convert the SCSI ULDs to the atomic queue limits API v2

[John Garry]

On 31/05/2024 08:47, Christoph Hellwig wrote:
> Hi all,

Just saying that b4 for some reason does not create a .mbox to apply for 
this series when using "b4 am". It also no longer does for v1 (when it 
did previously). I guess that the series versioning confused it.

> 
> this series converts the SCSI upper level drivers to the atomic queue
> limits API.
> 
> The first patch is a bug fix for ubd that later patches depend on and
> might be worth picking up for 6.10.
> 
> The second patch changes the max_sectors calculation to take the optimal
> I/O size into account so that sd, nbd and rbd don't have to mess with
> the user max_sector value.  I'd love to see a careful review from the
> nbd and rbd maintainers for this one!
> 
> The following patches clean up a few lose ends in the sd driver, and
> then convert sd and sr to the atomic queue limits API.  The final
> patches remove the now unused block APIs, and convert a few to be
> specific to their now more narrow use case.
> 
> The patches are against Jens' block-6.10 tree.  Due to the amount of
> block layer changes in here, and other that will depend on it, it
> would be good if this could eventually be merged through the block
> tree, or at least a shared branch between the SCSI and block trees.
> 
> Changes since v1:
>   - change the io_opt value for rbd
>   - fix a left-over direct assignent to q->limits
>   - add a new patch to refactor the ubd interrupt handler
>   - use an else if to micro-optimize the ubd error handling
>   - also remove disk_set_max_open_zones and disk_set_max_active_zones
>   - use SECTOR_SHIFT in one more place
>   - various spelling fixes
>   - comment formating fix
> 
> Diffstat:
>   arch/um/drivers/ubd_kern.c   |   50 +++------
>   block/blk-settings.c         |  238 +------------------------------------------
>   drivers/block/nbd.c          |    2
>   drivers/block/rbd.c          |    3
>   drivers/block/xen-blkfront.c |    4
>   drivers/scsi/sd.c            |  222 ++++++++++++++++++++--------------------
>   drivers/scsi/sd.h            |    6 -
>   drivers/scsi/sd_zbc.c        |   27 ++--
>   drivers/scsi/sr.c            |   42 ++++---
>   include/linux/blkdev.h       |   52 +++------
>   10 files changed, 210 insertions(+), 436 deletions(-)
>