Re: [PATCH 01/10] iomap: handle a post-direct I/O invalidate race in iomap_write_delalloc_release

Christoph Hellwig
2024-08-29T03:46:30Z

On Wed, Aug 28, 2024 at 09:13:38AM -0700, Darrick J. Wong wrote:
> Though we might have to revisit this for filesystems that don't take
> i_rwsem exclusively when writing -- is that a problem? I guess if you
> had two threads both writing and punching the pagecache they could get
> into trouble, but that might be a case of "if it hurts don't do that".

No i_rwsem for buffered writes? You can't really do that without hell
breaking lose. At least not without another exclusive lock.