Aneesh Kumar K.V wrote:

> @@ -1279,6 +1280,9 @@ clear_qf_name:
>               case Opt_delalloc:
>                       set_opt (sbi->s_mount_opt, DELALLOC);
>                       break;

If delalloc, mballoc, extents are the new defaults, is there a reason to
keep them as options?  When would you need to specify -o extents, now,
for example?  (though my brain is fuzzy today, maybe I'm missing
something)  If this were not a filesystem ending in "dev" I could see
keeping it for compatibility with existing fstabs....

> +             case Opt_nodelalloc:
> +                     clear_opt (sbi->s_mount_opt, DELALLOC);
> +                     break;
>               case Opt_mballoc:
>                       set_opt(sbi->s_mount_opt, MBALLOC);
>                       break;
> @@ -1824,6 +1828,8 @@ static int ext4_fill_super (struct super_block *sb, 
> void *data, int silent)
>        * User -o noextents to turn it off
>        */

I'd either update this comment ^^^^ or remove it, I think.

>       set_opt(sbi->s_mount_opt, EXTENTS);
> +     set_opt(sbi->s_mount_opt, DELALLOC);
> +     set_opt(sbi->s_mount_opt, MBALLOC);
>  
>       if (!parse_options ((char *) data, sb, &journal_inum, &journal_devnum,
>                           NULL, 0))

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