Hi Willy,
On Sat, Aug 17, 2019 at 07:20:55PM -0700, Matthew Wilcox wrote:
> On Sun, Aug 18, 2019 at 09:56:31AM +0800, Gao Xiang wrote:
> > @@ -82,8 +82,12 @@ static int erofs_readdir(struct file *f, struct dir_context *ctx)
> > unsigned int nameoff, maxsize;
> >
> > dentry_page = read_mapping_page(mapping, i, NULL);
> > - if (IS_ERR(dentry_page))
> > - continue;
> > + if (IS_ERR(dentry_page)) {
> > + errln("fail to readdir of logical block %u of nid %llu",
> > + i, EROFS_V(dir)->nid);
> > + err = PTR_ERR(dentry_page);
> > + break;
>
> I don't think you want to use the errno that came back from
> read_mapping_page() (which is, I think, always going to be -EIO).
> Rather you want -EFSCORRUPTED, at least if I understand the recent
> patches to ext2/ext4/f2fs/xfs/...
Thanks for your reply and noticing this. :)
Yes, as I talked with you about read_mapping_page() in a xfs related
topic earlier, I think I fully understand what returns here.
I actually had some concern about that before sending out this patch.
You know the status is
PG_uptodate is not set and PG_error is set here.
But we cannot know it is actually a disk read error or due to
corrupted images (due to lack of page flags or some status, and
I think it could be a waste of page structure space for such
corrupted image or disk error)...
And some people also like propagate errors from insiders...
(and they could argue about err = -EFSCORRUPTED as well..)
I'd like hear your suggestion about this after my words above?
still return -EFSCORRUPTED?
Thanks,
Gao Xiang
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