linux-kernel - Re: [PATCH 6/6] ext4: tighten restrictions on inode flags

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Message-Id: <1213298827.6382.2.camel@norville.austin.ibm.com>
Date:	Thu, 12 Jun 2008 14:27:07 -0500
From:	Dave Kleikamp <shaggy@...ux.vnet.ibm.com>
To:	Duane Griffin <duaneg@...da.com>
Cc:	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
	akpm@...ux-foundation.org, Andreas Dilger <adilger@....com>,
	linux-ext4@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 6/6] ext4: tighten restrictions on inode flags


On Wed, 2008-06-11 at 12:49 +0100, Duane Griffin wrote:
> 2008/6/11 Aneesh Kumar K.V <aneesh.kumar@...ux.vnet.ibm.com>:
> >> +/* Mask out flags that are inappropriate for the given type of inode. */
> >> +static inline __le32 ext4_mask_flags(__le16 mode, __le32 flags)
> >> +{
> >> +     if (S_ISDIR(mode))
> >> +             return flags;
> >> +     else if (S_ISREG(mode))
> >> +             return flags & ~EXT4_REG_FLMASK;
> >> +     else
> >> +             return flags & ~EXT4_OTHER_FLMASK;
> >> +}
> >> +
> >
> > why are the arguments __le32 ? They should be in host order.
> >
> > static inline  __u32 ext4_mask_flags(umode_t mode, __u32 flags)
> 
> Whoops, I was matching the fields in ex4_inode, but I should have been
> looking at ext4_inode_info. Shouldn't sparse have complained about
> that?

It does, but not by default.  You need to run sparse with
-D__CHECK_ENDIAN__

I use this alias:
make_sparse is aliased to `make C=2 CF="-D__CHECK_ENDIAN__"'

Shaggy
-- 
David Kleikamp
IBM Linux Technology Center

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