linux-ext4 - Re: [PATCH 01/31] tune2fs: Don't convert block # to cluster # when clearing uninit

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Message-ID: <alpine.LFD.2.00.1310031848270.1947@localhost.localdomain>
Date:	Thu, 3 Oct 2013 18:53:38 +0200 (CEST)
From:	Lukáš Czerner <lczerner@...hat.com>
To:	"Darrick J. Wong" <darrick.wong@...cle.com>
cc:	tytso@....edu, linux-ext4@...r.kernel.org
Subject: Re: [PATCH 01/31] tune2fs: Don't convert block # to cluster # when
 clearing uninit_bg

On Mon, 30 Sep 2013, Darrick J. Wong wrote:

> Date: Mon, 30 Sep 2013 18:26:49 -0700
> From: Darrick J. Wong <darrick.wong@...cle.com>
> To: tytso@....edu, darrick.wong@...cle.com
> Cc: linux-ext4@...r.kernel.org
> Subject: [PATCH 01/31] tune2fs: Don't convert block # to cluster # when
>     clearing uninit_bg
> 
> When we're constructing the initial block bitmap as part of removing the
> gdt_csum (i.e. uninit_bg) feature, we mustn't convert the block numbers to
> cluster numbers because ext2fs_mark_block_bitmap2() does this for us.

I wonder if it's possible to use the old-style bitmap interface (the
one which does not understand 64-bit bitmaps). If so, then you also
need to fix ext2fs_mark_generic_bmap() (and others) so that we
convert blocks to clusters if needed.

Thanks!
-Lukas

> 
> Signed-off-by: Darrick J. Wong <darrick.wong@...cle.com>
> ---
>  misc/tune2fs.c |   13 +++++--------
>  1 file changed, 5 insertions(+), 8 deletions(-)
> 
> 
> diff --git a/misc/tune2fs.c b/misc/tune2fs.c
> index ddf3259..52247e0 100644
> --- a/misc/tune2fs.c
> +++ b/misc/tune2fs.c
> @@ -820,20 +820,17 @@ static void disable_uninit_bg(ext2_filsys fs, __u32 csum_feature_flag)
>  	/* The bbitmap is zeroed; we must mark group metadata blocks in use */
>  	for (i = 0; i < fs->group_desc_count; i++) {
>  		b = ext2fs_block_bitmap_loc(fs, i);
> -		ext2fs_mark_block_bitmap2(fs->block_map, EXT2FS_B2C(fs, b));
> +		ext2fs_mark_block_bitmap2(fs->block_map, b);
>  		b = ext2fs_inode_bitmap_loc(fs, i);
> -		ext2fs_mark_block_bitmap2(fs->block_map, EXT2FS_B2C(fs, b));
> +		ext2fs_mark_block_bitmap2(fs->block_map, b);
>  
>  		retval = ext2fs_super_and_bgd_loc2(fs, i, &b, &c, &d, NULL);
>  		if (retval == 0 && b)
> -			ext2fs_mark_block_bitmap2(fs->block_map,
> -						  EXT2FS_B2C(fs, b));
> +			ext2fs_mark_block_bitmap2(fs->block_map, b);
>  		if (retval == 0 && c)
> -			ext2fs_mark_block_bitmap2(fs->block_map,
> -						  EXT2FS_B2C(fs, c));
> +			ext2fs_mark_block_bitmap2(fs->block_map, c);
>  		if (retval == 0 && d)
> -			ext2fs_mark_block_bitmap2(fs->block_map,
> -						  EXT2FS_B2C(fs, d));
> +			ext2fs_mark_block_bitmap2(fs->block_map, d);
>  		if (retval) {
>  			com_err("disable_uninit_bg", retval,
>  				"while initializing block bitmaps");
> 
> --
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