Re: [PATCH v3 RESEND] staging: erofs: fix an error handling in erofs_readdir()

[Gao Xiang]

On Sun, Aug 18, 2019 at 05:33:14AM -0700, Matthew Wilcox wrote:
> On Sun, Aug 18, 2019 at 11:21:11AM +0800, Gao Xiang wrote:
> > +		if (dentry_page == ERR_PTR(-ENOMEM)) {
> > +			errln("no memory to readdir of logical block %u of nid %llu",
> > +			      i, EROFS_V(dir)->nid);
> 
> I don't think you need the error message.  If we get a memory allocation
> failure, there's already going to be a lot of spew in the logs from the
> mm system.  And if we do fail to allocate memory, we don't need to know
> the logical block number or the nid -- it has nothiing to do with those;
> the system simply ran out of memory.

OK, I agree with you. There is a messy of messages when
memory allocation fail.

Since I don't really care apart from crashing or hanging
the kernel, I will resend the patch to make you and Chao
happy... :)

Thanks,
Gao Xiang

> 
> > +			err = -ENOMEM;
> > +			break;
> > +		} else if (IS_ERR(dentry_page)) {
> > +			errln("fail to readdir of logical block %u of nid %llu",
> > +			      i, EROFS_V(dir)->nid);
> > +			err = -EFSCORRUPTED;
> > +			break;
> > +		}
> >  
> >  		de = (struct erofs_dirent *)kmap(dentry_page);
> >  
> > -- 
> > 2.17.1
> >