linux-kernel - Re: [rfc][patch 3/4] fs: new truncate sequence

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Date:	Sun, 12 Jul 2009 11:55:51 +0300
From:	Boaz Harrosh <bharrosh@...asas.com>
To:	Nick Piggin <npiggin@...e.de>
CC:	Christoph Hellwig <hch@...radead.org>,
	linux-fsdevel@...r.kernel.org, Jan Kara <jack@...e.cz>,
	LKML <linux-kernel@...r.kernel.org>, linux-mm@...ck.org
Subject: Re: [rfc][patch 3/4] fs: new truncate sequence

On 07/09/2009 10:51 AM, Nick Piggin wrote:
> On Wed, Jul 08, 2009 at 07:07:17PM +0300, Boaz Harrosh wrote:
>> On 07/08/2009 03:34 PM, Nick Piggin wrote:
>>> On Wed, Jul 08, 2009 at 06:47:01AM -0400, Christoph Hellwig wrote:
>>> Index: linux-2.6/fs/attr.c
>>> ===================================================================
>>> --- linux-2.6.orig/fs/attr.c
>>> +++ linux-2.6/fs/attr.c
>>> @@ -112,7 +112,12 @@ int inode_setattr(struct inode * inode,
>>>  
>>>  	if (ia_valid & ATTR_SIZE &&
>>>  	    attr->ia_size != i_size_read(inode)) {
>>> -		int error = vmtruncate(inode, attr->ia_size);
>>> +		int error;
>>> +
>>> +		if (inode->i_op->new_truncate)
>>> +			error = simple_setsize(inode, attr->ia_size);
>> I don't understand this branch.
>> If a filesystem has been converted to set "i_op->new_truncate=true"
>> then it must have been converted to intersect ->setattr and has set
>> the i_size (And needs to clear ATTR_SIZE, why?)
>>
>> All other cases of systems not converted, or systems that do not have
>> ->truncate will fall to the "else" part.
>>
>> before the removal of i_op->new_truncate you will need to do something
>> with the systems that do not have ->truncate which will be a 
>> .setattr = simple_setattr or something
>>
>> So I don't understand this conditional
> 
> inode_setattr *is* our "simple_setattr".
> 

I wish you would split it.

one - helper to be called by converted file systems
      (Which just ignores the ATTR_SIZE)
second - to be set into .setattr which does the simple_setsize + above.

More clear for FS users like me (and that ugly unmask of ATTR_SIZE)

or it's just me?

Thanks
Boaz
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