Hi Chao,
On 2019/7/16 15:05, Chao Yu wrote:
> Add erofs_bmap() to support FIBMAP ioctl on flatmode inode.
>
> Signed-off-by: Chao Yu <yuchao0@xxxxxxxxxx>
> ---
> drivers/staging/erofs/data.c | 29 +++++++++++++++++++++++++++++
> 1 file changed, 29 insertions(+)
>
> diff --git a/drivers/staging/erofs/data.c b/drivers/staging/erofs/data.c
> index fbce71403d87..03da57f04347 100644
> --- a/drivers/staging/erofs/data.c
> +++ b/drivers/staging/erofs/data.c
> @@ -308,9 +308,38 @@ static int erofs_raw_access_readpages(struct file *filp,
> return iomap_readpages(mapping, pages, nr_pages, &erofs_iomap_ops);
> }
>
> +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;
> +
> + if (is_inode_flat_inline(inode))
> + return 0;
could we support flat_inline as well? some difficulty on this?
(I have no idea return 0 is suitable for us since we have tail-end packing...)
Thanks,
Gao Xiang
> +
> + return generic_block_bmap(mapping, block, erofs_get_block);
> +}
> +
> /* for uncompressed (aligned) files and raw access for other files */
> const struct address_space_operations erofs_raw_access_aops = {
> .readpage = erofs_raw_access_readpage,
> .readpages = erofs_raw_access_readpages,
> + .bmap = erofs_bmap,
> };
>
>
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