linux-kernel - Re: [PATCH v4 16/19] fs: only set S_VERSION when updating times if necessary

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Date:   Tue, 2 Jan 2018 17:50:34 +0100
From:   Jan Kara <jack@...e.cz>
To:     Jeff Layton <jlayton@...nel.org>
Cc:     linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        viro@...iv.linux.org.uk, linux-nfs@...r.kernel.org,
        bfields@...ldses.org, neilb@...e.de, jack@...e.de,
        linux-ext4@...r.kernel.org, tytso@....edu,
        adilger.kernel@...ger.ca, linux-xfs@...r.kernel.org,
        darrick.wong@...cle.com, david@...morbit.com,
        linux-btrfs@...r.kernel.org, clm@...com, jbacik@...com,
        dsterba@...e.com, linux-integrity@...r.kernel.org,
        zohar@...ux.vnet.ibm.com, dmitry.kasatkin@...il.com,
        linux-afs@...ts.infradead.org, dhowells@...hat.com,
        jaltman@...istor.com
Subject: Re: [PATCH v4 16/19] fs: only set S_VERSION when updating times if
 necessary

On Fri 22-12-17 07:05:53, Jeff Layton wrote:
> From: Jeff Layton <jlayton@...hat.com>
> 
> We only really need to update i_version if someone has queried for it
> since we last incremented it. By doing that, we can avoid having to
> update the inode if the times haven't changed.
> 
> If the times have changed, then we go ahead and forcibly increment the
> counter, under the assumption that we'll be going to the storage
> anyway, and the increment itself is relatively cheap.
> 
> Signed-off-by: Jeff Layton <jlayton@...hat.com>
> ---
>  fs/inode.c | 10 +++++++---
>  1 file changed, 7 insertions(+), 3 deletions(-)
> 
> diff --git a/fs/inode.c b/fs/inode.c
> index 19e72f500f71..2fa920188759 100644
> --- a/fs/inode.c
> +++ b/fs/inode.c
> @@ -1635,17 +1635,21 @@ static int relatime_need_update(const struct path *path, struct inode *inode,
>  int generic_update_time(struct inode *inode, struct timespec *time, int flags)
>  {
>  	int iflags = I_DIRTY_TIME;
> +	bool dirty = false;
>  
>  	if (flags & S_ATIME)
>  		inode->i_atime = *time;
>  	if (flags & S_VERSION)
> -		inode_inc_iversion(inode);
> +		dirty |= inode_maybe_inc_iversion(inode, dirty);
>  	if (flags & S_CTIME)
>  		inode->i_ctime = *time;
>  	if (flags & S_MTIME)
>  		inode->i_mtime = *time;
> +	if ((flags & (S_ATIME | S_CTIME | S_MTIME)) &&
> +	    !(inode->i_sb->s_flags & SB_LAZYTIME))
> +		dirty = true;

When you pass 'dirty' to inode_maybe_inc_iversion(), it is always false.
Maybe this condition should be at the beginning of the function? Once you
fix that the patch looks good so you can add:

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


								Honza
-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR