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

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

Best regards,
-- 
Jens Axboe