linux-ext4 - Re: [PATCH 3/4 v3] e2image: Support for conversion QCOW2 image into raw

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Date:	Wed, 18 May 2011 14:23:07 +0200 (CEST)
From:	Lukas Czerner <lczerner@...hat.com>
To:	Lukas Czerner <lczerner@...hat.com>
cc:	linux-ext4@...r.kernel.org, tytso@....edu, sandeen@...hat.com,
	adilger@...ger.ca
Subject: Re: [PATCH 3/4 v3] e2image: Support for conversion QCOW2 image into
 raw

On Wed, 18 May 2011, Lukas Czerner wrote:

> This commit adds support for converting QCOW2 image created previously
> with e2image into raw image. The QCOW2 image is detected automatically,
> so there is not new option. Just use following command:
> 
>   e2image -r image.qcow image.raw
> 
> No that this tool is aimed to quickly convert qcow2 image created with
> e2image into raw image. In order to improve speed we are doing some
> assumption I believe might not be true for regular qcow2 images. So it
> was not tested with regular QCOW2 images and it might not work with
> them. The intention of this tool is only convert images previously
> created by e2image.
> 
> Note that there is nothing special with QCOW2 images created by e2images
> and it can be used with tools like qemu-img, or qemu-nbd without any
> problems.
> 
> Signed-off-by: Lukas Czerner <lczerner@...hat.com>
> ---
>  misc/e2image.8.in |    4 ++++
>  misc/e2image.c    |   48 +++++++++++++++++++++++++++++++++++++++++++++++-
>  2 files changed, 51 insertions(+), 1 deletions(-)
> 
> diff --git a/misc/e2image.8.in b/misc/e2image.8.in
> index 4a28580..6f31dd1 100644
> --- a/misc/e2image.8.in
> +++ b/misc/e2image.8.in
> @@ -131,6 +131,10 @@ the
>  option will prevent analysis of problems related to hash-tree indexed
>  directories.
>  .PP
> +Note that this will work even if you substitute "/dev/hda1" for another raw
> +disk image, or QCOW2 image previously created by
> +.BR e2image .
> +.PP
>  .SH QCOW2 IMAGE FILES
>  The 
>  .B \-Q
> diff --git a/misc/e2image.c b/misc/e2image.c
> index dbf4421..0a1b1f5 100644
> --- a/misc/e2image.c
> +++ b/misc/e2image.c
> @@ -1213,16 +1213,33 @@ static void install_image(char *device, char *image_fn, int type)
>  	exit (0);
>  }
>  
> +static struct ext2_qcow2_hdr *check_qcow2_image(int *fd, char *name)
> +{
> +
> +#ifdef HAVE_OPEN64
> +	*fd = open64(name, O_RDONLY, 0600);
> +#else
> +	*fd = open(name, O_RDONLY, 0600);
> +#endif
> +	if (*fd < 0)
> +		return NULL;
> +
> +	return qcow2_read_header(*fd);
> +}
> +
>  int main (int argc, char ** argv)
>  {
>  	int c;
>  	errcode_t retval;
>  	ext2_filsys fs;
>  	char *image_fn;
> +	struct ext2_qcow2_hdr *header = NULL;
>  	int open_flag = EXT2_FLAG_64BITS;
>  	int img_type = 0;
>  	int flags = 0;
> +	int qcow2_fd = 0;
>  	int fd = 0;
> +	int ret = 0;
>  
>  #ifdef ENABLE_NLS
>  	setlocale(LC_MESSAGES, "");
> @@ -1266,6 +1283,14 @@ int main (int argc, char ** argv)
>  		exit (0);
>  	}
>  
> +	if (img_type & E2IMAGE_RAW) {
> +		header = check_qcow2_image(&qcow2_fd, device_name);
> +		if (header) {
> +			flags |= E2IMAGE_IS_QCOW2_FLAG;
> +			goto skip_device;
> +		}
> +	}
> +
>  	retval = ext2fs_open (device_name, open_flag, 0, 0,
>  			      unix_io_manager, &fs);
>          if (retval) {
> @@ -1275,6 +1300,7 @@ int main (int argc, char ** argv)
>  		exit(1);
>  	}
>  
> +skip_device:
>  	if (strcmp(image_fn, "-") == 0)
>  		fd = 1;
>  	else {
> @@ -1296,12 +1322,32 @@ int main (int argc, char ** argv)
>  		exit(1);
>  	}
>  
> +	if (flags & E2IMAGE_IS_QCOW2_FLAG) {
> +		ret = qcow2_write_raw_image(qcow2_fd, fd, header);
> +		if (ret)
> +			if (ret == -QCOW_COMPRESSED)
> +				fprintf(stderr, "Image (%s) is compressed\n");
> +			if (ret == -QCOW_ENCRYPTED)
> +				fprintf(stderr, "Image (%s) is encrypted\n");
> +			com_err(program_name, ret,
> +				_("while trying to convert qcow2 image"
> +				" (%s) into raw image (%s)"),
> +				device_name, image_fn);

I have forgot braces. Fixed in v4.

> +		goto out;
> +	}
> +
> +
>  	if (img_type)
>  		write_raw_image_file(fs, fd, img_type, flags);
>  	else
>  		write_image_file(fs, fd);
>  
>  	ext2fs_close (fs);
> +out:
> +	if (header)
> +		free(header);
> +	if (qcow2_fd)
> +		close(qcow2_fd);
>  	remove_error_table(&et_ext2_error_table);
> -	exit (0);
> +	return ret;
>  }
> 

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