linux-ext4 - Re: [PATCH]mke2fs: Calculate journal blocks just after fs initialize

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Date:	Wed, 5 Jun 2013 13:55:31 +0530
From:	Ashish Sangwan <ashishsangwan2@...il.com>
To:	"Theodore Ts'o" <tytso@....edu>, adilger@...ger.ca
Cc:	ext4 development <linux-ext4@...r.kernel.org>,
	Ashish Sangwan <a.sangwan@...sung.com>,
	Namjae Jeon <namjae.jeon@...sung.com>
Subject: Re: [PATCH]mke2fs: Calculate journal blocks just after fs initialize

any comments?

On Sat, May 11, 2013 at 9:12 AM, Ashish Sangwan
<ashishsangwan2@...il.com> wrote:
> From: Ashish Sangwan <a.sangwan@...sung.com>
>
> We can calculate journal blocks as soon as blocksize is set.
> It will help to figure out wrong journal blocks count earlier.
> This will save some un-necessary initialization.
>
> Without patch output =>
> mke2fs /dev/sdc1 -J size=1048576
> mke2fs 1.42.7 (21-Jan-2013)
> Filesystem label=
> OS type: Linux
> Block size=4096 (log=2)
> Fragment size=4096 (log=2)
> Stride=0 blocks, Stripe width=0 blocks
> 61312 inodes, 244936 blocks
> 12246 blocks (5.00%) reserved for the super user
> First data block=0
> Maximum filesystem blocks=251658240
> 8 block groups
> 32768 blocks per group, 32768 fragments per group
> 7664 inodes per group
> Superblock backups stored on blocks:
>         32768, 98304, 163840, 229376
>
> Allocating group tables: done
> Writing inode tables: done
>
> The requested journal size is 268435456 blocks; it must be
> between 1024 and 10240000 blocks.  Aborting.
>
>
> With patch output =>
> mke2fs /dev/sdc1 -J size=1048576
> mke2fs 1.42.7 (21-Jan-2013)
>
> The requested journal size is 268435456 blocks; it must be
> between 1024 and 10240000 blocks.  Aborting.
>
> Signed-off-by: Ashish Sangwan <a.sangwan@...sung.com>
> Signed-off-by: Namjae Jeon <namjae.jeon@...sung.com>
> ---
>  misc/mke2fs.c |    8 ++++++--
>  1 files changed, 6 insertions(+), 2 deletions(-)
>
> diff --git a/misc/mke2fs.c b/misc/mke2fs.c
> index bbf477a..0232053 100644
> --- a/misc/mke2fs.c
> +++ b/misc/mke2fs.c
> @@ -2407,6 +2407,12 @@ int main (int argc, char *argv[])
>                 com_err(device_name, retval, _("while setting up superblock"));
>                 exit(1);
>         }
> +
> +       /* Calculate journal blocks */
> +       if (!journal_device && ((journal_size) ||
> +               (fs_param.s_feature_compat &
> +                EXT3_FEATURE_COMPAT_HAS_JOURNAL)))
> +               journal_blocks = figure_journal_size(journal_size, fs);
>         fs->progress_ops = &ext2fs_numeric_progress_ops;
>
>         /* Check the user's mkfs options for metadata checksumming */
> @@ -2683,8 +2689,6 @@ int main (int argc, char *argv[])
>         } else if ((journal_size) ||
>                    (fs_param.s_feature_compat &
>                     EXT3_FEATURE_COMPAT_HAS_JOURNAL)) {
> -               journal_blocks = figure_journal_size(journal_size, fs);
> -
>                 if (super_only) {
>                         printf(_("Skipping journal creation in super-only mode\n"));
>                         fs->super->s_journal_inum = EXT2_JOURNAL_INO;
> --
> 1.7.2.3
>
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