Re: [PATCH v8 05/19] block, fs: Restore the per-bio/request data lifetime fields

[Bart Van Assche <bvanassche@acm.org>]

On 1/22/24 01:23, Kanchan Joshi wrote:
> On 12/19/2023 5:37 AM, Bart Van Assche wrote:
> 
>> diff --git a/block/fops.c b/block/fops.c
>> index 0abaac705daf..787ce52bc2c6 100644
>> --- a/block/fops.c
>> +++ b/block/fops.c
>> @@ -73,6 +73,7 @@ static ssize_t __blkdev_direct_IO_simple(struct kiocb *iocb,
>>    		bio_init(&bio, bdev, vecs, nr_pages, dio_bio_write_op(iocb));
>>    	}
>>    	bio.bi_iter.bi_sector = pos >> SECTOR_SHIFT;
>> +	bio.bi_write_hint = file_inode(iocb->ki_filp)->i_write_hint;
>>    	bio.bi_ioprio = iocb->ki_ioprio;
>>    
>>    	ret = bio_iov_iter_get_pages(&bio, iter);
>> @@ -203,6 +204,7 @@ static ssize_t __blkdev_direct_IO(struct kiocb *iocb, struct iov_iter *iter,
>>    
>>    	for (;;) {
>>    		bio->bi_iter.bi_sector = pos >> SECTOR_SHIFT;
>> +		bio->bi_write_hint = file_inode(iocb->ki_filp)->i_write_hint;
>>    		bio->bi_private = dio;
>>    		bio->bi_end_io = blkdev_bio_end_io;
>>    		bio->bi_ioprio = iocb->ki_ioprio;
>> @@ -321,6 +323,7 @@ static ssize_t __blkdev_direct_IO_async(struct kiocb *iocb,
>>    	dio->flags = 0;
>>    	dio->iocb = iocb;
>>    	bio->bi_iter.bi_sector = pos >> SECTOR_SHIFT;
>> +	bio->bi_write_hint = file_inode(iocb->ki_filp)->i_write_hint;
> 
> This (and two more places above) should rather be changed to:
> 
> bio.bi_write_hint = bdev_file_inode(iocb->ki_filp)->i_write_hint;
> 
> Note that at other places too (e.g., blkdev_fallocate, blkdev_mmap,
> blkdev_lseek) bdev inode is used and not file inode.

Why should this code be changed? The above code has been tested and
works fine.

Thanks,

Bart.