[PATCH 08/11] fs: add support for non-blocking timestamp updates

[Jeff Layton]

On Tue, 2026-01-06 at 08:50 +0100, Christoph Hellwig wrote:
> Currently file_update_time_flags unconditionally returns -EAGAIN if any
> timestamp needs to be updated and IOCB_NOWAIT is passed.  This makes
> non-blocking direct writes impossible on file systems with granular
> enough timestamps.
> 
> Pass IOCB_NOWAIT to ->update_time and return -EAGAIN if it could block.
> 
> Signed-off-by: Christoph Hellwig <hch at lst.de>
> ---
>  fs/btrfs/inode.c     |  2 ++
>  fs/gfs2/inode.c      |  3 +++
>  fs/inode.c           | 45 +++++++++++++++++++++++++++++++++-----------
>  fs/orangefs/inode.c  |  3 +++
>  fs/overlayfs/inode.c |  2 ++
>  fs/ubifs/file.c      |  3 +++
>  fs/xfs/xfs_iops.c    |  3 +++
>  7 files changed, 50 insertions(+), 11 deletions(-)
> 

LGTM:

Reviewed-by: Jeff Layton <jlayton at kernel.org>