linux-ext4 - Re: [PATCH 2/2] ext4: update the s_overhead_clusters in the backup sb's when resizing

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Message-Id: <68DC6315-7940-48F8-99D9-D26599819EE3@dilger.ca>
Date:   Mon, 4 Jul 2022 14:50:47 -0600
From:   Andreas Dilger <adilger@...ger.ca>
To:     Theodore Ts'o <tytso@....edu>
Cc:     Ext4 Developers List <linux-ext4@...r.kernel.org>
Subject: Re: [PATCH 2/2] ext4: update the s_overhead_clusters in the backup
 sb's when resizing

On Jun 28, 2022, at 10:00 PM, Theodore Ts'o <tytso@....edu> wrote:
> 
> When the EXT4_IOC_RESIZE_FS ioctl is complete, update the backup
> superblocks.  We don't do this for the old-style resize ioctls since
> they are quite ancient, and only used by very old versions of
> resize2fs --- and we don't want to update the backup superblocks every
> time EXT4_IOC_GROUP_ADD is called, since it might get called a lot.
> 
> Signed-off-by: Theodore Ts'o <tytso@....edu>

One minor style nit below, but you can take it or leave it...

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

> diff --git a/fs/ext4/resize.c b/fs/ext4/resize.c
> index e5c2713aa11a..8abff9400f69 100644
> --- a/fs/ext4/resize.c
> +++ b/fs/ext4/resize.c
> @@ -97,10 +97,14 @@ int ext4_resize_begin(struct super_block *sb)
> 	return ret;
> }
> 
> -void ext4_resize_end(struct super_block *sb)
> +int ext4_resize_end(struct super_block *sb, bool update_backups)
> {
> 	clear_bit_unlock(EXT4_FLAGS_RESIZING, &EXT4_SB(sb)->s_ext4_flags);
> 	smp_mb__after_atomic();
> +	if (update_backups)
> +		return ext4_update_overhead(sb, true);
> +	else
> +		return 0;

(style) no need for "else" after return.

Cheers, Andreas






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