On Wed, Dec 09, 2020 at 10:39:30AM +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 <[email protected]>
> Signed-off-by: Guo Weichao <[email protected]>
> ---
Looks good to me in general, yet see my v3 reply as below:
https://lore.kernel.org/r/[email protected]/
Thanks,
Gao Xiang
> 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..d6ea0a216b57 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(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 */
> --
> 2.25.1
>
