linux-ext4 - Re: [PATCH] e2p: fix getflags for link file

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Message-ID: <20171205161010.2q2owkepbk6zg2hp@thunk.org>
Date:   Tue, 5 Dec 2017 11:10:10 -0500
From:   Theodore Ts'o <tytso@....edu>
To:     Wang Shilong <wangshilong1991@...il.com>
Cc:     linux-ext4@...r.kernel.org, sihara@....com
Subject: Re: [PATCH] e2p: fix getflags for link file

On Mon, Dec 04, 2017 at 10:56:35PM +0900, Wang Shilong wrote:
> From: Wang Shilong <wshilong@....com>
> 
> Steps to reproduce:
> 
> $ touch a
> $ lsattr -dp a
>  2000 ----------------P a
> $ ln -s a b
> $ lsattr -dp b
> lsattr: Operation not supported While reading flags on b
> 
> Link files should be supported, fix it.
> 
> Signed-off-by: Wang Shilong <wshilong@....com>

You can't actually set or get the extended attributes for a symlink;
the *kernel* doesn't support what you seem to be hoping to achieve.
This patch result in fgetflags() following the symlink and opening
whatever file it points at.

	      	      	  	  	   	- Ted