linux-kernel - Re: [PATCH v2 2/2] staging: erofs: fix i

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Message-ID: <20190528065709.GY31203@kadam>
Date:   Tue, 28 May 2019 09:57:09 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Chao Yu <yuchao0@...wei.com>
Cc:     Gao Xiang <gaoxiang25@...wei.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        devel@...verdev.osuosl.org, linux-erofs@...ts.ozlabs.org,
        Chao Yu <chao@...nel.org>, LKML <linux-kernel@...r.kernel.org>,
        weidu.du@...wei.com, Fang Wei <fangwei1@...wei.com>,
        Miao Xie <miaoxie@...wei.com>
Subject: Re: [PATCH v2 2/2] staging: erofs: fix i_blocks calculation

On Tue, May 28, 2019 at 11:02:12AM +0800, Chao Yu wrote:
> On 2019/5/28 10:36, Gao Xiang wrote:
> > For compressed files, i_blocks should not be calculated
> > by using i_size. i_u.compressed_blocks is used instead.
> > 
> > In addition, i_blocks was miscalculated for non-compressed
> > files previously, fix it as well.
> > 
> > Signed-off-by: Gao Xiang <gaoxiang25@...wei.com>
> > ---
> > change log v2:
> >  - fix description in commit message
> >  - fix to 'inode->i_blocks = nblks << LOG_SECTORS_PER_BLOCK'
> > 
> > Thanks,
> > Gao Xiang
> > 
> >  drivers/staging/erofs/inode.c | 14 ++++++++++++--
> >  1 file changed, 12 insertions(+), 2 deletions(-)
> > 
> > diff --git a/drivers/staging/erofs/inode.c b/drivers/staging/erofs/inode.c
> > index 8da144943ed6..6e67e018784e 100644
> > --- a/drivers/staging/erofs/inode.c
> > +++ b/drivers/staging/erofs/inode.c
> > @@ -20,6 +20,7 @@ static int read_inode(struct inode *inode, void *data)
> >  	struct erofs_vnode *vi = EROFS_V(inode);
> >  	struct erofs_inode_v1 *v1 = data;
> >  	const unsigned int advise = le16_to_cpu(v1->i_advise);
> > +	erofs_blk_t nblks = 0;
> >  
> >  	vi->data_mapping_mode = __inode_data_mapping(advise);
> >  
> > @@ -60,6 +61,10 @@ static int read_inode(struct inode *inode, void *data)
> >  			le32_to_cpu(v2->i_ctime_nsec);
> >  
> >  		inode->i_size = le64_to_cpu(v2->i_size);
> > +
> > +		/* total blocks for compressed files */
> > +		if (vi->data_mapping_mode == EROFS_INODE_LAYOUT_COMPRESSION)
> > +			nblks = v2->i_u.compressed_blocks;
> 
> Xiang,
> 
> It needs to use le32_to_cpu(). ;)
> 

I wonder it the kbuild bot is going to send an email about that...
Hopefully these sorts of bugs get detected with Sparse CF=-D__CHECK_ENDIAN__

regards,
dan carpenter