linux-kernel - [PATCH 3.18 02/32] partitions/msdos: FreeBSD UFS2 file systems are not recognized

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Date:   Mon, 19 Jun 2017 23:20:46 +0800
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Richard Narron <comet.berkeley@...il.com>,
        Christoph Hellwig <hch@....de>, Jens Axboe <axboe@...com>
Subject: [PATCH 3.18 02/32] partitions/msdos: FreeBSD UFS2 file systems are not recognized

3.18-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Richard <richard@...zen.com>

commit 223220356d5ebc05ead9a8d697abb0c0a906fc81 upstream.

The code in block/partitions/msdos.c recognizes FreeBSD, OpenBSD
and NetBSD partitions and does a reasonable job picking out OpenBSD
and NetBSD UFS subpartitions.

But for FreeBSD the subpartitions are always "bad".

    Kernel: <bsd:bad subpartition - ignored

Though all 3 of these BSD systems use UFS as a file system, only
FreeBSD uses relative start addresses in the subpartition
declarations.

The following patch fixes this for FreeBSD partitions and leaves
the code for OpenBSD and NetBSD intact:

Signed-off-by: Richard Narron <comet.berkeley@...il.com>
Reviewed-by: Christoph Hellwig <hch@....de>
Signed-off-by: Jens Axboe <axboe@...com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 block/partitions/msdos.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/block/partitions/msdos.c
+++ b/block/partitions/msdos.c
@@ -300,6 +300,8 @@ static void parse_bsd(struct parsed_part
 			continue;
 		bsd_start = le32_to_cpu(p->p_offset);
 		bsd_size = le32_to_cpu(p->p_size);
+		if (memcmp(flavour, "bsd\0", 4) == 0)
+			bsd_start += offset;
 		if (offset == bsd_start && size == bsd_size)
 			/* full parent partition, we have it already */
 			continue;