[PATCH 08/14] fs: exit early in generic_update_time when there is no work

[Jan Kara]

On Fri 14-11-25 07:26:11, Christoph Hellwig wrote:
> Exit early if not attributes are to be updated, to avoid a spurious call
		^^ no

> to __mark_inode_dirty which can turn into a fairly expensive no-op due to
> the extra checks and locking.
> 
> Signed-off-by: Christoph Hellwig <hch at lst.de>

Looks good. Feel free to add:

Reviewed-by: Jan Kara <jack at suse.cz>

								Honza

> ---
>  fs/inode.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/fs/inode.c b/fs/inode.c
> index 74e672dd90aa..57c458ee548d 100644
> --- a/fs/inode.c
> +++ b/fs/inode.c
> @@ -2098,6 +2098,9 @@ 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)
> -- 
> 2.47.3
> 
-- 
Jan Kara <jack at suse.com>
SUSE Labs, CR