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

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Date:	Wed, 13 Mar 2013 19:37:50 +0100
From:	Felix Fietkau <nbd@...nwrt.org>
To:	Robin Holt <holt@....com>
CC:	Sedat Dilek <sedat.dilek@...il.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 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 ;)

- Felix

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