[v4,1/4] ext2fs: opening filesystem code refactoring

There are similar opening filesystem code in different utilities.

The patch moves this code to ext2fs_try_open_fs().
This function make one of the action based on parameters:
1) open filesystem with given superblock, superblock size
2) open filesystem with given superblock, but try to
find right block size
3) open filesystem with default superblock and block size

Signed-off-by: Artem Blagodarenko <artem.blagodarenko@gmail.com>
---
 e2fsck/unix.c       | 28 +++-------------------------
 lib/ext2fs/openfs.c | 36 +++++++++++++++++++++++++++++++++++-
 misc/dumpe2fs.c     | 17 +++--------------
 3 files changed, 41 insertions(+), 40 deletions(-)

On May 25, 2018, at 6:42 AM, Artem Blagodarenko <artem.blagodarenko@gmail.com> wrote:
> 
> There are similar opening filesystem code in different utilities.
> 
> The patch moves this code to ext2fs_try_open_fs().

I think the patch is fine, but this comment is not consistent with the
actual patch.  It is moving the improved handling *from* try_open_fs()
into ext2fs_open().

> This function make one of the action based on parameters:
> 1) open filesystem with given superblock, superblock size
> 2) open filesystem with given superblock, but try to
> find right block size
> 3) open filesystem with default superblock and block size
> 
> Signed-off-by: Artem Blagodarenko <artem.blagodarenko@gmail.com>

Aside from minor whitespace and comment cleanup, you can add:

Reviewed-by: Andreas Dilger <adilger@dilger.ca>

> ---
> e2fsck/unix.c       | 28 +++-------------------------
> lib/ext2fs/openfs.c | 36 +++++++++++++++++++++++++++++++++++-
> misc/dumpe2fs.c     | 17 +++--------------
> 3 files changed, 41 insertions(+), 40 deletions(-)
> 
> diff --git a/e2fsck/unix.c b/e2fsck/unix.c
> index cbe5ec50..491e9eb6 100644
> --- a/e2fsck/unix.c
> +++ b/e2fsck/unix.c
> @@ -1142,31 +1142,9 @@ static errcode_t try_open_fs(e2fsck_t ctx, int flags, io_manager io_ptr,
> 			     ext2_filsys *ret_fs)
> {
> 	errcode_t retval;
> -
> -	*ret_fs = NULL;
> -	if (ctx->superblock && ctx->blocksize) {
> -		retval = ext2fs_open2(ctx->filesystem_name, ctx->io_options,
> -				      flags, ctx->superblock, ctx->blocksize,
> -				      io_ptr, ret_fs);
> -	} else if (ctx->superblock) {
> -		int blocksize;
> -		for (blocksize = EXT2_MIN_BLOCK_SIZE;
> -		     blocksize <= EXT2_MAX_BLOCK_SIZE; blocksize *= 2) {
> -			if (*ret_fs) {
> -				ext2fs_free(*ret_fs);
> -				*ret_fs = NULL;
> -			}
> -			retval = ext2fs_open2(ctx->filesystem_name,
> -					      ctx->io_options, flags,
> -					      ctx->superblock, blocksize,
> -					      io_ptr, ret_fs);
> -			if (!retval)
> -				break;
> -		}
> -	} else
> -		retval = ext2fs_open2(ctx->filesystem_name, ctx->io_options,
> -				      flags, 0, 0, io_ptr, ret_fs);
> -
> +	retval = ext2fs_open2(ctx->filesystem_name, ctx->io_options,
> +			   flags, ctx->superblock, ctx->blocksize,
> +			   io_ptr, ret_fs);
> 	if (retval == 0) {
> 		(*ret_fs)->priv_data = ctx;
> 		e2fsck_set_bitmap_type(*ret_fs, EXT2FS_BMAP64_RBTREE,
> diff --git a/lib/ext2fs/openfs.c b/lib/ext2fs/openfs.c
> index 532e70f7..d18e1ad2 100644
> --- a/lib/ext2fs/openfs.c
> +++ b/lib/ext2fs/openfs.c
> @@ -108,7 +108,7 @@ errcode_t ext2fs_open(const char *name, int flags, int superblock,
>  *	EXT2_FLAG_64BITS - Allow 64-bit bitfields (needed for large
>  *				filesystems)
>  */
> -errcode_t ext2fs_open2(const char *name, const char *io_options,
> +static errcode_t __ext2fs_open2(const char *name, const char *io_options,
> 		       int flags, int superblock,
> 		       unsigned int block_size, io_manager manager,
> 		       ext2_filsys *ret_fs)
> @@ -504,6 +504,40 @@ cleanup:
> 	return retval;
> }
> 
> +errcode_t ext2fs_open2(const char *name, const char *io_options,
> +		       int flags, int superblock,
> +		       unsigned int block_size, io_manager manager,
> +		       ext2_filsys *ret_fs)
> +{
> +	errcode_t retval;
> +
> +	*ret_fs = NULL;
> +	if (superblock && block_size) {
> +		retval = __ext2fs_open2(name, io_options,
> +				      flags, superblock, block_size,

(style) align after '(' on previous line

> +				      manager, ret_fs);

> +	} else if (superblock) {
> +		int block_size;
> +
> +		for (block_size = EXT2_MIN_BLOCK_SIZE;
> +		     block_size <= EXT2_MAX_BLOCK_SIZE; block_size *= 2) {
> +			if (*ret_fs) {
> +				ext2fs_free(*ret_fs);
> +				*ret_fs = NULL;
> +			}
> +			retval = __ext2fs_open2(name,
> +					      io_options, flags,

(style) align after '(' on previous line

> +					      superblock, block_size,
> +					      manager, ret_fs);
> +			if (!retval)
> +				break;
> +		}
> +	} else
> +		retval = __ext2fs_open2(name, io_options,
> +				      flags, 0, 0, manager, ret_fs);

(style) align after '(' on previous line
(style) consistent {} around all branches of if/else block

> +	return retval;
> +}
> +
> /*
>  * Set/get the filesystem data I/O channel.
>  *
> diff --git a/misc/dumpe2fs.c b/misc/dumpe2fs.c
> index 395ea9ee..6c4d7965 100644
> --- a/misc/dumpe2fs.c
> +++ b/misc/dumpe2fs.c
> @@ -568,20 +568,9 @@ int main (int argc, char ** argv)
> 	if (image_dump)
> 		flags |= EXT2_FLAG_IMAGE_FILE;
> try_open_again:
> -	if (use_superblock && !use_blocksize) {
> -		for (use_blocksize = EXT2_MIN_BLOCK_SIZE;
> -		     use_blocksize <= EXT2_MAX_BLOCK_SIZE;
> -		     use_blocksize *= 2) {
> -			retval = ext2fs_open (device_name, flags,
> -					      use_superblock,
> -					      use_blocksize, unix_io_manager,
> -					      &fs);
> -			if (!retval)
> -				break;
> -		}
> -	} else
> -		retval = ext2fs_open (device_name, flags, use_superblock,
> -				      use_blocksize, unix_io_manager, &fs);
> +	retval = ext2fs_open2(device_name, 0,
> +				    flags, use_superblock, use_blocksize,
> +				    unix_io_manager, &fs);
> 	if (retval && !(flags & EXT2_FLAG_IGNORE_CSUM_ERRORS)) {
> 		flags |= EXT2_FLAG_IGNORE_CSUM_ERRORS;
> 		goto try_open_again;
> --
> 2.14.3
> 


Cheers, Andreas