On Mon 15-08-16 13:09:13, Ross Zwisler wrote:
> When DAX calls _ext4_get_block() and the file offset points to a hole we
> currently don't set bh->b_size. When we re-enable PMD faults DAX will
> need bh->b_size to tell it the size of the hole so it can decide whether to
> fault in a 4 KiB zero page or a 2 MiB zero page.
>
> _ext4_get_block() has the hole size information from ext4_map_blocks(), so
> populate bh->b_size.
>
> Signed-off-by: Ross Zwisler <ross.zwisler@xxxxxxxxxxxxxxx>
Looks good. You can add:
Reviewed-by: Jan Kara <jack@xxxxxxx>
Honza
> ---
> fs/ext4/inode.c | 3 +++
> 1 file changed, 3 insertions(+)
>
> diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
> index 3131747..1808013 100644
> --- a/fs/ext4/inode.c
> +++ b/fs/ext4/inode.c
> @@ -759,6 +759,9 @@ static int _ext4_get_block(struct inode *inode, sector_t iblock,
> ext4_update_bh_state(bh, map.m_flags);
> bh->b_size = inode->i_sb->s_blocksize * map.m_len;
> ret = 0;
> + } else if (ret == 0) {
> + /* hole case, need to fill in bh->b_size */
> + bh->b_size = inode->i_sb->s_blocksize * map.m_len;
> }
> return ret;
> }
> --
> 2.9.0
>
>
--
Jan Kara <jack@xxxxxxxx>
SUSE Labs, CR
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