[Ocfs2-devel] [PATCH V3] Fix the nested PR lock calling issue in ACL

[Jiaju Zhang]

On Mon, Jul 26, 2010 at 08:08:27PM +0800, Wengang Wang wrote:
> On 10-07-26 18:36, Jiaju Zhang wrote:
> > Oh, this is a slight change of the patch I just posted, since the
> > original one may have wrongly processing of error return code. So
> > please review this one instead;)
> > 
> > Thanks a lot,
> > Jiaju
> > 
> > Signed-off-by: Jiaju Zhang <jjzhang at suse.de>
> > ---
> >  fs/ocfs2/acl.c |   20 ++++++++++++++++++--
> >  1 files changed, 18 insertions(+), 2 deletions(-)
> > 
> > diff --git a/fs/ocfs2/acl.c b/fs/ocfs2/acl.c
> > index da70229..28a25b8 100644
> > --- a/fs/ocfs2/acl.c
> > +++ b/fs/ocfs2/acl.c
> > @@ -290,12 +290,28 @@ static int ocfs2_set_acl(handle_t *handle,
> >  
> >  int ocfs2_check_acl(struct inode *inode, int mask)
> >  {
> > -	struct posix_acl *acl = ocfs2_get_acl(inode, ACL_TYPE_ACCESS);
> > +	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
> > +	struct buffer_head *di_bh = NULL;
> > +	struct posix_acl *acl;
> > +	int ret = -EAGAIN;
> > +
> > +	if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL))
> > +		return ret;
> > +
> > +	ret = ocfs2_read_inode_block(inode, &di_bh);
> > +	if (ret < 0) {
> > +		mlog_errno(ret);
> > +		return ret;
> > +	}
> > +
> > +	acl = ocfs2_get_acl_nolock(inode, ACL_TYPE_ACCESS, di_bh);
> > +
> > +	brelse(di_bh);
> >  
> >  	if (IS_ERR(acl))
> 
> Could you log this error? though it's not part of the fix.
> Otherwise, ack.

Hi Wengang, many thanks;)

Yes, I can add a log like

+               mlog_errno(PTR_ERR(acl));

But I'm wondering if we really need to add the log? Since there are
many places calling like
        if (IS_ERR(acl))
                return PTR_ERR(acl);
and some other filesystems such as ext3, ext4, btrfs didn't log this
error at this point as well.

Thanks,
Jiaju

> 
> regards,
> wengang.
> >  		return PTR_ERR(acl);
> >  	if (acl) {
> > -		int ret = posix_acl_permission(inode, acl, mask);
> > +		ret = posix_acl_permission(inode, acl, mask);
> >  		posix_acl_release(acl);
> >  		return ret;
> >  	}