linux-kernel - Re: [PATCH] code cleanup on fs/super.c

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Date:	Fri, 18 Feb 2011 03:08:47 +0000
From:	Al Viro <viro@...IV.linux.org.uk>
To:	Steven Liu <lingjiujianke@...il.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	randy.dunlap@...cle.com, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org, dchinner@...hat.com,
	liuqi <liuqi@...nderst.com>
Subject: Re: [PATCH] code cleanup on fs/super.c

On Fri, Feb 18, 2011 at 10:45:12AM +0800, Steven Liu wrote:
> Hi  AI Viro,
> 
>      I have saw this message, :)
> 
>      I think the nfs is using fs_type->get_sb, but it isn't using
> get_sb_bdev(or get_sb_nodev) .
>      So if the nfs cannot let
>      struct dentry *(*mount) (struct file_system_type *, int,
>                const char *, void *);
>      to replace
> 
>      int (*get_sb) (struct file_system_type *, int,
>                const char *, void *, struct vfsmount *);
>      Now, this patch cannot influence nfs normal use.
>      Because get_sb is not must use get_sb_bdev or get_sb_nodev to get mnt,
>      All the filesystem are using mount_bdev mount_nodev now, but it
> isn't called
>      by get_sb,is called by *mount. Do you agreed with me?

Sigh...  Yes, and it is irrelevant.  There's simply no reason to remove
that stuff before the next merge window, when ->get_sb() is going to go
away _anyway_, along with those helpers.  I am not saying that it can't
be done right now; there's simply no point in doing so.  I don't particulary
care about hurting out-of-tree filesystems and if we had ->mnt_devname
series in this window I'd cheerfully ripped ->get_sb() out and let them
deal with it.  However, I don't see any reasons for removing the helpers
in this cycle.  What for?  To force the (trivial) switch to ->mount() in
out-of-tree block filesystems one cycle earlier?
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