linux-kernel - Re: [PATCH 0/9] overlay filesystem: request for inclusion (v17)

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Date:	Wed, 13 Mar 2013 20:10:25 +0100
From:	Sedat Dilek <sedat.dilek@...il.com>
To:	Felix Fietkau <nbd@...nwrt.org>
Cc:	Robin Holt <holt@....com>, Miklos Szeredi <miklos@...redi.hu>,
	viro@...iv.linux.org.uk, torvalds@...ux-foundation.org,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	hch@...radead.org, akpm@...ux-foundation.org, apw@...onical.com,
	neilb@...e.de, jordipujolp@...il.com, ezk@....cs.sunysb.edu,
	dhowells@...hat.com, sedat.dilek@...glemail.com,
	hooanon05@...oo.co.jp, mszeredi@...e.cz
Subject: Re: [PATCH 0/9] overlay filesystem: request for inclusion (v17)

On Wed, Mar 13, 2013 at 7:37 PM, Felix Fietkau <nbd@...nwrt.org> wrote:
> On 2013-03-13 7:12 PM, Robin Holt wrote:
>> On Wed, Mar 13, 2013 at 05:51:33PM +0100, Sedat Dilek wrote:
>>> On Wed, Mar 13, 2013 at 5:21 PM, Miklos Szeredi <miklos@...redi.hu> wrote:
>>> > On Wed, Mar 13, 2013 at 5:10 PM, Sedat Dilek <sedat.dilek@...il.com> wrote:
>>> >
>>> >> Anyway, with CONFIG_OVERLAYFS_FS=m I do not see any related messages
>>> >> when the kernel-module is loaded.
>>> >> So, is this intended?
>>> >> SquashFS prints into the logs, so what is it doing differently?
>>> >
>>> > Some modules do, some don't.  It's not compulsory and not very useful.
>>> >
>>>
>>> What about...
>>>
>>> diff --git a/fs/overlayfs/super.c b/fs/overlayfs/super.c
>>> index 482c26f..92b9ad5 100644
>>> --- a/fs/overlayfs/super.c
>>> +++ b/fs/overlayfs/super.c
>>> @@ -675,11 +675,13 @@ MODULE_ALIAS_FS("overlayfs");
>>>  static int __init ovl_init(void)
>>>  {
>>>         return register_filesystem(&ovl_fs_type);
>>> +       printk(KERN_INFO "overlayfs: loaded\n");
>>
>> How about pr_debug().  That makes things quite for most of us but gives
>> you info when looking for things like boot problems.
> How is having a printk/pr_debug useful here at all? The fact that other
> filesystems do this as well is not a good reason...
> Also, putting it *after* the return statement doesn't make much sense ;)
>

Hehe, I just checked my new kernel... that does not work (nothing in the logs).
But I think it's good to see if the filesystem is registered/loaded.

- Sedat -

> - Felix
>
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