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Date: Wed, 9 Dec 2020 10:34:54 +0800 From: Huang Jianan <huangjianan@...o.com> To: linux-erofs@...ts.ozlabs.org Cc: guoweichao@...o.com, zhangshiming@...o.com, linux-kernel@...r.kernel.org Subject: Re: [PATCH v3] erofs: avoiding using generic_block_bmap 在 2020/12/8 21:11, Huang Jianan 写道: > 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@...o.com> > Signed-off-by: Guo Weichao <guoweichao@...o.com> > --- > fs/erofs/data.c | 30 ++++++++++-------------------- > 1 file changed, 10 insertions(+), 20 deletions(-) > > diff --git a/fs/erofs/data.c b/fs/erofs/data.c > index 347be146884c..399ffd857c50 100644 > --- a/fs/erofs/data.c > +++ b/fs/erofs/data.c > @@ -312,36 +312,26 @@ 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(iblock), Sorry for my mistake, it should be: .m_la = blknr_to_addr(block), > + }; > + sector_t blknr = 0; > > if (EROFS_I(inode)->datalayout == EROFS_INODE_FLAT_INLINE) { > erofs_blk_t blks = i_size_read(inode) >> LOG_BLOCK_SIZE; > > if (block >> LOG_SECTORS_PER_BLOCK >= blks) > - return 0; > + goto out; > } > > - return generic_block_bmap(mapping, block, erofs_get_block); > + if (!erofs_map_blocks(inode, &map, EROFS_GET_BLOCKS_RAW)) > + blknr = erofs_blknr(map.m_pa); > + > +out: > + return blknr; > } > > /* for uncompressed (aligned) files and raw access for other files */
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