linux-kernel - Re: [PATCH 1/3] VFS: apply coding standards to fs/ioctl.c

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Message-Id: <200710281805.l9SI5GoF015442@agora.fsl.cs.sunysb.edu>
Date:	Sun, 28 Oct 2007 14:05:16 -0400
From:	Erez Zadok <ezk@...sunysb.edu>
To:	Christoph Hellwig <hch@...radead.org>
Cc:	Erez Zadok <ezk@...sunysb.edu>, viro@....linux.org.uk,
	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH 1/3] VFS: apply coding standards to fs/ioctl.c 

In message <20071028141222.GA29323@...radead.org>, Christoph Hellwig writes:
> Nice, I always hated these double-indented switch statements.
> 
> > +	case FIBMAP:
> > +	{
> > +		struct address_space *mapping = filp->f_mapping;
> > +		int res;
> > +		/* do we support this mess? */
> > +		if (!mapping->a_ops->bmap)
> > +			return -EINVAL;
> > +		if (!capable(CAP_SYS_RAWIO))
> > +			return -EPERM;
> > +		error = get_user(block, p);
> > +		if (error)
> > +			return error;
> > +		lock_kernel();
> > +		res = mapping->a_ops->bmap(mapping, block);
> > +		unlock_kernel();
> > +		return put_user(res, p);
> 
> While you're at it, it's probably worth splitting this out into
> a small helper function.

Sure.  I assume you mean an internal function to encapsulate the entire case
statement's code, one for each of the FIO* cases.

Erez.
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