linux-kernel - Re: [PATCH 09/14] fs: factor out a mark_inode_dirty

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Message-ID: <fbym7i2zelbatxbhy5eeffwpa3ni7bstjddbf7ran7djzthwjo@kfxj3wrxeuou>
Date: Mon, 24 Nov 2025 14:22:59 +0100
From: Jan Kara <jack@...e.cz>
To: Christoph Hellwig <hch@....de>
Cc: Christian Brauner <brauner@...nel.org>, 
	Al Viro <viro@...iv.linux.org.uk>, David Sterba <dsterba@...e.com>, Jan Kara <jack@...e.cz>, 
	Mike Marshall <hubcap@...ibond.com>, Martin Brandenburg <martin@...ibond.com>, 
	Carlos Maiolino <cem@...nel.org>, Stefan Roesch <shr@...com>, Jeff Layton <jlayton@...nel.org>, 
	linux-kernel@...r.kernel.org, linux-btrfs@...r.kernel.org, gfs2@...ts.linux.dev, 
	io-uring@...r.kernel.org, devel@...ts.orangefs.org, linux-unionfs@...r.kernel.org, 
	linux-mtd@...ts.infradead.org, linux-xfs@...r.kernel.org, linux-nfs@...r.kernel.org
Subject: Re: [PATCH 09/14] fs: factor out a mark_inode_dirty_time helper

On Fri 14-11-25 07:26:12, Christoph Hellwig wrote:
> Factor out the inode dirtying vs lazytime logic from generic_update_time
> into a new helper so that it can be reused in file system methods.
> 
> Signed-off-by: Christoph Hellwig <hch@....de>
> ---
>  fs/fs-writeback.c  | 15 +++++++++++++++
>  fs/inode.c         | 14 +++-----------
>  include/linux/fs.h |  3 ++-
>  3 files changed, 20 insertions(+), 12 deletions(-)
> 
> diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c
> index 2b35e80037fe..930697f39153 100644
> --- a/fs/fs-writeback.c
> +++ b/fs/fs-writeback.c
> @@ -2671,6 +2671,21 @@ void __mark_inode_dirty(struct inode *inode, int flags)
>  }
>  EXPORT_SYMBOL(__mark_inode_dirty);
>  
> +void mark_inode_dirty_time(struct inode *inode, unsigned int flags)

What I find a bit concerning here is that mark_inode_dirty_time() takes a
different kind of flags than __mark_inode_dirty() so it's relatively easy
to confuse. Proper typing of 'flags' would be nice here but it's a bit
cumbersome to do in C so I'm not sure if it's worth it for this relatively
limited use. So I guess feel free to add:

Reviewed-by: Jan Kara <jack@...e.cz>

								Honza

> +{
> +	if (inode->i_sb->s_flags & SB_LAZYTIME) {
> +		int dirty_flags = 0;
> +
> +		if (flags & (S_ATIME | S_MTIME | S_CTIME))
> +			dirty_flags = I_DIRTY_TIME;
> +		if (flags & S_VERSION)
> +			dirty_flags |= I_DIRTY_SYNC;
> +		__mark_inode_dirty(inode, dirty_flags);
> +	} else {
> +		mark_inode_dirty_sync(inode);
> +	}
> +}
> +
>  /*
>   * The @s_sync_lock is used to serialise concurrent sync operations
>   * to avoid lock contention problems with concurrent wait_sb_inodes() calls.
> diff --git a/fs/inode.c b/fs/inode.c
> index 57c458ee548d..559ce5c07188 100644
> --- a/fs/inode.c
> +++ b/fs/inode.c
> @@ -2095,17 +2095,9 @@ EXPORT_SYMBOL(inode_update_timestamps);
>   */
>  int generic_update_time(struct inode *inode, int flags)
>  {
> -	int updated = inode_update_timestamps(inode, flags);
> -	int dirty_flags = 0;
> -
> -	if (!updated)
> -		return 0;
> -
> -	if (updated & (S_ATIME|S_MTIME|S_CTIME))
> -		dirty_flags = inode->i_sb->s_flags & SB_LAZYTIME ? I_DIRTY_TIME : I_DIRTY_SYNC;
> -	if (updated & S_VERSION)
> -		dirty_flags |= I_DIRTY_SYNC;
> -	__mark_inode_dirty(inode, dirty_flags);
> +	flags = inode_update_timestamps(inode, flags);
> +	if (flags)
> +		mark_inode_dirty_time(inode, flags);
>  	return 0;
>  }
>  EXPORT_SYMBOL(generic_update_time);
> diff --git a/include/linux/fs.h b/include/linux/fs.h
> index c1077ae7c6b2..5c762d80b8a8 100644
> --- a/include/linux/fs.h
> +++ b/include/linux/fs.h
> @@ -2608,7 +2608,8 @@ static inline void kiocb_clone(struct kiocb *kiocb, struct kiocb *kiocb_src,
>  	};
>  }
>  
> -extern void __mark_inode_dirty(struct inode *, int);
> +void mark_inode_dirty_time(struct inode *inode, unsigned int flags);
> +void __mark_inode_dirty(struct inode *inode, int flags);
>  static inline void mark_inode_dirty(struct inode *inode)
>  {
>  	__mark_inode_dirty(inode, I_DIRTY);
> -- 
> 2.47.3
> 
-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR