linux-kernel - [083/116] fs/partition/msdos: fix unusable extended partition for

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Message-Id: <20100330225653.028499392@linux.site>
Date:	Tue, 30 Mar 2010 15:56:01 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>,
	Daniel Taylor <Daniel.Taylor@....com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Greg Kroah-Hartman <gregkh@...e.de>
Subject: [083/116] fs/partition/msdos: fix unusable extended partition for > 512B sector

2.6.32-stable review patch.  If anyone has any objections, please let us know.

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

From: OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>

commit 8e0cc811e0f8029a7225372fb0951fab102c012f upstream.

Smaller size than a minimum blocksize can't be used, after all it's
handled like 0 size.

For extended partition itself, this makes sure to use bigger size than one
logical sector size at least.

Signed-off-by: OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
Cc: Daniel Taylor <Daniel.Taylor@....com>
Cc: "H. Peter Anvin" <hpa@...or.com>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 fs/partitions/msdos.c |   13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

--- a/fs/partitions/msdos.c
+++ b/fs/partitions/msdos.c
@@ -492,9 +492,16 @@ int msdos_partition(struct parsed_partit
 		if (!size)
 			continue;
 		if (is_extended_partition(p)) {
-			/* prevent someone doing mkfs or mkswap on an
-			   extended partition, but leave room for LILO */
-			put_partition(state, slot, start, size == 1 ? 1 : 2);
+			/*
+			 * prevent someone doing mkfs or mkswap on an
+			 * extended partition, but leave room for LILO
+			 * FIXME: this uses one logical sector for > 512b
+			 * sector, although it may not be enough/proper.
+			 */
+			sector_t n = 2;
+			n = min(size, max(sector_size, n));
+			put_partition(state, slot, start, n);
+
 			printk(" <");
 			parse_extended(state, bdev, start, size);
 			printk(" >");


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