From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail172.messagelabs.com (mail172.messagelabs.com [216.82.254.3]) by kanga.kvack.org (Postfix) with SMTP id C080F6B004F for ; Sun, 12 Jul 2009 04:42:16 -0400 (EDT) Message-ID: <4A59A517.1080605@panasas.com> Date: Sun, 12 Jul 2009 11:55:51 +0300 From: Boaz Harrosh MIME-Version: 1.0 Subject: Re: [rfc][patch 3/4] fs: new truncate sequence References: <20090707144823.GE2714@wotan.suse.de> <20090707145820.GA9976@infradead.org> <20090707150257.GG2714@wotan.suse.de> <20090707150758.GA18075@infradead.org> <20090707154809.GH2714@wotan.suse.de> <20090707163042.GA14947@infradead.org> <20090708063225.GL2714@wotan.suse.de> <20090708104701.GA31419@infradead.org> <20090708123412.GQ2714@wotan.suse.de> <4A54C435.1000503@panasas.com> <20090709075100.GU2714@wotan.suse.de> In-Reply-To: <20090709075100.GU2714@wotan.suse.de> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org To: Nick Piggin Cc: Christoph Hellwig , linux-fsdevel@vger.kernel.org, Jan Kara , LKML , linux-mm@kvack.org List-ID: 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 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org