Re: [PATCH] ext4: Avoid entering writeback paths during fastcommit replay

On Tue, Aug 04, 2026 at 12:41:13PM -0500, Jan Kara wrote:
> Fastcommit replay effectively happens in nojournal mode. This results in
> ext4_mark_iloc_dirty() setting I_METADATA_WRITEBACK flag and as a result
> we end up entering filesystem writeback functions. However during
> fastcommit replay s_writepages_rwsem isn't initialized yet and hence we
> crash.
> 
> Fix the problem by avoiding setting I_METADATA_WRITEBACK during
> fastcommit replay. Journal replay flushes the whole block device after
> replay anyway so all metadata is properly persisted and replay is faster

It looks like this patch is only applicable if the patch series "fs:
Fix missed inode write during fsync" is applied, and in fact appears
to fix a problem introduced in "[PATCH v5 17/20] ext4: Fix data
integrity writeout issues in nojournal mode"?

						- Ted