Re: [PATCH 07/10] xfs: mount-api - add xfs_fc_free()

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On Mon, 2019-06-24 at 10:56 -0700, Darrick J. Wong wrote:
> On Mon, Jun 24, 2019 at 10:59:02AM +0800, Ian Kent wrote:
> > Add the fs_context_operations method .free that performs fs
> > context cleanup on context release.
> > 
> > Signed-off-by: Ian Kent <raven@xxxxxxxxxx>
> > ---
> >  fs/xfs/xfs_super.c |   23 +++++++++++++++++++++++
> >  1 file changed, 23 insertions(+)
> > 
> > diff --git a/fs/xfs/xfs_super.c b/fs/xfs/xfs_super.c
> > index 7326b21b32d1..0a771e1390e7 100644
> > --- a/fs/xfs/xfs_super.c
> > +++ b/fs/xfs/xfs_super.c
> > @@ -2413,10 +2413,33 @@ static const struct super_operations
> > xfs_super_operations = {
> >  	.free_cached_objects	= xfs_fs_free_cached_objects,
> >  };
> >  
> > +static void xfs_fc_free(struct fs_context *fc)
> > +{
> > +	struct xfs_fs_context	*ctx = fc->fs_private;
> > +	struct xfs_mount	*mp = fc->s_fs_info;
> > +
> > +	if (mp) {
> > +		/*
> > +		 * If an error occurs before ownership the xfs_mount
> > +		 * info struct is passed to xfs by the VFS (by assigning
> > +		 * it to sb->s_fs_info and clearing the corresponding
> > +		 * fs_context field, done before calling fill super via
> > +		 * .get_tree()) there may be some strings to cleanup.
> > +		 */
> > +		if (mp->m_logname)
> > +			kfree(mp->m_logname);
> 
> Doesn't kfree handle null parameters gracefully?

It does, old habits die hard, will fix, ;)

> 
> --D
> 
> > +		if (mp->m_rtname)
> > +			kfree(mp->m_rtname);
> > +		kfree(mp);
> > +	}
> > +	kfree(ctx);
> > +}
> > +
> >  static const struct fs_context_operations xfs_context_ops = {
> >  	.parse_param = xfs_parse_param,
> >  	.get_tree    = xfs_get_tree,
> >  	.reconfigure = xfs_reconfigure,
> > +	.free	     = xfs_fc_free,
> >  };
> >  
> >  static struct file_system_type xfs_fs_type = {
> > 




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