Re: [PATCH v4 0/8] implement async block discards and other ops via io_uring

[Jens Axboe <axboe@kernel.dk>]

On 9/6/24 4:57 PM, Pavel Begunkov wrote:
> There is an interest in having asynchronous block operations like
> discard and write zeroes. The series implements that as io_uring commands,
> which is an io_uring request type allowing to implement custom file
> specific operations.
> 
> First 4 are preparation patches. Patch 5 introduces the main chunk of
> cmd infrastructure and discard commands. Patches 6-8 implement
> write zeroes variants.
> 
> Branch with tests and docs:
> https://github.com/isilence/liburing.git discard-cmd
> 
> The man page specifically (need to shuffle it to some cmd section):
> https://github.com/isilence/liburing/commit/a6fa2bc2400bf7fcb80496e322b5db4c8b3191f0

This looks good to me now. Only minor nit is that I generally don't
like:

while ((bio = blk_alloc_discard_bio(bdev, &sector, &nr_sects, gfp))) {

where assignment and test are in one line as they are harder do read,
prefer doing:

do {
	bio = blk_alloc_discard_bio(bdev, &sector, &nr_sects, gfp);
	if (!bio)
		break;
	[...]
} while (1);

instead. But nothing that should need a respin or anything.

I'll run some testing on this tomorrow!

Thanks,
-- 
Jens Axboe