[PATCH 4.4 02/46] partitions/msdos: FreeBSD UFS2 file systems are not recognized

From	Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Newsgroups	linux.kernel
Subject	[PATCH 4.4 02/46] partitions/msdos: FreeBSD UFS2 file systems are not recognized
Date	2017-06-15 20:00 +0200
Message-ID	<tSHdL-5vC-5@gated-at.bofh.it> (permalink)
References	<tSHdL-5vC-7@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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

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

From: Richard <richard@aaazen.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@gmail.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@fb.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.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;

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[PATCH 4.4 02/46] partitions/msdos: FreeBSD UFS2 file systems are not recognized Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-06-15 20:00 +0200

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