linux-kernel - Re: [GIT PULL] overlayfs update for 4.9

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Message-ID: <20161005234928.GJ19539@ZenIV.linux.org.uk>
Date:   Thu, 6 Oct 2016 00:49:28 +0100
From:   Al Viro <viro@...IV.linux.org.uk>
To:     Miklos Szeredi <miklos@...redi.hu>
Cc:     linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-unionfs@...r.kernel.org
Subject: Re: [GIT PULL] overlayfs update for 4.9

On Wed, Oct 05, 2016 at 09:52:10PM +0200, Miklos Szeredi wrote:
> Hi Al,
> 
> Please pull from:
> 
>   git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/vfs.git overlayfs-viro
> 
> This has an assortment of fixes and cleanups for overlayfs.
> 
> It also touches the VFS:
> 
>  - add the vfs_get_link() helper for calling i_op->get_link();
>  - fix mnt_want_write_file() to freeze protect the underlying sb instead of
>    overlay sb;
>  - allow vfs_clone_file_range() to be called by overlayfs.

Could you explain why e.g. fsetxattr() needs a different treatment in
"vfs: mnt_want_write_file() should freeze protect underlying sb"?