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From: Gao Xiang <hsiangkao@linux.alibaba.com>
To: Chao Yu <chao@kernel.org>
Cc: Tao Ma <boyu.mt@taobao.com>, LKML <linux-kernel@vger.kernel.org>,
	Peng Tao <tao.peng@linux.alibaba.com>,
	Joseph Qi <joseph.qi@linux.alibaba.com>,
	Liu Bo <bo.liu@linux.alibaba.com>,
	Eryu Guan <eguan@linux.alibaba.com>,
	Liu Jiang <gerry@linux.alibaba.com>,
	linux-erofs@lists.ozlabs.org
Subject: Re: [PATCH v2 2/2] erofs: support reading chunk-based uncompressed files
Date: Fri, 20 Aug 2021 17:33:21 +0800	[thread overview]
Message-ID: <YR924TIIgLzJx0Ok@B-P7TQMD6M-0146.local> (raw)
In-Reply-To: <f501144f-f7fc-1150-0c41-4c1981bd0594@kernel.org>

On Fri, Aug 20, 2021 at 05:29:36PM +0800, Chao Yu wrote:
> On 2021/8/20 17:12, Gao Xiang wrote:
> > Hi Chao,
> > 
> > On Fri, Aug 20, 2021 at 05:04:13PM +0800, Chao Yu wrote:
> > > On 2021/8/19 14:33, Gao Xiang wrote:
> > 
> > ...
> > 
> > > >    }
> > > > +static int erofs_map_blocks(struct inode *inode,
> > > > +			    struct erofs_map_blocks *map, int flags)
> > > > +{
> > > > +	struct super_block *sb = inode->i_sb;
> > > > +	struct erofs_inode *vi = EROFS_I(inode);
> > > > +	struct erofs_inode_chunk_index *idx;
> > > > +	struct page *page;
> > > > +	u64 chunknr;
> > > > +	unsigned int unit;
> > > > +	erofs_off_t pos;
> > > > +	int err = 0;
> > > > +
> > > > +	if (map->m_la >= inode->i_size) {
> > > > +		/* leave out-of-bound access unmapped */
> > > > +		map->m_flags = 0;
> > > > +		map->m_plen = 0;
> > > > +		goto out;
> > > > +	}
> > > > +
> > > > +	if (vi->datalayout != EROFS_INODE_CHUNK_BASED)
> > > > +		return erofs_map_blocks_flatmode(inode, map, flags);
> > > > +
> > > > +	if (vi->chunkformat & EROFS_CHUNK_FORMAT_INDEXES)
> > > > +		unit = sizeof(*idx);	/* chunk index */
> > > > +	else
> > > > +		unit = 4;		/* block map */
> > > 
> > > You mean sizeof(__le32)?
> > 
> > Yeah, sizeof(__le32) == 4, either way works for me.
> > 
> > If some tendency about this, I will update when applying.
> 
> Xiang,
> 
> Yeah, I preper:
> 
> #define EROFS_BLOCK_MAP_ENTRY_SIZE	sizeof(__le32)
> 
> 	unit = EROFS_BLOCK_MAP_ENTRY_SIZE;
> 
> to improve readablity, but unit = sizeof(__le32) is fine as well.

Ok, looks much better, let me revise v3 here.

Thanks,
Gao Xiang

> 
> Thanks,
> 
> > 
> > > 
> > > Otherwise it looks good to me.
> > > 
> > > Reviewed-by: Chao Yu <chao@kernel.org>
> > > 
> > 
> > Thanks for the review!
> > 
> > Thanks,
> > Gao Xiang
> > 
> > > Thanks,
> > > 

  reply	other threads:[~2021-08-20  9:33 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-18  7:07 [PATCH 1/2] erofs: introduce chunk-based file on-disk format Gao Xiang
2021-08-18  7:07 ` [PATCH 2/2] erofs: support reading chunk-based uncompressed files Gao Xiang
2021-08-18 22:29   ` Liu Bo
2021-08-19  3:46   ` Chao Yu
2021-08-19  5:14     ` Gao Xiang
2021-08-18 22:28 ` [PATCH 1/2] erofs: introduce chunk-based file on-disk format Liu Bo
2021-08-19  0:59   ` Gao Xiang
2021-08-19  3:32 ` Chao Yu
2021-08-19  6:33 ` [PATCH v2 " Gao Xiang
2021-08-19  6:33   ` [PATCH v2 2/2] erofs: support reading chunk-based uncompressed files Gao Xiang
2021-08-19  6:37     ` Joseph Qi
2021-08-19  7:12       ` Gao Xiang
2021-08-20  9:04     ` Chao Yu
2021-08-20  9:12       ` Gao Xiang
2021-08-20  9:29         ` Chao Yu
2021-08-20  9:33           ` Gao Xiang [this message]
2021-08-20 10:00   ` [PATCH v3 1/2] erofs: introduce chunk-based file on-disk format Gao Xiang
2021-08-20 10:00     ` [PATCH v3 2/2] erofs: support reading chunk-based uncompressed files Gao Xiang

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