Re: [PATCH v5] erofs: avoid using generic_block_bmap

[Huang Jianan]

Thanks for reminding me, I will pay attention about this next time.

在 2020/12/10 10:36, Gao Xiang 写道:
> Hi Jianan,
>
> On Wed, Dec 09, 2020 at 07:57:40PM +0800, Huang Jianan wrote:
> > iblock indicates the number of i_blkbits-sized blocks rather than
> > sectors.
> >
> > In addition, considering buffer_head limits mapped size to 32-bits,
> > should avoid using generic_block_bmap.
> >
> > Fixes: 9da681e017a3 ("staging: erofs: support bmap")
> > Signed-off-by: Huang Jianan <huangjianan@xxxxxxxx>
> > Signed-off-by: Guo Weichao <guoweichao@xxxxxxxx>
> Reviewed-by: Gao Xiang <hsiangkao@xxxxxxxxxx>
>
> Also, I think Chao has sent his Reviewed-by in the previous reply ---
> so unless some major modification happens, it needs to be attached with
> all new versions as a common practice...
>
> I will apply it later to for-next, thanks for your patch!
>
> Thanks,
> Gao Xiang
>
> > ---
> >   fs/erofs/data.c | 26 +++++++-------------------
> >   1 file changed, 7 insertions(+), 19 deletions(-)
> >
> > diff --git a/fs/erofs/data.c b/fs/erofs/data.c
> > index 347be146884c..ea4f693bee22 100644
> > --- a/fs/erofs/data.c
> > +++ b/fs/erofs/data.c
> > @@ -312,27 +312,12 @@ static void erofs_raw_access_readahead(struct readahead_control *rac)
> >   		submit_bio(bio);
> >   }
> >   
> > -static int erofs_get_block(struct inode *inode, sector_t iblock,
> > -			   struct buffer_head *bh, int create)
> > -{
> > -	struct erofs_map_blocks map = {
> > -		.m_la = iblock << 9,
> > -	};
> > -	int err;
> > -
> > -	err = erofs_map_blocks(inode, &map, EROFS_GET_BLOCKS_RAW);
> > -	if (err)
> > -		return err;
> > -
> > -	if (map.m_flags & EROFS_MAP_MAPPED)
> > -		bh->b_blocknr = erofs_blknr(map.m_pa);
> > -
> > -	return err;
> > -}
> > -
> >   static sector_t erofs_bmap(struct address_space *mapping, sector_t block)
> >   {
> >   	struct inode *inode = mapping->host;
> > +	struct erofs_map_blocks map = {
> > +		.m_la = blknr_to_addr(block),
> > +	};
> >   
> >   	if (EROFS_I(inode)->datalayout == EROFS_INODE_FLAT_INLINE) {
> >   		erofs_blk_t blks = i_size_read(inode) >> LOG_BLOCK_SIZE;
> > @@ -341,7 +326,10 @@ static sector_t erofs_bmap(struct address_space *mapping, sector_t block)
> >   			return 0;
> >   	}
> >   
> > -	return generic_block_bmap(mapping, block, erofs_get_block);
> > +	if (!erofs_map_blocks(inode, &map, EROFS_GET_BLOCKS_RAW))
> > +		return erofs_blknr(map.m_pa);
> > +
> > +	return 0;
> >   }
> >   
> >   /* for uncompressed (aligned) files and raw access for other files */
> > --
> > 2.25.1