Re: don't use ->bd_inode to access the block device size

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On 10/14/21 4:32AM, Anton Altaparmakov wrote:
Hi Christoph,

On 14 Oct 2021, at 07:28, Christoph Hellwig <hch@xxxxxx> wrote:

On Wed, Oct 13, 2021 at 07:10:13AM +0200, Christoph Hellwig wrote:
I wondered about adding a helper for looking at the size in byte units
to avoid the SECTOR_SHIFT shifts in various places.  But given that
I could not come up with a good name and block devices fundamentally
work in sector size granularity I decided against that.

So it seems like the biggest review feedback is that we should have
such a helper.  I think the bdev_size name is the worst as size does
not imply a particular unit.  bdev_nr_bytes is a little better but I'm
not too happy.  Any other suggestions or strong opinions?

bdev_byte_size() would seem to address your concerns?

bdev_nr_bytes() would work though - it is analogous to bdev_nr_sectors() after all.

No strong opinion here but I do agree with you that bdev_size() is a bad choice for sure.  It is bound to cause bugs down the line when people forget what unit it is in.

I don't really mind bdev_size since it's analogous to i_size, but bdev_nr_bytes seems good to me.


Best regards,


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