linux-kernel - Re: [PATCH 07/14] fs: return a negative error from generic_update

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Message-ID: <6epbyvds7hmypmk6qfsmnvevbnt2msdbudknnn3ryx6szl5lwn@a2ydspgd2cd6>
Date: Mon, 24 Nov 2025 14:10:29 +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 07/14] fs: return a negative error from
 generic_update_time

On Fri 14-11-25 07:26:10, Christoph Hellwig wrote:
> Now that no caller looks at the updated flags, switch generic_update_time
> to the same calling convention as the ->update_time method and return 0
> or a negative errno.
> 
> This prepares for adding non-blocking timestamp updates that could return
> -EAGAIN.
> 
> Signed-off-by: Christoph Hellwig <hch@....de>

Looks good. Feel free to add:

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

								Honza

> ---
>  fs/gfs2/inode.c    | 3 +--
>  fs/inode.c         | 6 +++---
>  fs/ubifs/file.c    | 6 ++----
>  fs/xfs/xfs_iops.c  | 6 ++----
>  include/linux/fs.h | 2 +-
>  5 files changed, 9 insertions(+), 14 deletions(-)
> 
> diff --git a/fs/gfs2/inode.c b/fs/gfs2/inode.c
> index 8a7ed80d9f2d..601c14a3ac77 100644
> --- a/fs/gfs2/inode.c
> +++ b/fs/gfs2/inode.c
> @@ -2242,8 +2242,7 @@ static int gfs2_update_time(struct inode *inode, int flags)
>  		if (error)
>  			return error;
>  	}
> -	generic_update_time(inode, flags);
> -	return 0;
> +	return generic_update_time(inode, flags);
>  }
>  
>  static const struct inode_operations gfs2_file_iops = {
> diff --git a/fs/inode.c b/fs/inode.c
> index d3edcc5baec9..74e672dd90aa 100644
> --- a/fs/inode.c
> +++ b/fs/inode.c
> @@ -2091,7 +2091,7 @@ EXPORT_SYMBOL(inode_update_timestamps);
>   * or S_VERSION need to be updated we attempt to update all three of them. S_ATIME
>   * updates can be handled done independently of the rest.
>   *
> - * Returns a S_* mask indicating which fields were updated.
> + * Returns a negative error value on error, else 0.
>   */
>  int generic_update_time(struct inode *inode, int flags)
>  {
> @@ -2103,7 +2103,7 @@ int generic_update_time(struct inode *inode, int flags)
>  	if (updated & S_VERSION)
>  		dirty_flags |= I_DIRTY_SYNC;
>  	__mark_inode_dirty(inode, dirty_flags);
> -	return updated;
> +	return 0;
>  }
>  EXPORT_SYMBOL(generic_update_time);
>  
> @@ -2335,7 +2335,7 @@ static int file_update_time_flags(struct file *file, unsigned int flags)
>  	if (inode->i_op->update_time)
>  		ret = inode->i_op->update_time(inode, sync_mode);
>  	else
> -		generic_update_time(inode, sync_mode);
> +		ret = generic_update_time(inode, sync_mode);
>  	mnt_put_write_access_file(file);
>  	return ret;
>  }
> diff --git a/fs/ubifs/file.c b/fs/ubifs/file.c
> index ca41ce8208c4..3e119cb93ea9 100644
> --- a/fs/ubifs/file.c
> +++ b/fs/ubifs/file.c
> @@ -1379,10 +1379,8 @@ int ubifs_update_time(struct inode *inode, int flags)
>  			.dirtied_ino_d = ALIGN(ui->data_len, 8) };
>  	int err, release;
>  
> -	if (!IS_ENABLED(CONFIG_UBIFS_ATIME_SUPPORT)) {
> -		generic_update_time(inode, flags);
> -		return 0;
> -	}
> +	if (!IS_ENABLED(CONFIG_UBIFS_ATIME_SUPPORT))
> +		return generic_update_time(inode, flags);
>  
>  	err = ubifs_budget_space(c, &req);
>  	if (err)
> diff --git a/fs/xfs/xfs_iops.c b/fs/xfs/xfs_iops.c
> index caff0125faea..0ace5f790006 100644
> --- a/fs/xfs/xfs_iops.c
> +++ b/fs/xfs/xfs_iops.c
> @@ -1197,10 +1197,8 @@ xfs_vn_update_time(
>  
>  	if (inode->i_sb->s_flags & SB_LAZYTIME) {
>  		if (!((flags & S_VERSION) &&
> -		      inode_maybe_inc_iversion(inode, false))) {
> -			generic_update_time(inode, flags);
> -			return 0;
> -		}
> +		      inode_maybe_inc_iversion(inode, false)))
> +			return generic_update_time(inode, flags);
>  
>  		/* Capture the iversion update that just occurred */
>  		log_flags |= XFS_ILOG_CORE;
> diff --git a/include/linux/fs.h b/include/linux/fs.h
> index a09cebdb4881..c1077ae7c6b2 100644
> --- a/include/linux/fs.h
> +++ b/include/linux/fs.h
> @@ -2823,7 +2823,7 @@ extern int current_umask(void);
>  extern void ihold(struct inode * inode);
>  extern void iput(struct inode *);
>  int inode_update_timestamps(struct inode *inode, int flags);
> -int generic_update_time(struct inode *, int);
> +int generic_update_time(struct inode *inode, int flags);
>  
>  /* /sys/fs */
>  extern struct kobject *fs_kobj;
> -- 
> 2.47.3
> 
-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR