent		*ex;
	unsigned int			i, len;
	ext4_fsblk_t			blk;
	handle_t			*handle;
	int				ret;

	if (!EXT4_HAS_INCOMPAT_FEATURE(inode->i_sb,
				       EXT4_FEATURE_INCOMPAT_EXTENTS) ||
	    (!ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)))
		return -EINVAL;

	if (EXT4_HAS_RO_COMPAT_FEATURE(inode->i_sb,
				       EXT4_FEATURE_RO_COMPAT_BIGALLOC))
		return -EOPNOTSUPP;

	handle = ext4_journal_start(inode, EXT4_HT_MIGRATE, 1);
	if (IS_ERR(handle))
		return PTR_ERR(handle);

	down_write(&EXT4_I(inode)->i_data_sem);
	ret = ext4_ext_check_inode(inode);
	if (ret)
		goto errout;

	eh = ext_inode_hdr(inode);
	ex  = EXT_FIRST_EXTENT(eh);
	if (ext4_blocks_count(es) > EXT4_MAX_BLOCK_FILE_PHYS ||
	    eh->eh_depth != 0 || le16_to_cpu(eh->eh_entries) > 1) {
		ret = -EOPNOTSUPP;
		goto errout;
	}
	if (eh->eh_entries == 0)
		blk = len = 0;
	else {
		len = le16_to_cpu(ex->ee_len);
		blk = ext4_ext_pblock(ex);
		if (len > EXT4_NDIR_BLOCKS) {
			ret = -EOPNOTSUPP;
			goto errout;
		}
	}

	ext4_clear_inode_flag(inode, EXT4_INODE_EXTENTS);
	memset(ei->i_data, 0, sizeof(ei->i_data));
	for (i=0; i < len; i++)
		ei->i_data[i] = cpu_to_le32(blk++);
	ext4_mark_inode_dirty(handle, inode);
errout:
	ext4_journal_stop(handle);
	up_write(&EXT4_I(inode)->i_data_sem);
	return ret;
}
示例#2
0
int ext4_encrypted_zeroout(struct inode *inode, struct ext4_extent *ex)
{
	struct ext4_crypto_ctx	*ctx;
	struct page		*ciphertext_page = NULL;
	struct bio		*bio;
	ext4_lblk_t		lblk = ex->ee_block;
	ext4_fsblk_t		pblk = ext4_ext_pblock(ex);
	unsigned int		len = ext4_ext_get_actual_len(ex);
	int			err = 0;

	BUG_ON(inode->i_sb->s_blocksize != PAGE_CACHE_SIZE);

	ctx = ext4_get_crypto_ctx(inode);
	if (IS_ERR(ctx))
		return PTR_ERR(ctx);

	ciphertext_page = alloc_bounce_page(ctx);
	if (IS_ERR(ciphertext_page)) {
		err = PTR_ERR(ciphertext_page);
		goto errout;
	}

	while (len--) {
		err = ext4_page_crypto(ctx, inode, EXT4_ENCRYPT, lblk,
				       ZERO_PAGE(0), ciphertext_page);
		if (err)
			goto errout;

		bio = bio_alloc(GFP_KERNEL, 1);
		if (!bio) {
			err = -ENOMEM;
			goto errout;
		}
		bio->bi_bdev = inode->i_sb->s_bdev;
		bio->bi_sector = pblk;
		err = bio_add_page(bio, ciphertext_page,
				   inode->i_sb->s_blocksize, 0);
		if (err) {
			bio_put(bio);
			goto errout;
		}
		err = submit_bio_wait(WRITE, bio);
		bio_put(bio);
		if (err)
			goto errout;
	}
	err = 0;
errout:
	ext4_release_crypto_ctx(ctx);
	return err;
}
示例#3
0
文件: crypto.c 项目: Chong-Li/cse522
int ext4_encrypted_zeroout(struct inode *inode, struct ext4_extent *ex)
{
	struct ext4_crypto_ctx	*ctx;
	struct page		*ciphertext_page = NULL;
	struct bio		*bio;
	ext4_lblk_t		lblk = le32_to_cpu(ex->ee_block);
	ext4_fsblk_t		pblk = ext4_ext_pblock(ex);
	unsigned int		len = ext4_ext_get_actual_len(ex);
	int			ret, err = 0;

#if 0
	ext4_msg(inode->i_sb, KERN_CRIT,
		 "ext4_encrypted_zeroout ino %lu lblk %u len %u",
		 (unsigned long) inode->i_ino, lblk, len);
#endif

	BUG_ON(inode->i_sb->s_blocksize != PAGE_CACHE_SIZE);

	ctx = ext4_get_crypto_ctx(inode);
	if (IS_ERR(ctx))
		return PTR_ERR(ctx);

	ciphertext_page = alloc_bounce_page(ctx);
	if (IS_ERR(ciphertext_page)) {
		err = PTR_ERR(ciphertext_page);
		goto errout;
	}

	while (len--) {
		err = ext4_page_crypto(inode, EXT4_ENCRYPT, lblk,
				       ZERO_PAGE(0), ciphertext_page);
		if (err)
			goto errout;

		bio = bio_alloc(GFP_KERNEL, 1);
		if (!bio) {
			err = -ENOMEM;
			goto errout;
		}
		bio->bi_bdev = inode->i_sb->s_bdev;
		bio->bi_iter.bi_sector =
			pblk << (inode->i_sb->s_blocksize_bits - 9);
		ret = bio_add_page(bio, ciphertext_page,
				   inode->i_sb->s_blocksize, 0);
		if (ret != inode->i_sb->s_blocksize) {
			/* should never happen! */
			ext4_msg(inode->i_sb, KERN_ERR,
				 "bio_add_page failed: %d", ret);
			WARN_ON(1);
			bio_put(bio);
			err = -EIO;
			goto errout;
		}
		err = submit_bio_wait(WRITE, bio);
		if ((err == 0) && bio->bi_error)
			err = -EIO;
		bio_put(bio);
		if (err)
			goto errout;
		lblk++; pblk++;
	}
	err = 0;
errout:
	ext4_release_crypto_ctx(ctx);
	return err;
}
示例#4
0
/*
 * Migrate a simple extent-based inode to use the i_blocks[] array
 */
int ext4_ind_migrate(struct inode *inode)
{
	struct ext4_extent_header	*eh;
	struct ext4_super_block		*es = EXT4_SB(inode->i_sb)->s_es;
	struct ext4_inode_info		*ei = EXT4_I(inode);
	struct ext4_extent		*ex;
	unsigned int			i, len;
	ext4_lblk_t			start, end;
	ext4_fsblk_t			blk;
	handle_t			*handle;
	int				ret;

	if (!EXT4_HAS_INCOMPAT_FEATURE(inode->i_sb,
				       EXT4_FEATURE_INCOMPAT_EXTENTS) ||
	    (!ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)))
		return -EINVAL;

	if (EXT4_HAS_RO_COMPAT_FEATURE(inode->i_sb,
				       EXT4_FEATURE_RO_COMPAT_BIGALLOC))
		return -EOPNOTSUPP;

	/*
	 * In order to get correct extent info, force all delayed allocation
	 * blocks to be allocated, otherwise delayed allocation blocks may not
	 * be reflected and bypass the checks on extent header.
	 */
	if (test_opt(inode->i_sb, DELALLOC))
		ext4_alloc_da_blocks(inode);

	handle = ext4_journal_start(inode, EXT4_HT_MIGRATE, 1);
	if (IS_ERR(handle))
		return PTR_ERR(handle);

	down_write(&EXT4_I(inode)->i_data_sem);
	ret = ext4_ext_check_inode(inode);
	if (ret)
		goto errout;

	eh = ext_inode_hdr(inode);
	ex  = EXT_FIRST_EXTENT(eh);
	if (ext4_blocks_count(es) > EXT4_MAX_BLOCK_FILE_PHYS ||
	    eh->eh_depth != 0 || le16_to_cpu(eh->eh_entries) > 1) {
		ret = -EOPNOTSUPP;
		goto errout;
	}
	if (eh->eh_entries == 0)
		blk = len = start = end = 0;
	else {
		len = le16_to_cpu(ex->ee_len);
		blk = ext4_ext_pblock(ex);
		start = le32_to_cpu(ex->ee_block);
		end = start + len - 1;
		if (end >= EXT4_NDIR_BLOCKS) {
			ret = -EOPNOTSUPP;
			goto errout;
		}
	}

	ext4_clear_inode_flag(inode, EXT4_INODE_EXTENTS);
	memset(ei->i_data, 0, sizeof(ei->i_data));
	for (i = start; i <= end; i++)
		ei->i_data[i] = cpu_to_le32(blk++);
	ext4_mark_inode_dirty(handle, inode);
errout:
	ext4_journal_stop(handle);
	up_write(&EXT4_I(inode)->i_data_sem);
	return ret;
}