Re: (subset) support file system generated / verified integrity information v4

On Mon, Mar 09, 2026 at 08:52:23AM -0600, Jens Axboe wrote:
> 
> On Mon, 23 Feb 2026 05:20:00 -0800, Christoph Hellwig wrote:
> > this series adds support to generate and verify integrity information
> > (aka T10 PI) in the file system, instead of the automatic below the
> > covers support that is currently used.
> > 
> > There two reasons for this:
> > 
> >   a) to increase the protection enveloped.  Right now this is just a
> >      minor step from the bottom of the block layer to the file system,
> >      but it is required to support io_uring integrity data passthrough in
> >      the file system similar to the currently existing support for block
> >      devices, which will follow next.  It also allows the file system to
> >      directly see the integrity error and act upon in, e.g. when using
> >      RAID either integrated (as in btrfs) or by supporting reading
> >      redundant copies through the block layer.
> >   b) to make the PI processing more efficient.  This is primarily a
> >      concern for reads, where the block layer auto PI has to schedule a
> >      work item for each bio, and the file system them has to do it again
> >      for bounce buffering.  Additionally the current iomap post-I/O
> >      workqueue handling is a lot more efficient by supporting merging and
> >      avoiding workqueue scheduling storms.
> > 
> > [...]
> 
> Applied, thanks!
> 
> [01/16] block: factor out a bio_integrity_action helper
>         commit: 7ea25eaad5ae3a6c837a3df9bdb822194f002565
> [02/16] block: factor out a bio_integrity_setup_default helper
>         commit: a936655697cd8d1bab2fd5189e2c33dd6356a266
> [03/16] block: add a bdev_has_integrity_csum helper
>         commit: 7afe93946dff63aa57c6db81f5eb43ac8233364e
> [04/16] block: prepare generation / verification helpers for fs usage
>         commit: 3f00626832a9f85fc5a04b25898157a6d43cb236
> [05/16] block: make max_integrity_io_size public
>         commit: 8c56ef10150ed7650cf4105539242c94c156148c
> [06/16] block: add fs_bio_integrity helpers
>         commit: 0bde8a12b5540572a7fd6d2867bee6de15e4f289
> [07/16] block: pass a maxlen argument to bio_iov_iter_bounce
>         commit: a9aa6045abde87b94168c3ba034b953417e27272

I've pulled the shared branch and also updated my base to v7.0-rc3 as
per Christoph's request in the other mail.