linux-kernel - Re: [PATCH 30/49] ext4: Convert truncate

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Message-ID: <20080124130018.GA11136@shadowen.org>
Date:	Thu, 24 Jan 2008 13:00:53 +0000
From:	Andy Whitcroft <apw@...dowen.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Theodore Ts'o <tytso@....EDU>, linux-kernel@...r.kernel.org,
	aneesh.kumar@...ux.vnet.ibm.com,
	"linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org>
Subject: Re: [PATCH 30/49] ext4: Convert truncate_mutex to read write semaphore.

On Wed, Jan 23, 2008 at 02:06:59PM -0800, Andrew Morton wrote:
> > On Mon, 21 Jan 2008 22:02:09 -0500 "Theodore Ts'o" <tytso@....EDU> wrote:
> > +int ext4_get_blocks_wrap(handle_t *handle, struct inode *inode, sector_t block,
> > +			unsigned long max_blocks, struct buffer_head *bh,
> > +			int create, int extend_disksize)
> > +{
> > +	int retval;
> > +	if (create) {
> > +		down_write((&EXT4_I(inode)->i_data_sem));
> > +	} else {
> > +		down_read((&EXT4_I(inode)->i_data_sem));
> > +	}
> > +	if (EXT4_I(inode)->i_flags & EXT4_EXTENTS_FL) {
> > +		retval =  ext4_ext_get_blocks(handle, inode, block, max_blocks,
> > +				bh, create, extend_disksize);
> > +	} else {
> > +		retval = ext4_get_blocks_handle(handle, inode, block,
> > +				max_blocks, bh, create, extend_disksize);
> > +	}
> > +	if (create) {
> > +		up_write((&EXT4_I(inode)->i_data_sem));
> > +	} else {
> > +		up_read((&EXT4_I(inode)->i_data_sem));
> > +	}
> 
> This function has many unneeded braces.  checkpatch used to detect this
> but it seems to have broken.

This is a side effect of this rule:
	
	This does not apply if one branch of a conditional statement
	is a single statement. Use braces in both branches.

Basically each arm is being considered in isolation, each arm is seen as
having a "sibling" arm with braces so it is permitted to have braces.
Bugger.

I guess I'll try and see if I can detect this.

> > +	return retval;
> > +}
> >  static int ext4_get_block(struct inode *inode, sector_t iblock,
> >  			struct buffer_head *bh_result, int create)
> 
> Mising newline.

We could check for those ... will look to add in the next release.

-apw
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