Re: [PATCH v2] fs/buffer: serialize set_buffer_uptodate against concurrent clears

[Matthew Wilcox]

On Thu, Jul 30, 2026 at 06:09:24PM -0400, Chris S wrote:
> Yes, that works. And appreciate your reply.
>   I prototyped it, and it survives a journal replay.
> 
> Six sites, with bio_add_virt_nofail() covering the submit side:
> 
>   bh_offset()                     b_page may be NULL
>   buffer_set_crypto_ctx()         NULL guard
>   __bh_submit()                   bio_add_virt_nofail() when !b_folio, and
>                                   skip wbc_account_cgroup_owner()
>   jbd2_journal_write_metadata_buffer()
>                                   b_folio = NULL, b_data =
>                                   jh->b_frozen_data, not folio_set_bh()
>   jbd2_checksum_data(), jbd2_block_tag_csum_set()   both kmap the temp bh
>                                   (fs/jbd2/commit.c:705 and :745)
> 
> 4 files, +38/-12.  I'll send it as the first patch of the series.

Fantastic.  Would you care to also include this patch as part of your
series?