On Mon, Jan 02, 2017 at 04:58:03PM +0100, Jan Kara wrote:
> On Sun 25-12-16 19:01:03, Chandan Rajendra wrote:
> > The first block to be cleaned may start at a non-zero page offset. In
> > such a scenario clean_bdev_aliases() will end up cleaning blocks that
> > do not fall in the range of blocks to be cleaned. This commit fixes the
> > issue by skipping blocks that do not fall in valid block range.
> >
> > Signed-off-by: Chandan Rajendra <chandan@xxxxxxxxxxxxxxxxxx>
>
> Ah, very good catch! How did you spot this?
I failed to notice this patch, and I came up with a same patch today
myself, and I'm still testing it.
I found this by xfstests, many tests (tens of tests) failed fsck after
test when testing extN if blocksize < pagesize. E.g. generic/013 could
reproduce the fs corruption quite reliablely for me.
Reviewed-by: Eryu Guan <eguan@xxxxxxxxxx>
>
> The patch looks good. You can add:
>
> Reviewed-by: Jan Kara <jack@xxxxxxx>
>
> Jens, please merge this fix quickly as we may end up discarding changes to
> innocent metadata blocks due to this... Thanks!
>
> Honza
> > ---
> > fs/buffer.c | 2 +-
> > 1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/fs/buffer.c b/fs/buffer.c
> > index 1df2bd5..28484b3 100644
> > --- a/fs/buffer.c
> > +++ b/fs/buffer.c
> > @@ -1660,7 +1660,7 @@ void clean_bdev_aliases(struct block_device *bdev, sector_t block, sector_t len)
> > head = page_buffers(page);
> > bh = head;
> > do {
> > - if (!buffer_mapped(bh))
> > + if (!buffer_mapped(bh) || (bh->b_blocknr < block))
> > goto next;
> > if (bh->b_blocknr >= block + len)
> > break;
> > --
> > 2.5.5
> >
> --
> Jan Kara <jack@xxxxxxxx>
> SUSE Labs, CR
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