Re: [PATCHv9 3/6] iomap: Add some uptodate state handling helpers for ifs state bitmap

[Ritesh Harjani (IBM) <ritesh.list@gmail.com>]

Christoph Hellwig <hch@infradead.org> writes:

> On Sat, Jun 10, 2023 at 05:09:04PM +0530, Ritesh Harjani (IBM) wrote:
>> This patch adds two of the helper routines iomap_ifs_is_fully_uptodate()
>> and iomap_ifs_is_block_uptodate() for managing uptodate state of
>> ifs state bitmap.
>>
>> In later patches ifs state bitmap array will also handle dirty state of all
>> blocks of a folio. Hence this patch adds some helper routines for handling
>> uptodate state of the ifs state bitmap.
>>
>> Signed-off-by: Ritesh Harjani (IBM) <ritesh.list@gmail.com>
>> ---
>>  fs/iomap/buffered-io.c | 28 ++++++++++++++++++++--------
>>  1 file changed, 20 insertions(+), 8 deletions(-)
>>
>> diff --git a/fs/iomap/buffered-io.c b/fs/iomap/buffered-io.c
>> index e237f2b786bc..206808f6e818 100644
>> --- a/fs/iomap/buffered-io.c
>> +++ b/fs/iomap/buffered-io.c
>> @@ -43,6 +43,20 @@ static inline struct iomap_folio_state *iomap_get_ifs(struct folio *folio)
>>
>>  static struct bio_set iomap_ioend_bioset;
>>
>> +static inline bool iomap_ifs_is_fully_uptodate(struct folio *folio,
>> +					       struct iomap_folio_state *ifs)
>> +{
>> +	struct inode *inode = folio->mapping->host;
>> +
>> +	return bitmap_full(ifs->state, i_blocks_per_folio(inode, folio));
>> +}
>> +
>> +static inline bool iomap_ifs_is_block_uptodate(struct iomap_folio_state *ifs,
>> +					       unsigned int block)
>> +{
>> +	return test_bit(block, ifs->state);
>> +}

static inline bool iomap_ifs_is_block_dirty(struct folio *folio,
		struct iomap_folio_state *ifs, int block)
{
	struct inode *inode = folio->mapping->host;
	unsigned int blks_per_folio = i_blocks_per_folio(inode, folio);

	return test_bit(block + blks_per_folio, ifs->state);
}

>
> A little nitpicky, but do the _ifs_ name compenents here really add
> value?
>

Maybe if you look at both of above functions together to see the value?

> Otherwise looks good:
>
> Reviewed-by: Christoph Hellwig <hch@lst.de>

Thanks!