linux-kernel - Re: [RFC v3 01/13] btrfs: add one new mount option '-o hot

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Message-ID: <CAEH94LjZ2pLszJhU_XSNR0=crOBQVHRgv6hHxqVwrYmhesz-PQ@mail.gmail.com>
Date:	Thu, 11 Oct 2012 22:46:46 +0800
From:	Zhi Yong Wu <zwu.kernel@...il.com>
To:	dave@...os.cz, Zhi Yong Wu <zwu.kernel@...il.com>,
	linux-fsdevel@...r.kernel.org, linux-ext4@...r.kernel.org,
	linux-btrfs@...r.kernel.org, linux-kernel@...r.kernel.org,
	linuxram@...ux.vnet.ibm.com, viro@...iv.linux.org.uk,
	david@...morbit.com, tytso@....edu, cmm@...ibm.com,
	Zhi Yong Wu <wuzhy@...ux.vnet.ibm.com>
Subject: Re: [RFC v3 01/13] btrfs: add one new mount option '-o hot_track'

On Thu, Oct 11, 2012 at 10:41 PM, David Sterba <dave@...os.cz> wrote:
> On Thu, Oct 11, 2012 at 10:35:28PM +0800, Zhi Yong Wu wrote:
>> >> --- a/fs/btrfs/super.c
>> >> +++ b/fs/btrfs/super.c
>> >> @@ -303,7 +304,7 @@ enum {
>> >>       Opt_notreelog, Opt_ratio, Opt_flushoncommit, Opt_discard,
>> >>       Opt_space_cache, Opt_clear_cache, Opt_user_subvol_rm_allowed,
>> >>       Opt_enospc_debug, Opt_subvolrootid, Opt_defrag, Opt_inode_cache,
>> >> -     Opt_no_space_cache, Opt_recovery, Opt_skip_balance,
>> >> +     Opt_no_space_cache, Opt_recovery, Opt_skip_balance, Opt_hot_track,
>> >
>> > Please add the new option to the end.
>> To be honest, it can't be added to the end, if you check Opt_err's
>> pattern value, you will find it is NULL, it will cause match_one()
>> return 1. So if we add Opt_hot_track to the end of this array, it will
>> be covered by match_token(), so i prefer to add it to
>> Opt_fatal_errors. Do you think of it?
>
> Ah, sorry, I was not clear what the 'end' means here. The Opt_err is a
> end-of-the-list token, so yes please add hot_track between
> Opt_fatal_errors and Opt_err.
Done, thanks. It will be appreciated if you can make comments on other
patches of this series.:)

>
> david



-- 
Regards,

Zhi Yong Wu
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