From: Christoph Hellwig <hch@lst.de>
To: Andreas Gruenbacher <agruenba@redhat.com>
Cc: Christoph Hellwig <hch@lst.de>,
"K.V, Aneesh" <aneesh.kumar@linux.vnet.ibm.com>,
cluster-devel <cluster-devel@redhat.com>,
linux-fsdevel <linux-fsdevel@vger.kernel.org>
Subject: Re: gfs2 iomap: BUG_ON(buffer_unmapped) in submit_bh_wbc
Date: Thu, 24 May 2018 20:13:33 +0200 [thread overview]
Message-ID: <20180524181333.GA24254@lst.de> (raw)
In-Reply-To: <CAHc6FU5a5E9K_AizwWkoPjb4cCWzqKspjc9YDVOzpCxcsDnKeA@mail.gmail.com>
On Thu, May 24, 2018 at 08:05:03PM +0200, Andreas Gruenbacher wrote:
> Approach (1) is quite trivial:
>
> --- a/fs/buffer.c
> +++ b/fs/buffer.c
> @@ -1908,7 +1908,7 @@ iomap_to_bh(struct inode *inode, sector_t,
> struct buffer_head *bh,
> set_buffer_unwritten(bh);
> /* FALLTHRU */
> case IOMAP_MAPPED:
> - if (offset >= i_size_read(inode))
> + if ((iomap->flags & IOMAP_F_NEW) || offset >=
> i_size_read(inode))
> set_buffer_new(bh);
> bh->b_blocknr = (iomap->addr + offset - iomap->offset) >>
> inode->i_blkbits;
>
This is the right thing to do. We just didn't need to do it for XFS
as we'll never allocate normal blocks in write_begin.
You'll probably need similar tweaks in my new iomap write code, which
you're hopefully lookin into as well.
next prev parent reply other threads:[~2018-05-24 18:07 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-05-24 18:05 gfs2 iomap: BUG_ON(buffer_unmapped) in submit_bh_wbc Andreas Gruenbacher
2018-05-24 18:13 ` Christoph Hellwig [this message]
2018-05-24 18:25 ` Andreas Gruenbacher
2018-05-25 12:24 ` Christoph Hellwig
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