Re: [PATCH 05/20] block: Allow bio_iov_iter_get_pages() with bio->bi_bdev unset

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On Tue, Aug 01, 2023 at 03:04:50PM -0400, Kent Overstreet wrote:
> > Because blk-cgroup not only works at the lowest level in the stack,
> > but also for stackable block devices.  It's not a design decision I
> > particularly agree with, but it's been there forever.
> 
> You're setting the association only to the highest block device in the
> stack - how on earth is it supposed to work with anything lower?

Hey, ask the cgroup folks as they come up with it.  I'm not going to
defend the logic here.

> And looking at bio_associate_blkg(), this code looks completely broken.
> It's checking bio->bi_blkg, but that's just been set to NULL in
> bio_init().

It's checking bi_blkg because it can also be called from bio_set_dev.

> And this is your code, so I think you need to go over this again.

It's "my code" in the sene of that I did one big round of unwinding
the even bigger mess that was there.  There is another few rounds needed
for the code to vaguely make sense.



[Index of Archives]     [Linux RAID]     [Linux SCSI]     [Linux ATA RAID]     [IDE]     [Linux Wireless]     [Linux Kernel]     [ATH6KL]     [Linux Bluetooth]     [Linux Netdev]     [Kernel Newbies]     [Security]     [Git]     [Netfilter]     [Bugtraq]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Device Mapper]

  Powered by Linux