[PATCH v2 0/5] fs: refactor write_begin/write_end and add ext4 IOCB_DONTCACHE support

[Matthew Wilcox]

On Tue, Jun 24, 2025 at 12:11:59PM +0000, 陈涛涛 Taotao Chen wrote:
> From: Taotao Chen <chentaotao at didiglobal.com>
> 
> This patch series refactors the address_space_operations write_begin()
> and write_end() callbacks to take struct kiocb * as their first argument,
> allowing IOCB flags such as IOCB_DONTCACHE to propagate to filesystem’s
> buffered write path.
> 
> Ext4 is updated to implement handling of the IOCB_DONTCACHE flag in its
> buffered write path and to advertise support via the FOP_DONTCACHE file
> operation flag.
> 
> Additionally, the i915 driver’s shmem write paths are updated to bypass
> the legacy write_begin/write_end interface in favor of directly calling
> write_iter(), using a constructed synchronous kiocb. Another i915 patch
> replaces a manual write loop with kernel_write() in shmem object creation.

Thanks, this is a really good cleanup.